android.database.sqlite.SQLiteDatabase Maven / Gradle / Ivy
/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
** Modified to support SQLite extensions by the SQLite developers:
** [email protected].
*/
package android.database.sqlite;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.DatabaseErrorHandler;
import android.database.DatabaseUtils;
import android.database.DefaultDatabaseErrorHandler;
import android.database.SQLException;
import android.database.sqlite.SQLiteDebug.DbStats;
import android.os.CancellationSignal;
import android.os.Looper;
import android.os.OperationCanceledException;
import android.text.TextUtils;
import android.util.EventLog;
import android.util.Log;
import android.util.Pair;
import android.util.Printer;
import android.database.sqlite.CloseGuard;
import java.io.File;
import java.io.FileFilter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.WeakHashMap;
/**
* Exposes methods to manage a SQLite database.
*
*
* SQLiteDatabase has methods to create, delete, execute SQL commands, and
* perform other common database management tasks.
*
* See the Notepad sample application in the SDK for an example of creating
* and managing a database.
*
* Database names must be unique within an application, not across all applications.
*
*
* Localized Collation - ORDER BY
*
* In addition to SQLite's default BINARY collator, Android supplies
* two more, LOCALIZED, which changes with the system's current locale,
* and UNICODE, which is the Unicode Collation Algorithm and not tailored
* to the current locale.
*
*/
public final class SQLiteDatabase extends SQLiteClosable {
private static final String TAG = "SQLiteDatabase";
private static final int EVENT_DB_CORRUPT = 75004;
// Stores reference to all databases opened in the current process.
// (The referent Object is not used at this time.)
// INVARIANT: Guarded by sActiveDatabases.
private static WeakHashMap sActiveDatabases =
new WeakHashMap();
// Thread-local for database sessions that belong to this database.
// Each thread has its own database session.
// INVARIANT: Immutable.
private final ThreadLocal mThreadSession = new ThreadLocal() {
@Override
protected SQLiteSession initialValue() {
return createSession();
}
};
// The optional factory to use when creating new Cursors. May be null.
// INVARIANT: Immutable.
private final CursorFactory mCursorFactory;
// Error handler to be used when SQLite returns corruption errors.
// INVARIANT: Immutable.
private final DatabaseErrorHandler mErrorHandler;
// Shared database state lock.
// This lock guards all of the shared state of the database, such as its
// configuration, whether it is open or closed, and so on. This lock should
// be held for as little time as possible.
//
// The lock MUST NOT be held while attempting to acquire database connections or
// while executing SQL statements on behalf of the client as it can lead to deadlock.
//
// It is ok to hold the lock while reconfiguring the connection pool or dumping
// statistics because those operations are non-reentrant and do not try to acquire
// connections that might be held by other threads.
//
// Basic rule: grab the lock, access or modify global state, release the lock, then
// do the required SQL work.
private final Object mLock = new Object();
// Warns if the database is finalized without being closed properly.
// INVARIANT: Guarded by mLock.
private final CloseGuard mCloseGuardLocked = CloseGuard.get();
// The database configuration.
// INVARIANT: Guarded by mLock.
private final SQLiteDatabaseConfiguration mConfigurationLocked;
// The connection pool for the database, null when closed.
// The pool itself is thread-safe, but the reference to it can only be acquired
// when the lock is held.
// INVARIANT: Guarded by mLock.
private SQLiteConnectionPool mConnectionPoolLocked;
// True if the database has attached databases.
// INVARIANT: Guarded by mLock.
private boolean mHasAttachedDbsLocked;
/**
* When a constraint violation occurs, an immediate ROLLBACK occurs,
* thus ending the current transaction, and the command aborts with a
* return code of SQLITE_CONSTRAINT. If no transaction is active
* (other than the implied transaction that is created on every command)
* then this algorithm works the same as ABORT.
*/
public static final int CONFLICT_ROLLBACK = 1;
/**
* When a constraint violation occurs,no ROLLBACK is executed
* so changes from prior commands within the same transaction
* are preserved. This is the default behavior.
*/
public static final int CONFLICT_ABORT = 2;
/**
* When a constraint violation occurs, the command aborts with a return
* code SQLITE_CONSTRAINT. But any changes to the database that
* the command made prior to encountering the constraint violation
* are preserved and are not backed out.
*/
public static final int CONFLICT_FAIL = 3;
/**
* When a constraint violation occurs, the one row that contains
* the constraint violation is not inserted or changed.
* But the command continues executing normally. Other rows before and
* after the row that contained the constraint violation continue to be
* inserted or updated normally. No error is returned.
*/
public static final int CONFLICT_IGNORE = 4;
/**
* When a UNIQUE constraint violation occurs, the pre-existing rows that
* are causing the constraint violation are removed prior to inserting
* or updating the current row. Thus the insert or update always occurs.
* The command continues executing normally. No error is returned.
* If a NOT NULL constraint violation occurs, the NULL value is replaced
* by the default value for that column. If the column has no default
* value, then the ABORT algorithm is used. If a CHECK constraint
* violation occurs then the IGNORE algorithm is used. When this conflict
* resolution strategy deletes rows in order to satisfy a constraint,
* it does not invoke delete triggers on those rows.
* This behavior might change in a future release.
*/
public static final int CONFLICT_REPLACE = 5;
/**
* Use the following when no conflict action is specified.
*/
public static final int CONFLICT_NONE = 0;
private static final String[] CONFLICT_VALUES = new String[]
{"", " OR ROLLBACK ", " OR ABORT ", " OR FAIL ", " OR IGNORE ", " OR REPLACE "};
/**
* Maximum Length Of A LIKE Or GLOB Pattern
* The pattern matching algorithm used in the default LIKE and GLOB implementation
* of SQLite can exhibit O(N^2) performance (where N is the number of characters in
* the pattern) for certain pathological cases. To avoid denial-of-service attacks
* the length of the LIKE or GLOB pattern is limited to SQLITE_MAX_LIKE_PATTERN_LENGTH bytes.
* The default value of this limit is 50000. A modern workstation can evaluate
* even a pathological LIKE or GLOB pattern of 50000 bytes relatively quickly.
* The denial of service problem only comes into play when the pattern length gets
* into millions of bytes. Nevertheless, since most useful LIKE or GLOB patterns
* are at most a few dozen bytes in length, paranoid application developers may
* want to reduce this parameter to something in the range of a few hundred
* if they know that external users are able to generate arbitrary patterns.
*/
public static final int SQLITE_MAX_LIKE_PATTERN_LENGTH = 50000;
/**
* Open flag: Flag for {@link #openDatabase} to open the database for reading and writing.
* If the disk is full, this may fail even before you actually write anything.
*
* {@more} Note that the value of this flag is 0, so it is the default.
*/
public static final int OPEN_READWRITE = 0x00000000; // update native code if changing
/**
* Open flag: Flag for {@link #openDatabase} to open the database for reading only.
* This is the only reliable way to open a database if the disk may be full.
*/
public static final int OPEN_READONLY = 0x00000001; // update native code if changing
private static final int OPEN_READ_MASK = 0x00000001; // update native code if changing
/**
* Open flag: Flag for {@link #openDatabase} to open the database without support for
* localized collators.
*
* {@more} This causes the collator LOCALIZED not to be created.
* You must be consistent when using this flag to use the setting the database was
* created with. If this is set, {@link #setLocale} will do nothing.
*/
public static final int NO_LOCALIZED_COLLATORS = 0x00000010; // update native code if changing
/**
* Open flag: Flag for {@link #openDatabase} to create the database file if it does not
* already exist.
*/
public static final int CREATE_IF_NECESSARY = 0x10000000; // update native code if changing
/**
* Open flag: Flag for {@link #openDatabase} to open the database file with
* write-ahead logging enabled by default. Using this flag is more efficient
* than calling {@link #enableWriteAheadLogging}.
*
* Write-ahead logging cannot be used with read-only databases so the value of
* this flag is ignored if the database is opened read-only.
*
* @see #enableWriteAheadLogging
*/
public static final int ENABLE_WRITE_AHEAD_LOGGING = 0x20000000;
/**
* Absolute max value that can be set by {@link #setMaxSqlCacheSize(int)}.
*
* Each prepared-statement is between 1K - 6K, depending on the complexity of the
* SQL statement & schema. A large SQL cache may use a significant amount of memory.
*/
public static final int MAX_SQL_CACHE_SIZE = 100;
private SQLiteDatabase(String path, int openFlags, CursorFactory cursorFactory,
DatabaseErrorHandler errorHandler) {
mCursorFactory = cursorFactory;
mErrorHandler = errorHandler != null ? errorHandler : new DefaultDatabaseErrorHandler();
mConfigurationLocked = new SQLiteDatabaseConfiguration(path, openFlags);
}
@Override
protected void finalize() throws Throwable {
try {
dispose(true);
} finally {
super.finalize();
}
}
@Override
protected void onAllReferencesReleased() {
dispose(false);
}
private void dispose(boolean finalized) {
final SQLiteConnectionPool pool;
synchronized (mLock) {
if (mCloseGuardLocked != null) {
if (finalized) {
mCloseGuardLocked.warnIfOpen();
}
mCloseGuardLocked.close();
}
pool = mConnectionPoolLocked;
mConnectionPoolLocked = null;
}
if (!finalized) {
synchronized (sActiveDatabases) {
sActiveDatabases.remove(this);
}
if (pool != null) {
pool.close();
}
}
}
/**
* Attempts to release memory that SQLite holds but does not require to
* operate properly. Typically this memory will come from the page cache.
*
* @return the number of bytes actually released
*/
public static int releaseMemory() {
return SQLiteGlobal.releaseMemory();
}
/**
* Control whether or not the SQLiteDatabase is made thread-safe by using locks
* around critical sections. This is pretty expensive, so if you know that your
* DB will only be used by a single thread then you should set this to false.
* The default is true.
* @param lockingEnabled set to true to enable locks, false otherwise
*
* @deprecated This method now does nothing. Do not use.
*/
@Deprecated
public void setLockingEnabled(boolean lockingEnabled) {
}
/**
* Gets a label to use when describing the database in log messages.
* @return The label.
*/
String getLabel() {
synchronized (mLock) {
return mConfigurationLocked.label;
}
}
/**
* Sends a corruption message to the database error handler.
*/
void onCorruption() {
EventLog.writeEvent(EVENT_DB_CORRUPT, getLabel());
mErrorHandler.onCorruption(this);
}
/**
* Gets the {@link SQLiteSession} that belongs to this thread for this database.
* Once a thread has obtained a session, it will continue to obtain the same
* session even after the database has been closed (although the session will not
* be usable). However, a thread that does not already have a session cannot
* obtain one after the database has been closed.
*
* The idea is that threads that have active connections to the database may still
* have work to complete even after the call to {@link #close}. Active database
* connections are not actually disposed until they are released by the threads
* that own them.
*
* @return The session, never null.
*
* @throws IllegalStateException if the thread does not yet have a session and
* the database is not open.
*/
SQLiteSession getThreadSession() {
return mThreadSession.get(); // initialValue() throws if database closed
}
SQLiteSession createSession() {
final SQLiteConnectionPool pool;
synchronized (mLock) {
throwIfNotOpenLocked();
pool = mConnectionPoolLocked;
}
return new SQLiteSession(pool);
}
/**
* Gets default connection flags that are appropriate for this thread, taking into
* account whether the thread is acting on behalf of the UI.
*
* @param readOnly True if the connection should be read-only.
* @return The connection flags.
*/
int getThreadDefaultConnectionFlags(boolean readOnly) {
int flags = readOnly ? SQLiteConnectionPool.CONNECTION_FLAG_READ_ONLY :
SQLiteConnectionPool.CONNECTION_FLAG_PRIMARY_CONNECTION_AFFINITY;
if (isMainThread()) {
flags |= SQLiteConnectionPool.CONNECTION_FLAG_INTERACTIVE;
}
return flags;
}
private static boolean isMainThread() {
// FIXME: There should be a better way to do this.
// Would also be nice to have something that would work across Binder calls.
Looper looper = Looper.myLooper();
return looper != null && looper == Looper.getMainLooper();
}
/**
* Begins a transaction in EXCLUSIVE mode.
*
* Transactions can be nested.
* When the outer transaction is ended all of
* the work done in that transaction and all of the nested transactions will be committed or
* rolled back. The changes will be rolled back if any transaction is ended without being
* marked as clean (by calling setTransactionSuccessful). Otherwise they will be committed.
*
* Here is the standard idiom for transactions:
*
*
* db.beginTransaction();
* try {
* ...
* db.setTransactionSuccessful();
* } finally {
* db.endTransaction();
* }
*
*/
public void beginTransaction() {
beginTransaction(null /* transactionStatusCallback */, true);
}
/**
* Begins a transaction in IMMEDIATE mode. Transactions can be nested. When
* the outer transaction is ended all of the work done in that transaction
* and all of the nested transactions will be committed or rolled back. The
* changes will be rolled back if any transaction is ended without being
* marked as clean (by calling setTransactionSuccessful). Otherwise they
* will be committed.
*
* Here is the standard idiom for transactions:
*
*
* db.beginTransactionNonExclusive();
* try {
* ...
* db.setTransactionSuccessful();
* } finally {
* db.endTransaction();
* }
*
*/
public void beginTransactionNonExclusive() {
beginTransaction(null /* transactionStatusCallback */, false);
}
/**
* Begins a transaction in EXCLUSIVE mode.
*
* Transactions can be nested.
* When the outer transaction is ended all of
* the work done in that transaction and all of the nested transactions will be committed or
* rolled back. The changes will be rolled back if any transaction is ended without being
* marked as clean (by calling setTransactionSuccessful). Otherwise they will be committed.
*
* Here is the standard idiom for transactions:
*
*
* db.beginTransactionWithListener(listener);
* try {
* ...
* db.setTransactionSuccessful();
* } finally {
* db.endTransaction();
* }
*
*
* @param transactionListener listener that should be notified when the transaction begins,
* commits, or is rolled back, either explicitly or by a call to
* {@link #yieldIfContendedSafely}.
*/
public void beginTransactionWithListener(SQLiteTransactionListener transactionListener) {
beginTransaction(transactionListener, true);
}
/**
* Begins a transaction in IMMEDIATE mode. Transactions can be nested. When
* the outer transaction is ended all of the work done in that transaction
* and all of the nested transactions will be committed or rolled back. The
* changes will be rolled back if any transaction is ended without being
* marked as clean (by calling setTransactionSuccessful). Otherwise they
* will be committed.
*
* Here is the standard idiom for transactions:
*
*
* db.beginTransactionWithListenerNonExclusive(listener);
* try {
* ...
* db.setTransactionSuccessful();
* } finally {
* db.endTransaction();
* }
*
*
* @param transactionListener listener that should be notified when the
* transaction begins, commits, or is rolled back, either
* explicitly or by a call to {@link #yieldIfContendedSafely}.
*/
public void beginTransactionWithListenerNonExclusive(
SQLiteTransactionListener transactionListener) {
beginTransaction(transactionListener, false);
}
private void beginTransaction(SQLiteTransactionListener transactionListener,
boolean exclusive) {
acquireReference();
try {
getThreadSession().beginTransaction(
exclusive ? SQLiteSession.TRANSACTION_MODE_EXCLUSIVE :
SQLiteSession.TRANSACTION_MODE_IMMEDIATE,
transactionListener,
getThreadDefaultConnectionFlags(false /*readOnly*/), null);
} finally {
releaseReference();
}
}
/**
* End a transaction. See beginTransaction for notes about how to use this and when transactions
* are committed and rolled back.
*/
public void endTransaction() {
acquireReference();
try {
getThreadSession().endTransaction(null);
} finally {
releaseReference();
}
}
/**
* Marks the current transaction as successful. Do not do any more database work between
* calling this and calling endTransaction. Do as little non-database work as possible in that
* situation too. If any errors are encountered between this and endTransaction the transaction
* will still be committed.
*
* @throws IllegalStateException if the current thread is not in a transaction or the
* transaction is already marked as successful.
*/
public void setTransactionSuccessful() {
acquireReference();
try {
getThreadSession().setTransactionSuccessful();
} finally {
releaseReference();
}
}
/**
* Returns true if the current thread has a transaction pending.
*
* @return True if the current thread is in a transaction.
*/
public boolean inTransaction() {
acquireReference();
try {
return getThreadSession().hasTransaction();
} finally {
releaseReference();
}
}
/**
* Returns true if the current thread is holding an active connection to the database.
*
* The name of this method comes from a time when having an active connection
* to the database meant that the thread was holding an actual lock on the
* database. Nowadays, there is no longer a true "database lock" although threads
* may block if they cannot acquire a database connection to perform a
* particular operation.
*
*
* @return True if the current thread is holding an active connection to the database.
*/
public boolean isDbLockedByCurrentThread() {
acquireReference();
try {
return getThreadSession().hasConnection();
} finally {
releaseReference();
}
}
/**
* Always returns false.
*
* There is no longer the concept of a database lock, so this method always returns false.
*
*
* @return False.
* @deprecated Always returns false. Do not use this method.
*/
@Deprecated
public boolean isDbLockedByOtherThreads() {
return false;
}
/**
* Temporarily end the transaction to let other threads run. The transaction is assumed to be
* successful so far. Do not call setTransactionSuccessful before calling this. When this
* returns a new transaction will have been created but not marked as successful.
* @return true if the transaction was yielded
* @deprecated if the db is locked more than once (becuase of nested transactions) then the lock
* will not be yielded. Use yieldIfContendedSafely instead.
*/
@Deprecated
public boolean yieldIfContended() {
return yieldIfContendedHelper(false /* do not check yielding */,
-1 /* sleepAfterYieldDelay */);
}
/**
* Temporarily end the transaction to let other threads run. The transaction is assumed to be
* successful so far. Do not call setTransactionSuccessful before calling this. When this
* returns a new transaction will have been created but not marked as successful. This assumes
* that there are no nested transactions (beginTransaction has only been called once) and will
* throw an exception if that is not the case.
* @return true if the transaction was yielded
*/
public boolean yieldIfContendedSafely() {
return yieldIfContendedHelper(true /* check yielding */, -1 /* sleepAfterYieldDelay*/);
}
/**
* Temporarily end the transaction to let other threads run. The transaction is assumed to be
* successful so far. Do not call setTransactionSuccessful before calling this. When this
* returns a new transaction will have been created but not marked as successful. This assumes
* that there are no nested transactions (beginTransaction has only been called once) and will
* throw an exception if that is not the case.
* @param sleepAfterYieldDelay if > 0, sleep this long before starting a new transaction if
* the lock was actually yielded. This will allow other background threads to make some
* more progress than they would if we started the transaction immediately.
* @return true if the transaction was yielded
*/
public boolean yieldIfContendedSafely(long sleepAfterYieldDelay) {
return yieldIfContendedHelper(true /* check yielding */, sleepAfterYieldDelay);
}
private boolean yieldIfContendedHelper(boolean throwIfUnsafe, long sleepAfterYieldDelay) {
acquireReference();
try {
return getThreadSession().yieldTransaction(sleepAfterYieldDelay, throwIfUnsafe, null);
} finally {
releaseReference();
}
}
/**
* Deprecated.
* @deprecated This method no longer serves any useful purpose and has been deprecated.
*/
@Deprecated
public Map getSyncedTables() {
return new HashMap(0);
}
/**
* Open the database according to the flags {@link #OPEN_READWRITE}
* {@link #OPEN_READONLY} {@link #CREATE_IF_NECESSARY} and/or {@link #NO_LOCALIZED_COLLATORS}.
*
* Sets the locale of the database to the the system's current locale.
* Call {@link #setLocale} if you would like something else.
*
* @param path to database file to open and/or create
* @param factory an optional factory class that is called to instantiate a
* cursor when query is called, or null for default
* @param flags to control database access mode
* @return the newly opened database
* @throws SQLiteException if the database cannot be opened
*/
public static SQLiteDatabase openDatabase(String path, CursorFactory factory, int flags) {
return openDatabase(path, factory, flags, null);
}
/**
* Open the database according to the flags {@link #OPEN_READWRITE}
* {@link #OPEN_READONLY} {@link #CREATE_IF_NECESSARY} and/or {@link #NO_LOCALIZED_COLLATORS}.
*
* Sets the locale of the database to the the system's current locale.
* Call {@link #setLocale} if you would like something else.
*
* Accepts input param: a concrete instance of {@link DatabaseErrorHandler} to be
* used to handle corruption when sqlite reports database corruption.
*
* @param path to database file to open and/or create
* @param factory an optional factory class that is called to instantiate a
* cursor when query is called, or null for default
* @param flags to control database access mode
* @param errorHandler the {@link DatabaseErrorHandler} obj to be used to handle corruption
* when sqlite reports database corruption
* @return the newly opened database
* @throws SQLiteException if the database cannot be opened
*/
public static SQLiteDatabase openDatabase(String path, CursorFactory factory, int flags,
DatabaseErrorHandler errorHandler) {
SQLiteDatabase db = new SQLiteDatabase(path, flags, factory, errorHandler);
db.open();
return db;
}
/**
* Equivalent to openDatabase(file.getPath(), factory, CREATE_IF_NECESSARY).
*/
public static SQLiteDatabase openOrCreateDatabase(File file, CursorFactory factory) {
return openOrCreateDatabase(file.getPath(), factory);
}
/**
* Equivalent to openDatabase(path, factory, CREATE_IF_NECESSARY).
*/
public static SQLiteDatabase openOrCreateDatabase(String path, CursorFactory factory) {
return openDatabase(path, factory, CREATE_IF_NECESSARY, null);
}
/**
* Equivalent to openDatabase(path, factory, CREATE_IF_NECESSARY, errorHandler).
*/
public static SQLiteDatabase openOrCreateDatabase(String path, CursorFactory factory,
DatabaseErrorHandler errorHandler) {
return openDatabase(path, factory, CREATE_IF_NECESSARY, errorHandler);
}
/**
* Deletes a database including its journal file and other auxiliary files
* that may have been created by the database engine.
*
* @param file The database file path.
* @return True if the database was successfully deleted.
*/
public static boolean deleteDatabase(File file) {
if (file == null) {
throw new IllegalArgumentException("file must not be null");
}
boolean deleted = false;
deleted |= file.delete();
deleted |= new File(file.getPath() + "-journal").delete();
deleted |= new File(file.getPath() + "-shm").delete();
deleted |= new File(file.getPath() + "-wal").delete();
File dir = file.getParentFile();
if (dir != null) {
final String prefix = file.getName() + "-mj";
File[] files = dir.listFiles(new FileFilter() {
@Override
public boolean accept(File candidate) {
return candidate.getName().startsWith(prefix);
}
});
if (files != null) {
for (File masterJournal : files) {
deleted |= masterJournal.delete();
}
}
}
return deleted;
}
/**
* Reopens the database in read-write mode.
* If the database is already read-write, does nothing.
*
* @throws SQLiteException if the database could not be reopened as requested, in which
* case it remains open in read only mode.
* @throws IllegalStateException if the database is not open.
*
* @see #isReadOnly()
* @hide
*/
public void reopenReadWrite() {
synchronized (mLock) {
throwIfNotOpenLocked();
if (!isReadOnlyLocked()) {
return; // nothing to do
}
// Reopen the database in read-write mode.
final int oldOpenFlags = mConfigurationLocked.openFlags;
mConfigurationLocked.openFlags = (mConfigurationLocked.openFlags & ~OPEN_READ_MASK)
| OPEN_READWRITE;
try {
mConnectionPoolLocked.reconfigure(mConfigurationLocked);
} catch (RuntimeException ex) {
mConfigurationLocked.openFlags = oldOpenFlags;
throw ex;
}
}
}
private void open() {
try {
try {
openInner();
} catch (SQLiteDatabaseCorruptException ex) {
onCorruption();
openInner();
}
} catch (SQLiteException ex) {
Log.e(TAG, "Failed to open database '" + getLabel() + "'.", ex);
close();
throw ex;
}
}
private void openInner() {
synchronized (mLock) {
assert mConnectionPoolLocked == null;
mConnectionPoolLocked = SQLiteConnectionPool.open(mConfigurationLocked);
mCloseGuardLocked.open("close");
}
synchronized (sActiveDatabases) {
sActiveDatabases.put(this, null);
}
}
/**
* Create a memory backed SQLite database. Its contents will be destroyed
* when the database is closed.
*
* Sets the locale of the database to the the system's current locale.
* Call {@link #setLocale} if you would like something else.
*
* @param factory an optional factory class that is called to instantiate a
* cursor when query is called
* @return a SQLiteDatabase object, or null if the database can't be created
*/
public static SQLiteDatabase create(CursorFactory factory) {
// This is a magic string with special meaning for SQLite.
return openDatabase(SQLiteDatabaseConfiguration.MEMORY_DB_PATH,
factory, CREATE_IF_NECESSARY);
}
/**
* Registers a CustomFunction callback as a function that can be called from
* SQLite database triggers.
*
* @param name the name of the sqlite3 function
* @param numArgs the number of arguments for the function
* @param function callback to call when the function is executed
* @hide
*/
public void addCustomFunction(String name, int numArgs, CustomFunction function) {
// Create wrapper (also validates arguments).
SQLiteCustomFunction wrapper = new SQLiteCustomFunction(name, numArgs, function);
synchronized (mLock) {
throwIfNotOpenLocked();
mConfigurationLocked.customFunctions.add(wrapper);
try {
mConnectionPoolLocked.reconfigure(mConfigurationLocked);
} catch (RuntimeException ex) {
mConfigurationLocked.customFunctions.remove(wrapper);
throw ex;
}
}
}
/**
* Gets the database version.
*
* @return the database version
*/
public int getVersion() {
return ((Long) DatabaseUtils.longForQuery(this, "PRAGMA user_version;", null)).intValue();
}
/**
* Sets the database version.
*
* @param version the new database version
*/
public void setVersion(int version) {
execSQL("PRAGMA user_version = " + version);
}
/**
* Returns the maximum size the database may grow to.
*
* @return the new maximum database size
*/
public long getMaximumSize() {
long pageCount = DatabaseUtils.longForQuery(this, "PRAGMA max_page_count;", null);
return pageCount * getPageSize();
}
/**
* Sets the maximum size the database will grow to. The maximum size cannot
* be set below the current size.
*
* @param numBytes the maximum database size, in bytes
* @return the new maximum database size
*/
public long setMaximumSize(long numBytes) {
long pageSize = getPageSize();
long numPages = numBytes / pageSize;
// If numBytes isn't a multiple of pageSize, bump up a page
if ((numBytes % pageSize) != 0) {
numPages++;
}
long newPageCount = DatabaseUtils.longForQuery(this, "PRAGMA max_page_count = " + numPages,
null);
return newPageCount * pageSize;
}
/**
* Returns the current database page size, in bytes.
*
* @return the database page size, in bytes
*/
public long getPageSize() {
return DatabaseUtils.longForQuery(this, "PRAGMA page_size;", null);
}
/**
* Sets the database page size. The page size must be a power of two. This
* method does not work if any data has been written to the database file,
* and must be called right after the database has been created.
*
* @param numBytes the database page size, in bytes
*/
public void setPageSize(long numBytes) {
execSQL("PRAGMA page_size = " + numBytes);
}
/**
* Mark this table as syncable. When an update occurs in this table the
* _sync_dirty field will be set to ensure proper syncing operation.
*
* @param table the table to mark as syncable
* @param deletedTable The deleted table that corresponds to the
* syncable table
* @deprecated This method no longer serves any useful purpose and has been deprecated.
*/
@Deprecated
public void markTableSyncable(String table, String deletedTable) {
}
/**
* Mark this table as syncable, with the _sync_dirty residing in another
* table. When an update occurs in this table the _sync_dirty field of the
* row in updateTable with the _id in foreignKey will be set to
* ensure proper syncing operation.
*
* @param table an update on this table will trigger a sync time removal
* @param foreignKey this is the column in table whose value is an _id in
* updateTable
* @param updateTable this is the table that will have its _sync_dirty
* @deprecated This method no longer serves any useful purpose and has been deprecated.
*/
@Deprecated
public void markTableSyncable(String table, String foreignKey, String updateTable) {
}
/**
* Finds the name of the first table, which is editable.
*
* @param tables a list of tables
* @return the first table listed
*/
public static String findEditTable(String tables) {
if (!TextUtils.isEmpty(tables)) {
// find the first word terminated by either a space or a comma
int spacepos = tables.indexOf(' ');
int commapos = tables.indexOf(',');
if (spacepos > 0 && (spacepos < commapos || commapos < 0)) {
return tables.substring(0, spacepos);
} else if (commapos > 0 && (commapos < spacepos || spacepos < 0) ) {
return tables.substring(0, commapos);
}
return tables;
} else {
throw new IllegalStateException("Invalid tables");
}
}
/**
* Compiles an SQL statement into a reusable pre-compiled statement object.
* The parameters are identical to {@link #execSQL(String)}. You may put ?s in the
* statement and fill in those values with {@link SQLiteProgram#bindString}
* and {@link SQLiteProgram#bindLong} each time you want to run the
* statement. Statements may not return result sets larger than 1x1.
*
* No two threads should be using the same {@link SQLiteStatement} at the same time.
*
* @param sql The raw SQL statement, may contain ? for unknown values to be
* bound later.
* @return A pre-compiled {@link SQLiteStatement} object. Note that
* {@link SQLiteStatement}s are not synchronized, see the documentation for more details.
*/
public SQLiteStatement compileStatement(String sql) throws SQLException {
acquireReference();
try {
return new SQLiteStatement(this, sql, null);
} finally {
releaseReference();
}
}
/**
* Query the given URL, returning a {@link Cursor} over the result set.
*
* @param distinct true if you want each row to be unique, false otherwise.
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in order that they
* appear in the selection. The values will be bound as Strings.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @param limit Limits the number of rows returned by the query,
* formatted as LIMIT clause. Passing null denotes no LIMIT clause.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
public Cursor query(boolean distinct, String table, String[] columns,
String selection, String[] selectionArgs, String groupBy,
String having, String orderBy, String limit) {
return queryWithFactory(null, distinct, table, columns, selection, selectionArgs,
groupBy, having, orderBy, limit, null);
}
/**
* Query the given URL, returning a {@link Cursor} over the result set.
*
* @param distinct true if you want each row to be unique, false otherwise.
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in order that they
* appear in the selection. The values will be bound as Strings.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @param limit Limits the number of rows returned by the query,
* formatted as LIMIT clause. Passing null denotes no LIMIT clause.
* @param cancellationSignal A signal to cancel the operation in progress, or null if none.
* If the operation is canceled, then {@link OperationCanceledException} will be thrown
* when the query is executed.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
public Cursor query(boolean distinct, String table, String[] columns,
String selection, String[] selectionArgs, String groupBy,
String having, String orderBy, String limit, CancellationSignal cancellationSignal) {
return queryWithFactory(null, distinct, table, columns, selection, selectionArgs,
groupBy, having, orderBy, limit, cancellationSignal);
}
/**
* Query the given URL, returning a {@link Cursor} over the result set.
*
* @param cursorFactory the cursor factory to use, or null for the default factory
* @param distinct true if you want each row to be unique, false otherwise.
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in order that they
* appear in the selection. The values will be bound as Strings.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @param limit Limits the number of rows returned by the query,
* formatted as LIMIT clause. Passing null denotes no LIMIT clause.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
public Cursor queryWithFactory(CursorFactory cursorFactory,
boolean distinct, String table, String[] columns,
String selection, String[] selectionArgs, String groupBy,
String having, String orderBy, String limit) {
return queryWithFactory(cursorFactory, distinct, table, columns, selection,
selectionArgs, groupBy, having, orderBy, limit, null);
}
/**
* Query the given URL, returning a {@link Cursor} over the result set.
*
* @param cursorFactory the cursor factory to use, or null for the default factory
* @param distinct true if you want each row to be unique, false otherwise.
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in order that they
* appear in the selection. The values will be bound as Strings.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @param limit Limits the number of rows returned by the query,
* formatted as LIMIT clause. Passing null denotes no LIMIT clause.
* @param cancellationSignal A signal to cancel the operation in progress, or null if none.
* If the operation is canceled, then {@link OperationCanceledException} will be thrown
* when the query is executed.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
public Cursor queryWithFactory(CursorFactory cursorFactory,
boolean distinct, String table, String[] columns,
String selection, String[] selectionArgs, String groupBy,
String having, String orderBy, String limit, CancellationSignal cancellationSignal) {
acquireReference();
try {
String sql = SQLiteQueryBuilder.buildQueryString(
distinct, table, columns, selection, groupBy, having, orderBy, limit);
return rawQueryWithFactory(cursorFactory, sql, selectionArgs,
findEditTable(table), cancellationSignal);
} finally {
releaseReference();
}
}
/**
* Query the given table, returning a {@link Cursor} over the result set.
*
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in order that they
* appear in the selection. The values will be bound as Strings.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
public Cursor query(String table, String[] columns, String selection,
String[] selectionArgs, String groupBy, String having,
String orderBy) {
return query(false, table, columns, selection, selectionArgs, groupBy,
having, orderBy, null /* limit */);
}
/**
* Query the given table, returning a {@link Cursor} over the result set.
*
* @param table The table name to compile the query against.
* @param columns A list of which columns to return. Passing null will
* return all columns, which is discouraged to prevent reading
* data from storage that isn't going to be used.
* @param selection A filter declaring which rows to return, formatted as an
* SQL WHERE clause (excluding the WHERE itself). Passing null
* will return all rows for the given table.
* @param selectionArgs You may include ?s in selection, which will be
* replaced by the values from selectionArgs, in order that they
* appear in the selection. The values will be bound as Strings.
* @param groupBy A filter declaring how to group rows, formatted as an SQL
* GROUP BY clause (excluding the GROUP BY itself). Passing null
* will cause the rows to not be grouped.
* @param having A filter declare which row groups to include in the cursor,
* if row grouping is being used, formatted as an SQL HAVING
* clause (excluding the HAVING itself). Passing null will cause
* all row groups to be included, and is required when row
* grouping is not being used.
* @param orderBy How to order the rows, formatted as an SQL ORDER BY clause
* (excluding the ORDER BY itself). Passing null will use the
* default sort order, which may be unordered.
* @param limit Limits the number of rows returned by the query,
* formatted as LIMIT clause. Passing null denotes no LIMIT clause.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
* @see Cursor
*/
public Cursor query(String table, String[] columns, String selection,
String[] selectionArgs, String groupBy, String having,
String orderBy, String limit) {
return query(false, table, columns, selection, selectionArgs, groupBy,
having, orderBy, limit);
}
/**
* Runs the provided SQL and returns a {@link Cursor} over the result set.
*
* @param sql the SQL query. The SQL string must not be ; terminated
* @param selectionArgs You may include ?s in where clause in the query,
* which will be replaced by the values from selectionArgs. The
* values will be bound as Strings.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
*/
public Cursor rawQuery(String sql, String[] selectionArgs) {
return rawQueryWithFactory(null, sql, selectionArgs, null, null);
}
/**
* Runs the provided SQL and returns a {@link Cursor} over the result set.
*
* @param sql the SQL query. The SQL string must not be ; terminated
* @param selectionArgs You may include ?s in where clause in the query,
* which will be replaced by the values from selectionArgs. The
* values will be bound as Strings.
* @param cancellationSignal A signal to cancel the operation in progress, or null if none.
* If the operation is canceled, then {@link OperationCanceledException} will be thrown
* when the query is executed.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
*/
public Cursor rawQuery(String sql, String[] selectionArgs,
CancellationSignal cancellationSignal) {
return rawQueryWithFactory(null, sql, selectionArgs, null, cancellationSignal);
}
/**
* Runs the provided SQL and returns a cursor over the result set.
*
* @param cursorFactory the cursor factory to use, or null for the default factory
* @param sql the SQL query. The SQL string must not be ; terminated
* @param selectionArgs You may include ?s in where clause in the query,
* which will be replaced by the values from selectionArgs. The
* values will be bound as Strings.
* @param editTable the name of the first table, which is editable
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
*/
public Cursor rawQueryWithFactory(
CursorFactory cursorFactory, String sql, String[] selectionArgs,
String editTable) {
return rawQueryWithFactory(cursorFactory, sql, selectionArgs, editTable, null);
}
/**
* Runs the provided SQL and returns a cursor over the result set.
*
* @param cursorFactory the cursor factory to use, or null for the default factory
* @param sql the SQL query. The SQL string must not be ; terminated
* @param selectionArgs You may include ?s in where clause in the query,
* which will be replaced by the values from selectionArgs. The
* values will be bound as Strings.
* @param editTable the name of the first table, which is editable
* @param cancellationSignal A signal to cancel the operation in progress, or null if none.
* If the operation is canceled, then {@link OperationCanceledException} will be thrown
* when the query is executed.
* @return A {@link Cursor} object, which is positioned before the first entry. Note that
* {@link Cursor}s are not synchronized, see the documentation for more details.
*/
public Cursor rawQueryWithFactory(
CursorFactory cursorFactory, String sql, String[] selectionArgs,
String editTable, CancellationSignal cancellationSignal) {
acquireReference();
try {
SQLiteCursorDriver driver = new SQLiteDirectCursorDriver(this, sql, editTable,
cancellationSignal);
return driver.query(cursorFactory != null ? cursorFactory : mCursorFactory,
selectionArgs);
} finally {
releaseReference();
}
}
/**
* Convenience method for inserting a row into the database.
*
* @param table the table to insert the row into
* @param nullColumnHack optional; may be null.
* SQL doesn't allow inserting a completely empty row without
* naming at least one column name. If your provided values is
* empty, no column names are known and an empty row can't be inserted.
* If not set to null, the nullColumnHack parameter
* provides the name of nullable column name to explicitly insert a NULL into
* in the case where your values is empty.
* @param values this map contains the initial column values for the
* row. The keys should be the column names and the values the
* column values
* @return the row ID of the newly inserted row, or -1 if an error occurred
*/
public long insert(String table, String nullColumnHack, ContentValues values) {
try {
return insertWithOnConflict(table, nullColumnHack, values, CONFLICT_NONE);
} catch (SQLException e) {
Log.e(TAG, "Error inserting " + values, e);
return -1;
}
}
/**
* Convenience method for inserting a row into the database.
*
* @param table the table to insert the row into
* @param nullColumnHack optional; may be null.
* SQL doesn't allow inserting a completely empty row without
* naming at least one column name. If your provided values is
* empty, no column names are known and an empty row can't be inserted.
* If not set to null, the nullColumnHack parameter
* provides the name of nullable column name to explicitly insert a NULL into
* in the case where your values is empty.
* @param values this map contains the initial column values for the
* row. The keys should be the column names and the values the
* column values
* @throws SQLException
* @return the row ID of the newly inserted row, or -1 if an error occurred
*/
public long insertOrThrow(String table, String nullColumnHack, ContentValues values)
throws SQLException {
return insertWithOnConflict(table, nullColumnHack, values, CONFLICT_NONE);
}
/**
* Convenience method for replacing a row in the database.
* Inserts a new row if a row does not already exist.
*
* @param table the table in which to replace the row
* @param nullColumnHack optional; may be null.
* SQL doesn't allow inserting a completely empty row without
* naming at least one column name. If your provided initialValues is
* empty, no column names are known and an empty row can't be inserted.
* If not set to null, the nullColumnHack parameter
* provides the name of nullable column name to explicitly insert a NULL into
* in the case where your initialValues is empty.
* @param initialValues this map contains the initial column values for
* the row. The keys should be the column names and the values the column values.
* @return the row ID of the newly inserted row, or -1 if an error occurred
*/
public long replace(String table, String nullColumnHack, ContentValues initialValues) {
try {
return insertWithOnConflict(table, nullColumnHack, initialValues,
CONFLICT_REPLACE);
} catch (SQLException e) {
Log.e(TAG, "Error inserting " + initialValues, e);
return -1;
}
}
/**
* Convenience method for replacing a row in the database.
* Inserts a new row if a row does not already exist.
*
* @param table the table in which to replace the row
* @param nullColumnHack optional; may be null.
* SQL doesn't allow inserting a completely empty row without
* naming at least one column name. If your provided initialValues is
* empty, no column names are known and an empty row can't be inserted.
* If not set to null, the nullColumnHack parameter
* provides the name of nullable column name to explicitly insert a NULL into
* in the case where your initialValues is empty.
* @param initialValues this map contains the initial column values for
* the row. The keys should be the column names and the values the column values.
* @throws SQLException
* @return the row ID of the newly inserted row, or -1 if an error occurred
*/
public long replaceOrThrow(String table, String nullColumnHack,
ContentValues initialValues) throws SQLException {
return insertWithOnConflict(table, nullColumnHack, initialValues,
CONFLICT_REPLACE);
}
/**
* General method for inserting a row into the database.
*
* @param table the table to insert the row into
* @param nullColumnHack optional; may be null.
* SQL doesn't allow inserting a completely empty row without
* naming at least one column name. If your provided initialValues is
* empty, no column names are known and an empty row can't be inserted.
* If not set to null, the nullColumnHack parameter
* provides the name of nullable column name to explicitly insert a NULL into
* in the case where your initialValues is empty.
* @param initialValues this map contains the initial column values for the
* row. The keys should be the column names and the values the
* column values
* @param conflictAlgorithm for insert conflict resolver
* @return the row ID of the newly inserted row OR -1 if either the
* input parameter conflictAlgorithm = {@link #CONFLICT_IGNORE}
* or an error occurred.
*/
public long insertWithOnConflict(String table, String nullColumnHack,
ContentValues initialValues, int conflictAlgorithm) {
acquireReference();
try {
StringBuilder sql = new StringBuilder();
sql.append("INSERT");
sql.append(CONFLICT_VALUES[conflictAlgorithm]);
sql.append(" INTO ");
sql.append(table);
sql.append('(');
Object[] bindArgs = null;
int size = (initialValues != null && initialValues.size() > 0)
? initialValues.size() : 0;
if (size > 0) {
bindArgs = new Object[size];
int i = 0;
for (String colName : initialValues.keySet()) {
sql.append((i > 0) ? "," : "");
sql.append(colName);
bindArgs[i++] = initialValues.get(colName);
}
sql.append(')');
sql.append(" VALUES (");
for (i = 0; i < size; i++) {
sql.append((i > 0) ? ",?" : "?");
}
} else {
sql.append(nullColumnHack + ") VALUES (NULL");
}
sql.append(')');
SQLiteStatement statement = new SQLiteStatement(this, sql.toString(), bindArgs);
try {
return statement.executeInsert();
} finally {
statement.close();
}
} finally {
releaseReference();
}
}
/**
* Convenience method for deleting rows in the database.
*
* @param table the table to delete from
* @param whereClause the optional WHERE clause to apply when deleting.
* Passing null will delete all rows.
* @param whereArgs You may include ?s in the where clause, which
* will be replaced by the values from whereArgs. The values
* will be bound as Strings.
* @return the number of rows affected if a whereClause is passed in, 0
* otherwise. To remove all rows and get a count pass "1" as the
* whereClause.
*/
public int delete(String table, String whereClause, String[] whereArgs) {
acquireReference();
try {
SQLiteStatement statement = new SQLiteStatement(this, "DELETE FROM " + table +
(!TextUtils.isEmpty(whereClause) ? " WHERE " + whereClause : ""), whereArgs);
try {
return statement.executeUpdateDelete();
} finally {
statement.close();
}
} finally {
releaseReference();
}
}
/**
* Convenience method for updating rows in the database.
*
* @param table the table to update in
* @param values a map from column names to new column values. null is a
* valid value that will be translated to NULL.
* @param whereClause the optional WHERE clause to apply when updating.
* Passing null will update all rows.
* @param whereArgs You may include ?s in the where clause, which
* will be replaced by the values from whereArgs. The values
* will be bound as Strings.
* @return the number of rows affected
*/
public int update(String table, ContentValues values, String whereClause, String[] whereArgs) {
return updateWithOnConflict(table, values, whereClause, whereArgs, CONFLICT_NONE);
}
/**
* Convenience method for updating rows in the database.
*
* @param table the table to update in
* @param values a map from column names to new column values. null is a
* valid value that will be translated to NULL.
* @param whereClause the optional WHERE clause to apply when updating.
* Passing null will update all rows.
* @param whereArgs You may include ?s in the where clause, which
* will be replaced by the values from whereArgs. The values
* will be bound as Strings.
* @param conflictAlgorithm for update conflict resolver
* @return the number of rows affected
*/
public int updateWithOnConflict(String table, ContentValues values,
String whereClause, String[] whereArgs, int conflictAlgorithm) {
if (values == null || values.size() == 0) {
throw new IllegalArgumentException("Empty values");
}
acquireReference();
try {
StringBuilder sql = new StringBuilder(120);
sql.append("UPDATE ");
sql.append(CONFLICT_VALUES[conflictAlgorithm]);
sql.append(table);
sql.append(" SET ");
// move all bind args to one array
int setValuesSize = values.size();
int bindArgsSize = (whereArgs == null) ? setValuesSize : (setValuesSize + whereArgs.length);
Object[] bindArgs = new Object[bindArgsSize];
int i = 0;
for (String colName : values.keySet()) {
sql.append((i > 0) ? "," : "");
sql.append(colName);
bindArgs[i++] = values.get(colName);
sql.append("=?");
}
if (whereArgs != null) {
for (i = setValuesSize; i < bindArgsSize; i++) {
bindArgs[i] = whereArgs[i - setValuesSize];
}
}
if (!TextUtils.isEmpty(whereClause)) {
sql.append(" WHERE ");
sql.append(whereClause);
}
SQLiteStatement statement = new SQLiteStatement(this, sql.toString(), bindArgs);
try {
return statement.executeUpdateDelete();
} finally {
statement.close();
}
} finally {
releaseReference();
}
}
/**
* Execute a single SQL statement that is NOT a SELECT
* or any other SQL statement that returns data.
*
* It has no means to return any data (such as the number of affected rows).
* Instead, you're encouraged to use {@link #insert(String, String, ContentValues)},
* {@link #update(String, ContentValues, String, String[])}, et al, when possible.
*
*
* When using {@link #enableWriteAheadLogging()}, journal_mode is
* automatically managed by this class. So, do not set journal_mode
* using "PRAGMA journal_mode'" statement if your app is using
* {@link #enableWriteAheadLogging()}
*
*
* @param sql the SQL statement to be executed. Multiple statements separated by semicolons are
* not supported.
* @throws SQLException if the SQL string is invalid
*/
public void execSQL(String sql) throws SQLException {
executeSql(sql, null);
}
/**
* Execute a single SQL statement that is NOT a SELECT/INSERT/UPDATE/DELETE.
*
* For INSERT statements, use any of the following instead.
*
* - {@link #insert(String, String, ContentValues)}
* - {@link #insertOrThrow(String, String, ContentValues)}
* - {@link #insertWithOnConflict(String, String, ContentValues, int)}
*
*
* For UPDATE statements, use any of the following instead.
*
* - {@link #update(String, ContentValues, String, String[])}
* - {@link #updateWithOnConflict(String, ContentValues, String, String[], int)}
*
*
* For DELETE statements, use any of the following instead.
*
* - {@link #delete(String, String, String[])}
*
*
* For example, the following are good candidates for using this method:
*
* - ALTER TABLE
* - CREATE or DROP table / trigger / view / index / virtual table
* - REINDEX
* - RELEASE
* - SAVEPOINT
* - PRAGMA that returns no data
*
*
*
* When using {@link #enableWriteAheadLogging()}, journal_mode is
* automatically managed by this class. So, do not set journal_mode
* using "PRAGMA journal_mode'" statement if your app is using
* {@link #enableWriteAheadLogging()}
*
*
* @param sql the SQL statement to be executed. Multiple statements separated by semicolons are
* not supported.
* @param bindArgs only byte[], String, Long and Double are supported in bindArgs.
* @throws SQLException if the SQL string is invalid
*/
public void execSQL(String sql, Object[] bindArgs) throws SQLException {
if (bindArgs == null) {
throw new IllegalArgumentException("Empty bindArgs");
}
executeSql(sql, bindArgs);
}
private int executeSql(String sql, Object[] bindArgs) throws SQLException {
acquireReference();
try {
if (DatabaseUtils.getSqlStatementType(sql) == DatabaseUtils.STATEMENT_ATTACH) {
boolean disableWal = false;
synchronized (mLock) {
if (!mHasAttachedDbsLocked) {
mHasAttachedDbsLocked = true;
disableWal = true;
}
}
if (disableWal) {
disableWriteAheadLogging();
}
}
SQLiteStatement statement = new SQLiteStatement(this, sql, bindArgs);
try {
return statement.executeUpdateDelete();
} finally {
statement.close();
}
} finally {
releaseReference();
}
}
/**
* Verifies that a SQL SELECT statement is valid by compiling it.
* If the SQL statement is not valid, this method will throw a {@link SQLiteException}.
*
* @param sql SQL to be validated
* @param cancellationSignal A signal to cancel the operation in progress, or null if none.
* If the operation is canceled, then {@link OperationCanceledException} will be thrown
* when the query is executed.
* @throws SQLiteException if {@code sql} is invalid
*/
public void validateSql(String sql, CancellationSignal cancellationSignal) {
getThreadSession().prepare(sql,
getThreadDefaultConnectionFlags(/* readOnly =*/ true), cancellationSignal, null);
}
/**
* Returns true if the database is opened as read only.
*
* @return True if database is opened as read only.
*/
public boolean isReadOnly() {
synchronized (mLock) {
return isReadOnlyLocked();
}
}
private boolean isReadOnlyLocked() {
return (mConfigurationLocked.openFlags & OPEN_READ_MASK) == OPEN_READONLY;
}
/**
* Returns true if the database is in-memory db.
*
* @return True if the database is in-memory.
* @hide
*/
public boolean isInMemoryDatabase() {
synchronized (mLock) {
return mConfigurationLocked.isInMemoryDb();
}
}
/**
* Returns true if the database is currently open.
*
* @return True if the database is currently open (has not been closed).
*/
public boolean isOpen() {
synchronized (mLock) {
return mConnectionPoolLocked != null;
}
}
/**
* Returns true if the new version code is greater than the current database version.
*
* @param newVersion The new version code.
* @return True if the new version code is greater than the current database version.
*/
public boolean needUpgrade(int newVersion) {
return newVersion > getVersion();
}
/**
* Gets the path to the database file.
*
* @return The path to the database file.
*/
public final String getPath() {
synchronized (mLock) {
return mConfigurationLocked.path;
}
}
/**
* Sets the locale for this database. Does nothing if this database has
* the {@link #NO_LOCALIZED_COLLATORS} flag set or was opened read only.
*
* @param locale The new locale.
*
* @throws SQLException if the locale could not be set. The most common reason
* for this is that there is no collator available for the locale you requested.
* In this case the database remains unchanged.
*/
public void setLocale(Locale locale) {
if (locale == null) {
throw new IllegalArgumentException("locale must not be null.");
}
synchronized (mLock) {
throwIfNotOpenLocked();
final Locale oldLocale = mConfigurationLocked.locale;
mConfigurationLocked.locale = locale;
try {
mConnectionPoolLocked.reconfigure(mConfigurationLocked);
} catch (RuntimeException ex) {
mConfigurationLocked.locale = oldLocale;
throw ex;
}
}
}
/**
* Sets the maximum size of the prepared-statement cache for this database.
* (size of the cache = number of compiled-sql-statements stored in the cache).
*
* Maximum cache size can ONLY be increased from its current size (default = 10).
* If this method is called with smaller size than the current maximum value,
* then IllegalStateException is thrown.
*
* This method is thread-safe.
*
* @param cacheSize the size of the cache. can be (0 to {@link #MAX_SQL_CACHE_SIZE})
* @throws IllegalStateException if input cacheSize > {@link #MAX_SQL_CACHE_SIZE}.
*/
public void setMaxSqlCacheSize(int cacheSize) {
if (cacheSize > MAX_SQL_CACHE_SIZE || cacheSize < 0) {
throw new IllegalStateException(
"expected value between 0 and " + MAX_SQL_CACHE_SIZE);
}
synchronized (mLock) {
throwIfNotOpenLocked();
final int oldMaxSqlCacheSize = mConfigurationLocked.maxSqlCacheSize;
mConfigurationLocked.maxSqlCacheSize = cacheSize;
try {
mConnectionPoolLocked.reconfigure(mConfigurationLocked);
} catch (RuntimeException ex) {
mConfigurationLocked.maxSqlCacheSize = oldMaxSqlCacheSize;
throw ex;
}
}
}
/**
* Sets whether foreign key constraints are enabled for the database.
*
* By default, foreign key constraints are not enforced by the database.
* This method allows an application to enable foreign key constraints.
* It must be called each time the database is opened to ensure that foreign
* key constraints are enabled for the session.
*
* A good time to call this method is right after calling {@link #openOrCreateDatabase}
* or in the {@link SQLiteOpenHelper#onConfigure} callback.
*
* When foreign key constraints are disabled, the database does not check whether
* changes to the database will violate foreign key constraints. Likewise, when
* foreign key constraints are disabled, the database will not execute cascade
* delete or update triggers. As a result, it is possible for the database
* state to become inconsistent. To perform a database integrity check,
* call {@link #isDatabaseIntegrityOk}.
*
* This method must not be called while a transaction is in progress.
*
* See also SQLite Foreign Key Constraints
* for more details about foreign key constraint support.
*
*
* @param enable True to enable foreign key constraints, false to disable them.
*
* @throws IllegalStateException if the are transactions is in progress
* when this method is called.
*/
public void setForeignKeyConstraintsEnabled(boolean enable) {
synchronized (mLock) {
throwIfNotOpenLocked();
if (mConfigurationLocked.foreignKeyConstraintsEnabled == enable) {
return;
}
mConfigurationLocked.foreignKeyConstraintsEnabled = enable;
try {
mConnectionPoolLocked.reconfigure(mConfigurationLocked);
} catch (RuntimeException ex) {
mConfigurationLocked.foreignKeyConstraintsEnabled = !enable;
throw ex;
}
}
}
/**
* This method enables parallel execution of queries from multiple threads on the
* same database. It does this by opening multiple connections to the database
* and using a different database connection for each query. The database
* journal mode is also changed to enable writes to proceed concurrently with reads.
*
* When write-ahead logging is not enabled (the default), it is not possible for
* reads and writes to occur on the database at the same time. Before modifying the
* database, the writer implicitly acquires an exclusive lock on the database which
* prevents readers from accessing the database until the write is completed.
*
* In contrast, when write-ahead logging is enabled (by calling this method), write
* operations occur in a separate log file which allows reads to proceed concurrently.
* While a write is in progress, readers on other threads will perceive the state
* of the database as it was before the write began. When the write completes, readers
* on other threads will then perceive the new state of the database.
*
* It is a good idea to enable write-ahead logging whenever a database will be
* concurrently accessed and modified by multiple threads at the same time.
* However, write-ahead logging uses significantly more memory than ordinary
* journaling because there are multiple connections to the same database.
* So if a database will only be used by a single thread, or if optimizing
* concurrency is not very important, then write-ahead logging should be disabled.
*
* After calling this method, execution of queries in parallel is enabled as long as
* the database remains open. To disable execution of queries in parallel, either
* call {@link #disableWriteAheadLogging} or close the database and reopen it.
*
* The maximum number of connections used to execute queries in parallel is
* dependent upon the device memory and possibly other properties.
*
* If a query is part of a transaction, then it is executed on the same database handle the
* transaction was begun.
*
* Writers should use {@link #beginTransactionNonExclusive()} or
* {@link #beginTransactionWithListenerNonExclusive(SQLiteTransactionListener)}
* to start a transaction. Non-exclusive mode allows database file to be in readable
* by other threads executing queries.
*
* If the database has any attached databases, then execution of queries in parallel is NOT
* possible. Likewise, write-ahead logging is not supported for read-only databases
* or memory databases. In such cases, {@link #enableWriteAheadLogging} returns false.
*
* The best way to enable write-ahead logging is to pass the
* {@link #ENABLE_WRITE_AHEAD_LOGGING} flag to {@link #openDatabase}. This is
* more efficient than calling {@link #enableWriteAheadLogging}.
*
* SQLiteDatabase db = SQLiteDatabase.openDatabase("db_filename", cursorFactory,
* SQLiteDatabase.CREATE_IF_NECESSARY | SQLiteDatabase.ENABLE_WRITE_AHEAD_LOGGING,
* myDatabaseErrorHandler);
* db.enableWriteAheadLogging();
*
* Another way to enable write-ahead logging is to call {@link #enableWriteAheadLogging}
* after opening the database.
*
* SQLiteDatabase db = SQLiteDatabase.openDatabase("db_filename", cursorFactory,
* SQLiteDatabase.CREATE_IF_NECESSARY, myDatabaseErrorHandler);
* db.enableWriteAheadLogging();
*
* See also SQLite Write-Ahead Logging for
* more details about how write-ahead logging works.
*
*
* @return True if write-ahead logging is enabled.
*
* @throws IllegalStateException if there are transactions in progress at the
* time this method is called. WAL mode can only be changed when there are no
* transactions in progress.
*
* @see #ENABLE_WRITE_AHEAD_LOGGING
* @see #disableWriteAheadLogging
*/
public boolean enableWriteAheadLogging() {
synchronized (mLock) {
throwIfNotOpenLocked();
if ((mConfigurationLocked.openFlags & ENABLE_WRITE_AHEAD_LOGGING) != 0) {
return true;
}
if (isReadOnlyLocked()) {
// WAL doesn't make sense for readonly-databases.
// TODO: True, but connection pooling does still make sense...
return false;
}
if (mConfigurationLocked.isInMemoryDb()) {
Log.i(TAG, "can't enable WAL for memory databases.");
return false;
}
// make sure this database has NO attached databases because sqlite's write-ahead-logging
// doesn't work for databases with attached databases
if (mHasAttachedDbsLocked) {
if (Log.isLoggable(TAG, Log.DEBUG)) {
Log.d(TAG, "this database: " + mConfigurationLocked.label
+ " has attached databases. can't enable WAL.");
}
return false;
}
mConfigurationLocked.openFlags |= ENABLE_WRITE_AHEAD_LOGGING;
try {
mConnectionPoolLocked.reconfigure(mConfigurationLocked);
} catch (RuntimeException ex) {
mConfigurationLocked.openFlags &= ~ENABLE_WRITE_AHEAD_LOGGING;
throw ex;
}
}
return true;
}
/**
* This method disables the features enabled by {@link #enableWriteAheadLogging()}.
*
* @throws IllegalStateException if there are transactions in progress at the
* time this method is called. WAL mode can only be changed when there are no
* transactions in progress.
*
* @see #enableWriteAheadLogging
*/
public void disableWriteAheadLogging() {
synchronized (mLock) {
throwIfNotOpenLocked();
if ((mConfigurationLocked.openFlags & ENABLE_WRITE_AHEAD_LOGGING) == 0) {
return;
}
mConfigurationLocked.openFlags &= ~ENABLE_WRITE_AHEAD_LOGGING;
try {
mConnectionPoolLocked.reconfigure(mConfigurationLocked);
} catch (RuntimeException ex) {
mConfigurationLocked.openFlags |= ENABLE_WRITE_AHEAD_LOGGING;
throw ex;
}
}
}
/**
* Returns true if write-ahead logging has been enabled for this database.
*
* @return True if write-ahead logging has been enabled for this database.
*
* @see #enableWriteAheadLogging
* @see #ENABLE_WRITE_AHEAD_LOGGING
*/
public boolean isWriteAheadLoggingEnabled() {
synchronized (mLock) {
throwIfNotOpenLocked();
return (mConfigurationLocked.openFlags & ENABLE_WRITE_AHEAD_LOGGING) != 0;
}
}
/**
* Collect statistics about all open databases in the current process.
* Used by bug report.
*/
static ArrayList getDbStats() {
ArrayList dbStatsList = new ArrayList();
for (SQLiteDatabase db : getActiveDatabases()) {
db.collectDbStats(dbStatsList);
}
return dbStatsList;
}
private void collectDbStats(ArrayList dbStatsList) {
synchronized (mLock) {
if (mConnectionPoolLocked != null) {
mConnectionPoolLocked.collectDbStats(dbStatsList);
}
}
}
private static ArrayList getActiveDatabases() {
ArrayList databases = new ArrayList();
synchronized (sActiveDatabases) {
databases.addAll(sActiveDatabases.keySet());
}
return databases;
}
/**
* Dump detailed information about all open databases in the current process.
* Used by bug report.
*/
static void dumpAll(Printer printer, boolean verbose) {
for (SQLiteDatabase db : getActiveDatabases()) {
db.dump(printer, verbose);
}
}
private void dump(Printer printer, boolean verbose) {
synchronized (mLock) {
if (mConnectionPoolLocked != null) {
printer.println("");
mConnectionPoolLocked.dump(printer, verbose);
}
}
}
/**
* Returns list of full pathnames of all attached databases including the main database
* by executing 'pragma database_list' on the database.
*
* @return ArrayList of pairs of (database name, database file path) or null if the database
* is not open.
*/
public List> getAttachedDbs() {
ArrayList> attachedDbs = new ArrayList>();
synchronized (mLock) {
if (mConnectionPoolLocked == null) {
return null; // not open
}
if (!mHasAttachedDbsLocked) {
// No attached databases.
// There is a small window where attached databases exist but this flag is not
// set yet. This can occur when this thread is in a race condition with another
// thread that is executing the SQL statement: "attach database as "
// If this thread is NOT ok with such a race condition (and thus possibly not
// receivethe entire list of attached databases), then the caller should ensure
// that no thread is executing any SQL statements while a thread is calling this
// method. Typically, this method is called when 'adb bugreport' is done or the
// caller wants to collect stats on the database and all its attached databases.
attachedDbs.add(new Pair("main", mConfigurationLocked.path));
return attachedDbs;
}
acquireReference();
}
try {
// has attached databases. query sqlite to get the list of attached databases.
Cursor c = null;
try {
c = rawQuery("pragma database_list;", null);
while (c.moveToNext()) {
// sqlite returns a row for each database in the returned list of databases.
// in each row,
// 1st column is the database name such as main, or the database
// name specified on the "ATTACH" command
// 2nd column is the database file path.
attachedDbs.add(new Pair(c.getString(1), c.getString(2)));
}
} finally {
if (c != null) {
c.close();
}
}
return attachedDbs;
} finally {
releaseReference();
}
}
/**
* Runs 'pragma integrity_check' on the given database (and all the attached databases)
* and returns true if the given database (and all its attached databases) pass integrity_check,
* false otherwise.
*
* If the result is false, then this method logs the errors reported by the integrity_check
* command execution.
*
* Note that 'pragma integrity_check' on a database can take a long time.
*
* @return true if the given database (and all its attached databases) pass integrity_check,
* false otherwise.
*/
public boolean isDatabaseIntegrityOk() {
acquireReference();
try {
List> attachedDbs = null;
try {
attachedDbs = getAttachedDbs();
if (attachedDbs == null) {
throw new IllegalStateException("databaselist for: " + getPath() + " couldn't " +
"be retrieved. probably because the database is closed");
}
} catch (SQLiteException e) {
// can't get attachedDb list. do integrity check on the main database
attachedDbs = new ArrayList>();
attachedDbs.add(new Pair("main", getPath()));
}
for (int i = 0; i < attachedDbs.size(); i++) {
Pair p = attachedDbs.get(i);
SQLiteStatement prog = null;
try {
prog = compileStatement("PRAGMA " + p.first + ".integrity_check(1);");
String rslt = prog.simpleQueryForString();
if (!rslt.equalsIgnoreCase("ok")) {
// integrity_checker failed on main or attached databases
Log.e(TAG, "PRAGMA integrity_check on " + p.second + " returned: " + rslt);
return false;
}
} finally {
if (prog != null) prog.close();
}
}
} finally {
releaseReference();
}
return true;
}
@Override
public String toString() {
return "SQLiteDatabase: " + getPath();
}
private void throwIfNotOpenLocked() {
if (mConnectionPoolLocked == null) {
throw new IllegalStateException("The database '" + mConfigurationLocked.label
+ "' is not open.");
}
}
/**
* Used to allow returning sub-classes of {@link Cursor} when calling query.
*/
public interface CursorFactory {
/**
* See {@link SQLiteCursor#SQLiteCursor(SQLiteCursorDriver, String, SQLiteQuery)}.
*/
public Cursor newCursor(SQLiteDatabase db,
SQLiteCursorDriver masterQuery, String editTable,
SQLiteQuery query);
}
/**
* A callback interface for a custom sqlite3 function.
* This can be used to create a function that can be called from
* sqlite3 database triggers.
* @hide
*/
public interface CustomFunction {
public void callback(String[] args);
}
public static boolean hasCodec() {
return SQLiteConnection.hasCodec();
}
public void enableLocalizedCollators() {
mConnectionPoolLocked.enableLocalizedCollators();
}
}