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/*
* Copyright (c) 2007 David Crawshaw
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package org.sqlite.core;
import org.sqlite.BusyHandler;
import org.sqlite.Function;
import org.sqlite.ProgressHandler;
import org.sqlite.SQLiteConfig;
import org.sqlite.SQLiteErrorCode;
import org.sqlite.SQLiteException;
import java.sql.BatchUpdateException;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
/*
* This class is the interface to SQLite. It provides some helper functions
* used by other parts of the driver. The goal of the helper functions here
* are not only to provide functionality, but to handle contractual
* differences between the JDBC specification and the SQLite C API.
*
* The process of moving SQLite weirdness into this class is incomplete.
* You'll still find lots of code in Stmt and PrepStmt that are doing
* implicit contract conversions. Sorry.
*
* The subclass, NativeDB, provides the actual access to SQLite functions.
*/
public abstract class DB implements Codes
{
private final String url;
private final String fileName;
private final SQLiteConfig config;
private final AtomicBoolean closed = new AtomicBoolean(true);
/** The "begin;"and "commit;" statement handles. */
long begin = 0;
long commit = 0;
/** Tracer for statements to avoid unfinalized statements on db close. */
private final Map stmts = new HashMap();
public DB(String url, String fileName, SQLiteConfig config)
throws SQLException
{
this.url = url;
this.fileName = fileName;
this.config = config;
}
public String getUrl() {
return url;
}
public boolean isClosed() {
return closed.get();
}
public SQLiteConfig getConfig() {
return config;
}
// WRAPPER FUNCTIONS ////////////////////////////////////////////
/**
* Aborts any pending operation and returns at its earliest opportunity.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/interrupt.html
*/
public abstract void interrupt() throws SQLException;
/**
* Sets a busy handler that sleeps
* for a specified amount of time when a table is locked.
* @param ms Time to sleep in milliseconds.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/busy_timeout.html
*/
public abstract void busy_timeout(int ms) throws SQLException;
/**
* Sets a busy handler that sleeps
* for a specified amount of time when a table is locked.
* @param busyHandler
* @throws SQLException
* @see http://www.sqlite.org/c3ref/busy_timeout.html
*/
public abstract void busy_handler(BusyHandler busyHandler) throws SQLException;
/**
* Return English-language text that describes the error as either UTF-8 or UTF-16.
* @return Error description in English.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/errcode.html
*/
abstract String errmsg() throws SQLException;
/**
* Returns the value for SQLITE_VERSION, SQLITE_VERSION_NUMBER, and SQLITE_SOURCE_ID C
* preprocessor macros that are associated with the library.
* @return Compile-time SQLite version information.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/libversion.html
* @see http://www.sqlite.org/c3ref/c_source_id.html
*/
public abstract String libversion() throws SQLException;
/**
* @return Number of rows that were changed, inserted or deleted by the last
* SQL statement
* @throws SQLException
* @see http://www.sqlite.org/c3ref/changes.html
*/
public abstract int changes() throws SQLException;
/**
* @return Number of row changes caused by INSERT, UPDATE or DELETE statements
* since the database connection was opened.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/total_changes.html
*/
public abstract int total_changes() throws SQLException;
/**
* Enables or disables the sharing of the database cache and schema data structures between
* connections to the same database.
* @param enable True to enable; false otherwise.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/enable_shared_cache.html
* @see org.sqlite.SQLiteErrorCode
*/
public abstract int shared_cache(boolean enable) throws SQLException;
/**
* Enables or disables loading of SQLite extensions.
* @param enable True to enable; false otherwise.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/load_extension.html
*/
public abstract int enable_load_extension(boolean enable) throws SQLException;
/**
* Executes an SQL statement using the process of compiling, evaluating, and destroying the
* prepared statement object.
* @param sql SQL statement to be executed.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/exec.html
*/
public final synchronized void exec(String sql, boolean autoCommit) throws SQLException {
long pointer = 0;
try {
pointer = prepare(sql);
int rc = step(pointer);
switch (rc) {
case SQLITE_DONE:
ensureAutoCommit(autoCommit);
return;
case SQLITE_ROW:
return;
default:
throwex(rc);
}
}
finally {
finalize(pointer);
}
}
/**
* Creates an SQLite interface to a database for the given connection.
* @param file The database.
* @param openFlags File opening configurations
* (http://www.sqlite.org/c3ref/c_open_autoproxy.html)
* @throws SQLException
* @see http://www.sqlite.org/c3ref/open.html
*/
public final synchronized void open(String file, int openFlags) throws SQLException {
_open(file, openFlags);
closed.set(false);
if (fileName.startsWith("file:") && !fileName.contains("cache=")) {
// URI cache overrides flags
shared_cache(config.isEnabledSharedCache());
}
enable_load_extension(config.isEnabledLoadExtension());
busy_timeout(config.getBusyTimeout());
}
/**
* Closes a database connection and finalizes any remaining statements before
* the closing operation.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/close.html
*/
public final synchronized void close() throws SQLException {
// finalize any remaining statements before closing db
synchronized (stmts) {
Iterator> i = stmts.entrySet().iterator();
while (i.hasNext()) {
Map.Entry entry = i.next();
CoreStatement stmt = entry.getValue();
finalize(entry.getKey().longValue());
if (stmt != null) {
stmt.pointer = 0;
}
i.remove();
}
}
// remove memory used by user-defined functions
free_functions();
// clean up commit object
if (begin != 0) {
finalize(begin);
begin = 0;
}
if (commit != 0) {
finalize(commit);
commit = 0;
}
closed.set(true);
_close();
}
/**
* Complies the an SQL statement.
* @param stmt The SQL statement to compile.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/prepare.html
*/
public final synchronized void prepare(CoreStatement stmt) throws SQLException {
if (stmt.sql == null) {
throw new NullPointerException();
}
if (stmt.pointer != 0) {
finalize(stmt);
}
stmt.pointer = prepare(stmt.sql);
stmts.put(new Long(stmt.pointer), stmt);
}
/**
* Destroys a statement.
* @param stmt The statement to destroy.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/finalize.html
*/
public final synchronized int finalize(CoreStatement stmt) throws SQLException {
if (stmt.pointer == 0) {
return 0;
}
int rc = SQLITE_ERROR;
try {
rc = finalize(stmt.pointer);
}
finally {
stmts.remove(new Long(stmt.pointer));
stmt.pointer = 0;
}
return rc;
}
/**
* Creates an SQLite interface to a database with the provided open flags.
* @param filename The database to open.
* @param openFlags File opening configurations
* (http://www.sqlite.org/c3ref/c_open_autoproxy.html)
* @throws SQLException
* @see http://www.sqlite.org/c3ref/open.html
*/
protected abstract void _open(String filename, int openFlags) throws SQLException;
/**
* Closes the SQLite interface to a database.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/close.html
*/
protected abstract void _close() throws SQLException;
/**
* Complies, evaluates, executes and commits an SQL statement.
* @param sql An SQL statement.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/exec.html
*/
public abstract int _exec(String sql) throws SQLException;
/**
* Complies an SQL statement.
* @param sql An SQL statement.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/prepare.html
*/
protected abstract long prepare(String sql) throws SQLException;
/**
* Destroys a prepared statement.
* @param stmt Pointer to the statement pointer.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/finalize.html
*/
protected abstract int finalize(long stmt) throws SQLException;
/**
* Evaluates a statement.
* @param stmt Pointer to the statement.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/step.html
*/
public abstract int step(long stmt) throws SQLException;
/**
* Sets a prepared statement object back to its initial state,
* ready to be re-executed.
* @param stmt Pointer to the statement.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/reset.html
*/
public abstract int reset(long stmt) throws SQLException;
/**
* Reset all bindings on a prepared statement (reset all host parameters to NULL).
* @param stmt Pointer to the statement.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/clear_bindings.html
*/
public abstract int clear_bindings(long stmt) throws SQLException; // TODO remove?
/**
* @param stmt Pointer to the statement.
* @return Number of parameters in a prepared SQL.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/bind_parameter_count.html
*/
abstract int bind_parameter_count(long stmt) throws SQLException;
/**
* @param stmt Pointer to the statement.
* @return Number of columns in the result set returned by the prepared statement.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/column_count.html
*/
public abstract int column_count(long stmt) throws SQLException;
/**
* @param stmt Pointer to the statement.
* @param col Number of column.
* @return Datatype code for the initial data type of the result column.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/column_blob.html
*/
public abstract int column_type(long stmt, int col) throws SQLException;
/**
* @param stmt Pointer to the statement.
* @param col Number of column.
* @return Declared type of the table column for prepared statement.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/column_decltype.html
*/
public abstract String column_decltype(long stmt, int col) throws SQLException;
/**
* @param stmt Pointer to the statement.
* @param col Number of column.
* @return Original text of column name which is the declared in the CREATE TABLE statement.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/column_database_name.html
*/
public abstract String column_table_name(long stmt, int col) throws SQLException;
/**
* @param stmt Pointer to the statement.
* @param col The number of column.
* @return Name assigned to a particular column in the result set of a SELECT statement.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/column_name.html
*/
public abstract String column_name(long stmt, int col) throws SQLException;
/**
* @param stmt Pointer to the statement.
* @param col Number of column.
* @return Value of the column as text data type in the result set of a SELECT statement.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/column_blob.html
*/
public abstract String column_text(long stmt, int col) throws SQLException;
/**
* @param stmt Pointer to the statement.
* @param col Number of column.
* @return BLOB value of the column in the result set of a SELECT statement
* @throws SQLException
* @see http://www.sqlite.org/c3ref/column_blob.html
*/
public abstract byte[] column_blob(long stmt, int col) throws SQLException;
/**
* @param stmt Pointer to the statement.
* @param col Number of column.
* @return DOUBLE value of the column in the result set of a SELECT statement
* @throws SQLException
* @see http://www.sqlite.org/c3ref/column_blob.html
*/
public abstract double column_double(long stmt, int col) throws SQLException;
/**
* @param stmt Pointer to the statement.
* @param col Number of column.
* @return LONG value of the column in the result set of a SELECT statement.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/column_blob.html
*/
public abstract long column_long(long stmt, int col) throws SQLException;
/**
* @param stmt Pointer to the statement.
* @param col Number of column.
* @return INT value of column in the result set of a SELECT statement.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/column_blob.html
*/
public abstract int column_int(long stmt, int col) throws SQLException;
/**
* Binds NULL value to prepared statements with the pointer to the statement object and the
* index of the SQL parameter to be set to NULL.
* @param stmt Pointer to the statement.
* @param pos The index of the SQL parameter to be set to NULL.
* @return Result Codes
* @throws SQLException
*/
abstract int bind_null(long stmt, int pos) throws SQLException;
/**
* Binds int value to prepared statements with the pointer to the statement object, the index of
* the SQL parameter to be set and the value to bind to the parameter.
* @param stmt Pointer to the statement.
* @param pos The index of the SQL parameter to be set.
* @param v Value to bind to the parameter.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/bind_blob.html
*/
abstract int bind_int(long stmt, int pos, int v) throws SQLException;
/**
* Binds long value to prepared statements with the pointer to the statement object, the index
* of the SQL parameter to be set and the value to bind to the parameter.
* @param stmt Pointer to the statement.
* @param pos The index of the SQL parameter to be set.
* @param v Value to bind to the parameter.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/bind_blob.html
*/
abstract int bind_long(long stmt, int pos, long v) throws SQLException;
/**
* Binds double value to prepared statements with the pointer to the statement object, the index
* of the SQL parameter to be set and the value to bind to the parameter.
* @param stmt Pointer to the statement.
* @param pos Index of the SQL parameter to be set.
* @param v Value to bind to the parameter.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/bind_blob.html
*/
abstract int bind_double(long stmt, int pos, double v) throws SQLException;
/**
* Binds text value to prepared statements with the pointer to the statement object, the index
* of the SQL parameter to be set and the value to bind to the parameter.
* @param stmt Pointer to the statement.
* @param pos Index of the SQL parameter to be set.
* @param v value to bind to the parameter.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/bind_blob.html
*/
abstract int bind_text(long stmt, int pos, String v) throws SQLException;
/**
* Binds blob value to prepared statements with the pointer to the statement object, the index
* of the SQL parameter to be set and the value to bind to the parameter.
* @param stmt Pointer to the statement.
* @param pos Index of the SQL parameter to be set.
* @param v Value to bind to the parameter.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/bind_blob.html
*/
abstract int bind_blob(long stmt, int pos, byte[] v) throws SQLException;
/**
* Sets the result of an SQL function as NULL with the pointer to the SQLite database context.
* @param context Pointer to the SQLite database context.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/result_blob.html
*/
public abstract void result_null(long context) throws SQLException;
/**
* Sets the result of an SQL function as text data type with the pointer to the SQLite database
* context and the the result value of String.
* @param context Pointer to the SQLite database context.
* @param val Result value of an SQL function.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/result_blob.html
*/
public abstract void result_text(long context, String val) throws SQLException;
/**
* Sets the result of an SQL function as blob data type with the pointer to the SQLite database
* context and the the result value of byte array.
* @param context Pointer to the SQLite database context.
* @param val Result value of an SQL function.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/result_blob.html
*/
public abstract void result_blob(long context, byte[] val) throws SQLException;
/**
* Sets the result of an SQL function as double data type with the pointer to the SQLite
* database context and the the result value of double.
* @param context Pointer to the SQLite database context.
* @param val Result value of an SQL function.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/result_blob.html
*/
public abstract void result_double(long context, double val) throws SQLException;
/**
* Sets the result of an SQL function as long data type with the pointer to the SQLite database
* context and the the result value of long.
* @param context Pointer to the SQLite database context.
* @param val Result value of an SQL function.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/result_blob.html
*/
public abstract void result_long(long context, long val) throws SQLException;
/**
* Sets the result of an SQL function as int data type with the pointer to the SQLite database
* context and the the result value of int.
* @param context Pointer to the SQLite database context.
* @param val Result value of an SQL function.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/result_blob.html
*/
public abstract void result_int(long context, int val) throws SQLException;
/**
* Sets the result of an SQL function as an error with the pointer to the SQLite database
* context and the the error of String.
* @param context Pointer to the SQLite database context.
* @param err Error result of an SQL function.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/result_blob.html
*/
public abstract void result_error(long context, String err) throws SQLException;
/**
* @param f SQLite function object.
* @param arg Pointer to the parameter of the SQLite function or aggregate.
* @return Parameter value of the given SQLite function or aggregate in text data type.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/value_blob.html
*/
public abstract String value_text(Function f, int arg) throws SQLException;
/**
* @param f SQLite function object.
* @param arg Pointer to the parameter of the SQLite function or aggregate.
* @return Parameter value of the given SQLite function or aggregate in blob data type.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/value_blob.html
*/
public abstract byte[] value_blob(Function f, int arg) throws SQLException;
/**
* @param f SQLite function object.
* @param arg Pointer to the parameter of the SQLite function or aggregate.
* @return Parameter value of the given SQLite function or aggregate in double data type
* @throws SQLException
* @see http://www.sqlite.org/c3ref/value_blob.html
*/
public abstract double value_double(Function f, int arg) throws SQLException;
/**
* @param f SQLite function object.
* @param arg Pointer to the parameter of the SQLite function or aggregate.
* @return Parameter value of the given SQLite function or aggregate in long data type.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/value_blob.html
*/
public abstract long value_long(Function f, int arg) throws SQLException;
/**
* Accesses the parameter values on the function or aggregate in int data type with the function
* object and the parameter value.
* @param f SQLite function object.
* @param arg Pointer to the parameter of the SQLite function or aggregate.
* @return Parameter value of the given SQLite function or aggregate.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/value_blob.html
*/
public abstract int value_int(Function f, int arg) throws SQLException;
/**
* @param f SQLite function object.
* @param arg Pointer to the parameter of the SQLite function or aggregate.
* @return Parameter datatype of the function or aggregate in int data type.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/value_blob.html
*/
public abstract int value_type(Function f, int arg) throws SQLException;
/**
* Create a user defined function with given function name and the function object.
* @param name The function name to be created.
* @param f SQLite function object.
* @param flags Extra flags to use when creating the function, such as {@link Function#FLAG_DETERMINISTIC}
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/create_function.html
*/
public abstract int create_function(String name, Function f, int flags) throws SQLException;
/**
* De-registers a user defined function
* @param name Name of the function to de-registered.
* @return Result Codes
* @throws SQLException
*/
public abstract int destroy_function(String name) throws SQLException;
/**
* Unused as we use the user_data pointer to store a single word.
* @throws SQLException
*/
abstract void free_functions() throws SQLException;
/**
* @param dbName Database name to be backed up.
* @param destFileName Target backup file name.
* @param observer ProgressObserver object.
* @return Result Codes
* @throws SQLException
*
*/
public abstract int backup(String dbName, String destFileName, ProgressObserver observer) throws SQLException;
/**
* @param dbName Database name for restoring data.
* @param sourceFileName Source file name.
* @param observer ProgressObserver object.
* @return Result Codes
* @throws SQLException
*
*/
public abstract int restore(String dbName, String sourceFileName, ProgressObserver observer) throws SQLException;
public static interface ProgressObserver
{
public void progress(int remaining, int pageCount);
}
/** Progress handler */
public abstract void register_progress_handler(int vmCalls, ProgressHandler progressHandler) throws SQLException;
public abstract void clear_progress_handler() throws SQLException;
/**
* Returns an array describing the attributes (not null, primary key and auto increment) of columns.
* @param stmt Pointer to the statement.
* @return Column attribute array.
* index[col][0] = true if column constrained NOT NULL;
* index[col][1] = true if column is part of the primary key;
* index[col][2] = true if column is auto-increment.
* @throws SQLException
*/
abstract boolean[][] column_metadata(long stmt) throws SQLException;
// COMPOUND FUNCTIONS ////////////////////////////////////////////
/**
* Returns an array of column names in the result set of the SELECT statement.
* @param stmt Stmt object.
* @return String array of column names.
* @throws SQLException
*/
public final synchronized String[] column_names(long stmt) throws SQLException {
String[] names = new String[column_count(stmt)];
for (int i = 0; i < names.length; i++) {
names[i] = column_name(stmt, i);
}
return names;
}
/**
* Bind values to prepared statements
* @param stmt Pointer to the statement.
* @param pos Index of the SQL parameter to be set to NULL.
* @param v Value to bind to the parameter.
* @return Result Codes
* @throws SQLException
* @see http://www.sqlite.org/c3ref/bind_blob.html
*/
final synchronized int sqlbind(long stmt, int pos, Object v) throws SQLException {
pos++;
if (v == null) {
return bind_null(stmt, pos);
}
else if (v instanceof Integer) {
return bind_int(stmt, pos, ((Integer) v).intValue());
}
else if (v instanceof Short) {
return bind_int(stmt, pos, ((Short) v).intValue());
}
else if (v instanceof Long) {
return bind_long(stmt, pos, ((Long) v).longValue());
}
else if (v instanceof Float) {
return bind_double(stmt, pos, ((Float) v).doubleValue());
}
else if (v instanceof Double) {
return bind_double(stmt, pos, ((Double) v).doubleValue());
}
else if (v instanceof String) {
return bind_text(stmt, pos, (String) v);
}
else if (v instanceof byte[]) {
return bind_blob(stmt, pos, (byte[]) v);
}
else {
throw new SQLException("unexpected param type: " + v.getClass());
}
}
/**
* Submits a batch of commands to the database for execution.
* @see java.sql.Statement#executeBatch()
* @param stmt Pointer of Stmt object.
* @param count Number of SQL statements.
* @param vals Array of parameter values.
* @return Array of the number of rows changed or inserted or deleted for each command if all
* commands execute successfully;
* @throws SQLException
*/
final synchronized int[] executeBatch(long stmt, int count, Object[] vals, boolean autoCommit) throws SQLException {
if (count < 1) {
throw new SQLException("count (" + count + ") < 1");
}
final int params = bind_parameter_count(stmt);
int rc;
int[] changes = new int[count];
try {
for (int i = 0; i < count; i++) {
reset(stmt);
for (int j = 0; j < params; j++) {
rc = sqlbind(stmt, j, vals[(i * params) + j]);
if (rc != SQLITE_OK) {
throwex(rc);
}
}
rc = step(stmt);
if (rc != SQLITE_DONE) {
reset(stmt);
if (rc == SQLITE_ROW) {
throw new BatchUpdateException("batch entry " + i + ": query returns results", changes);
}
throwex(rc);
}
changes[i] = changes();
}
}
finally {
ensureAutoCommit(autoCommit);
}
reset(stmt);
return changes;
}
/**
* @see http://www.sqlite.org/c_interface.html#sqlite_exec
* @param stmt Stmt object.
* @param vals Array of parameter values.
* @return True if a row of ResultSet is ready; false otherwise.
* @throws SQLException
*/
public final synchronized boolean execute(CoreStatement stmt, Object[] vals) throws SQLException {
if (vals != null) {
final int params = bind_parameter_count(stmt.pointer);
if (params > vals.length) {
throw new SQLException("assertion failure: param count (" + params + ") > value count (" + vals.length
+ ")");
}
for (int i = 0; i < params; i++) {
int rc = sqlbind(stmt.pointer, i, vals[i]);
if (rc != SQLITE_OK) {
throwex(rc);
}
}
}
int statusCode = step(stmt.pointer) & 0xFF;
switch (statusCode) {
case SQLITE_DONE:
reset(stmt.pointer);
ensureAutoCommit(stmt.conn.getAutoCommit());
return false;
case SQLITE_ROW:
return true;
case SQLITE_BUSY:
case SQLITE_LOCKED:
case SQLITE_MISUSE:
case SQLITE_CONSTRAINT:
throw newSQLException(statusCode);
default:
finalize(stmt);
throw newSQLException(statusCode);
}
}
/**
* Executes the given SQL statement using the one-step query execution interface.
* @param sql SQL statement to be executed.
* @return True if a row of ResultSet is ready; false otherwise.
* @throws SQLException
* @see http://www.sqlite.org/c3ref/exec.html
*/
final synchronized boolean execute(String sql, boolean autoCommit) throws SQLException {
int statusCode = _exec(sql);
switch (statusCode) {
case SQLITE_OK:
return false;
case SQLITE_DONE:
ensureAutoCommit(autoCommit);
return false;
case SQLITE_ROW:
return true;
default:
throw newSQLException(statusCode);
}
}
/**
* Execute an SQL INSERT, UPDATE or DELETE statement with the Stmt object and an array of
* parameter values of the SQL statement..
* @param stmt Stmt object.
* @param vals Array of parameter values.
* @return Number of database rows that were changed or inserted or deleted by the most
* recently completed SQL.
* @throws SQLException
*/
public final synchronized int executeUpdate(CoreStatement stmt, Object[] vals) throws SQLException {
try {
if (execute(stmt, vals)) {
throw new SQLException("query returns results");
}
} finally {
if (stmt.pointer != 0) reset(stmt.pointer);
}
return changes();
}
/**
* Throws SQLException with error message.
* @throws SQLException
*/
final void throwex() throws SQLException {
throw new SQLException(errmsg());
}
/**
* Throws SQLException with error code.
* @param errorCode Error code to be passed.
* @throws SQLException
*/
public final void throwex(int errorCode) throws SQLException {
throw newSQLException(errorCode);
}
/**
* Throws SQL Exception with error code and message.
* @param errorCode Error code to be passed.
* @param errorMessage Error message to be passed.
* @throws SQLException
*/
static final void throwex(int errorCode, String errorMessage) throws SQLiteException {
throw newSQLException(errorCode, errorMessage);
}
/**
* Throws formated SQLException with error code and message.
* @param errorCode Error code to be passed.
* @param errorMessage Error message to be passed.
* @return Formated SQLException with error code and message.
* @throws SQLException
*/
public static SQLiteException newSQLException(int errorCode, String errorMessage) {
SQLiteErrorCode code = SQLiteErrorCode.getErrorCode(errorCode);
SQLiteException e = new SQLiteException(
String.format("%s (%s)", code, errorMessage), code
);
return e;
}
/**
* Throws SQL Exception with error code.
* @param errorCode Error code to be passed.
* @return SQLException with error code and message.
* @throws SQLException
*/
private SQLiteException newSQLException(int errorCode) throws SQLException {
return newSQLException(errorCode, errmsg());
}
/**
* SQLite and the JDBC API have very different ideas about the meaning
* of auto-commit. Under JDBC, when executeUpdate() returns in
* auto-commit mode (the default), the programmer assumes the data has
* been written to disk. In SQLite however, a call to sqlite3_step()
* with an INSERT statement can return SQLITE_OK, and yet the data is
* still in limbo.
*
* This limbo appears when another statement on the database is active,
* e.g. a SELECT. SQLite auto-commit waits until the final read
* statement finishes, and then writes whatever updates have already
* been OKed. So if a program crashes before the reads are complete,
* data is lost. E.g:
*
* select begins
* insert
* select continues
* select finishes
*
* Works as expected, however
*
* select beings
* insert
* select continues
* crash
*
* Results in the data never being written to disk.
*
* As a solution, we call "commit" after every statement in auto-commit
* mode.
* @throws SQLException
*/
final void ensureAutoCommit(boolean autoCommit) throws SQLException {
if (!autoCommit) {
return;
}
if (begin == 0) {
begin = prepare("begin;");
}
if (commit == 0) {
commit = prepare("commit;");
}
try {
if (step(begin) != SQLITE_DONE)
{
return; // assume we are in a transaction
}
int rc = step(commit);
if (rc != SQLITE_DONE) {
reset(commit);
throwex(rc);
}
//throw new SQLException("unable to auto-commit");
}
finally {
reset(begin);
reset(commit);
}
}
}
