android.database.DatabaseUtils 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.
*/
package android.database;
import android.content.ContentValues;
import android.content.Context;
import android.content.OperationApplicationException;
import android.database.sqlite.SQLiteAbortException;
import android.database.sqlite.SQLiteConstraintException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabaseCorruptException;
import android.database.sqlite.SQLiteDiskIOException;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteFullException;
import android.database.sqlite.SQLiteProgram;
import android.database.sqlite.SQLiteStatement;
import android.database.CursorWindow;
import android.os.OperationCanceledException;
import android.os.Parcel;
import android.os.ParcelFileDescriptor;
import android.text.TextUtils;
import android.util.Log;
import android.database.Cursor;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintStream;
import java.text.Collator;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
/**
* Static utility methods for dealing with databases and {@link Cursor}s.
*/
public class DatabaseUtils {
private static final String TAG = "DatabaseUtils";
private static final boolean DEBUG = false;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_SELECT = 1;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_UPDATE = 2;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_ATTACH = 3;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_BEGIN = 4;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_COMMIT = 5;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_ABORT = 6;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_PRAGMA = 7;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_DDL = 8;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_UNPREPARED = 9;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_OTHER = 99;
/**
* Special function for writing an exception result at the header of
* a parcel, to be used when returning an exception from a transaction.
* exception will be re-thrown by the function in another process
* @param reply Parcel to write to
* @param e The Exception to be written.
* @see Parcel#writeNoException
* @see Parcel#writeException
*/
public static final void writeExceptionToParcel(Parcel reply, Exception e) {
int code = 0;
boolean logException = true;
if (e instanceof FileNotFoundException) {
code = 1;
logException = false;
} else if (e instanceof IllegalArgumentException) {
code = 2;
} else if (e instanceof UnsupportedOperationException) {
code = 3;
} else if (e instanceof SQLiteAbortException) {
code = 4;
} else if (e instanceof SQLiteConstraintException) {
code = 5;
} else if (e instanceof SQLiteDatabaseCorruptException) {
code = 6;
} else if (e instanceof SQLiteFullException) {
code = 7;
} else if (e instanceof SQLiteDiskIOException) {
code = 8;
} else if (e instanceof SQLiteException) {
code = 9;
} else if (e instanceof OperationApplicationException) {
code = 10;
} else if (e instanceof OperationCanceledException) {
code = 11;
logException = false;
} else {
reply.writeException(e);
Log.e(TAG, "Writing exception to parcel", e);
return;
}
reply.writeInt(code);
reply.writeString(e.getMessage());
if (logException) {
Log.e(TAG, "Writing exception to parcel", e);
}
}
/**
* Special function for reading an exception result from the header of
* a parcel, to be used after receiving the result of a transaction. This
* will throw the exception for you if it had been written to the Parcel,
* otherwise return and let you read the normal result data from the Parcel.
* @param reply Parcel to read from
* @see Parcel#writeNoException
* @see Parcel#readException
*/
// public static final void readExceptionFromParcel(Parcel reply) {
// int code = reply.readExceptionCode();
// if (code == 0) return;
// String msg = reply.readString();
// DatabaseUtils.readExceptionFromParcel(reply, msg, code);
// }
//
// public static void readExceptionWithFileNotFoundExceptionFromParcel(
// Parcel reply) throws FileNotFoundException {
// int code = reply.readExceptionCode();
// if (code == 0) return;
// String msg = reply.readString();
// if (code == 1) {
// throw new FileNotFoundException(msg);
// } else {
// DatabaseUtils.readExceptionFromParcel(reply, msg, code);
// }
// }
//
// public static void readExceptionWithOperationApplicationExceptionFromParcel(
// Parcel reply) throws OperationApplicationException {
// int code = reply.readExceptionCode();
// if (code == 0) return;
// String msg = reply.readString();
// if (code == 10) {
// throw new OperationApplicationException(msg);
// } else {
// DatabaseUtils.readExceptionFromParcel(reply, msg, code);
// }
// }
private static final void readExceptionFromParcel(Parcel reply, String msg, int code) {
switch (code) {
case 2:
throw new IllegalArgumentException(msg);
case 3:
throw new UnsupportedOperationException(msg);
case 4:
throw new SQLiteAbortException(msg);
case 5:
throw new SQLiteConstraintException(msg);
case 6:
throw new SQLiteDatabaseCorruptException(msg);
case 7:
throw new SQLiteFullException(msg);
case 8:
throw new SQLiteDiskIOException(msg);
case 9:
throw new SQLiteException(msg);
case 11:
throw new OperationCanceledException(msg);
default:
reply.readException(code, msg);
}
}
/**
* Binds the given Object to the given SQLiteProgram using the proper
* typing. For example, bind numbers as longs/doubles, and everything else
* as a string by call toString() on it.
*
* @param prog the program to bind the object to
* @param index the 1-based index to bind at
* @param value the value to bind
*/
public static void bindObjectToProgram(SQLiteProgram prog, int index,
Object value) {
if (value == null) {
prog.bindNull(index);
} else if (value instanceof Double || value instanceof Float) {
prog.bindDouble(index, ((Number)value).doubleValue());
} else if (value instanceof Number) {
prog.bindLong(index, ((Number)value).longValue());
} else if (value instanceof Boolean) {
Boolean bool = (Boolean)value;
if (bool) {
prog.bindLong(index, 1);
} else {
prog.bindLong(index, 0);
}
} else if (value instanceof byte[]){
prog.bindBlob(index, (byte[]) value);
} else {
prog.bindString(index, value.toString());
}
}
/**
* Returns data type of the given object's value.
*
* Returned values are
*
* - {@link Cursor#FIELD_TYPE_NULL}
* - {@link Cursor#FIELD_TYPE_INTEGER}
* - {@link Cursor#FIELD_TYPE_FLOAT}
* - {@link Cursor#FIELD_TYPE_STRING}
* - {@link Cursor#FIELD_TYPE_BLOB}
*
*
*
* @param obj the object whose value type is to be returned
* @return object value type
* @hide
*/
public static int getTypeOfObject(Object obj) {
if (obj == null) {
return Cursor.FIELD_TYPE_NULL;
} else if (obj instanceof byte[]) {
return Cursor.FIELD_TYPE_BLOB;
} else if (obj instanceof Float || obj instanceof Double) {
return Cursor.FIELD_TYPE_FLOAT;
} else if (obj instanceof Long || obj instanceof Integer
|| obj instanceof Short || obj instanceof Byte) {
return Cursor.FIELD_TYPE_INTEGER;
} else {
return Cursor.FIELD_TYPE_STRING;
}
}
/**
* Fills the specified cursor window by iterating over the contents of the cursor.
* The window is filled until the cursor is exhausted or the window runs out
* of space.
*
* The original position of the cursor is left unchanged by this operation.
*
* @param cursor The cursor that contains the data to put in the window.
* @param position The start position for filling the window.
* @param window The window to fill.
* @hide
*/
public static void cursorFillWindow(final Cursor cursor,
int position, final CursorWindow window) {
if (position < 0 || position >= cursor.getCount()) {
return;
}
final int oldPos = cursor.getPosition();
final int numColumns = cursor.getColumnCount();
window.clear();
window.setStartPosition(position);
window.setNumColumns(numColumns);
if (cursor.moveToPosition(position)) {
rowloop: do {
if (!window.allocRow()) {
break;
}
for (int i = 0; i < numColumns; i++) {
final int type = cursor.getType(i);
final boolean success;
switch (type) {
case Cursor.FIELD_TYPE_NULL:
success = window.putNull(position, i);
break;
case Cursor.FIELD_TYPE_INTEGER:
success = window.putLong(cursor.getLong(i), position, i);
break;
case Cursor.FIELD_TYPE_FLOAT:
success = window.putDouble(cursor.getDouble(i), position, i);
break;
case Cursor.FIELD_TYPE_BLOB: {
final byte[] value = cursor.getBlob(i);
success = value != null ? window.putBlob(value, position, i)
: window.putNull(position, i);
break;
}
default: // assume value is convertible to String
case Cursor.FIELD_TYPE_STRING: {
final String value = cursor.getString(i);
success = value != null ? window.putString(value, position, i)
: window.putNull(position, i);
break;
}
}
if (!success) {
window.freeLastRow();
break rowloop;
}
}
position += 1;
} while (cursor.moveToNext());
}
cursor.moveToPosition(oldPos);
}
/**
* Appends an SQL string to the given StringBuilder, including the opening
* and closing single quotes. Any single quotes internal to sqlString will
* be escaped.
*
* This method is deprecated because we want to encourage everyone
* to use the "?" binding form. However, when implementing a
* ContentProvider, one may want to add WHERE clauses that were
* not provided by the caller. Since "?" is a positional form,
* using it in this case could break the caller because the
* indexes would be shifted to accomodate the ContentProvider's
* internal bindings. In that case, it may be necessary to
* construct a WHERE clause manually. This method is useful for
* those cases.
*
* @param sb the StringBuilder that the SQL string will be appended to
* @param sqlString the raw string to be appended, which may contain single
* quotes
*/
public static void appendEscapedSQLString(StringBuilder sb, String sqlString) {
sb.append('\'');
if (sqlString.indexOf('\'') != -1) {
int length = sqlString.length();
for (int i = 0; i < length; i++) {
char c = sqlString.charAt(i);
if (c == '\'') {
sb.append('\'');
}
sb.append(c);
}
} else
sb.append(sqlString);
sb.append('\'');
}
/**
* SQL-escape a string.
*/
public static String sqlEscapeString(String value) {
StringBuilder escaper = new StringBuilder();
DatabaseUtils.appendEscapedSQLString(escaper, value);
return escaper.toString();
}
/**
* Appends an Object to an SQL string with the proper escaping, etc.
*/
public static final void appendValueToSql(StringBuilder sql, Object value) {
if (value == null) {
sql.append("NULL");
} else if (value instanceof Boolean) {
Boolean bool = (Boolean)value;
if (bool) {
sql.append('1');
} else {
sql.append('0');
}
} else {
appendEscapedSQLString(sql, value.toString());
}
}
/**
* Concatenates two SQL WHERE clauses, handling empty or null values.
*/
public static String concatenateWhere(String a, String b) {
if (TextUtils.isEmpty(a)) {
return b;
}
if (TextUtils.isEmpty(b)) {
return a;
}
return "(" + a + ") AND (" + b + ")";
}
/**
* return the collation key
* @param name
* @return the collation key
*/
public static String getCollationKey(String name) {
byte [] arr = getCollationKeyInBytes(name);
try {
return new String(arr, 0, getKeyLen(arr), "ISO8859_1");
} catch (Exception ex) {
return "";
}
}
/**
* return the collation key in hex format
* @param name
* @return the collation key in hex format
*/
public static String getHexCollationKey(String name) {
byte[] arr = getCollationKeyInBytes(name);
char[] keys = encodeHex(arr);
return new String(keys, 0, getKeyLen(arr) * 2);
}
/**
* Used building output as Hex
*/
private static final char[] DIGITS = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
private static char[] encodeHex(byte[] input) {
int l = input.length;
char[] out = new char[l << 1];
// two characters form the hex value.
for (int i = 0, j = 0; i < l; i++) {
out[j++] = DIGITS[(0xF0 & input[i]) >>> 4 ];
out[j++] = DIGITS[ 0x0F & input[i] ];
}
return out;
}
private static int getKeyLen(byte[] arr) {
if (arr[arr.length - 1] != 0) {
return arr.length;
} else {
// remove zero "termination"
return arr.length-1;
}
}
private static byte[] getCollationKeyInBytes(String name) {
if (mColl == null) {
mColl = Collator.getInstance();
mColl.setStrength(Collator.PRIMARY);
}
return mColl.getCollationKey(name).toByteArray();
}
private static Collator mColl = null;
/**
* Prints the contents of a Cursor to System.out. The position is restored
* after printing.
*
* @param cursor the cursor to print
*/
public static void dumpCursor(Cursor cursor) {
dumpCursor(cursor, System.out);
}
/**
* Prints the contents of a Cursor to a PrintSteam. The position is restored
* after printing.
*
* @param cursor the cursor to print
* @param stream the stream to print to
*/
public static void dumpCursor(Cursor cursor, PrintStream stream) {
stream.println(">>>>> Dumping cursor " + cursor);
if (cursor != null) {
int startPos = cursor.getPosition();
cursor.moveToPosition(-1);
while (cursor.moveToNext()) {
dumpCurrentRow(cursor, stream);
}
cursor.moveToPosition(startPos);
}
stream.println("<<<<<");
}
/**
* Prints the contents of a Cursor to a StringBuilder. The position
* is restored after printing.
*
* @param cursor the cursor to print
* @param sb the StringBuilder to print to
*/
public static void dumpCursor(Cursor cursor, StringBuilder sb) {
sb.append(">>>>> Dumping cursor " + cursor + "\n");
if (cursor != null) {
int startPos = cursor.getPosition();
cursor.moveToPosition(-1);
while (cursor.moveToNext()) {
dumpCurrentRow(cursor, sb);
}
cursor.moveToPosition(startPos);
}
sb.append("<<<<<\n");
}
/**
* Prints the contents of a Cursor to a String. The position is restored
* after printing.
*
* @param cursor the cursor to print
* @return a String that contains the dumped cursor
*/
public static String dumpCursorToString(Cursor cursor) {
StringBuilder sb = new StringBuilder();
dumpCursor(cursor, sb);
return sb.toString();
}
/**
* Prints the contents of a Cursor's current row to System.out.
*
* @param cursor the cursor to print from
*/
public static void dumpCurrentRow(Cursor cursor) {
dumpCurrentRow(cursor, System.out);
}
/**
* Prints the contents of a Cursor's current row to a PrintSteam.
*
* @param cursor the cursor to print
* @param stream the stream to print to
*/
public static void dumpCurrentRow(Cursor cursor, PrintStream stream) {
String[] cols = cursor.getColumnNames();
stream.println("" + cursor.getPosition() + " {");
int length = cols.length;
for (int i = 0; i< length; i++) {
String value;
try {
value = cursor.getString(i);
} catch (SQLiteException e) {
// assume that if the getString threw this exception then the column is not
// representable by a string, e.g. it is a BLOB.
value = "";
}
stream.println(" " + cols[i] + '=' + value);
}
stream.println("}");
}
/**
* Prints the contents of a Cursor's current row to a StringBuilder.
*
* @param cursor the cursor to print
* @param sb the StringBuilder to print to
*/
public static void dumpCurrentRow(Cursor cursor, StringBuilder sb) {
String[] cols = cursor.getColumnNames();
sb.append("" + cursor.getPosition() + " {\n");
int length = cols.length;
for (int i = 0; i < length; i++) {
String value;
try {
value = cursor.getString(i);
} catch (SQLiteException e) {
// assume that if the getString threw this exception then the column is not
// representable by a string, e.g. it is a BLOB.
value = "";
}
sb.append(" " + cols[i] + '=' + value + "\n");
}
sb.append("}\n");
}
/**
* Dump the contents of a Cursor's current row to a String.
*
* @param cursor the cursor to print
* @return a String that contains the dumped cursor row
*/
public static String dumpCurrentRowToString(Cursor cursor) {
StringBuilder sb = new StringBuilder();
dumpCurrentRow(cursor, sb);
return sb.toString();
}
/**
* Reads a String out of a field in a Cursor and writes it to a Map.
*
* @param cursor The cursor to read from
* @param field The TEXT field to read
* @param values The {@link ContentValues} to put the value into, with the field as the key
*/
public static void cursorStringToContentValues(Cursor cursor, String field,
ContentValues values) {
cursorStringToContentValues(cursor, field, values, field);
}
/**
* Reads a String out of a field in a Cursor and writes it to an InsertHelper.
*
* @param cursor The cursor to read from
* @param field The TEXT field to read
* @param inserter The InsertHelper to bind into
* @param index the index of the bind entry in the InsertHelper
*/
public static void cursorStringToInsertHelper(Cursor cursor, String field,
InsertHelper inserter, int index) {
inserter.bind(index, cursor.getString(cursor.getColumnIndexOrThrow(field)));
}
/**
* Reads a String out of a field in a Cursor and writes it to a Map.
*
* @param cursor The cursor to read from
* @param field The TEXT field to read
* @param values The {@link ContentValues} to put the value into, with the field as the key
* @param key The key to store the value with in the map
*/
public static void cursorStringToContentValues(Cursor cursor, String field,
ContentValues values, String key) {
values.put(key, cursor.getString(cursor.getColumnIndexOrThrow(field)));
}
/**
* Reads an Integer out of a field in a Cursor and writes it to a Map.
*
* @param cursor The cursor to read from
* @param field The INTEGER field to read
* @param values The {@link ContentValues} to put the value into, with the field as the key
*/
public static void cursorIntToContentValues(Cursor cursor, String field, ContentValues values) {
cursorIntToContentValues(cursor, field, values, field);
}
/**
* Reads a Integer out of a field in a Cursor and writes it to a Map.
*
* @param cursor The cursor to read from
* @param field The INTEGER field to read
* @param values The {@link ContentValues} to put the value into, with the field as the key
* @param key The key to store the value with in the map
*/
public static void cursorIntToContentValues(Cursor cursor, String field, ContentValues values,
String key) {
int colIndex = cursor.getColumnIndex(field);
if (!cursor.isNull(colIndex)) {
values.put(key, cursor.getInt(colIndex));
} else {
values.put(key, (Integer) null);
}
}
/**
* Reads a Long out of a field in a Cursor and writes it to a Map.
*
* @param cursor The cursor to read from
* @param field The INTEGER field to read
* @param values The {@link ContentValues} to put the value into, with the field as the key
*/
public static void cursorLongToContentValues(Cursor cursor, String field, ContentValues values)
{
cursorLongToContentValues(cursor, field, values, field);
}
/**
* Reads a Long out of a field in a Cursor and writes it to a Map.
*
* @param cursor The cursor to read from
* @param field The INTEGER field to read
* @param values The {@link ContentValues} to put the value into
* @param key The key to store the value with in the map
*/
public static void cursorLongToContentValues(Cursor cursor, String field, ContentValues values,
String key) {
int colIndex = cursor.getColumnIndex(field);
if (!cursor.isNull(colIndex)) {
Long value = Long.valueOf(cursor.getLong(colIndex));
values.put(key, value);
} else {
values.put(key, (Long) null);
}
}
/**
* Reads a Double out of a field in a Cursor and writes it to a Map.
*
* @param cursor The cursor to read from
* @param field The REAL field to read
* @param values The {@link ContentValues} to put the value into
*/
public static void cursorDoubleToCursorValues(Cursor cursor, String field, ContentValues values)
{
cursorDoubleToContentValues(cursor, field, values, field);
}
/**
* Reads a Double out of a field in a Cursor and writes it to a Map.
*
* @param cursor The cursor to read from
* @param field The REAL field to read
* @param values The {@link ContentValues} to put the value into
* @param key The key to store the value with in the map
*/
public static void cursorDoubleToContentValues(Cursor cursor, String field,
ContentValues values, String key) {
int colIndex = cursor.getColumnIndex(field);
if (!cursor.isNull(colIndex)) {
values.put(key, cursor.getDouble(colIndex));
} else {
values.put(key, (Double) null);
}
}
/**
* Read the entire contents of a cursor row and store them in a ContentValues.
*
* @param cursor the cursor to read from.
* @param values the {@link ContentValues} to put the row into.
*/
public static void cursorRowToContentValues(Cursor cursor, ContentValues values) {
String[] columns = cursor.getColumnNames();
int length = columns.length;
for (int i = 0; i < length; i++) {
if (cursor.getType(i) == Cursor.FIELD_TYPE_BLOB) {
values.put(columns[i], cursor.getBlob(i));
} else {
values.put(columns[i], cursor.getString(i));
}
}
}
/**
* Picks a start position for {@link Cursor#fillWindow} such that the
* window will contain the requested row and a useful range of rows
* around it.
*
* When the data set is too large to fit in a cursor window, seeking the
* cursor can become a very expensive operation since we have to run the
* query again when we move outside the bounds of the current window.
*
* We try to choose a start position for the cursor window such that
* 1/3 of the window's capacity is used to hold rows before the requested
* position and 2/3 of the window's capacity is used to hold rows after the
* requested position.
*
* @param cursorPosition The row index of the row we want to get.
* @param cursorWindowCapacity The estimated number of rows that can fit in
* a cursor window, or 0 if unknown.
* @return The recommended start position, always less than or equal to
* the requested row.
* @hide
*/
public static int cursorPickFillWindowStartPosition(
int cursorPosition, int cursorWindowCapacity) {
return Math.max(cursorPosition - cursorWindowCapacity / 3, 0);
}
/**
* Query the table for the number of rows in the table.
* @param db the database the table is in
* @param table the name of the table to query
* @return the number of rows in the table
*/
public static long queryNumEntries(SQLiteDatabase db, String table) {
return queryNumEntries(db, table, null, null);
}
/**
* Query the table for the number of rows in the table.
* @param db the database the table is in
* @param table the name of the table to query
* @param selection A filter declaring which rows to return,
* formatted as an SQL WHERE clause (excluding the WHERE itself).
* Passing null will count all rows for the given table
* @return the number of rows in the table filtered by the selection
*/
public static long queryNumEntries(SQLiteDatabase db, String table, String selection) {
return queryNumEntries(db, table, selection, null);
}
/**
* Query the table for the number of rows in the table.
* @param db the database the table is in
* @param table the name of the table to query
* @param selection A filter declaring which rows to return,
* formatted as an SQL WHERE clause (excluding the WHERE itself).
* Passing null will count 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.
* @return the number of rows in the table filtered by the selection
*/
public static long queryNumEntries(SQLiteDatabase db, String table, String selection,
String[] selectionArgs) {
String s = (!TextUtils.isEmpty(selection)) ? " where " + selection : "";
return longForQuery(db, "select count(*) from " + table + s,
selectionArgs);
}
/**
* Query the table to check whether a table is empty or not
* @param db the database the table is in
* @param table the name of the table to query
* @return True if the table is empty
* @hide
*/
public static boolean queryIsEmpty(SQLiteDatabase db, String table) {
long isEmpty = longForQuery(db, "select exists(select 1 from " + table + ")", null);
return isEmpty == 0;
}
/**
* Utility method to run the query on the db and return the value in the
* first column of the first row.
*/
public static long longForQuery(SQLiteDatabase db, String query, String[] selectionArgs) {
SQLiteStatement prog = db.compileStatement(query);
try {
return longForQuery(prog, selectionArgs);
} finally {
prog.close();
}
}
/**
* Utility method to run the pre-compiled query and return the value in the
* first column of the first row.
*/
public static long longForQuery(SQLiteStatement prog, String[] selectionArgs) {
prog.bindAllArgsAsStrings(selectionArgs);
return prog.simpleQueryForLong();
}
/**
* Utility method to run the query on the db and return the value in the
* first column of the first row.
*/
public static String stringForQuery(SQLiteDatabase db, String query, String[] selectionArgs) {
SQLiteStatement prog = db.compileStatement(query);
try {
return stringForQuery(prog, selectionArgs);
} finally {
prog.close();
}
}
/**
* Utility method to run the pre-compiled query and return the value in the
* first column of the first row.
*/
public static String stringForQuery(SQLiteStatement prog, String[] selectionArgs) {
prog.bindAllArgsAsStrings(selectionArgs);
return prog.simpleQueryForString();
}
/**
* Utility method to run the query on the db and return the blob value in the
* first column of the first row.
*
* @return A read-only file descriptor for a copy of the blob value.
*/
public static ParcelFileDescriptor blobFileDescriptorForQuery(SQLiteDatabase db,
String query, String[] selectionArgs) {
SQLiteStatement prog = db.compileStatement(query);
try {
return blobFileDescriptorForQuery(prog, selectionArgs);
} finally {
prog.close();
}
}
/**
* Utility method to run the pre-compiled query and return the blob value in the
* first column of the first row.
*
* @return A read-only file descriptor for a copy of the blob value.
*/
public static ParcelFileDescriptor blobFileDescriptorForQuery(SQLiteStatement prog,
String[] selectionArgs) {
prog.bindAllArgsAsStrings(selectionArgs);
return prog.simpleQueryForBlobFileDescriptor();
}
/**
* Reads a String out of a column in a Cursor and writes it to a ContentValues.
* Adds nothing to the ContentValues if the column isn't present or if its value is null.
*
* @param cursor The cursor to read from
* @param column The column to read
* @param values The {@link ContentValues} to put the value into
*/
public static void cursorStringToContentValuesIfPresent(Cursor cursor, ContentValues values,
String column) {
final int index = cursor.getColumnIndex(column);
if (index != -1 && !cursor.isNull(index)) {
values.put(column, cursor.getString(index));
}
}
/**
* Reads a Long out of a column in a Cursor and writes it to a ContentValues.
* Adds nothing to the ContentValues if the column isn't present or if its value is null.
*
* @param cursor The cursor to read from
* @param column The column to read
* @param values The {@link ContentValues} to put the value into
*/
public static void cursorLongToContentValuesIfPresent(Cursor cursor, ContentValues values,
String column) {
final int index = cursor.getColumnIndex(column);
if (index != -1 && !cursor.isNull(index)) {
values.put(column, cursor.getLong(index));
}
}
/**
* Reads a Short out of a column in a Cursor and writes it to a ContentValues.
* Adds nothing to the ContentValues if the column isn't present or if its value is null.
*
* @param cursor The cursor to read from
* @param column The column to read
* @param values The {@link ContentValues} to put the value into
*/
public static void cursorShortToContentValuesIfPresent(Cursor cursor, ContentValues values,
String column) {
final int index = cursor.getColumnIndex(column);
if (index != -1 && !cursor.isNull(index)) {
values.put(column, cursor.getShort(index));
}
}
/**
* Reads a Integer out of a column in a Cursor and writes it to a ContentValues.
* Adds nothing to the ContentValues if the column isn't present or if its value is null.
*
* @param cursor The cursor to read from
* @param column The column to read
* @param values The {@link ContentValues} to put the value into
*/
public static void cursorIntToContentValuesIfPresent(Cursor cursor, ContentValues values,
String column) {
final int index = cursor.getColumnIndex(column);
if (index != -1 && !cursor.isNull(index)) {
values.put(column, cursor.getInt(index));
}
}
/**
* Reads a Float out of a column in a Cursor and writes it to a ContentValues.
* Adds nothing to the ContentValues if the column isn't present or if its value is null.
*
* @param cursor The cursor to read from
* @param column The column to read
* @param values The {@link ContentValues} to put the value into
*/
public static void cursorFloatToContentValuesIfPresent(Cursor cursor, ContentValues values,
String column) {
final int index = cursor.getColumnIndex(column);
if (index != -1 && !cursor.isNull(index)) {
values.put(column, cursor.getFloat(index));
}
}
/**
* Reads a Double out of a column in a Cursor and writes it to a ContentValues.
* Adds nothing to the ContentValues if the column isn't present or if its value is null.
*
* @param cursor The cursor to read from
* @param column The column to read
* @param values The {@link ContentValues} to put the value into
*/
public static void cursorDoubleToContentValuesIfPresent(Cursor cursor, ContentValues values,
String column) {
final int index = cursor.getColumnIndex(column);
if (index != -1 && !cursor.isNull(index)) {
values.put(column, cursor.getDouble(index));
}
}
/**
* This class allows users to do multiple inserts into a table using
* the same statement.
*
* This class is not thread-safe.
*
*
* @deprecated Use {@link SQLiteStatement} instead.
*/
@Deprecated
public static class InsertHelper {
private final SQLiteDatabase mDb;
private final String mTableName;
private HashMap mColumns;
private String mInsertSQL = null;
private SQLiteStatement mInsertStatement = null;
private SQLiteStatement mReplaceStatement = null;
private SQLiteStatement mPreparedStatement = null;
/**
* {@hide}
*
* These are the columns returned by sqlite's "PRAGMA
* table_info(...)" command that we depend on.
*/
public static final int TABLE_INFO_PRAGMA_COLUMNNAME_INDEX = 1;
/**
* This field was accidentally exposed in earlier versions of the platform
* so we can hide it but we can't remove it.
*
* @hide
*/
public static final int TABLE_INFO_PRAGMA_DEFAULT_INDEX = 4;
/**
* @param db the SQLiteDatabase to insert into
* @param tableName the name of the table to insert into
*/
public InsertHelper(SQLiteDatabase db, String tableName) {
mDb = db;
mTableName = tableName;
}
private void buildSQL() throws SQLException {
StringBuilder sb = new StringBuilder(128);
sb.append("INSERT INTO ");
sb.append(mTableName);
sb.append(" (");
StringBuilder sbv = new StringBuilder(128);
sbv.append("VALUES (");
int i = 1;
Cursor cur = null;
try {
cur = mDb.rawQuery("PRAGMA table_info(" + mTableName + ")", null);
mColumns = new HashMap(cur.getCount());
while (cur.moveToNext()) {
String columnName = cur.getString(TABLE_INFO_PRAGMA_COLUMNNAME_INDEX);
String defaultValue = cur.getString(TABLE_INFO_PRAGMA_DEFAULT_INDEX);
mColumns.put(columnName, i);
sb.append("'");
sb.append(columnName);
sb.append("'");
if (defaultValue == null) {
sbv.append("?");
} else {
sbv.append("COALESCE(?, ");
sbv.append(defaultValue);
sbv.append(")");
}
sb.append(i == cur.getCount() ? ") " : ", ");
sbv.append(i == cur.getCount() ? ");" : ", ");
++i;
}
} finally {
if (cur != null) cur.close();
}
sb.append(sbv);
mInsertSQL = sb.toString();
if (DEBUG) Log.v(TAG, "insert statement is " + mInsertSQL);
}
private SQLiteStatement getStatement(boolean allowReplace) throws SQLException {
if (allowReplace) {
if (mReplaceStatement == null) {
if (mInsertSQL == null) buildSQL();
// chop "INSERT" off the front and prepend "INSERT OR REPLACE" instead.
String replaceSQL = "INSERT OR REPLACE" + mInsertSQL.substring(6);
mReplaceStatement = mDb.compileStatement(replaceSQL);
}
return mReplaceStatement;
} else {
if (mInsertStatement == null) {
if (mInsertSQL == null) buildSQL();
mInsertStatement = mDb.compileStatement(mInsertSQL);
}
return mInsertStatement;
}
}
/**
* Performs an insert, adding a new row with the given values.
*
* @param values the set of values with which to populate the
* new row
* @param allowReplace if true, the statement does "INSERT OR
* REPLACE" instead of "INSERT", silently deleting any
* previously existing rows that would cause a conflict
*
* @return the row ID of the newly inserted row, or -1 if an
* error occurred
*/
private long insertInternal(ContentValues values, boolean allowReplace) {
// Start a transaction even though we don't really need one.
// This is to help maintain compatibility with applications that
// access InsertHelper from multiple threads even though they never should have.
// The original code used to lock the InsertHelper itself which was prone
// to deadlocks. Starting a transaction achieves the same mutual exclusion
// effect as grabbing a lock but without the potential for deadlocks.
mDb.beginTransactionNonExclusive();
try {
SQLiteStatement stmt = getStatement(allowReplace);
stmt.clearBindings();
if (DEBUG) Log.v(TAG, "--- inserting in table " + mTableName);
for (Map.Entry e: values.valueSet()) {
final String key = e.getKey();
int i = getColumnIndex(key);
DatabaseUtils.bindObjectToProgram(stmt, i, e.getValue());
if (DEBUG) {
Log.v(TAG, "binding " + e.getValue() + " to column " +
i + " (" + key + ")");
}
}
long result = stmt.executeInsert();
mDb.setTransactionSuccessful();
return result;
} catch (SQLException e) {
Log.e(TAG, "Error inserting " + values + " into table " + mTableName, e);
return -1;
} finally {
mDb.endTransaction();
}
}
/**
* Returns the index of the specified column. This is index is suitagble for use
* in calls to bind().
* @param key the column name
* @return the index of the column
*/
public int getColumnIndex(String key) {
getStatement(false);
final Integer index = mColumns.get(key);
if (index == null) {
throw new IllegalArgumentException("column '" + key + "' is invalid");
}
return index;
}
/**
* Bind the value to an index. A prepareForInsert() or prepareForReplace()
* without a matching execute() must have already have been called.
* @param index the index of the slot to which to bind
* @param value the value to bind
*/
public void bind(int index, double value) {
mPreparedStatement.bindDouble(index, value);
}
/**
* Bind the value to an index. A prepareForInsert() or prepareForReplace()
* without a matching execute() must have already have been called.
* @param index the index of the slot to which to bind
* @param value the value to bind
*/
public void bind(int index, float value) {
mPreparedStatement.bindDouble(index, value);
}
/**
* Bind the value to an index. A prepareForInsert() or prepareForReplace()
* without a matching execute() must have already have been called.
* @param index the index of the slot to which to bind
* @param value the value to bind
*/
public void bind(int index, long value) {
mPreparedStatement.bindLong(index, value);
}
/**
* Bind the value to an index. A prepareForInsert() or prepareForReplace()
* without a matching execute() must have already have been called.
* @param index the index of the slot to which to bind
* @param value the value to bind
*/
public void bind(int index, int value) {
mPreparedStatement.bindLong(index, value);
}
/**
* Bind the value to an index. A prepareForInsert() or prepareForReplace()
* without a matching execute() must have already have been called.
* @param index the index of the slot to which to bind
* @param value the value to bind
*/
public void bind(int index, boolean value) {
mPreparedStatement.bindLong(index, value ? 1 : 0);
}
/**
* Bind null to an index. A prepareForInsert() or prepareForReplace()
* without a matching execute() must have already have been called.
* @param index the index of the slot to which to bind
*/
public void bindNull(int index) {
mPreparedStatement.bindNull(index);
}
/**
* Bind the value to an index. A prepareForInsert() or prepareForReplace()
* without a matching execute() must have already have been called.
* @param index the index of the slot to which to bind
* @param value the value to bind
*/
public void bind(int index, byte[] value) {
if (value == null) {
mPreparedStatement.bindNull(index);
} else {
mPreparedStatement.bindBlob(index, value);
}
}
/**
* Bind the value to an index. A prepareForInsert() or prepareForReplace()
* without a matching execute() must have already have been called.
* @param index the index of the slot to which to bind
* @param value the value to bind
*/
public void bind(int index, String value) {
if (value == null) {
mPreparedStatement.bindNull(index);
} else {
mPreparedStatement.bindString(index, value);
}
}
/**
* Performs an insert, adding a new row with the given values.
* If the table contains conflicting rows, an error is
* returned.
*
* @param values the set of values with which to populate the
* new row
*
* @return the row ID of the newly inserted row, or -1 if an
* error occurred
*/
public long insert(ContentValues values) {
return insertInternal(values, false);
}
/**
* Execute the previously prepared insert or replace using the bound values
* since the last call to prepareForInsert or prepareForReplace.
*
* Note that calling bind() and then execute() is not thread-safe. The only thread-safe
* way to use this class is to call insert() or replace().
*
* @return the row ID of the newly inserted row, or -1 if an
* error occurred
*/
public long execute() {
if (mPreparedStatement == null) {
throw new IllegalStateException("you must prepare this inserter before calling "
+ "execute");
}
try {
if (DEBUG) Log.v(TAG, "--- doing insert or replace in table " + mTableName);
return mPreparedStatement.executeInsert();
} catch (SQLException e) {
Log.e(TAG, "Error executing InsertHelper with table " + mTableName, e);
return -1;
} finally {
// you can only call this once per prepare
mPreparedStatement = null;
}
}
/**
* Prepare the InsertHelper for an insert. The pattern for this is:
*
* - prepareForInsert()
*
- bind(index, value);
*
- bind(index, value);
*
- ...
*
- bind(index, value);
*
- execute();
*
*/
public void prepareForInsert() {
mPreparedStatement = getStatement(false);
mPreparedStatement.clearBindings();
}
/**
* Prepare the InsertHelper for a replace. The pattern for this is:
*
* - prepareForReplace()
*
- bind(index, value);
*
- bind(index, value);
*
- ...
*
- bind(index, value);
*
- execute();
*
*/
public void prepareForReplace() {
mPreparedStatement = getStatement(true);
mPreparedStatement.clearBindings();
}
/**
* Performs an insert, adding a new row with the given values.
* If the table contains conflicting rows, they are deleted
* and replaced with the new row.
*
* @param values the set of values with which to populate the
* new row
*
* @return the row ID of the newly inserted row, or -1 if an
* error occurred
*/
public long replace(ContentValues values) {
return insertInternal(values, true);
}
/**
* Close this object and release any resources associated with
* it. The behavior of calling insert() after
* calling this method is undefined.
*/
public void close() {
if (mInsertStatement != null) {
mInsertStatement.close();
mInsertStatement = null;
}
if (mReplaceStatement != null) {
mReplaceStatement.close();
mReplaceStatement = null;
}
mInsertSQL = null;
mColumns = null;
}
}
/**
* Creates a db and populates it with the sql statements in sqlStatements.
*
* @param context the context to use to create the db
* @param dbName the name of the db to create
* @param dbVersion the version to set on the db
* @param sqlStatements the statements to use to populate the db. This should be a single string
* of the form returned by sqlite3's .dump command (statements separated by
* semicolons)
*/
static public void createDbFromSqlStatements(
Context context, String dbName, int dbVersion, String sqlStatements) {
File f = context.getDatabasePath(dbName);
f.getParentFile().mkdirs();
SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(f, null);
// TODO: this is not quite safe since it assumes that all semicolons at the end of a line
// terminate statements. It is possible that a text field contains ;\n. We will have to fix
// this if that turns out to be a problem.
String[] statements = TextUtils.split(sqlStatements, ";\n");
for (String statement : statements) {
if (TextUtils.isEmpty(statement)) continue;
db.execSQL(statement);
}
db.setVersion(dbVersion);
db.close();
}
/**
* Returns one of the following which represent the type of the given SQL statement.
*
* - {@link #STATEMENT_SELECT}
* - {@link #STATEMENT_UPDATE}
* - {@link #STATEMENT_ATTACH}
* - {@link #STATEMENT_BEGIN}
* - {@link #STATEMENT_COMMIT}
* - {@link #STATEMENT_ABORT}
* - {@link #STATEMENT_OTHER}
*
* @param sql the SQL statement whose type is returned by this method
* @return one of the values listed above
*/
public static int getSqlStatementType(String sql) {
sql = sql.trim();
if (sql.length() < 3) {
return STATEMENT_OTHER;
}
String prefixSql = sql.substring(0, 3).toUpperCase(Locale.ROOT);
if (prefixSql.equals("SEL")) {
return STATEMENT_SELECT;
} else if (prefixSql.equals("INS") ||
prefixSql.equals("UPD") ||
prefixSql.equals("REP") ||
prefixSql.equals("DEL")) {
return STATEMENT_UPDATE;
} else if (prefixSql.equals("ATT")) {
return STATEMENT_ATTACH;
} else if (prefixSql.equals("COM")) {
return STATEMENT_COMMIT;
} else if (prefixSql.equals("END")) {
return STATEMENT_COMMIT;
} else if (prefixSql.equals("ROL")) {
return STATEMENT_ABORT;
} else if (prefixSql.equals("BEG")) {
return STATEMENT_BEGIN;
} else if (prefixSql.equals("PRA")) {
return STATEMENT_PRAGMA;
} else if (prefixSql.equals("CRE") || prefixSql.equals("DRO") ||
prefixSql.equals("ALT")) {
return STATEMENT_DDL;
} else if (prefixSql.equals("ANA") || prefixSql.equals("DET")) {
return STATEMENT_UNPREPARED;
}
return STATEMENT_OTHER;
}
/**
* Appends one set of selection args to another. This is useful when adding a selection
* argument to a user provided set.
*/
public static String[] appendSelectionArgs(String[] originalValues, String[] newValues) {
if (originalValues == null || originalValues.length == 0) {
return newValues;
}
String[] result = new String[originalValues.length + newValues.length ];
System.arraycopy(originalValues, 0, result, 0, originalValues.length);
System.arraycopy(newValues, 0, result, originalValues.length, newValues.length);
return result;
}
/**
* Returns column index of "_id" column, or -1 if not found.
* @hide
*/
public static int findRowIdColumnIndex(String[] columnNames) {
int length = columnNames.length;
for (int i = 0; i < length; i++) {
if (columnNames[i].equals("_id")) {
return i;
}
}
return -1;
}
}