SQLiteCursor - Android SDK

Added in API level 1

public class

SQLiteCursor

extends AbstractWindowedCursor

java.lang.Object
↳	android.database.AbstractCursor
	↳	android.database.AbstractWindowedCursor
		↳	android.database.sqlite.SQLiteCursor

Class Overview

A Cursor implementation that exposes results from a query on a SQLiteDatabase. SQLiteCursor is not internally synchronized so code using a SQLiteCursor from multiple threads should perform its own synchronization when using the SQLiteCursor.

Summary

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Inherited Constants

From interface android.database.Cursor

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Inherited Fields

From class android.database.AbstractWindowedCursor

From class android.database.AbstractCursor

Public Constructors
	SQLiteCursor(SQLiteDatabase db, SQLiteCursorDriver driver, String editTable, SQLiteQuery query) This constructor was deprecated in API level 11. use `SQLiteCursor(SQLiteCursorDriver, String, SQLiteQuery)` instead
	SQLiteCursor(SQLiteCursorDriver driver, String editTable, SQLiteQuery query) Execute a query and provide access to its result set through a Cursor interface.

Public Methods
void	close() Closes the Cursor, releasing all of its resources and making it completely invalid.
void	deactivate() Deactivates the Cursor, making all calls on it fail until `requery()` is called.
int	getColumnIndex(String columnName) Returns the zero-based index for the given column name, or -1 if the column doesn't exist.
String[]	getColumnNames() Returns a string array holding the names of all of the columns in the result set in the order in which they were listed in the result.
int	getCount() Returns the numbers of rows in the cursor.
SQLiteDatabase	getDatabase() Get the database that this cursor is associated with.
boolean	onMove(int oldPosition, int newPosition) This function is called every time the cursor is successfully scrolled to a new position, giving the subclass a chance to update any state it may have.
boolean	requery() Performs the query that created the cursor again, refreshing its contents.
void	setSelectionArguments(String[] selectionArgs) Changes the selection arguments.
void	setWindow(CursorWindow window) Sets a new cursor window for the cursor to use.

Protected Methods
void	finalize() Release the native resources, if they haven't been released yet.

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Inherited Methods

From class android.database.AbstractWindowedCursor

void	checkPosition() This function throws CursorIndexOutOfBoundsException if the cursor position is out of bounds.
void	copyStringToBuffer(int columnIndex, CharArrayBuffer buffer) Retrieves the requested column text and stores it in the buffer provided.
byte[]	getBlob(int columnIndex) Returns the value of the requested column as a byte array.
double	getDouble(int columnIndex) Returns the value of the requested column as a double.
float	getFloat(int columnIndex) Returns the value of the requested column as a float.
int	getInt(int columnIndex) Returns the value of the requested column as an int.
long	getLong(int columnIndex) Returns the value of the requested column as a long.
short	getShort(int columnIndex) Returns the value of the requested column as a short.
String	getString(int columnIndex) Returns the value of the requested column as a String.
int	getType(int columnIndex) Returns data type of the given column's value.
CursorWindow	getWindow() If the cursor is backed by a `CursorWindow`, returns a pre-filled window with the contents of the cursor, otherwise null.
boolean	hasWindow() Returns true if the cursor has an associated cursor window.
boolean	isBlob(int columnIndex) This method was deprecated in API level 11. Use `getType(int)`
boolean	isFloat(int columnIndex) This method was deprecated in API level 11. Use `getType(int)`
boolean	isLong(int columnIndex) This method was deprecated in API level 11. Use `getType(int)`
boolean	isNull(int columnIndex) Returns `true` if the value in the indicated column is null.
boolean	isString(int columnIndex) This method was deprecated in API level 11. Use `getType(int)`
void	setWindow(CursorWindow window) Sets a new cursor window for the cursor to use.

From class android.database.AbstractCursor

void	checkPosition() This function throws CursorIndexOutOfBoundsException if the cursor position is out of bounds.
void	close() Closes the Cursor, releasing all of its resources and making it completely invalid.
void	copyStringToBuffer(int columnIndex, CharArrayBuffer buffer) Retrieves the requested column text and stores it in the buffer provided.
void	deactivate() Deactivates the Cursor, making all calls on it fail until `requery()` is called.
void	fillWindow(int position, CursorWindow window) Copies cursor data into the window.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
byte[]	getBlob(int column) Returns the value of the requested column as a byte array.
int	getColumnCount() Return total number of columns
int	getColumnIndex(String columnName) Returns the zero-based index for the given column name, or -1 if the column doesn't exist.
int	getColumnIndexOrThrow(String columnName) Returns the zero-based index for the given column name, or throws `IllegalArgumentException` if the column doesn't exist.
String	getColumnName(int columnIndex) Returns the column name at the given zero-based column index.
abstract String[]	getColumnNames() Returns a string array holding the names of all of the columns in the result set in the order in which they were listed in the result.
abstract int	getCount() Returns the numbers of rows in the cursor.
abstract double	getDouble(int column) Returns the value of the requested column as a double.
Bundle	getExtras() Returns a bundle of extra values.
abstract float	getFloat(int column) Returns the value of the requested column as a float.
abstract int	getInt(int column) Returns the value of the requested column as an int.
abstract long	getLong(int column) Returns the value of the requested column as a long.
Uri	getNotificationUri() Return the URI at which notifications of changes in this Cursor's data will be delivered, as previously set by `setNotificationUri(ContentResolver, Uri)`.
final int	getPosition() Returns the current position of the cursor in the row set.
abstract short	getShort(int column) Returns the value of the requested column as a short.
abstract String	getString(int column) Returns the value of the requested column as a String.
int	getType(int column) Returns data type of the given column's value.
Object	getUpdatedField(int columnIndex) This method was deprecated in API level 11. Always returns null since Cursors do not support updating rows
boolean	getWantsAllOnMoveCalls() onMove() will only be called across processes if this method returns true.
CursorWindow	getWindow() If the cursor is backed by a `CursorWindow`, returns a pre-filled window with the contents of the cursor, otherwise null.
final boolean	isAfterLast() Returns whether the cursor is pointing to the position after the last row.
final boolean	isBeforeFirst() Returns whether the cursor is pointing to the position before the first row.
boolean	isClosed() return true if the cursor is closed
boolean	isFieldUpdated(int columnIndex) This method was deprecated in API level 11. Always returns false since Cursors do not support updating rows
final boolean	isFirst() Returns whether the cursor is pointing to the first row.
final boolean	isLast() Returns whether the cursor is pointing to the last row.
abstract boolean	isNull(int column) Returns `true` if the value in the indicated column is null.
final boolean	move(int offset) Move the cursor by a relative amount, forward or backward, from the current position.
final boolean	moveToFirst() Move the cursor to the first row.
final boolean	moveToLast() Move the cursor to the last row.
final boolean	moveToNext() Move the cursor to the next row.
final boolean	moveToPosition(int position) Move the cursor to an absolute position.
final boolean	moveToPrevious() Move the cursor to the previous row.
void	onChange(boolean selfChange) Subclasses must call this method when they finish committing updates to notify all observers.
boolean	onMove(int oldPosition, int newPosition) This function is called every time the cursor is successfully scrolled to a new position, giving the subclass a chance to update any state it may have.
void	registerContentObserver(ContentObserver observer) Register an observer that is called when changes happen to the content backing this cursor.
void	registerDataSetObserver(DataSetObserver observer) Register an observer that is called when changes happen to the contents of the this cursors data set, for example, when the data set is changed via `requery()`, `deactivate()`, or `close()`.
boolean	requery() Performs the query that created the cursor again, refreshing its contents.
Bundle	respond(Bundle extras) This is an out-of-band way for the the user of a cursor to communicate with the cursor.
void	setExtras(Bundle extras) Sets a `Bundle` that will be returned by `getExtras()`.
void	setNotificationUri(ContentResolver cr, Uri notifyUri) Specifies a content URI to watch for changes.
void	unregisterContentObserver(ContentObserver observer) Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.
void	unregisterDataSetObserver(DataSetObserver observer) Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

From interface android.database.CrossProcessCursor

From interface android.database.Cursor

abstract void	close() Closes the Cursor, releasing all of its resources and making it completely invalid.
abstract void	copyStringToBuffer(int columnIndex, CharArrayBuffer buffer) Retrieves the requested column text and stores it in the buffer provided.
abstract void	deactivate() This method was deprecated in API level 16. Since `requery()` is deprecated, so too is this.
abstract byte[]	getBlob(int columnIndex) Returns the value of the requested column as a byte array.
abstract int	getColumnCount() Return total number of columns
abstract int	getColumnIndex(String columnName) Returns the zero-based index for the given column name, or -1 if the column doesn't exist.
abstract int	getColumnIndexOrThrow(String columnName) Returns the zero-based index for the given column name, or throws `IllegalArgumentException` if the column doesn't exist.
abstract String	getColumnName(int columnIndex) Returns the column name at the given zero-based column index.
abstract String[]	getColumnNames() Returns a string array holding the names of all of the columns in the result set in the order in which they were listed in the result.
abstract int	getCount() Returns the numbers of rows in the cursor.
abstract double	getDouble(int columnIndex) Returns the value of the requested column as a double.
abstract Bundle	getExtras() Returns a bundle of extra values.
abstract float	getFloat(int columnIndex) Returns the value of the requested column as a float.
abstract int	getInt(int columnIndex) Returns the value of the requested column as an int.
abstract long	getLong(int columnIndex) Returns the value of the requested column as a long.
abstract Uri	getNotificationUri() Return the URI at which notifications of changes in this Cursor's data will be delivered, as previously set by `setNotificationUri(ContentResolver, Uri)`.
abstract int	getPosition() Returns the current position of the cursor in the row set.
abstract short	getShort(int columnIndex) Returns the value of the requested column as a short.
abstract String	getString(int columnIndex) Returns the value of the requested column as a String.
abstract int	getType(int columnIndex) Returns data type of the given column's value.
abstract boolean	getWantsAllOnMoveCalls() onMove() will only be called across processes if this method returns true.
abstract boolean	isAfterLast() Returns whether the cursor is pointing to the position after the last row.
abstract boolean	isBeforeFirst() Returns whether the cursor is pointing to the position before the first row.
abstract boolean	isClosed() return true if the cursor is closed
abstract boolean	isFirst() Returns whether the cursor is pointing to the first row.
abstract boolean	isLast() Returns whether the cursor is pointing to the last row.
abstract boolean	isNull(int columnIndex) Returns `true` if the value in the indicated column is null.
abstract boolean	move(int offset) Move the cursor by a relative amount, forward or backward, from the current position.
abstract boolean	moveToFirst() Move the cursor to the first row.
abstract boolean	moveToLast() Move the cursor to the last row.
abstract boolean	moveToNext() Move the cursor to the next row.
abstract boolean	moveToPosition(int position) Move the cursor to an absolute position.
abstract boolean	moveToPrevious() Move the cursor to the previous row.
abstract void	registerContentObserver(ContentObserver observer) Register an observer that is called when changes happen to the content backing this cursor.
abstract void	registerDataSetObserver(DataSetObserver observer) Register an observer that is called when changes happen to the contents of the this cursors data set, for example, when the data set is changed via `requery()`, `deactivate()`, or `close()`.
abstract boolean	requery() This method was deprecated in API level 11. Don't use this. Just request a new cursor, so you can do this asynchronously and update your list view once the new cursor comes back.
abstract Bundle	respond(Bundle extras) This is an out-of-band way for the the user of a cursor to communicate with the cursor.
abstract void	setExtras(Bundle extras) Sets a `Bundle` that will be returned by `getExtras()`.
abstract void	setNotificationUri(ContentResolver cr, Uri uri) Register to watch a content URI for changes.
abstract void	unregisterContentObserver(ContentObserver observer) Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.
abstract void	unregisterDataSetObserver(DataSetObserver observer) Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.

From interface java.io.Closeable

From interface java.lang.AutoCloseable

Public Constructors

public SQLiteCursor (SQLiteDatabase db, SQLiteCursorDriver driver, String editTable, SQLiteQuery query)

Added in API level 1

This constructor was deprecated in API level 11.
use SQLiteCursor(SQLiteCursorDriver, String, SQLiteQuery) instead

Execute a query and provide access to its result set through a Cursor interface. For a query such as: SELECT name, birth, phone FROM myTable WHERE ... LIMIT 1,20 ORDER BY... the column names (name, birth, phone) would be in the projection argument and everything from FROM onward would be in the params argument.

Parameters

db	a reference to a Database object that is already constructed and opened. This param is not used any longer
editTable	the name of the table used for this query
query	the rest of the query terms cursor is finalized

public SQLiteCursor (SQLiteCursorDriver driver, String editTable, SQLiteQuery query)

Added in API level 11

Parameters

editTable	the name of the table used for this query
query	the `SQLiteQuery` object associated with this cursor object.

Public Methods

public void close ()

Added in API level 1

Closes the Cursor, releasing all of its resources and making it completely invalid. Unlike deactivate() a call to requery() will not make the Cursor valid again.

public void deactivate ()

Added in API level 1

Deactivates the Cursor, making all calls on it fail until requery() is called. Inactive Cursors use fewer resources than active Cursors. Calling requery() will make the cursor active again.

public int getColumnIndex (String columnName)

Added in API level 1

Returns the zero-based index for the given column name, or -1 if the column doesn't exist. If you expect the column to exist use getColumnIndexOrThrow(String) instead, which will make the error more clear.

Parameters

columnName	the name of the target column.

Returns

the zero-based column index for the given column name, or -1 if the column name does not exist.

public String[] getColumnNames ()

Added in API level 1

Returns a string array holding the names of all of the columns in the result set in the order in which they were listed in the result.

Returns

the names of the columns returned in this query.

public int getCount ()

Added in API level 1

Returns the numbers of rows in the cursor.

Returns

the number of rows in the cursor.

public SQLiteDatabase getDatabase ()

Added in API level 1

Get the database that this cursor is associated with.

Returns

the SQLiteDatabase that this cursor is associated with.

public boolean onMove (int oldPosition, int newPosition)

Added in API level 1

This function is called every time the cursor is successfully scrolled to a new position, giving the subclass a chance to update any state it may have. If it returns false the move function will also do so and the cursor will scroll to the beforeFirst position.

Parameters

oldPosition	the position that we're moving from
newPosition	the position that we're moving to

Returns

true if the move is successful, false otherwise

public boolean requery ()

Added in API level 1

Performs the query that created the cursor again, refreshing its contents. This may be done at any time, including after a call to deactivate(). Since this method could execute a query on the database and potentially take a while, it could cause ANR if it is called on Main (UI) thread. A warning is printed if this method is being executed on Main thread.

Returns

true if the requery succeeded, false if not, in which case the cursor becomes invalid.

public void setSelectionArguments (String[] selectionArgs)

Added in API level 1

Changes the selection arguments. The new values take effect after a call to requery().

public void setWindow (CursorWindow window)

Added in API level 1

Sets a new cursor window for the cursor to use.

The cursor takes ownership of the provided cursor window; the cursor window will be closed when the cursor is closed or when the cursor adopts a new cursor window.

If the cursor previously had a cursor window, then it is closed when the new cursor window is assigned.

Parameters

window	The new cursor window, typically a remote cursor window.

Protected Methods

protected void finalize ()

Added in API level 1

Release the native resources, if they haven't been released yet.

Results

Interfaces

Classes

Exceptions

SQLiteCursor

Class Overview

Summary

Public Constructors

public SQLiteCursor (SQLiteDatabase db, SQLiteCursorDriver driver, String editTable, SQLiteQuery query)

Parameters

public SQLiteCursor (SQLiteCursorDriver driver, String editTable, SQLiteQuery query)

Parameters

Public Methods

public void close ()

public void deactivate ()

public int getColumnIndex (String columnName)

Parameters

Returns

public String[] getColumnNames ()

Returns

public int getCount ()

Returns

public SQLiteDatabase getDatabase ()

Returns

public boolean onMove (int oldPosition, int newPosition)

Parameters

Returns

public boolean requery ()

Returns

public void setSelectionArguments (String[] selectionArgs)

public void setWindow (CursorWindow window)

Parameters

Protected Methods

protected void finalize ()