程序包 ohos.data.resultset

类 AbsSharedResultSet

java.lang.Object

ohos.data.resultset.AbsResultSet

ohos.data.resultset.AbsSharedResultSet

所有已实现的接口:

ResultSet, SharedResultSet

public abstract class AbsSharedResultSet
extends AbsResultSet
implements SharedResultSet

Represents an abstract class that implements the SharedResultSet class.

This class implements some basic functions of SharedResultSet.

从以下版本开始:

3

SystemCapability

SystemCapability.Data#DATA_APPDATAMGR

嵌套类概要

从接口继承的嵌套类/接口 ohos.data.resultset.ResultSet

ResultSet.ColumnType

字段概要

字段

限定符和类型	字段	说明
protected SharedBlock	sharedBlock	The SharedBlock owned by this AbsSharedResultSet.

从类继承的字段 ohos.data.resultset.AbsResultSet

DEFAULT_POS, isClosed, pos

构造器概要

构造器

构造器	说明
AbsSharedResultSet(String name)	AbsSharedResultSet construction method.

方法概要

限定符和类型	方法	说明
protected void	checkState(int columnIndex)	Check current status.
protected void	clearBlock()	Clears data in a shared block that is not empty in this AbsSharedResultSet object.
void	close()	Closes the result set.
protected void	closeBlock()	Closes a shared block that is not empty in this AbsSharedResultSet object.
void	fillBlock(int startRowIndex, SharedBlock block)	Adds the data of a SharedResultSet to a SharedBlock.
protected void	finalize()	Release the native shared block resources.
byte[]	getBlob(int columnIndex)	Obtains the value of the specified column in the current row as a byte array.
SharedBlock	getBlock()	Get current shared block.
ResultSet.ColumnType	getColumnTypeForIndex(int columnIndex)	Obtains the data type based on the specified column index.
double	getDouble(int columnIndex)	Obtains the value of the specified column in the current row as a double.
float	getFloat(int columnIndex)	Obtains the value of the specified column in the current row as a float.
int	getInt(int columnIndex)	Obtains the value of the specified column in the current row as an int.
long	getLong(int columnIndex)	Obtains the value of the specified column in the current row as a long.
short	getShort(int columnIndex)	Obtains the value of the specified column in the current row as a short.
String	getString(int columnIndex)	Obtains the value of the specified column in the current row as a string.
boolean	goToRow(int rowIndex)	Go to the specified row of the result set.
boolean	hasBlock()	Checks whether an AbsSharedResultSet object contains shared blocks.
boolean	isColumnNull(int columnIndex)	Checks whether the value of the specified column in the current row is null.
boolean	onGo(int oldRowIndex, int newRowIndex)	Called when the position of the result set changes.
void	setBlock(SharedBlock block)	Allocates a new shared block to an AbsSharedResultSet.

从类继承的方法 ohos.data.resultset.AbsResultSet

getAffectedByUris, getAllColumnNames, getColumnCount, getColumnIndexForName, getColumnNameForIndex, getExtensions, getRowCount, getRowIndex, goTo, goToFirstRow, goToLastRow, goToNextRow, goToPreviousRow, isAtFirstRow, isAtLastRow, isClosed, isEnded, isStarted, notifyChange, registerObserver, setAffectedByUris, setExtensions, unregisterObserver

从类继承的方法 java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 ohos.data.resultset.ResultSet

getAffectedByUris, getAllColumnNames, getColumnCount, getColumnIndexForName, getColumnNameForIndex, getExtensions, getRowCount, getRowIndex, goTo, goToFirstRow, goToLastRow, goToNextRow, goToPreviousRow, isAtFirstRow, isAtLastRow, isClosed, isEnded, isStarted, registerObserver, setAffectedByUris, setExtensions, unregisterObserver

字段详细资料

sharedBlock

protected SharedBlock sharedBlock

The SharedBlock owned by this AbsSharedResultSet.

构造器详细资料

AbsSharedResultSet

public AbsSharedResultSet(String name)

AbsSharedResultSet construction method.

参数:

name - Name of shared block.

从以下版本开始:

3

方法详细资料

getBlob

public byte[] getBlob(int columnIndex)

从接口复制的说明: ResultSet

Obtains the value of the specified column in the current row as a byte array.

The implementation class determines whether to throw an exception if the value of the specified column in the current row is null or the specified column is not of the Blob type.

指定者:

getBlob 在接口中 ResultSet

指定者:

getBlob 在类中 AbsResultSet

参数:

columnIndex - Indicates the specified column index, which starts from 0.

返回:

Returns the value of the specified column as a byte array.

getString

public String getString(int columnIndex)

从接口复制的说明: ResultSet

Obtains the value of the specified column in the current row as a string.

The implementation class determines whether to throw an exception if the value of the specified column in the current row is null or the specified column is not of the string type.

指定者:

getString 在接口中 ResultSet

指定者:

getString 在类中 AbsResultSet

参数:

columnIndex - Indicates the specified column index, which starts from 0.

返回:

Returns the value of the specified column as a string.

getShort

public short getShort(int columnIndex)

从接口复制的说明: ResultSet

Obtains the value of the specified column in the current row as a short.

he implementation class determines whether to throw an exception if the value of the specified column in the current row is null, the specified column is not of the integer type, or the integer is beyond the range [Short.MIN_VALUE, Short.MAX_VALUE].

指定者:

getShort 在接口中 ResultSet

指定者:

getShort 在类中 AbsResultSet

参数:

columnIndex - Indicates the specified column index, which starts from 0.

返回:

Returns the value of the specified column as a short.

getInt

public int getInt(int columnIndex)

从接口复制的说明: ResultSet

Obtains the value of the specified column in the current row as an int.

The implementation class determines whether to throw an exception if the value of the specified column in the current row is null, the specified column is not of the integer type, or the integer is beyond the range [Integer.MIN_VALUE, Integer.MAX_VALUE].

指定者:

getInt 在接口中 ResultSet

指定者:

getInt 在类中 AbsResultSet

参数:

columnIndex - Indicates the specified column index, which starts from 0.

返回:

Returns the value of the specified column as an int.

getLong

public long getLong(int columnIndex)

从接口复制的说明: ResultSet

Obtains the value of the specified column in the current row as a long.

The implementation class determines whether to throw an exception if the value of the specified column in the current row is null, the specified column is not of the integer type, or the integer is beyond the range [Long.MIN_VALUE, Long.MAX_VALUE].

指定者:

getLong 在接口中 ResultSet

指定者:

getLong 在类中 AbsResultSet

参数:

columnIndex - Indicates the specified column index, which starts from 0.

返回:

Returns the value of the specified column as a long.

getFloat

public float getFloat(int columnIndex)

从接口复制的说明: ResultSet

Obtains the value of the specified column in the current row as a float.

The implementation class determines whether to throw an exception if the value of the specified column in the current row is null, the specified column is not of the floating-point type, or the floating-point value cannot be represented by a float.

指定者:

getFloat 在接口中 ResultSet

指定者:

getFloat 在类中 AbsResultSet

参数:

columnIndex - Indicates the specified column index, which starts from 0.

返回:

Returns the value of the specified column as a float.

getDouble

public double getDouble(int columnIndex)

从接口复制的说明: ResultSet

Obtains the value of the specified column in the current row as a double.

The implementation class determines whether to throw an exception if the value of the specified column in the current row is null, the specified column is not of the floating-point type, or the floating-point value cannot be represented by a double.

指定者:

getDouble 在接口中 ResultSet

指定者:

getDouble 在类中 AbsResultSet

参数:

columnIndex - Indicates the specified column index, which starts from 0.

返回:

Returns the value of the specified column as a double.

isColumnNull

public boolean isColumnNull(int columnIndex)

从接口复制的说明: ResultSet

Checks whether the value of the specified column in the current row is null.

指定者:

isColumnNull 在接口中 ResultSet

指定者:

isColumnNull 在类中 AbsResultSet

参数:

columnIndex - Indicates the specified column index, which starts from 0.

返回:

Returns true if the value of the specified column in the current row is null; returns false otherwise.

getColumnTypeForIndex

public ResultSet.ColumnType getColumnTypeForIndex(int columnIndex)

从接口复制的说明: ResultSet

Obtains the data type based on the specified column index.

The return value is of the enumeration type, which can be an integer, float, String, Blob, or null.

指定者:

getColumnTypeForIndex 在接口中 ResultSet

参数:

columnIndex - Indicates the specified column index.

返回:

Returns the data type of the specified column.

checkState

protected void checkState(int columnIndex)

Check current status.

参数:

columnIndex - The index of the column to check.

onGo

public boolean onGo(int oldRowIndex,
                    int newRowIndex)

从接口复制的说明: SharedResultSet

Called when the position of the result set changes.

When the result set is moved to a new position, this method is called to notify the child class of the move result. If false is returned, the result set will be moved to the beforeFirst position.

指定者:

onGo 在接口中 SharedResultSet

参数:

oldRowIndex - Indicates the original position of the result set.

newRowIndex - Indicates the new position of the result set.

返回:

Returns true if the result set is moved successfully; returns false otherwise.

fillBlock

public void fillBlock(int startRowIndex,
                      SharedBlock block)

从接口复制的说明: SharedResultSet

Adds the data of a SharedResultSet to a SharedBlock.

This method is used to add the data of a SharedResultSet (starting from the startRowIndex position) to a SharedBlock until all data of the SharedResultSet is added to the SharedBlock or the SharedBlock space is insufficient.

指定者:

fillBlock 在接口中 SharedResultSet

参数:

startRowIndex - Indicates the index in the SharedResultSet. The index starts from 0, indicating the first row.

block - Indicates the block whose data is to be added to the SharedResultSet.

getBlock

public SharedBlock getBlock()

Get current shared block.

指定者:

getBlock 在接口中 SharedResultSet

返回:

return current shared block, it may be empty.

从以下版本开始:

3

setBlock

public void setBlock(SharedBlock block)

Allocates a new shared block to an AbsSharedResultSet.

The allocated shared block will replace the existing shared block in the AbsSharedResultSet, and the replaced shared block will be released.

参数:

block - Indicates the shared block to allocate.

从以下版本开始:

3

hasBlock

public boolean hasBlock()

Checks whether an AbsSharedResultSet object contains shared blocks.

返回:

Returns true if the AbsSharedResultSet contains shared blocks; returns false otherwise.

从以下版本开始:

3

closeBlock

protected void closeBlock()

Closes a shared block that is not empty in this AbsSharedResultSet object.

从以下版本开始:

3

clearBlock

protected void clearBlock()

Clears data in a shared block that is not empty in this AbsSharedResultSet object.

从以下版本开始:

3

goToRow

public final boolean goToRow(int rowIndex)

从接口复制的说明: ResultSet

Go to the specified row of the result set.

指定者:

goToRow 在接口中 ResultSet

指定者:

goToRow 在类中 AbsResultSet

参数:

rowIndex - Indicates the index of the specified row, which starts from 0.

返回:

Returns true if the result set is moved successfully; returns false otherwise.

close

public void close()

从接口复制的说明: ResultSet

Closes the result set.

Calling this method on the result set will release all of its resources and makes it ineffective.

指定者:

close 在接口中 ResultSet

覆盖:

close 在类中 AbsResultSet

另请参阅:

ResultSet.isClosed()

finalize

protected void finalize()

Release the native shared block resources.

覆盖:

finalize 在类中 AbsResultSet

另请参阅:

WeakReference, PhantomReference