ResultSetWrapper

java.lang.Object
- ohos.data.resultset.ResultSetWrapper

所有已实现的接口:

ResultSet
```
public class ResultSetWrapper
extends Object
implements ResultSet
```
A wrapper class of a result set. This class delegates all method calls in ResultSet to its implementation class.
This class is mainly used to extend ResultSet by overriding some of its methods.

从以下版本开始:

1

另请参阅:

ResultSet

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 ResultSet mResultSet
Indicates the result set wrapped by the wrapper class.

字段
限定符和类型	字段	说明
`protected ResultSet`	`mResultSet`	Indicates the result set wrapped by the wrapper class.

构造器概要

构造器
构造器说明

ResultSetWrapper(ResultSet inputResultSet)
A parameterized constructor used to create a ResultSetWrapper instance.

构造器
构造器	说明
`ResultSetWrapper(ResultSet inputResultSet)`	A parameterized constructor used to create a `ResultSetWrapper` instance.

方法概要

所有方法实例方法具体方法
限定符和类型	方法	说明
`void`	`close()`	Closes the result set.
`List<Uri>`	`getAffectedByUris()`	Obtains the list of URIs registered to observe changes that affect the result set.
`String[]`	`getAllColumnNames()`	Obtains the names of all columns in a result set.
`byte[]`	`getBlob(int columnIndex)`	Obtains the value of the specified column in the current row as a byte array.
`int`	`getColumnCount()`	Obtains the number of columns in the result set.
`int`	`getColumnIndexForName(String columnName)`	Obtains the column index based on the specified column name.
`String`	`getColumnNameForIndex(int columnIndex)`	Obtains the column name based on the specified column index.
`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.
`PacMap`	`getExtensions()`	Obtains extensions of the result set.
`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.
`ResultSet`	`getResultSet()`	Obtains the result set from `ResultSetWrapper`.
`int`	`getRowCount()`	Obtains the number of rows in the result set.
`int`	`getRowIndex()`	Obtains the current index of the result set.
`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`	`goTo(int offset)`	Go to the specified row of the result set forwards or backwards by an offset relative to its current position.
`boolean`	`goToFirstRow()`	Go to the first row of the result set.
`boolean`	`goToLastRow()`	Go to the last row of the result set.
`boolean`	`goToNextRow()`	Go to the next row of the result set.
`boolean`	`goToPreviousRow()`	Go to the previous row of the result set.
`boolean`	`goToRow(int rowIndex)`	Go to the specified row of the result set.
`boolean`	`isAtFirstRow()`	Checks whether the result set is positioned at the first row.
`boolean`	`isAtLastRow()`	Checks whether the result set is positioned at the last row.
`boolean`	`isClosed()`	Checks whether the current result set is closed.
`boolean`	`isColumnNull(int columnIndex)`	Checks whether the value of the specified column in the current row is null.
`boolean`	`isEnded()`	Checks whether the result set is positioned after the last row.
`boolean`	`isStarted()`	Checks whether a result set has been moved.
`void`	`registerObserver(DataObserver observer)`	Registers an observer that listens for data changes.
`void`	`setAffectedByUris(Object context, List<Uri> uris)`	Sets the URIs of the data to be observed.
`void`	`setExtensions(PacMap extensions)`	Sets extensions of the result set.
`void`	`unregisterObserver(DataObserver observer)`	Deregisters an observer that listens for data changes.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - mResultSet
```
protected ResultSet mResultSet
```
    Indicates the result set wrapped by the wrapper class.
    After the result set is wrapped, if any of its methods are not overridden in the wrapper class, these methods in the ResultSet object will be called.
    
    从以下版本开始:
    
    1
- 构造器详细资料
  - ResultSetWrapper
```
public ResultSetWrapper(ResultSet inputResultSet)
```
    A parameterized constructor used to create a ResultSetWrapper instance.
    The input result set will be wrapped in the ResultSetWrapper.
    
    参数:
    
    inputResultSet - Indicates the input result set.
    
    从以下版本开始:
    
    1
- 方法详细资料
  - getResultSet
```
public ResultSet getResultSet()
```
    Obtains the result set from ResultSetWrapper.
    The result set you will obtain is the one you input for wrapping.
    
    返回:
    
    Returns the result set wrapped in ResultSetWrapper.
  - getAllColumnNames
```
public String[] getAllColumnNames()
```
    从接口复制的说明: ResultSet
    
    Obtains the names of all columns in a result set.
    The column names are returned as a string array, in which the strings are in the same order as the columns in the result set.
    
    指定者:
    
    getAllColumnNames 在接口中 ResultSet
    
    返回:
    
    Returns a string array containing all the column names in the result set.
  - getColumnCount
```
public int getColumnCount()
```
    从接口复制的说明: ResultSet
    
    Obtains the number of columns in the result set.
    The returned number is equal to the length of the string array returned by the getAllColumnNames method.
    
    指定者:
    
    getColumnCount 在接口中 ResultSet
    
    返回:
    
    Returns the number of columns in the result set.
    
    另请参阅:
    
    ResultSet.getAllColumnNames()
  - 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.
  - getColumnIndexForName
```
public int getColumnIndexForName(String columnName)
```
    从接口复制的说明: ResultSet
    
    Obtains the column index based on the specified column name.
    The column name is passed as an input parameter.
    
    指定者:
    
    getColumnIndexForName 在接口中 ResultSet
    
    参数:
    
    columnName - Indicates the name of the specified column in the result set.
    
    返回:
    
    Returns the index of the specified column.
  - getColumnNameForIndex
```
public String getColumnNameForIndex(int columnIndex)
```
    从接口复制的说明: ResultSet
    
    Obtains the column name based on the specified column index.
    The column index is passed as an input parameter.
    
    指定者:
    
    getColumnNameForIndex 在接口中 ResultSet
    
    参数:
    
    columnIndex - Indicates the index of the specified column in the result set.
    
    返回:
    
    Returns the name of the specified column.
  - getRowCount
```
public int getRowCount()
```
    从接口复制的说明: ResultSet
    
    Obtains the number of rows in the result set.
    
    指定者:
    
    getRowCount 在接口中 ResultSet
    
    返回:
    
    Returns the number of rows in the result set.
  - getRowIndex
```
public int getRowIndex()
```
    从接口复制的说明: ResultSet
    
    Obtains the current index of the result set.
    The result set index starts from 0.
    
    指定者:
    
    getRowIndex 在接口中 ResultSet
    
    返回:
    
    Returns the current index of the result set.
  - goTo
```
public boolean goTo(int offset)
```
    从接口复制的说明: ResultSet
    
    Go to the specified row of the result set forwards or backwards by an offset relative to its current position. A positive offset indicates moving backwards, and a negative offset indicates moving forwards.
    
    指定者:
    
    goTo 在接口中 ResultSet
    
    参数:
    
    offset - Indicates the offset relative to the current position.
    
    返回:
    
    Returns true if the result set is moved successfully and does not go beyond the range; returns false otherwise.
  - goToRow
```
public 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
    
    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.
  - goToFirstRow
```
public boolean goToFirstRow()
```
    从接口复制的说明: ResultSet
    
    Go to the first row of the result set.
    
    指定者:
    
    goToFirstRow 在接口中 ResultSet
    
    返回:
    
    Returns true if the result set is moved successfully; returns false otherwise, for example, if the result set is empty.
  - goToLastRow
```
public boolean goToLastRow()
```
    从接口复制的说明: ResultSet
    
    Go to the last row of the result set.
    
    指定者:
    
    goToLastRow 在接口中 ResultSet
    
    返回:
    
    Returns true if the result set is moved successfully; returns false otherwise, for example, if the result set is empty.
  - goToNextRow
```
public boolean goToNextRow()
```
    从接口复制的说明: ResultSet
    
    Go to the next row of the result set.
    
    指定者:
    
    goToNextRow 在接口中 ResultSet
    
    返回:
    
    Returns true if the result set is moved successfully; returns false otherwise, for example, if the result set is already in the last row.
  - goToPreviousRow
```
public boolean goToPreviousRow()
```
    从接口复制的说明: ResultSet
    
    Go to the previous row of the result set.
    
    指定者:
    
    goToPreviousRow 在接口中 ResultSet
    
    返回:
    
    Returns true if the result set is moved successfully; returns false otherwise, for example, if the result set is already in the first row.
  - isEnded
```
public boolean isEnded()
```
    从接口复制的说明: ResultSet
    
    Checks whether the result set is positioned after the last row.
    
    指定者:
    
    isEnded 在接口中 ResultSet
    
    返回:
    
    Returns true if the result set is positioned after the last row; returns false otherwise.
  - isStarted
```
public boolean isStarted()
```
    从接口复制的说明: ResultSet
    
    Checks whether a result set has been moved.
    
    指定者:
    
    isStarted 在接口中 ResultSet
    
    返回:
    
    Returns true if the result set has been moved; returns false if the result set has not been moved or the result set is empty.
  - isAtFirstRow
```
public boolean isAtFirstRow()
```
    从接口复制的说明: ResultSet
    
    Checks whether the result set is positioned at the first row.
    
    指定者:
    
    isAtFirstRow 在接口中 ResultSet
    
    返回:
    
    Returns true if the result set is positioned at the first row; returns false otherwise.
  - isAtLastRow
```
public boolean isAtLastRow()
```
    从接口复制的说明: ResultSet
    
    Checks whether the result set is positioned at the last row.
    
    指定者:
    
    isAtLastRow 在接口中 ResultSet
    
    返回:
    
    Returns true if the result set is positioned at the last row; returns false otherwise.
  - 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
    
    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
    
    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
    
    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
    
    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
    
    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
    
    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
    
    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
    
    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.
  - isClosed
```
public boolean isClosed()
```
    从接口复制的说明: ResultSet
    
    Checks whether the current result set is closed.
    If the result set is closed by calling the close method, true will be returned.
    
    指定者:
    
    isClosed 在接口中 ResultSet
    
    返回:
    
    Returns true if the result set is closed; returns false otherwise.
    
    另请参阅:
    
    ResultSet.close()
  - 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
    
    另请参阅:
    
    ResultSet.isClosed()
  - setExtensions
```
public void setExtensions(PacMap extensions)
```
    从接口复制的说明: ResultSet
    
    Sets extensions of the result set.
    You can set extensions based on your service requirements.
    
    指定者:
    
    setExtensions 在接口中 ResultSet
    
    参数:
    
    extensions - Indicates the extensions to set.
    
    另请参阅:
    
    ResultSet.getExtensions()
  - getExtensions
```
public PacMap getExtensions()
```
    从接口复制的说明: ResultSet
    
    Obtains extensions of the result set.
    The extensions you will obtain are those set based on your service requirements.
    
    指定者:
    
    getExtensions 在接口中 ResultSet
    
    返回:
    
    Returns the extensions of the result set.
    
    另请参阅:
    
    ResultSet.setExtensions(ohos.utils.PacMap)
  - setAffectedByUris
```
public void setAffectedByUris(Object context,
                              List<Uri> uris)
```
    从接口复制的说明: ResultSet
    
    Sets the URIs of the data to be observed.
    After setting the URIs, call the ResultSet#registerObserver method to register an observer that listens for data changes.
    
    指定者:
    
    setAffectedByUris 在接口中 ResultSet
    
    参数:
    
    context - Indicates the context.
    
    uris - Uri list to observe changes which affect this ResultSet.
    
    另请参阅:
    
    ResultSet.registerObserver(ohos.data.rdb.DataObserver)
  - getAffectedByUris
```
public List<Uri> getAffectedByUris()
```
    从接口复制的说明: ResultSet
    
    Obtains the list of URIs registered to observe changes that affect the result set.
    The list of URIs is set using the ResultSet#setAffectedByUris method.
    
    指定者:
    
    getAffectedByUris 在接口中 ResultSet
    
    返回:
    
    Returns the list of URIs.
  - registerObserver
```
public void registerObserver(DataObserver observer)
```
    从接口复制的说明: ResultSet
    
    Registers an observer that listens for data changes.
    When a notification of the change of data with a specified URI is received, this observer will be triggered.
    
    指定者:
    
    registerObserver 在接口中 ResultSet
    
    参数:
    
    observer - Indicates the observer to be registered.
    
    另请参阅:
    
    ResultSet.setAffectedByUris(java.lang.Object, java.util.List<ohos.utils.net.Uri>), ResultSet.unregisterObserver(ohos.data.rdb.DataObserver)
  - unregisterObserver
```
public void unregisterObserver(DataObserver observer)
```
    从接口复制的说明: ResultSet
    
    Deregisters an observer that listens for data changes.
    This method is used to release the observer before the component to which the observer belongs is destroyed.
    
    指定者:
    
    unregisterObserver 在接口中 ResultSet
    
    参数:
    
    observer - Indicates the observer to be deregistered.

类 ResultSetWrapper

嵌套类概要

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

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

mResultSet

构造器详细资料

ResultSetWrapper

方法详细资料

getResultSet

getAllColumnNames

getColumnCount

getColumnTypeForIndex

getColumnIndexForName

getColumnNameForIndex

getRowCount

getRowIndex

goTo

goToRow

goToFirstRow

goToLastRow

goToNextRow

goToPreviousRow

isEnded

isStarted

isAtFirstRow

isAtLastRow

getBlob

getString

getShort

getInt

getLong

getFloat

getDouble

isColumnNull

isClosed

close

setExtensions

getExtensions

setAffectedByUris

getAffectedByUris

registerObserver

unregisterObserver