com.vonchange.headb.springjdbc.handlers

类 ScalarHandler<T>

java.lang.Object

com.vonchange.headb.springjdbc.handlers.ScalarHandler<T>

类型参数:

T - The type of the scalar

所有已实现的接口:

org.springframework.jdbc.core.ResultSetExtractor<T>

public class ScalarHandler<T>
extends Object
implements org.springframework.jdbc.core.ResultSetExtractor<T>

ResultSetHandler implementation that converts one ResultSet column into an Object. This class is thread safe.

另请参阅:

org.apache.commons.dbutils.ResultSetHandler

构造器概要

构造器

构造器和说明
ScalarHandler() Creates a new instance of ScalarHandler.
ScalarHandler(int columnIndex) Creates a new instance of ScalarHandler.
ScalarHandler(String columnName) Creates a new instance of ScalarHandler.

方法概要

方法

限定符和类型	方法和说明
T	extractData(ResultSet rs) Returns one ResultSet column as an object via the ResultSet.getObject() method that performs type conversions.

从类继承的方法 java.lang.Object

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

构造器详细资料

ScalarHandler

public ScalarHandler()

Creates a new instance of ScalarHandler. The first column will be returned from handle().

ScalarHandler

public ScalarHandler(int columnIndex)

Creates a new instance of ScalarHandler.

参数:

columnIndex - The index of the column to retrieve from the ResultSet.

ScalarHandler

public ScalarHandler(String columnName)

Creates a new instance of ScalarHandler.

参数:

columnName - The name of the column to retrieve from the ResultSet.

方法详细资料

extractData

public T extractData(ResultSet rs)
              throws SQLException

Returns one ResultSet column as an object via the ResultSet.getObject() method that performs type conversions.

指定者:

extractData 在接口中 org.springframework.jdbc.core.ResultSetExtractor<T>

参数:

rs - ResultSet to process.

返回:

The column or null if there are no rows in the ResultSet.

抛出:

SQLException - if a database access error occurs

ClassCastException - if the class datatype does not match the column type

另请参阅:

org.apache.commons.dbutils.ResultSetHandler#handle(java.sql.ResultSet)