T - The type of the scalarpublic 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.org.apache.commons.dbutils.ResultSetHandler| 构造器和说明 |
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ScalarHandler()
Creates a new instance of ScalarHandler.
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ScalarHandler(int columnIndex)
Creates a new instance of ScalarHandler.
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ScalarHandler(String columnName)
Creates a new instance of ScalarHandler.
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public ScalarHandler()
handle().public ScalarHandler(int columnIndex)
columnIndex - The index of the column to retrieve from the
ResultSet.public ScalarHandler(String columnName)
columnName - The name of the column to retrieve from the
ResultSet.public T extractData(ResultSet rs) throws SQLException
ResultSet column as an object via the
ResultSet.getObject() method that performs type
conversions.extractData 在接口中 org.springframework.jdbc.core.ResultSetExtractor<T>rs - ResultSet to process.null if there are no rows in
the ResultSet.SQLException - if a database access error occursClassCastException - if the class datatype does not match the column typeorg.apache.commons.dbutils.ResultSetHandler#handle(java.sql.ResultSet)Copyright © 2016. All rights reserved.