Spring Framework example source code file (MappingSqlQuery.java)

This example Spring Framework source code file (MappingSqlQuery.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

jdbc, map, map, mappingsqlquery, mappingsqlquery, mappingsqlquerywithparameters, object, object, sql, sqlexception, sqlexception, string, util

The Spring Framework MappingSqlQuery.java source code

/*
 * Copyright 2002-2005 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.object;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Map;

import javax.sql.DataSource;

/**
 * Reusable query in which concrete subclasses must implement the abstract
 * mapRow(ResultSet, int) method to convert each row of the JDBC ResultSet
 * into an object.
 *
 * <p>Simplifies MappingSqlQueryWithParameters API by dropping parameters and
 * context. Most subclasses won't care about parameters. If you don't use
 * contextual information, subclass this instead of MappingSqlQueryWithParameters.
 *
 * @author Rod Johnson
 * @author Thomas Risberg
 * @author Jean-Pierre Pawlak
 * @see MappingSqlQueryWithParameters
 */
public abstract class MappingSqlQuery extends MappingSqlQueryWithParameters {

	/**
	 * Constructor that allows use as a JavaBean.
	 */
	public MappingSqlQuery() {
	}

	/**
	 * Convenient constructor with DataSource and SQL string.
	 * @param ds DataSource to use to obtain connections
	 * @param sql SQL to run
	 */
	public MappingSqlQuery(DataSource ds, String sql) {
		super(ds, sql);
	}

	/**
	 * This method is implemented to invoke the simpler mapRow
	 * template method, ignoring parameters.
	 * @see #mapRow(ResultSet, int)
	 */
	protected final Object mapRow(ResultSet rs, int rowNum, Object[] parameters, Map context)
			throws SQLException {

		return mapRow(rs, rowNum);
	}

	/**
	 * Subclasses must implement this method to convert each row of the
	 * ResultSet into an object of the result type.
	 * <p>Subclasses of this class, as opposed to direct subclasses of
	 * MappingSqlQueryWithParameters, don't need to concern themselves
	 * with the parameters to the execute method of the query object.
	 * @param rs ResultSet we're working through
	 * @param rowNum row number (from 0) we're up to
	 * @return an object of the result type
	 * @throws SQLException if there's an error extracting data.
	 * Subclasses can simply not catch SQLExceptions, relying on the
	 * framework to clean up.
	 */
	protected abstract Object mapRow(ResultSet rs, int rowNum) throws SQLException;

}