cn.tangjiabao.halodb.dbutils.handlers.HaloBeanHandler Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of haloDb Show documentation

Orm whitch The highest development efficiency and Efficiency is the fastest

There is a newer version: 0.17

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 cn.tangjiabao.halodb.dbutils.handlers;

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

import org.apache.commons.dbutils.ResultSetHandler;

import cn.tangjiabao.halodb.dbutils.bean.BeanProcessor;

/**
 * ResultSetHandler implementation that converts the first
 * ResultSet row into a JavaBean. This class is thread safe.
 * 
 * @param 
 *            the target bean type
 * @see org.apache.commons.dbutils.ResultSetHandler
 */
public class HaloBeanHandler implements ResultSetHandler {

	/**
	 * The Class of beans produced by this handler.
	 */
	private final Class type;

	/**
	 * The RowProcessor implementation to use when converting rows into beans.
	 */
	private final Map aliasMap;

	public HaloBeanHandler(Class type, Map aliasMap) {
		this.type = type;
		this.aliasMap = aliasMap;
	}

	/**
	 * Convert the first row of the ResultSet into a bean with the
	 * Class given in the constructor.
	 * 
	 * @param rs
	 *            ResultSet to process.
	 * @return An initialized JavaBean or null if there were no
	 *         rows in the ResultSet.
	 * 
	 * @throws SQLException
	 *             if a database access error occurs
	 * @see org.apache.commons.dbutils.ResultSetHandler#handle(java.sql.ResultSet)
	 */
	@Override
	public T handle(ResultSet rs) throws SQLException {
		return rs.next() ? this.toBean(rs, this.type) : null;
	}

	private T toBean(ResultSet rs, Class type) throws SQLException {
		BeanProcessor beanProcessor = new BeanProcessor();
		T entity = beanProcessor.newInstance(type);
		beanProcessor.instanceBean(entity, this.aliasMap);
		ResultSetMetaData rsmd = rs.getMetaData();
			entity = beanProcessor.createBean(rs, rsmd, entity, this.aliasMap);
		return entity;
	}
}