Mybatis解决属性名与字段名不一致

标签：mybatis

在开发的时候应该遇到这样的情况，数据库中的字段名与属性名不一致的情况，通常数据库中的字段命名时多个单词之间使用下划线连接在一起的，而在类中的属性名则多数是用驼峰标识的命名方式，我见过的大多数都是这样，那么使用mybatis该如果解决这一的问题呢？如下：

数据表：

CREATE TABLE tab_department(
	ids INT PRIMARY KEY AUTO_INCREMENT,
	de_name VARCHAR(50) COMMENT '部门名称',
	p_ids INT COMMENT '上级部门id',
	de_charge_person VARCHAR(50) COMMENT '部门负责人',
	create_time LONG COMMENT '创建时间'
) COMMENT '部门表'

package com.tenghu.mybatis.model;

import java.io.Serializable;

/**
 * 部门表
 * @author Arvin_Li
 *
 */
public class Department implements Serializable{
	private static final long serialVersionUID = 6998332095922284289L;
	
	private int ids;//部门编号
	private String deName;//部门名称
	private int pIds;//上级部门id
	private String deChargePerson;//部门负责人
	private long createTime;//创建时间
	
	//省略get和set方法
}

mybatis主配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<!-- 配置实体类别名 -->
	<typeAliases>
		<typeAlias type="com.tenghu.mybatis.model.Department" alias="Department"/>
	</typeAliases>
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC"/>
			<dataSource type="POOLED">
				<property name="driver" value="${jdbc.driver}"/>
				<property name="url" value="${jdbc.url}"/>
				<property name="username" value="${jdbc.username}"/>
				<property name="password" value="${jdbc.password}"/>
			</dataSource>
		</environment>
	</environments>
	
	<!-- 配置映射文件 -->
	<mappers>
		<mapper resource="com/tenghu/mybatis/model/xml/DepartmentMapper.xml"/>
	</mappers>
</configuration>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.tenghu.mybatis.model.xml.DepartmentMapper">
	
	<!-- 配置映射字段 -->
	<resultMap type="Department" id="tab_department">
		<id property="ids" column="ids"/>
		<result property="deName" column="de_name"/>
		<result property="pIds" column="p_ids"/>
		<result property="deChargePerson" column="de_charge_person"/>
		<result property="createTime" column="create_time"/>
	</resultMap>
	
	<!-- 查询所有部门 -->
	<select id="queryAllDepartment" resultMap="tab_department">
		select * from tab_department
	</select>
</mapper>

package com.tenghu.mybatis.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

/**
 * Mybatis工具类
 * @author Arvin_Li
 * @version 1.0
 *
 */
public class MybatisUtil {
	private MybatisUtil(){}
	
	//声明SqlSession工厂
	private static SqlSessionFactory sqlSessionFactory;
	
	//使用静态代码块获取SqlSession工厂
	static{
		try {
			//获取mybatis主配置文件流
			InputStream inputStream=Resources.getResourceAsStream("mybatis-config.xml");
			//创建属性文件对象
			Properties properties=new Properties();
			//加载属性配置文件
			properties.load(Resources.getResourceAsStream("jdbc.properties"));
			//创建SqlSessionFactory对象
			sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream, properties);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 开启SqlSession对象，不自动提交
	 * @return
	 */
	public static SqlSession openSession(){
		return sqlSessionFactory.openSession();
	}
	
	/**
	 * 开启自动提交的SqlSession
	 * @return
	 */
	public static SqlSession openAutoCommitSession(){
		return sqlSessionFactory.openSession(true);
	}
	
	/**
	 * 关闭SqlSession
	 * @param sqlSession
	 */
	public static void closeSession(SqlSession sqlSession){
		if(null!=sqlSession){
			sqlSession.close();
		}
		sqlSession=null;
	}
}

package com.tenghu.mybatis.test;

import java.util.List;

import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import com.tenghu.mybatis.model.Department;
import com.tenghu.mybatis.util.MybatisUtil;

/**
 * 部门测试类
 * @author Arvin_Li
 *
 */
public class DepartmentTest {
	//命名空间
	private String namespace="com.tenghu.mybatis.model.xml.DepartmentMapper.";
	
	/**
	 * 查询出所有部门
	 */
	@Test
	public void testQueryAllDepartment(){
		//获取SqlSession
		SqlSession sqlSession=MybatisUtil.openSession();
		try {
			//查询
			List<Department> departList=sqlSession.selectList(namespace+"queryAllDepartment");
			//输出部门信息
			for (Department department : departList) {
				System.out.println(department.getIds()+"\t"+department.getDeName()+"\t"+department.getpIds()+"\t"+department.getDeChargePerson());
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			//关闭SqlSession
			MybatisUtil.closeSession(sqlSession);
		}
	}
}

Mybatis解决属性名与字段名不一致

标签：mybatis

原文地址：http://blog.csdn.net/u011109042/article/details/42456055