基于Mybatis实现CRUD操作过程解析(xml方式)

2023-07-12 22:41:03 325

1、环境搭建

1.1表结构

createtableuser(
idintprimarykeyauto_increment,
usernamevarchar(20)notnull,
birthdaydate,
sexchar(1)default'男',
addressvarchar(50)
);

insertintouservalues(null,'孙悟空','1980-10-24','男','花果山水帘洞');
insertintouservalues(null,'白骨精','1992-11-12','女','白虎岭白骨洞');
insertintouservalues(null,'猪八戒','1983-05-20','男','福临山云栈洞');
insertintouservalues(null,'蜘蛛精','1995-03-22','女','盤丝洞');

1.2创建项目

导入如下jar

mybatis框架包
数据库驱动包
log4j日志包
junit单元测试包

1.3准备配置文件

在src下准备配置文件：sqlMapConfig.xml

在src下准备配置文件：log4j.properties

#Globalloggingconfiguration
log4j.rootLogger=DEBUG,stdout

#Consoleoutput...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p[%t]-%m%n

2-增删改查源码

1.1执行结果

1.2User类代码

importjava.sql.Date;

/**
用户实体类对象*/
publicclassUser{

privateIntegerid;
privateStringusername;
privateDatebirthday;
privateStringsex;
privateStringaddress;

publicUser(){
}

publicUser(Integerid,Stringusername,Datebirthday,Stringsex,Stringaddress){
this.id=id;
this.username=username;
this.birthday=birthday;
this.sex=sex;
this.address=address;
}

publicIntegergetId(){
returnid;
}

publicvoidsetId(Integerid){
this.id=id;
}

publicStringgetUsername(){
returnusername;
}

publicvoidsetUsername(Stringusername){
this.username=username;
}

publicDategetBirthday(){
returnbirthday;
}

publicvoidsetBirthday(Datebirthday){
this.birthday=birthday;
}

publicStringgetSex(){
returnsex;
}

publicvoidsetSex(Stringsex){
this.sex=sex;
}

publicStringgetAddress(){
returnaddress;
}

publicvoidsetAddress(Stringaddress){
this.address=address;
}

@Override
publicStringtoString(){
return"User{"+
"id="+id+
",username='"+username+'\''+
",birthday="+birthday+
",sex='"+sex+'\''+
",address='"+address+'\''+
'}';
}
}

1.3UserMapper接口代码

packagecom.vg.dao;

importcom.vg.entity.User;
importorg.apache.ibatis.annotations.Param;

importjava.util.List;
/**
*数据访问层接口：对用户进行增删改查操作
*/
publicinterfaceUserMapper{
	/**
	*添加用户
	*/
	intaddUser(Useruser);
	/**
	*根据id删除用户
	*/
	voiddeleteUser(Integerid);
	/**
	*通过id修改用户信息
	*/
	/**
	*修改用户信息
	*/
	voidupdateUser(Useruser);
	/**
	*查询所有用户
	*/
	ListfindAllUsers();
	/**
	*根据id查询用户
	*/
	UserfindUserById(intid);

	/**
	*根据用户名模糊查询用户
	*/
	ListfindUsersByName(Stringusername);
	/**
	*根据姓名和性别查询用户数据(姓名使用模糊查询)
	*/

	/**
	*根据用户名称模糊查询用户
	*/
}
}

1.4UserMapper.xml接口映射文件









select*fromuser



select*fromuserwhereid=#{id};



select*fromuserwhereusernamelike#{username}



insertintouservalues(null,#{username},#{birthday},#{sex},#{address});



updateusersetusername=#{username},
birthday=#{birthday},sex=#{sex},address=#{address}
whereid=#{id}



deletefromuserwhereid=#{id}

1.5在主配置文件中加载接口映射文件

1.6测试类代码

packagecom.vg.test;

importcom.vg.dao.UserMapper;
importcom.vg.entity.User;
importorg.apache.ibatis.io.Resources;
importorg.apache.ibatis.session.SqlSession;
importorg.apache.ibatis.session.SqlSessionFactory;
importorg.apache.ibatis.session.SqlSessionFactoryBuilder;
importorg.junit.After;
importorg.junit.Before;
importorg.junit.BeforeClass;
importorg.junit.Test;

importjava.io.IOException;
importjava.io.InputStream;
importjava.sql.Date;
importjava.util.List;

/**
*测试类
*/
publicclassTestUserMapper{
	privatestaticSqlSessionFactorysqlSessionFactory=null;
	privateSqlSessionsqlSession=null;
	privateUserMapperuserMapper=null;

	//该方法在所有测试方法执行之前执行1次
	@BeforeClass
	publicstaticvoidinit()throwsException{
		//1.通过Resources类，加载sqlMapConfig.xml，得到文件输入流对
		InputStreamin=Resources.getResourceAsStream("sqlMapConfig.xml");
		//2.实例化会话工厂创建类SqlSessionFactoryBuilder对象
		SqlSessionFactoryBuilderbuilder=newSqlSessionFactoryBuilder();
		//3.根据字节输入流获取SqlSessionFactory对象
		sqlSessionFactory=builder.build(in);
	}
	//该方法会在每个测试方法执行之前执行1次
	@Before
	publicvoidbefore(){
		//4.获取SqlSession对象，等价连接对象
		//true:事务自动提交，false:不自动提交,默认值
		sqlSession=sqlSessionFactory.openSession();
		//5.创建接口实现类对象
		userMapper=sqlSession.getMapper(UserMapper.class);

	}
	/**
	*测试方法：通过用户名模糊查询用户
	*/
	@Test
	publicvoidtestAddUser()throwsException{
		//1.获得接口代理对象
		UserMapperuserMapper=sqlSession.getMapper(UserMapper.class);
		//2.创建User对象
		Useru=newUser();
		u.setUsername("如来佛祖111");
		u.setBirthday(Date.valueOf("1980-01-20"));
		u.setAddress("西天灵山");
		u.setSex("男");
		//3.保存用户信息
		introw=userMapper.addUser(u);
		System.out.println("row="+row);
		//4.手动提交事务
		sqlSession.commit();
	}
	/**
	*测试方法：通过用户名模糊查询用户
	*/
	@Test
	publicvoidtestFindUserByName()throwsException{
		ListuserList=userMapper.findUsersByName("%精%");
		for(Useruser:userList){
			System.out.println(user);
		}
	}

	/**
	*测试方法：查询所有用户
	*/
	@Test
	publicvoidtestFindAllUsers()throwsException{
		ListuserList=userMapper.findAllUsers();
		for(Useruser:userList){
			System.out.println(user);
		}
	}

	/**
	*根据id查询用户
	*@throwsException
	*/
	@Test
	publicvoidtestFindUserById()throwsException{
		//6.调用接口的方法根据id查询用户
		Useruser=userMapper.findUserById(1);
		System.out.println("user="+user);

	}
	@Test
	publicvoidtestUpdateUser()throwsException{
		//创建用户对象
		Useruser=newUser(
				6,
				"牛魔王",
				Date.valueOf("1998-02-20"),
				"妖",
				"牛魔洞");
		//更新用户
		userMapper.updateUser(user);

		//提交事务
		sqlSession.commit();
	}
	@Test
	publicvoidtestDeleteUser()throwsException{
		//1.获得接口代理对象
		UserMapperuserMapper=sqlSession.getMapper(UserMapper.class);
		//2.根据id删除用户
		userMapper.deleteUser(6);
		//3.提交事务
		sqlSession.commit();
	}
	@After
	publicvoidafter(){
		//7.关闭会话，释放资源。

		sqlSession.close();
	}
}

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基于Mybatis实现CRUD操作过程解析(xml方式)

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