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准备表

创建项目并导包

创建User类

package pers.zhang.po;import java.io.Serializable;import java.util.Date;public class User implements Serializable {
   	/**	 * 	 */	private static final long serialVersionUID = 1L;	private Integer id;	private String username;// 用户姓名	private String sex;// 性别	private Date birthday;// 生日	private String address;// 地址	public Integer getId() {
   		return id;	}	public void setId(Integer id) {
   		this.id = id;	}	public String getUsername() {
   		return username;	}	public void setUsername(String username) {
   		this.username = username;	}	public String getSex() {
   		return sex;	}	public void setSex(String sex) {
   		this.sex = sex;	}	public Date getBirthday() {
   		return birthday;	}	public void setBirthday(Date birthday) {
   		this.birthday = birthday;	}	public String getAddress() {
   		return address;	}	public void setAddress(String address) {
   		this.address = address;	}	@Override	public String toString() {
   		return "User [id=" + id + ", username=" + username + ", sex=" + sex				+ ", birthday=" + birthday + ", address=" + address + "]";	}}

书写配置文件

log4j.properties:

# Global logging configurationlog4j.rootLogger=ERROR,stdout# MyBatis logging configuration...log4j.logger.pers.zhang=DEBUG# Console output...log4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

jdbc.properties:

jdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8jdbc.username=rootjdbc.password=123456

sqlMapCongfig.xml:

映射文件UserMapper.xml

   
   
   	
    	
    		select * from user where id = #{v}			
    	
    		select * from user where username like "%"#{haha}"%"			
    	
    		
     
      			select LAST_INSERT_ID()		
     		insert into user (username,birthday,address,sex) 		values (#{username},#{birthday},#{address},#{sex})	
    		
    	
    
     		update user 		set username = #{username},sex = #{sex},birthday = #{birthday},address = #{address}		where id = #{id}	
    		
    	
    
     		delete from user 		where id = #{vvvvv}	
    
   

查询

@Testpublic void testMybatis() throws Exception {
   	//加载核心配置文件	String resource = "sqlMapConfig.xml";	InputStream in = Resources.getResourceAsStream(resource);	//创建SqlSessionFactory	SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);	//创建SqlSession	SqlSession sqlSession = sqlSessionFactory.openSession();		//执行Sql语句 	User user = sqlSession.selectOne("findUserById", 1);		System.out.println(user);}

控制台打印：

User [id=1, username=王五, sex=0, birthday=Fri Oct 25 00:00:00 CST 2019, address=北京]

模糊查询

@Testpublic void testfindUserByUsername() throws Exception {
   	//加载核心配置文件	String resource = "sqlMapConfig.xml";	InputStream in = Resources.getResourceAsStream(resource);	//创建SqlSessionFactory	SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);	//创建SqlSession	SqlSession sqlSession = sqlSessionFactory.openSession();		//执行Sql语句 	List
   
     users = sqlSession.selectList("findUserByUsername", "五");	for (User user2 : users) {
   		System.out.println(user2);			}}
   

控制台打印：

User [id=1, username=王五, sex=0, birthday=Fri Oct 25 00:00:00 CST 2019, address=北京]User [id=5, username=五菱宏光, sex=null, birthday=null, address=null]

insert操作

@Testpublic void testInsertUser() throws Exception {
   	//加载核心配置文件	String resource = "sqlMapConfig.xml";	InputStream in = Resources.getResourceAsStream(resource);	//创建SqlSessionFactory	SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);	//创建SqlSession	SqlSession sqlSession = sqlSessionFactory.openSession();		//执行Sql语句 	User user = new User();	user.setUsername("李雷");	user.setBirthday(new Date());	user.setAddress("北京");	user.setSex("男");	int i = sqlSession.insert("insertUser", user);	sqlSession.commit();		System.out.println(user.getId());	}

update操作

@Testpublic void testUpdateUserById() throws Exception {
   	//加载核心配置文件	String resource = "sqlMapConfig.xml";	InputStream in = Resources.getResourceAsStream(resource);	//创建SqlSessionFactory	SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);	//创建SqlSession	SqlSession sqlSession = sqlSessionFactory.openSession();		//执行Sql语句 	User user = new User();	user.setId(1);	user.setUsername("修改后的王五");	user.setBirthday(new Date());	user.setAddress("北京");	user.setSex("0");	int i = sqlSession.update("test.updateUserById", user);	sqlSession.commit();}

delete操作

@Testpublic void testDelete() throws Exception {
   	//加载核心配置文件	String resource = "sqlMapConfig.xml";	InputStream in = Resources.getResourceAsStream(resource);	//创建SqlSessionFactory	SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);	//创建SqlSession	SqlSession sqlSession = sqlSessionFactory.openSession();		sqlSession.delete("test.deleteUserById", 1);	sqlSession.commit();}

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