<?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">
<!-- nanmespace:命名空间。 作用就是对sql进行分类话管理，理解Sal分离注意：使用mapper代理方式，namespace有特殊重要的作用
--><mapper namespace="test"><!-- 删除用户 --><delete id="deleteUser" parameterType="java.lang.Integer">delete from user where id=#{id}</delete></mapper>

package cn.itcast.mybatis.first;import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.List;import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;import cn.itcast.mybatis.po.User;public class Mybatis_first {//会话工厂private SqlSessionFactory sqlSessionFactory;//这些事必备的，所以放在Before这里了
    @Beforepublic void createsqlSessionFactory() throws IOException{//配置文件String resource="SqlMapConfig.xml";InputStream inputStream=Resources.getResourceAsStream(resource);//使用SqlSessionFactoryBuilder从配置文件中创建SqlSessionFactory.sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);}@Test//根据id查询用户的信息public void testFindUseById(){    //数据库会话实例SqlSession sqlSession=null;try {//创建数据库会话实例sqlSession;sqlSession=sqlSessionFactory.openSession();sqlSession.delete("test.deleteUser", 30);//手动提交事务
            sqlSession.commit();//关闭会话
            sqlSession.close();} catch (Exception e) {e.printStackTrace();}finally{//如果sqlSession实例是创建的那么把他关闭掉if(sqlSession!=null){sqlSession.close();}}
}}

<?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">
<!-- nanmespace:命名空间。 作用就是对sql进行分类话管理，理解Sal分离注意：使用mapper代理方式，namespace有特殊重要的作用
--><mapper namespace="test"><!-- 更新用户 --><update id="updetaUser" parameterType="cn.itcast.mybatis.po.User">update user set username=#{username},birthday=#{birthday},sex=#{sex},address=#{address}where id=#{id}</update></mapper>

package cn.itcast.mybatis.first;import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.List;import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;import cn.itcast.mybatis.po.User;public class Mybatis_first {//会话工厂private SqlSessionFactory sqlSessionFactory;//这些事必备的，所以放在Before这里了
    @Beforepublic void createsqlSessionFactory() throws IOException{//配置文件String resource="SqlMapConfig.xml";InputStream inputStream=Resources.getResourceAsStream(resource);//使用SqlSessionFactoryBuilder从配置文件中创建SqlSessionFactory.sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);}@Test//根据id查询用户的信息public void testFindUseById(){    //数据库会话实例SqlSession sqlSession=null;try {//创建数据库会话实例sqlSession;sqlSession=sqlSessionFactory.openSession();User user=new User();user.setAddress("jiali");user.setBirthday(new Date());user.setSex("1");user.setId(29);user.setUsername("王王");sqlSession.update("test.updetaUser", user);//手动提交事务
            sqlSession.commit();//关闭会话
            sqlSession.close();} catch (Exception e) {e.printStackTrace();}finally{//如果sqlSession实例是创建的那么把他关闭掉if(sqlSession!=null){sqlSession.close();}}
}}