mybatis

<?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>
    <!-- 和spring整合后environments配置将废除 -->
    <environments default="development">
        <environment id="development">
            <!-- shiyong使用jdbc事务管理 -->
            <transactionManager type="JDBC"></transactionManager>
            <!-- 数据库连接池 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    
    <!-- 查找sql映射文件 -->
    <mappers>
    <mapper resource="mapper/CustomerMapper.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">
<!-- 该文件主要是编写mybaties中的mapper接口里面的方法提供对应的sql语句 -->
<!--这里的namespace指的是dao层接口的全名称-->
<mapper namespace="dao.SaveUsersss">

    <!-- 添加客户 -->
    <!--id指的是dao层接口的方法名，parameterType：传入的参数名称-->
    <insert id="saveUsers" parameterType="java.util.List">
        insert into ssm.t_customer(name,gender,telephone,address) values
　　　　<!--collection=""具体里面写入什么值，根据传递过来的参数而定，若是数组，则用array-->
　　　　<!--具体的请参考：https://www.cnblogs.com/yy3b2007com/p/10417242.html#autoid-3-0-0，里面介绍的挺详细-->
　　　　　　<!--collection="list"表示这个传过来额参数为List集合，item：每一次遍历获得的结果对象，separator=","：每一次遍历的结果用","隔开-->
        <foreach collection="list" item="HAHA" index="index" separator=",">
        (
        #{HAHA.name},
        #{HAHA.gender},
        #{HAHA.telephone},
        #{HAHA.address}
        )
        </foreach>
    </insert>

　　<!-- 查询 -->

　　<!--resultType：返回的结果集-->
　　<select id="saveMessage" resultType="entity.UserEntity"
　　　　parameterType="java.util.List">
　　　　select * from ssm.t_customer where id in

　　　　　　<!--open：遍历过程中以什么开始，close：遍历过程中以什么结束-->
　　　　　　<foreach item="item" index="index" collection="list" open="("
　　　　　　　　separator="," close=")">
　　　　　　　　#{item}
　　　　　　</foreach>
　　</select>

</mapper>

package mytest;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
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.Test;

import dao.UserMapper;
import entity.UserEntity;

public class MyTest {
//    private SqlSessionFactoryBuilder sqlSessionFactoryBuilder;

    @Test
    public void getMessage() throws IOException{
        //1创建sqlsessionfactorybuild
        SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
        //2读取mybatis配置文件
        InputStream inputStream = Resources.getResourceAsStream("myMapConfig.xml");
        //3创建sqlsessionfactory
        SqlSessionFactory build = sqlSessionFactoryBuilder.build(inputStream);
        //4打开session
        SqlSession openSession = build.openSession();
        
        //5获取Mapper接口对象,接收CustomerMapper生成的代理类对象
        UserMapper mapper = openSession.getMapper(UserMapper.class);
        List<Integer> list = new ArrayList<Integer>();
        list.add(1);
        list.add(2);
        list.add(3);
        List<UserEntity> saveMessage = mapper.saveMessage(list);

        System.out.println(saveMessage);
        //提交事务
        openSession.commit();
        //关闭连接
        openSession.close();
    }
}