java mybatis

mybatis简单使用记录一下

mybatis官网：http://www.mybatis.org/mybatis-3/

参考博客：https://blog.csdn.net/iku5200/article/details/82856621

配置

application.properties

mybatis.mapper-locations:classpath:/mapping/*.xml
mybatis.config-location:classpath:/mybatis-config.xml

model表（略）

dao层：

import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface TestConfigMapper {
    List<TestConfigEntity> findAll();
    int upsertBatch(List<TestConfigEntity> list);
}

mapping/mapping.xml

<?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.sensor.xxx.dao.TestConfigMapper">  <!-- 指向dao层 -->

    <select id="findAll" resultType="com.sensor.xxx.models.TestConfigEntity">  <!-- 返回一个列表，列表中的元素type是 entity对象 -->
            select * from vibration_config  <!-- sql语句 -->
    </select>

    <insert id="upsertBatch" parameterType="java.util.List">  <!-- 批量操作foreach循环 -->
        insert into vibration_config (point_id, duration)
        values
        <foreach collection="list" item="item" index="index" separator=",">  <!-- jdbcType 指定映射类型 -->
            (#{item.pointId,jdbcType=VARCHAR},#{item.duration,jdbcType=INTEGER})  <!-- 如果不写括号，可以用参数指定：open="(" separator="," close=")"-->
        </foreach> 
        ON conflict(point_id) do update set 
        duration = excluded.duration 
    </insert> 
</mapper>

第二个是批量 没有添加，有就更新（postgres）

====

批量删除

   <delete id="deleteBatch" parameterType="java.util.List">
        delete from vibration_alarm_realtime where point_id in
        <foreach collection="list" item="point_id" open="(" separator="," close=")">
            #{point_id}
        </foreach>
    </delete>

    <delete id="deleteAll">
        delete from vibration_alarm_realtime
    </delete>