06-Mybatis-执行批量插入

MySQL 执行SQL:

INSERT DELAYED INTO SYS_JOB_WORK (JNL_NO, WORK_DT ) 
VALUES
    (1, 'aas'),
    (2, 'ffff');

Mybatis对应sql：

 <insert id="insertList" parameterType="java.util.List" useGeneratedKeys="false">
        INSERT INTO SYS_JOB_WORK( 
                JNL_NO, 
                WORK_DT
            ) VALUES
        <foreach collection="jobWorks" item="jobWork" index="index" separator=",">
            (
            #{jobWork.jnlNo, jdbcType=VARCHAR}, 
            #{jobWork.workDate, jdbcType=VARCHAR}
            )
        </foreach>
         SELECT 1 FROM DUAL
    </insert>

Oracle执行SQL:

 INSERT ALL
      INTO SYS_JOB_WORK( JNL_NO, WORK_DT ) VALUES ('1','2019-04-21')
      INTO SYS_JOB_WORK( JNL_NO, WORK_DT ) VALUES ('2','2019-04-21')
      INTO SYS_JOB_WORK( JNL_NO, WORK_DT ) VALUES ('3','2019-04-21')
 SELECT 1 FROM DUAL;

Mybatis对应sql：

方案1 ： 下面这种方式在数据大于500条后效率很低，用这种方式最好数据不要大于500条

    <insert id="insertList" parameterType="java.util.List" useGeneratedKeys="false">
        INSERT ALL
        <foreach collection="jobWorks" item="jobWork" index="index">
            INTO SYS_JOB_WORK( 
                JNL_NO, 
                WORK_DT
            ) VALUES (
            #{jobWork.jnlNo, jdbcType=VARCHAR}, 
            #{jobWork.workDate, jdbcType=VARCHAR}
            )
        </foreach>
         SELECT 1 FROM DUAL
    </insert>

方案 2 利用标签，将入参的list集合通过UNION ALL生成虚拟数据，从而实现批量插

<insert id="insertList" parameterType="java.util.List">
 INSERT INTO SYS_JOB_WORK( JNL_NO, WORK_DT)
 select A.* from ( 
     <foreach collection="jobWorks" item="jobWork" index="index" separator="UNION ALL">
      select 
         #{jobWork.jnlNo, jdbcType=VARCHAR}, 
         #{jobWork.workDate, jdbcType=VARCHAR}
      from dual
 </foreach>) A
</insert>

方案3： 利用存储过程实现批量插入

<insert id="insertList" parameterType="java.util.List">
 begin
 <foreach collection="jobWorks" item="jobWork" index="index">
    INSERT INTO SYS_JOB_WORK( JNL_NO, WORK_DT) 
    values ( 
        #{jobWork.jnlNo, jdbcType=VARCHAR}, 
        #{jobWork.workDate, jdbcType=VARCHAR}
    );
  </foreach>
  end;
</insert>