<!-- 批量新增-->
<insert id="batchSave" parameterType="java.util.List">
    INSERT INTO lp_user_test_batch
    (
    id,
    user_id,
    user_name,
    user_age,
    type,
    create_time,
    update_time
    )
    VALUES
    <foreach collection="list" item="item" index="index" separator=",">
        (
        #{item.id,jdbcType=BIGINT},
        #{item.userId,jdbcType=VARCHAR},
        #{item.userName,jdbcType=VARCHAR},
        #{item.userAge,jdbcType=INTEGER},
        #{item.type,jdbcType=INTEGER},
        #{item.createTime,jdbcType=TIMESTAMP},
        #{item.updateTime,jdbcType=TIMESTAMP}
        )
    </foreach>
</insert>

<!-- 批量新增或更新-->
<insert id="batchSaveOrUpdate" parameterType="java.util.List">
    INSERT INTO lp_user_test_batch
    (
    id,
    user_id,
    user_name,
    user_age,
    type,
    create_time,
    update_time
    )
    VALUES
    <foreach collection="list" item="item" index="index" separator=",">
        (
        #{item.id,jdbcType=BIGINT},
        #{item.userId,jdbcType=VARCHAR},
        #{item.userName,jdbcType=VARCHAR},
        #{item.userAge,jdbcType=INTEGER},
        #{item.type,jdbcType=INTEGER},
        #{item.createTime,jdbcType=TIMESTAMP},
        #{item.updateTime,jdbcType=TIMESTAMP}
        )
    </foreach>
    ON DUPLICATE KEY UPDATE
    user_name = VALUES(user_name),
    user_age = VALUES(user_age),
    type = VALUES(type),
    update_time = VALUES(update_time)
</insert>

<insert id="insert" >
    INSERT INTO lp_user_test_batch
    (
    id,
    user_id,
    user_name,
    user_age,
    type,
    create_time,
    update_time
    )
    values
    (
    #{id,jdbcType=BIGINT},
    #{userId,jdbcType=VARCHAR},
    #{userName,jdbcType=VARCHAR},
    #{userAge,jdbcType=INTEGER},
    #{type,jdbcType=INTEGER},
    #{createTime,jdbcType=TIMESTAMP},
    #{updateTime,jdbcType=TIMESTAMP}
    )
</insert>

@Resource(name = "sqlSessionFactory")
private SqlSessionFactory sqlSessionFactory;

/**
 * 利用 MyBatis 批處理特性，批量提交
 */
public void batchInsert(List<UserTestBatchDO> testBatchDAOList) {
    //集合非空
    if (CollectionUtils.isEmpty(testBatchDAOList)) {
        return;
    }
    //批處理方式 SqlSession
    SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH);
    //獲得對(duì)應(yīng)的Mapper
    UserTestBatchDOMapper userTestBatchDOMapper = sqlSession.getMapper(UserTestBatchDOMapper.class);
    try {
        for (UserTestBatchDO testBatchDO : testBatchDAOList) {
            userTestBatchDOMapper.insert(testBatchDO);
        }
        //統(tǒng)一提交
        sqlSession.commit();
    } catch (Exception e) {
        //沒(méi)有提交的數(shù)據(jù)可以回滾
        sqlSession.rollback();
    } finally {
        //關(guān)閉 sqlSession
        sqlSession.close();
    }
}

<!-- 批量新增或更新-->
<insert id="batchSaveOrUpdate" parameterType="java.util.List">
    INSERT INTO lp_user_test_batch
    (
    id,
    user_id,
    user_name,
    user_age,
    type,
    create_time,
    update_time
    )
    VALUES
    <foreach collection="list" item="item" index="index" separator=",">
        (
        #{item.id,jdbcType=BIGINT},
        #{item.userId,jdbcType=VARCHAR},
        #{item.userName,jdbcType=VARCHAR},
        #{item.userAge,jdbcType=INTEGER},
        #{item.type,jdbcType=INTEGER},
        #{item.createTime,jdbcType=TIMESTAMP},
        #{item.updateTime,jdbcType=TIMESTAMP}
        )
    </foreach>
    ON DUPLICATE KEY UPDATE
    user_name = VALUES(user_name),
    user_age = VALUES(user_age),
    type = VALUES(type),
    update_time = VALUES(update_time)
</insert>

<update id="updateByUserId" >
    UPDATE  lp_user_test_batch
    SET
    user_name = #{userName,jdbcType=VARCHAR},
    user_age = #{userAge,jdbcType=INTEGER},
    type = #{type,jdbcType=INTEGER},
    update_time = #{updateTime,jdbcType=TIMESTAMP}
    WHERE user_id = #{userId,jdbcType=VARCHAR}
</update>

@Resource(name = "sqlSessionFactory")
private SqlSessionFactory sqlSessionFactory;

/**
 * 利用 MyBatis 批處理特性，批量更新
 */
public void batchUpdate(List<UserTestBatchDO> testBatchDAOList) {
    //集合非空
    if (CollectionUtils.isEmpty(testBatchDAOList)) {
        return;
    }
    //批處理方式 SqlSession
    SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH);
    //獲得對(duì)應(yīng)的Mapper
    UserTestBatchDOMapper userTestBatchDOMapper = sqlSession.getMapper(UserTestBatchDOMapper.class);
    try {
        for (UserTestBatchDO testBatchDO : testBatchDAOList) {
            userTestBatchDOMapper.updateByUserId(testBatchDO);
        }
        //統(tǒng)一提交
        sqlSession.commit();
        //清理緩存，防止溢出
        sqlSession.clearCache();
    } catch (Exception e) {
        //沒(méi)有提交的數(shù)據(jù)可以回滾
        sqlSession.rollback();
    } finally {
        //關(guān)閉 sqlSession
        sqlSession.close();
    }
}

for (UserTestBatchDO userTestBatch : testBatchDAOList) {
    userTestBatchDOMapper.updateByUserId(userTestBatch);
}

<!-- 接收l(shuí)ist參數(shù)，循環(huán)著組裝sql語(yǔ)句，注意for循環(huán)的寫法
             separator=";" 代表著每次循環(huán)完，在sql后面放一個(gè)分號(hào) -->
<update id="updateForeachByUserId" parameterType="java.util.List">
    <foreach collection="list" item="item" separator=";">
        UPDATE lp_user_test_batch
        SET
        user_name = #{item.userName,jdbcType=VARCHAR},
        user_age = #{item.userAge,jdbcType=INTEGER},
        type = #{item.type,jdbcType=INTEGER},
        update_time = #{item.updateTime,jdbcType=TIMESTAMP}
        WHERE user_id = #{item.userId,jdbcType=VARCHAR}
    </foreach>
</update>

<!-- 批量更新第二種方法，通過(guò) case when語(yǔ)句變相的進(jìn)行批量更新 -->
    <update id="updateCaseByUserId" parameterType="java.util.List">
        update lp_user_test_batch
        <trim prefix="set" suffixOverrides=",">

            <!-- 拼接case when 這是另一種寫法 -->
            <trim prefix="user_name =case" suffix="end,">
                <foreach collection="list" item="item">
                    <if test="item.userName!=null">
                        when user_id = #{item.userId,jdbcType=VARCHAR} then #{item.userName,jdbcType=VARCHAR}
                    </if>
                </foreach>
            </trim>

            <trim prefix="user_age =case" suffix="end,">
                <foreach collection="list" item="item">
                    <if test="item.userAge!=null">
                        when user_id = #{item.userId,jdbcType=VARCHAR} then #{item.userAge,jdbcType=INTEGER}
                    </if>
                </foreach>
            </trim>

            <trim prefix="type =case" suffix="end,">
                <foreach collection="list" item="item">
                    <if test="item.type!=null">
                        when user_id = #{item.userId,jdbcType=VARCHAR} then #{item.type,jdbcType=INTEGER}
                    </if>
                </foreach>
            </trim>

            <trim prefix="update_time =case" suffix="end,">
                <foreach collection="list" item="item">
                    <if test="item.type!=null">
                        when user_id = #{item.userId,jdbcType=VARCHAR} then #{item.updateTime,jdbcType=TIMESTAMP}
                    </if>
                </foreach>
            </trim>
        </trim>
         <where>
            user_id in
            <foreach collection="list" index="index" item="item" separator="," open="(" close=")">
                #{item.userId,jdbcType=VARCHAR}
            </foreach>
        </where>
    </update>