Mybatis实现批量更新数据(批量update)

<update id="updateBatchById">
    <foreach collection="list" item="item" separator=";">
        update
            `t_student`
        set
            `name` = #{item.name},
            `age` = #{item.age}
        where
            id = #{item.id}
    </foreach>
</update>

spring.datasource.url=jdbc:mysql://localhost:3306/test?allowMultiQueries=true

update `t_student`
<trim prefix="set" suffixOverrides=",">
    <trim prefix=" `name` = case " suffix=" end, ">
        <foreach collection="list" item="item">
            <if test="item.name != null">
                when `id` = #{item.id} then #{item.name}
            </if>
        </foreach>
    </trim>
    <trim prefix=" `age` = case " suffix=" end, ">
        <foreach collection="list" item="item">
            <if test="item.age != null">
                when `id` = #{item.id} then #{item.age}
            </if>
        </foreach>
    </trim>
</trim>
where
    `id` in
<foreach collection="list" item="item" open="(" close=")" separator=",">
    #{item.id}
</foreach>

UPDATE `t_student` 
SET `name` =
CASE
		WHEN `id` = 1 THEN
		'张三' 
		WHEN `id` = 2 THEN
		'李四' 
		WHEN `id` = 3 THEN
		'王五' 
		WHEN `id` = 4 THEN
		'赵六' 
	END,
	`age` =
CASE
		WHEN `id` = 1 THEN
		40 
		WHEN `id` = 2 THEN
		34 
		WHEN `id` = 3 THEN
		55 
		WHEN `id` = 4 THEN
		76 
	END 
WHERE
	`id` IN ( 1, 2, 3, 4 )