mybatis解决批量更新阻塞

这是mybatis批量更新的两种写法，第二种采用的是mysql的语法

UPDATE test set username=#{item.username},
password=#{item.password},
u_t=#{item.u_t},
c_t=#{item.c_t}
where id=#{item.id}

update test

                    when id=#{i.id} then #{i.username}

            </foreach>
        </trim>
        <trim prefix=" password =case" suffix="end,">
            <foreach collection="list" item="i" index="index">

                    when id=#{i.id} then #{i.password}

            </foreach>
        </trim>

        <trim prefix="c_t =case" suffix="end," >
            <foreach collection="list" item="i" index="index">

                    when id=#{i.id} then #{i.c_t}

            </foreach>
        </trim>
        <trim prefix="u_t =case" suffix="end," >
            <foreach collection="list" item="i" index="index">

                    when id=#{i.id} then #{i.u_t}

            </foreach>
        </trim>
    </trim>
    where
    <foreach collection="list" separator="or" item="i" index="index" >
        id=#{i.id}
    </foreach>
</update>

再来看看，这两种写法的执行sql
[com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@a8e6492]
18:01:06.213 [main] DEBUG com.meicai.dao.mapper.TestEntityMapper.update - ==> Preparing: UPDATE test set username=?, password=?, u_t=?, c_t=? where id=? ; UPDATE test set username=?, password=?, u_t=?, c_t=? where id=? ; UPDATE test set username=?, password=?, u_t=?, c_t=? where id=? ; UPDATE test set username=?, password=?, u_t=?, c_t=? where id=? ; UPDATE test set username=?, password=?, u_t=?, c_t=? where id=? ; UPDATE test set username=?, password=?, u_t=?, c_t=? where id=? ; UPDATE test set username=?, password=?, u_t=?, c_t=? where id=? ; UPDATE test set username=?, password=?, u_t=?, c_t=? where id=? ; UPDATE test set username=?, password=?, u_t=?, c_t=? where id=?
18:01:06.261 [main] DEBUG com.meicai.dao.mapper.TestEntityMapper.update - ==> Parameters: 张三(String), 1234561(String), 12:17(String), 12:17(String), 1(Integer), 张三(String), 1234562(String), 12:17(String), 12:17(String), 2(Integer), 张三(String), 1234563(String), 12:17(String), 12:17(String), 3(Integer), 张三(String), 1234564(String), 12:17(String), 12:17(String), 4(Integer), 张三(String), 1234565(String), 12:17(String), 12:17(String), 5(Integer), 张三(String), 1234566(String), 12:17(String), 12:17(String), 6(Integer), 张三(String), 1234567(String), 12:17(String), 12:17(String), 7(Integer), 张三(String), 1234568(String), 12:17(String), 12:17(String), 8(Integer), 张三(String), 1234569(String), 12:17(String), 12:17(String), 9(Integer)
18:01:06.281 [main] DEBUG com.alibaba.druid.pool.PreparedStatementPool - {conn-10005, pstmt-20000} enter cache

[com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@a8e6492]
17:56:54.548 [main] DEBUG com.meicai.dao.mapper.TestEntityMapper.batchUpdate1 - ==> Preparing: update test set username =case when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? end, password =case when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? end, c_t =case when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? end, u_t =case when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? when id=? then ? end where id=? or id=? or id=? or id=? or id=? or id=? or id=? or id=? or id=? or id=?
17:56:54.621 [main] DEBUG com.meicai.dao.mapper.TestEntityMapper.batchUpdate1 - ==> Parameters: 0(Integer), 张三(String), 1(Integer), 张三(String), 2(Integer), 张三(String), 3(Integer), 张三(String), 4(Integer), 张三(String), 5(Integer), 张三(String), 6(Integer), 张三(String), 7(Integer), 张三(String), 8(Integer), 张三(String), 9(Integer), 张三(String), 0(Integer), 1234560(String), 1(Integer), 1234561(String), 2(Integer), 1234562(String), 3(Integer), 1234563(String), 4(Integer), 1234564(String), 5(Integer), 1234565(String), 6(Integer), 1234566(String), 7(Integer), 1234567(String), 8(Integer), 1234568(String), 9(Integer), 1234569(String), 0(Integer), 12:16(String), 1(Integer), 12:16(String), 2(Integer), 12:16(String), 3(Integer), 12:16(String), 4(Integer), 12:16(String), 5(Integer), 12:16(String), 6(Integer), 12:16(String), 7(Integer), 12:16(String), 8(Integer), 12:16(String), 9(Integer), 12:16(String), 0(Integer), 12:16(String), 1(Integer), 12:16(String), 2(Integer), 12:16(String), 3(Integer), 12:16(String), 4(Integer), 12:16(String), 5(Integer), 12:16(String), 6(Integer), 12:16(String), 7(Integer), 12:16(String), 8(Integer), 12:16(String), 9(Integer), 12:16(String), 0(Integer), 1(Integer), 2(Integer), 3(Integer), 4(Integer), 5(Integer), 6(Integer), 7(Integer), 8(Integer), 9(Integer)
17:56:54.636 [main] DEBUG com.alibaba.druid.pool.PreparedStatementPool - {conn-10005, pstmt-20000} enter cache

mybatis解决批量更新阻塞

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