Postgresql和Mysql插入式更新区别
单条语句
//mysql 单条语句
<insert id="save"
parameterType="com.demo.User">
insert into t_user
(id,level)
values
(
#{id},
#{level}
)
ON DUPLICATE KEY UPDATE
id =VALUES(id),
level = VALUES(level)
</insert>
// postgresql 单条操作
<insert id="insertAndUpdate">
insert into t_user (id, level)
values (1, 0)
ON CONFLICT (id) DO UPDATE
set level = t_user.level + 1;// 如id存在则level加1
</insert>
批量操作
// mysql 批量操作
<insert id="batchUpdate" parameterType="java.util.List">
insert into t_user
(id, level)
values
<foreach collection="list" item="item" index="index"
separator=",">
(
#{item.id,jdbcType=INTEGER},
#{item.level,jdbcType=INTEGER}
)
</foreach>
ON DUPLICATE KEY UPDATE
id =VALUES(id),
level = VALUES(level)
</insert>
// postgresql 批量操作
<insert id="batchUpdate">
insert into t_user (id, level)
values (1, 3), (2, 1)
on CONFLICT (id) DO UPDATE
set level = excluded.level;// excluded用来引用前面的值
</insert>