mysql 查询json类型数据
先查询mysql的版本，如果mysql版本在5.7及以上版本可以使用json格式
select version()
如果 t1表里有一个extra字段，字段是text类型，数据为json格式 {"value":"XMjgxIqqqqqqqqqq"}
通过jSON_EXTRACT可以获取json里面value对于的值
JSON_EXTRACT(t1.extra,'$.value')
得到 "XMjgxIqqqqqqqqqq"
如果想去除两侧引号，需要先做类型转换再做trim
trim(both '"' from cast(JSON_EXTRACT(t1.extra,'$.value') as char))
得到 XMjgxIqqqqqqqqqq
原始sql和原始结果
select t1.id AS item_id, t1.title AS item_name,t6.id AS topic_id, t6.title AS topic_name, t1.extra AS media_id, t1.biz_type from tem t1 join component_item t2 on t1.id = t2.item_id join component t3 on t2.component_id = t3.id join drawer t4 on t4.id = t3.drawer_id join channel_drawer t5 on t5.drawer_id = t4.id join channel t6 on t6.id = t5.channel_id where t1.biz_type in ("JUMP_TO_SHOW","JUMP_TO_VIDEO") and t1.extra IS NOT NULL and t6.topic_property IS NOT NULL
优化后的sql
select t1.id AS item_id, t1.title AS item_name,t6.id AS topic_id, t6.title AS topic_name, trim(both '"' from cast(JSON_EXTRACT(t1.extra,'$.value') as char)) AS media_id, trim(LEADING 'JUMP_TO_' from t1.biz_type) AS biz_type from item_pre t1 join component_item_pre t2 on t1.id = t2.item_id join component_pre t3 on t2.component_id = t3.id join drawer_pre t4 on t4.id = t3.drawer_id join channel_drawer_pre t5 on t5.drawer_id = t4.id join channel_pre t6 on t6.id = t5.channel_id where t1.biz_type in ("JUMP_TO_SHOW","JUMP_TO_VIDEO") and t1.extra IS NOT NULL and t6.topic_property IS NOT NULL and JSON_EXTRACT(t6.topic_property,'$.group')= "电影"
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