我正在尝试在Postgresql 9.4中搜索JSONB对象.我的问题类似于
this thread.
但是我的数据结构略有不同,这导致了我的问题.我的数据结构如下:
- [
- {"id":1,"msg":"testing"}
- {"id":2,"msg":"tested"}
- {"id":3,"msg":"nothing"}
- ]
我想通过msg(RegEx,LIKE,=等)搜索该数组中的匹配对象.更具体地说,我希望表中JSONB字段有一个对象的所有行都有一个与我的请求匹配的“msg”.
以下显示了与我的结构类似的结构:
- SELECT * FROM
- (SELECT
- '[{"id":1,"msg":"testing"},{"id":2,"msg":"tested"},{"id":3,"msg":"nothing"}]'::jsonb as data)
- as jsonbexample;
- SELECT * FROM
- (SELECT
- '[{"id":1,"msg":"nothing"}]'::jsonb as data)
- as jsonbexample
- WHERE
- (data #>> '{msg}') LIKE '%est%';
任何人都可以解释如何搜索JSONB数组?在上面的例子中,我想在表中找到其“data”JSONB字段包含“msg”匹配的对象的任何行(例如,LIKE’%est%’).
更新
此代码创建一个新类型(以后需要):
- CREATE TYPE AlertLine AS (id INTEGER,msg TEXT);
然后你可以用它来用JSONB_POPULATE_RECORDSET来拆分列:
- SELECT * FROM
- JSONB_POPULATE_RECORDSET(
- null::AlertLine,(SELECT '[{"id":1,"msg":"nothing"}]'::jsonb
- as data
- )
- ) as jsonbex;
输出:
- id | msg
- ----+---------
- 1 | testing
- 2 | tested
- 3 | nothing
并加入限制:
- SELECT * FROM
- JSONB_POPULATE_RECORDSET(
- null::AlertLine,"msg":"nothing"}]'::jsonb
- as data)
- ) as jsonbex
- WHERE
- msg LIKE '%est%';
输出:
- id | msg
- ---+---------
- 1 | testing
- 2 | tested
所以问题的一部分仍然是如何将其作为另一个查询中的子句.
- SELECT * FROM mytable WHERE x > (0 rows);
你可以使用exists:
- SELECT * FROM
- (SELECT
- '[{"id":1,"msg":"nothing"}]'::jsonb as data)
- as jsonbexample
- WHERE
- EXISTS (SELECT 1 FROM jsonb_array_elements(data) as j(data) WHERE (data#>> '{msg}') LIKE '%est%');
- SELECT * FROM atable
- WHERE EXISTS (SELECT 1 FROM jsonb_array_elements(columnx) as j(data) WHERE (data#>> '{msg}') LIKE '%est%');