表数据(member)
id | info |
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1 | {“id”:1,“name”:“swk”} | 2 | {“id”:2,“name”:“zbj”} | 3 | {“id”:3,“name”:“ss”} | 4 | {“id”:4,“name”:“ts”} |
例一,在field中使用 ->在field中使用的时候结果带引号,->>的结果不带引号 select info->"$.name" from member; select info->>"$.name" from member;
例二,在where条件中使用 特别注意:->当做where查询是要注意类型的,->>是不用注意类型的 select * from member where info->"$.id" = 1; select * from member where info->"$.id" = "1"; select * from member where info->>"$.id" = 1; select * from member where info->>"$.id" = "1";
例三,在order中使用 没有发现有什么区别 select * from member order by info->"$.id" desc; select * from member order by info->>"$.id" desc;
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