作者
digoal
日期
2020-03-24
标签
PostgreSQL , mongodb
背景
https://github.com/postgrespro/monq
MonQ
postgreSQL extension for MongoDB query support
Introduction
MonQ – is a postgreSQL extension which allow use mongoDB query language to query jsonb data type, introduced in PostgreSQL release 9.4.
The main task of this extension is to provide apportunity to make queries on mongodb query language, translate their in to jsquery query language and return result of them.
MonQ is released as mquery data type and <=> match operator for jsonb.
```
Usage
MonQ extension contains:
mquery - datatype which represents MongoDB query in tree structure;
<=> - maching operator which take like arguments jsonb document and mongoDB query. This operator have 2 variants of representation: jsonb <=> mquery and mquery <=> jsonb.
Example of query:
select '{ "a" : [ "ssl","security", "pattern"] }'::jsonb <=>
'{ a: { $all: [ "ssl","security"] } }'::mquery;
This mongoDB query:
{ a: { $all: [ "ssl","security"] } }
transformed to this JsQuery query:
a @> [ "ssl","security"]
and passed like arguments to JsQuery execution functions with jsonb document. Execution function return true or falsedependently of result.
?column?
t
(1 row)
You cah use key a without quotes, but if it complicated key "a.b.c.qwerty.d" you need to use them.
```
PostgreSQL 许愿链接
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PostgreSQL 解决方案集合
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