mysql> SET @j = '{"a": 1, "b": 2, "c": {"d": 4}}'; mysql> SELECT JSON_CONTAINS_PATH(@j, 'one', '$.a', '$.e'); +---------------------------------------------+ | JSON_CONTAINS_PATH(@j, 'one', '$.a', '$.e') | +---------------------------------------------+ | 1 | +---------------------------------------------+ mysql> SELECT JSON_CONTAINS_PATH(@j, 'all', '$.a', '$.e'); +---------------------------------------------+ | JSON_CONTAINS_PATH(@j, 'all', '$.a', '$.e') | +---------------------------------------------+ | 0 | +---------------------------------------------+ mysql> SELECT JSON_CONTAINS_PATH(@j, 'one', '$.c.d'); +----------------------------------------+ | JSON_CONTAINS_PATH(@j, 'one', '$.c.d') | +----------------------------------------+ | 1 | +----------------------------------------+ mysql> SELECT JSON_CONTAINS_PATH(@j, 'one', '$.a.d'); +----------------------------------------+ | JSON_CONTAINS_PATH(@j, 'one', '$.a.d') | +----------------------------------------+ | 0 | +----------------------------------------+

JSON_EXTRACT(json_doc, path[, path] ...)

从json文档里抽取数据。如果有参数有NULL或path不存在，则返回NULL。如果抽取出多个path，则返回的数据封闭在一个json array里。

mysql> SELECT JSON_EXTRACT('[10, 20, [30, 40]]', '$[1]'); +--------------------------------------------+ | JSON_EXTRACT('[10, 20, [30, 40]]', '$[1]') | +--------------------------------------------+ | 20 | +--------------------------------------------+ mysql> SELECT JSON_EXTRACT('[10, 20, [30, 40]]', '$[1]', '$[0]'); +----------------------------------------------------+ | JSON_EXTRACT('[10, 20, [30, 40]]', '$[1]', '$[0]') | +----------------------------------------------------+ | [20, 10] | +----------------------------------------------------+ mysql> SELECT JSON_EXTRACT('[10, 20, [30, 40]]', '$[2][*]'); +-----------------------------------------------+ | JSON_EXTRACT('[10, 20, [30, 40]]', '$[2][*]') | +-----------------------------------------------+ | [30, 40] | +-----------------------------------------------+

在MySQL 5.7.9+里可以用"->"替代。

mysql> SELECT c, JSON_EXTRACT(c, "$.id"), g > FROM jemp > WHERE JSON_EXTRACT(c, "$.id") > 1 > ORDER BY JSON_EXTRACT(c, "$.name"); +-------------------------------+-----------+------+ | c | c->"$.id" | g | +-------------------------------+-----------+------+ | {"id": "3", "name": "Barney"} | "3" | 3 | | {"id": "4", "name": "Betty"} | "4" | 4 | | {"id": "2", "name": "Wilma"} | "2" | 2 | +-------------------------------+-----------+------+ 3 rows in set (0.00 sec) mysql> SELECT c, c->"$.id", g > FROM jemp > WHERE c->"$.id" > 1 > ORDER BY c->"$.name"; +-------------------------------+-----------+------+ | c | c->"$.id" | g | +-------------------------------+-----------+------+ | {"id": "3", "name": "Barney"} | "3" | 3 | | {"id": "4", "name": "Betty"} | "4" | 4 | | {"id": "2", "name": "Wilma"} | "2" | 2 | +-------------------------------+-----------+------+

在MySQL 5.7.13+，还可以用"->>"表示去掉抽取结果的"号，下面三种效果是一样的：

mysql> SELECT * FROM jemp WHERE g > 2; +-------------------------------+------+ | c | g | +-------------------------------+------+ | {"id": "3", "name": "Barney"} | 3 | | {"id": "4", "name": "Betty"} | 4 | +-------------------------------+------+ 2 rows in set (0.01 sec) mysql> SELECT c->'$.name' AS name -> FROM jemp WHERE g > 2; +----------+ | name | +----------+ | "Barney" | | "Betty" | +----------+ 2 rows in set (0.00 sec) mysql> SELECT JSON_UNQUOTE(c->'$.name') AS name -> FROM jemp WHERE g > 2; +--------+ | name | +--------+ | Barney | | Betty | +--------+ 2 rows in set (0.00 sec) mysql> SELECT c->>'$.name' AS name -> FROM jemp WHERE g > 2; +--------+ | name | +--------+ | Barney | | Betty | +--------+

JSON_KEYS(json_doc[, path])

获取json文档在指定路径下的所有键值，返回一个json array。如果有参数为NULL或path不存在，则返回NULL。