1:可以使用CAST(… AS JSON)进行转换 -- 使用 CAST( AS JSON)转换 SELECT CAST('[4,5]' AS JSON) MEMBER OF('[[3,4],[4,5]]'); 1. 2. 2:使用JSON_ARRAY函数转换 SELECT JSON_ARRAY(4,5) MEMBER OF('[[3,4],[4,5]]'); 1. 【4】注意事项 对需要进行针对目标JSON数组匹配的值要求使...
在MySQL8.0中,CAST(value AS JSON)函数会尝试将给定的值转化为一个有效的JSON格式字符串。语法结构如下: CAST(value AS JSON) mysql> SELECT CAST('["apple", "banana", "cherry"]' AS JSON) AS json1, CAST('{"name":"CoderAcademy", "age": 30}' AS JSON ) AS json2; +---+---+ | jso...
{}:空的键值对,可以用cast('{}' as JSON)来设置; []:空的数组,可以用cast('[] as JSON')来设置,注意这里并不是集合的概念,里面的值是允许重复的; {'k':'v'}:有键值对的数组,可以用cast来设置; mysql>select*fromtest_json;+---+---+---+|id|j|name|+---+---+---+|1|{"url": "...
在MySQL中,转换VARCHAR为JSON可以使用内置的JSON函数。以下是基本语法: SELECTJSON_OBJECT('key1',value1,'key2',value2); 1. 然而,如果你的VARCHAR格式已经存储了合适的JSON字符串,可以直接使用CAST函数将VARCHAR转换为JSON。示例如下: SELECTCAST(your_varchar_columnASJSON)ASjson_dataFROMyour_table; 1. 2. ...
mysql>SELECT*FROMtestprojectWHEREstudent=CAST('{"id": 1, "name": "ggjg"}'asJSON);+---+---+---+|id|skill|student|+---+---+---+|10|["java","go","vue"]|{"id":1,"name":"ggjg"}|+---+---+---+1rowinset
This also works with JSON array values, as shown here: mysql> CREATE TABLE tj10 (a JSON, b INT); Query OK, 0 rows affected (0.26 sec) mysql> INSERT INTO tj10 > VALUES ("[3,10,5,17,44]", 33), ("[3,10,5,17,[22,44,66]]", 0); Query OK, 1 row affected (0.04 sec...
00 sec) mysql> select cast('[4,5]' as json) member of('[[3,4],[4,5]]'); +---+ | cast('[4,5]' as json) member of('[[3,4],[4,5]]') | +---+ | 1 | +---+ 1 row
SELECTjson_contains(json'{"a": 1, "b": 2, "c": {"d": 4}}', json'1','$.a')asresult; 返回结果如下: +---+|result|+---+|1|+---+ 判断$.b的路径下是否包含值1,语句如下: SELECTjson_contains(json'{"a": 1, "b": 2, "c": {"d": 4}}', json'1','$.b')asresult...
如果导入源为云原生数据仓库AnalyticDB MySQL, 对于JSON类型字段需要转换为VARCHAR类型后进行导入,例如detail字段为JSON类型,可以使用cast(detail as VARCHAR) as detail进行转换。关于CAST函数,请参见CAST函数。 前提条件 已创建MySQL数据库,并已设置具备最小读权限的数据库账号。