MySql 5.7 json 类型操作

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1、建表
CREATE TABLE `t_json_test` (
  `id` int(11) NOT NULL,
  `c_json` json DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

2、插入数据
insert into t_json_test values (1, '{"p1":1,"p2":"ppp111"}'), (2, '{"p1":2,"p2":"ppp222"}');

3、查询
select json_extract(c_json, '$.p1') as p1, json_extract(c_json, '$.p2') as p2 from t_json_test;
select c_json->'$.p1' as p1, c_json->'$.p2' as p2   from t_json_test;

4、给JSON字段插入新值，但不覆盖
update t_json_test set c_json=JSON_INSERT(c_json, '$.p3', "PPP333") WHERE ID = 1;

5、给JSON字段插入新值，如果已存在，则覆盖已存在的值
update t_json_test set c_json=JSON_SET(c_json, '$.p3', "PPP3444") WHERE ID = 1;

6、只替换已存在的值
update t_json_test set c_json=JSON_REPLACE(c_json, '$.p4', "PPP666") WHERE ID = 1;

7、删除属性，可删除多个
update t_json_test set c_json=JSON_REMOVE(c_json, '$.p2', '$.p3') WHERE ID = 1;

8、以json属性为条件查询
SELECT * FROM t_json_test where json_extract(c_json, '$.p2') like '%p%'

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