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|
mysql> select json_extract('[10, 20, [30, 40]]', '$[1]');
+
| json_extract('[10, 20, [30, 40]]', '$[1]') |
+
| 20 |
+
1 row in set (0.00 sec)
mysql> select
-> json_extract(data, '$.name'),
-> json_extract(data, '$.address')
-> from user;
+
| json_extract(data, '$.name') | json_extract(data, '$.address') |
+
| "tom" | "SZ" |
| "jim" | NULL |
+
2 rows in set (0.00 sec)
mysql> select json_object("name", "jery", "email", "jery@163.com", "age",33);
+
| json_object("name", "jery", "email", "jery@163.com", "age",33) |
+
| {"age": 33, "name": "jery", "email": "jery@163.com"} | -- 封装成了K-V对
+
1 row in set (0.00 sec)
mysql> insert into user values (
-> null,
-> json_object("name", "jery", "email", "jery@163.com", "age",33)
-> );
Query OK, 1 row affected (0.03 sec)
mysql> select * from user;
+
| uid | data |
+
| 1 | {"age": 18, "name": "tom", "address": "SZ"} |
| 2 | {"age": 28, "mail": "jim@163.com", "name": "jim"} |
| 4 | {"age": 33, "name": "jery", "email": "jery@163.com"} |
+
3 rows in set (0.00 sec)
mysql> set @j = '{ "a": 1, "b": [2, 3]}';
Query OK, 0 rows affected (0.00 sec)
mysql> select json_insert(@j, '$.a', 10, '$.c', '[true, false]');
+
| json_insert(@j, '$.a', 10, '$.c', '[true, false]') |
+
| {"a": 1, "b": [2, 3], "c": "[true, false]"} | -- a还是=1，存在的被忽略，不受影响
+
1 row in set (0.00 sec)
mysql> update user set data = json_insert(data, "$.address_2", "BJ") where uid = 1;
Query OK, 1 row affected (0.03 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from user;
+
| uid | data |
+
| 1 | {"age": 18, "name": "tom", "address": "SZ", "address_2": "BJ"} | -- 增加了addres_2 : "BJ"
| 2 | {"age": 28, "mail": "jim@163.com", "name": "jim"} |
| 4 | {"age": 33, "name": "jery", "email": "jery@163.com"} |
+
3 rows in set (0.00 sec)
mysql> select json_merge('{"name": "x"}', '{"id": 47}');
+
| json_merge('{"name": "x"}', '{"id": 47}') |
+
| {"id": 47, "name": "x"} | -- 合并多个JSON
+
1 row in set (0.00 sec)
mysql> select
-> json_merge(
-> json_extract(data, '$.address'),
-> json_extract(data, '$.address_2'))
-> from user where uid = 1;
+
| json_merge( json_extract(data, '$.address'), json_extract(data, '$.address_2')) |
+
| ["SZ", "BJ"] |
+
1 row in set (0.00 sec)
mysql> set @j = '["a", ["b", "c"], "d"]';
Query OK, 0 rows affected (0.00 sec)
mysql> select json_array_append(@j, '$[1]', 1);
+
| json_array_append(@j, '$[1]', 1) |
+
| ["a", ["b", "c", 1], "d"] |
+
1 row in set (0.00 sec)
mysql> update user set data = json_array_append(
-> data,
-> '$.address',
-> json_extract(data, '$.address_2'))
-> where uid = 1;
Query OK, 1 row affected (0.02 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from user;
+
| uid | data |
+
| 1 | {"age": 18, "name": "tom", "address": ["SZ", "BJ"], "address_2": "BJ"} | --address_2追加到address
| 2 | {"age": 28, "mail": "jim@163.com", "name": "jim"} |
| 4 | {"age": 33, "name": "jery", "email": "jery@163.com"} |
+
3 rows in set (0.00 sec)
mysql> set @j = '["a", ["b", "c"], "d"]';
Query OK, 0 rows affected (0.00 sec)
mysql> select json_remove(@j, '$[1]');
+
| json_remove(@j, '$[1]') |
+
| ["a", "d"] |
+
1 row in set (0.00 sec)
mysql> update user set data = json_remove(data, "$.address_2") where uid = 1;
Query OK, 1 row affected (0.03 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from user;
+
| uid | data |
+
| 1 | {"age": 18, "name": "tom", "address": ["SZ", "BJ"]} | -- address_2 的字段删除了
| 2 | {"age": 28, "mail": "jim@163.com", "name": "jim"} |
| 4 | {"age": 33, "name": "jery", "email": "jery@163.com"} |
+
3 rows in set (0.00 sec)
|