我最近開始使用 MySQL 5.7.10，我非常喜歡原生 JSON 資料類型。
但是在更新 JSON 類型值時我遇到了問題。
問題：
下面是表格格式，這裡我想在 data 列中為 t1 表新增 1 個鍵。現在我必須獲取值修改它並更新表。所以就牽涉到一個額外的SELECT語句。
我可以這樣插入
INSERT INTO t1 values ('{"key2":"value2"}', 1);
mysql> select * from t1;
+--------------------+------+
| data | id |
+--------------------+------+
| {"key1": "value1"} | 1 |
| {"key2": "value2"} | 2 |
| {"key2": "value2"} | 1 |
+--------------------+------+
3 rows in set (0.00 sec)
mysql>Show create table t1;
+-------+-------------------------------------------------------------
-------------------------------------------------------+
| Table | Create Table |
+-------+--------------------------------------------------------------------------------------------------------------------+
| t1 | CREATE TABLE `t1` (
`data` json DEFAULT NULL,
`id` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+-------+--------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
有解決辦法嗎？
現在使用 MySQL 5.7.22 ，可以非常簡單直接地在單一查詢中更新 json 的整個片段（多個鍵值，甚至嵌套），如下所示：
update t1 set data = JSON_MERGE_PATCH(`data`, '{"key2": "I am ID2", "key3": "I am ID3"}') where id = 2;希望它可以幫助訪問此頁面並尋找“更好”的
JSON_SET:) 有關JSON_MERGE_PATCH的更多資訊請參閱此處： https://dev.mysql .com/doc/refman/5.7/en/json-modification-functions.html#function_json-merge-patch感謝@wchiquito 為我指明了正確的方向。我解決了這個問題。這是我的做法。
mysql> select * from t1; +----------------------------------------+------+ | data | id | +----------------------------------------+------+ | {"key1": "value1", "key2": "VALUE2"} | 1 | | {"key2": "VALUE2"} | 2 | | {"key2": "VALUE2"} | 1 | | {"a": "x", "b": "y", "key2": "VALUE2"} | 1 | +----------------------------------------+------+ 4 rows in set (0.00 sec) mysql> update t1 set data = JSON_SET(data, "$.key2", "I am ID2") where id = 2; Query OK, 1 row affected (0.04 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> select * from t1; +----------------------------------------+------+ | data | id | +----------------------------------------+------+ | {"key1": "value1", "key2": "VALUE2"} | 1 | | {"key2": "I am ID2"} | 2 | | {"key2": "VALUE2"} | 1 | | {"a": "x", "b": "y", "key2": "VALUE2"} | 1 | +----------------------------------------+------+ 4 rows in set (0.00 sec) mysql> update t1 set data = JSON_SET(data, "$.key3", "I am ID3") where id = 2; Query OK, 1 row affected (0.07 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> select * from t1; +------------------------------------------+------+ | data | id | +------------------------------------------+------+ | {"key1": "value1", "key2": "VALUE2"} | 1 | | {"key2": "I am ID2", "key3": "I am ID3"} | 2 | | {"key2": "VALUE2"} | 1 | | {"a": "x", "b": "y", "key2": "VALUE2"} | 1 | +------------------------------------------+------+ 4 rows in set (0.00 sec)編輯： 如果要新增數組，請使用
JSON_ARRAY就像update t1 set data = JSON_SET(data, "$.key4", JSON_ARRAY('Hello','World!')) where id = 2;