如何在MySQL 5.7.10中更新JSON数据类型列? [英] How to update JSON data type column in MySQL 5.7.10?
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问题描述
我最近开始使用MySQL 5.7.10,我非常喜欢本机JSON数据类型.
I have started using MySQL 5.7.10 recently and I am liking the native JSON Data type a lot.
但是在更新JSON类型值时遇到了一个问题.
But I ran into a problem when it comes to updating a JSON type value.
问题:
以下是表格格式,在这里我想在t1
表格的JSON data
列中再添加1个键.现在,我必须获取值来修改它并更新表.因此,它涉及一个额外的SELECT
语句.
Below is the table format, here I want to add 1 more key in JSON data
column for t1
table. Right now I have to fetch the value modify it and Update the table. So it involves an extra SELECT
statement.
我可以这样插入
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)
是否可以解决此问题?
推荐答案
感谢@wchiquito为我指出正确的方向.我解决了问题.这是我的方法.
Thanks @wchiquito for pointing me right direction. I solved the problem. Here is how I did it.
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)
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