Question

如果有匹配项，则在sql中插入一行，然后对其进行更新。

我尝试过

INSERT INTO test (name, email)
SELECT * FROM (SELECT 'Rupert', 'Somewhere@s.com') AS tmp
WHERE NOT EXISTS (
    SELECT name FROM test WHERE name = 'Rupert'
) LIMIT 1;

Query OK, 1 row affected (0.00 sec)
Records: 1  Duplicates: 0  Warnings: 0

SELECT * FROM `test`;

+----+--------+-----------------+
| id | name   | email           |
+----+--------+-----------------+
|  1 | Rupert | Somewhere@s.com | 
+----+--------+-----------------+

这仅适用于检查重复项。但是我想如果没有发现问题，请插入它，而不是对其进行更新。

INSERT INTO test (name, email)
SELECT * FROM (SELECT 'Rupert', 'Somewhere@somewhere.com') AS tmp
WHERE NOT EXISTS (
    SELECT name FROM test WHERE name = 'Rupert'
) LIMIT 1;

Query OK, 1 row affected (0.00 sec)
Records: 1  Duplicates: 0  Warnings: 0

SELECT * FROM `test`;

+----+--------+-----------------+
| id | name   | email           |
+----+--------+-----------------+
|  1 | Rupert | Somewhere@s.com | 
+----+--------+-----------------+

Answer 1

您可以使用ON DUPLICATE KEY

首先，您必须创建唯一索引： ALTER TABLE测试ADD UNIQUE email(电子邮件`）;

因此，如果您插入具有相同电子邮件值的记录，它将更新该记录。

INSERT INTO test (name, email) VALUES("Rupert", "Somewhere@s.com") 
ON DUPLICATE KEY UPDATE name="Rupert", email="Somewhere@s.com"

如果是新电子邮件，它将创建新记录

Answer 2

首先，您需要运行此查询

ALTER TABLE test ADD CONSTRAINT email UNIQUE (email);

之后然后使用它会更新您的记录（如果存在）

INSERT INTO test (name,email) VALUES ('Gorilla','Somewhere@s.com') ON DUPLICATE KEY UPDATE email = "Somewhere@somewhere.com"

如果数据与其他匹配，如何在表中更新数据然后插入mysql

2 个答案: