0
我想插入两个值(复合键),只有当这些值不存在,否则Mysql会给出输入重复键的错误。凡不存在 - 错误1064(42000):您的SQL语法有错误;检查
我这个查询给错误:
INSERT INTO group_msg_response (license_id,grp_id) VALUES (1,1) WHERE NOT EXISTS (SELECT 1 FROM group_msg_response WHERE license_id=1 AND grp_id=1)
如果我运行它们单独他们都运行正常。
这是给这个错误:
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE NOT EXISTS (SELECT 1 FROM group_msg_response WHERE license_id=1 AND ' at line 1
可能是什么问题呢?我做的方式为https://dev.mysql.com/doc/refman/5.5/en/exists-and-not-exists-subqueries.html
这里提到的是表的定义:
create table IF NOT EXISTS msg(
id INT UNSIGNED AUTO_INCREMENT ,
en varchar(5000),
hi varchar(5000),
PRIMARY KEY(id)
) ENGINE=InnoDB;
create table IF NOT EXISTS group_msg(
id INT UNSIGNED AUTO_INCREMENT ,
msg_id INT UNSIGNED,
lsource INT UNSIGNED NOT NULL,
browser CHAR(1) NOT NULL DEFAULT 'a' ,
expiry_date DATETIME NOT NULL ,
dated DATETIME NOT NULL,
deleteit TINYINT DEFAULT 0 ,
FOREIGN KEY (msg_id)
REFERENCES msg(id)
ON DELETE CASCADE
ON UPDATE CASCADE,
PRIMARY KEY(id)
) ENGINE=InnoDB;
create table IF NOT EXISTS group_msg_response(
license_id MEDIUMINT,
grp_id INT UNSIGNED,
FOREIGN KEY (grp_id)
REFERENCES group_msg(id)
ON DELETE CASCADE
ON UPDATE CASCADE,
PRIMARY KEY(license_id,grp_id)
) ENGINE=InnoDB;
谢谢,但我希望有更简单的方法 – user5858
我发现,即使'INSERT IGNORE INTO'从http://stackoverflow.com/a/1361368/543087采取至少perfomance。我随它去。 – user5858
@ user5858。 。 。我建议你使用'ON DUPLICATE KEY UPDATE'。 'INSERT IGNORE'可能忽略你想要捕捉的其他错误。 –