MySQL是一种关系型数据库管理系统(RDBMS),它使用结构化查询语言(SQL)进行数据管理。在MySQL中,删除数据通常使用DELETE
语句。
innodb_lock_wait_timeout
参数设置等待超时时间。-- 检查外键约束
SHOW CREATE TABLE your_table;
-- 删除外键约束
ALTER TABLE your_table DROP FOREIGN KEY your_foreign_key;
-- 禁用触发器
DELIMITER //
CREATE PROCEDURE disable_triggers()
BEGIN
DECLARE done INT DEFAULT FALSE;
DECLARE trigger_name VARCHAR(255);
DECLARE cur CURSOR FOR SELECT trigger_name FROM information_schema.triggers WHERE event_object_schema = 'your_database' AND event_object_table = 'your_table';
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
OPEN cur;
read_loop: LOOP
FETCH cur INTO trigger_name;
IF done THEN
LEAVE read_loop;
END IF;
SET @sql = CONCAT('DROP TRIGGER ', trigger_name);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END LOOP;
END //
DELIMITER ;
CALL disable_triggers();
-- 删除数据
DELETE FROM your_table WHERE your_condition;
-- 提交事务
START TRANSACTION;
DELETE FROM your_table WHERE your_condition;
COMMIT;
希望这些信息能帮助你解决MySQL数据库删不掉的问题。
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