mysql更新所有表

-- 示例：分批更新时间戳字段
DELIMITER $$
CREATE PROCEDURE update_timestamps_in_batches()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE table_name VARCHAR(255);
    DECLARE cur CURSOR FOR SELECT table_name FROM information_schema.tables WHERE table_schema = 'your_database_name';
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur;
    read_loop: LOOP
        FETCH cur INTO table_name;
        IF done THEN
            LEAVE read_loop;
        END IF;
        SET @sql = CONCAT('UPDATE ', table_name, ' SET updated_at = NOW() WHERE id > ', (SELECT COALESCE(MAX(id), 0) FROM ", table_name, "));
        PREPARE stmt FROM @sql;
        EXECUTE stmt;
        DEALLOCATE PREPARE stmt;
    END LOOP;
    CLOSE cur;
END$$
DELIMITER ;
CALL update_timestamps_in_batches();

-- 示例：使用事务和加锁
START TRANSACTION;
LOCK TABLES your_table_name WRITE;
UPDATE your_table_name SET column_name = 'new_value' WHERE condition;
COMMIT;
UNLOCK TABLES;