如何在mysql CONCAT函数中使用自动增量值？

Question

我有这个问题：

我想像这样在图像表中插入新行：

INSERT INTO image (pr_id, kelias, tipas) VALUES(111111, CONCAT('1111111111', '_', image.id, '.jpg'), '0')

但是当我每次尝试输入CONCAT值或每次返回0时，image.id函数都会出错。

[image.id是自动递增。

Answer 1

您可以使用BEFORE INSERT触发器-

CREATE TRIGGER trigger1
  BEFORE INSERT
  ON image
  FOR EACH ROW
BEGIN
  SET NEW.kelias = CONCAT(NEW.kelias, NEW.pr_id);
END

Answer 2

尝试

INSERT INTO image (pr_id, kelias, tipas)
SELECT 11111, 
       CONCAT('1111111111', '_', max(image.id) + 1, '.jpg'), 
       '0'
FROM image

Answer 3

mysql_query("INSERT INTO image (kelias, tipas) VALUES('anything', '0')");
$img_id = mysql_insert_id();
$kelias = '1111111111' . '_' . $img_id . '.jpg';
mysql_query("UPDATE image SET kelias='$kelias' WHERE pr_id = $img_id");

Answer 4

您可以使用BEFORE INSERT触发器-

CREATE TRIGGER trigger1
  BEFORE INSERT
  ON image
  FOR EACH ROW
BEGIN
  SET NEW.kelias = CONCAT( NEW.kelias , '_', 

  (SELECT AUTO_INCREMENT
  FROM information_schema.TABLES
  WHERE TABLE_SCHEMA = "<your database name here>"
  AND TABLE_NAME = "image" )

  , '.jpg');
END

然后通过：]获得所需的结果>

INSERT INTO image (pr_id, kelias, tipas) VALUES(111111, '1111111111', '0')