Sql触发器的查询

Question

我正在尝试以下列格式为我的表创建自定义ID

2个随机字母 - 00MaxID

例如：AA-001

我曾尝试为它编写查询，但它无法正常工作，这是我第一次编写触发器也编写了一个复杂的查询，如此。

更新的-2

以下查询给出了“SELECT count（cus_id）INTO @ct FROM customer;”附近的错误。

CREATE
TRIGGER `id_gen` BEFORE INSERT
ON `testdb`.`customer`
FOR EACH ROW BEGIN

    SELECT count(cus_id) INTO @ct FROM customer;

    IF @ct < 1000 THEN
        SET @cs_id = LPAD(@ct+1, 3, 0 );
    ELSE
        SET @cs_id = @ct+1;
    END IF;

    SET NEW.cus_id = CONCAT(CHAR(FLOOR(65 + RAND() * 26),FLOOR(65 + RAND() * 26)),'-',@cs_id);

END;

错误

 SQL query: Documentation


CREATE
    TRIGGER `id_gen` BEFORE INSERT
    ON `testdb`.`customer`
    FOR EACH ROW BEGIN

        SELECT count(cus_id) INTO @ct FROM customer
MySQL said: Documentation

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 6

使用触发器部分执行

Answer 1

  

@Solarflare回答。

在屏幕截图中，您可以看到phpmyadmin自动添加了包含for each row的代码，该代码现在在语句中两次（因此错误）。您自己的代码将以begin开头。

BEGIN

    SELECT count(cus_id)+1 INTO @ct FROM customer;

    IF @ct < 1000 THEN
        SET @cs_id = LPAD(@ct, 3, 0 );
    ELSE
        SET @cs_id = @ct;
    END IF;

    SET NEW.cus_id = CONCAT(CHAR(FLOOR(65 + RAND() * 26),FLOOR(65 + RAND() * 26)),'-',@cs_id);

END;