mysql - while 程序错误

Question

你知道为什么它不起作用吗？

CREATE TABLE IF NOT EXISTS `a_loop` (
  `id` int(11) NOT NULL DEFAULT '0',
  `num` varchar(50) NOT NULL DEFAULT ''
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

DELIMITER $$
CREATE PROCEDURE test_a_loop()
BEGIN
    DECLARE x  INT;
    DECLARE str VARCHAR(255);    
    SET x = 0;
    SET str =  '';
    WHILE x < 5 DO
    SET x = x + 1;
    SET str =  CONCAT('num-', x);
    INSERT INTO a_loop (id,num) VALUES (x, str);
    END WHILE;
END$$
DELIMITER;

我收到错误

#1064 - 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 'DELIMITER' at line 1

Answer 1

只需在分隔符后添加一个空格:) 失败的代码

DELIMITER $$
CREATE PROCEDURE test_a_loop()
BEGIN
    DECLARE x  INT;
    DECLARE str  VARCHAR(255);   
    SET x = 0;
    SET str =  '';
    WHILE x < 5 DO
    SET x = x + 1;
    SET str =  CONCAT('num-', x);
    INSERT INTO a_loop (id,num) VALUES (x, str);
    END WHILE;
END$$
DELIMITER;

空格后:

DELIMITER $$
CREATE PROCEDURE test_a_loop()
BEGIN
    DECLARE x  INT;
    DECLARE str  VARCHAR(255);   
    SET x = 0;
    SET str =  '';
    WHILE x < 5 DO
    SET x = x + 1;
    SET str =  CONCAT('num-', x);
    INSERT INTO a_loop (id,num) VALUES (x, str);
    END WHILE;
END$$
DELIMITER ;