mySql中创建过程的语法错误

Question

DELIMITER $$
DROP PROCEDURE IF EXISTS `unitstoamount`;
CREATE DEFINER=`root`@`localhost` PROCEDURE `unitstoamount`( IN units INT(14) , OUT result INT(14))
BEGIN

    DECLARE a INT(14) DEFAULT 0;
    DECLARE b INT(14) DEFAULT 0;
    DECLARE c INT(14) DEFAULT 0;

    SELECT twohundred FROM unitsRate INTO a ;
    SELECT fivehundred FROM unitsRate INTO b ;
    SELECT thousand FROM unitsRate INTO c  ;

    IF units<200
    then
        SELECT a*units INTO result;

    ELSEIF units<500
    then
        SELECT (a*200)+(b*(units-200)) INTO result;
    ELSEIF units > 500
    then
        SELECT (a*200)+(b*(300))+(c*(units-500)) INTO result;
    END IF;

END$$
DELIMITER ;

Answer 1

您已将DELIMITER设置为$$。因此，您还应该在DROP PROCEDURE语句中使用它：

DELIMITER $$
DROP PROCEDURE IF EXISTS `unitstoamount`
$$
CREATE DEFINER=`root`@`localhost` PROCEDURE `unitstoamount`( IN units INT(14) , OUT result INT(14))
...