MySQL存儲過程從select語句將值賦給多個變量

這是我的存儲過程。我有問題爲Declared變量賦值。當我執行它時，插入和更新命令正常工作，但聲明變量的VALUE保持爲0;但是我在數據庫中有一些價值。我如何正確地做到這一點。MySQL存儲過程從select語句將值賦給多個變量

BEGIN 
DECLARE PaidFee INT DEFAULT 0; 
DECLARE DueFee INT DEFAULT 0; 
DECLARE CourseFee INT DEFAULT 0; 
INSERT INTO `creditdirectory`(`TypeID`, `PersonName`, `CreditBy`, `PersonID`, `ModeOfPayment`,`Details`,`Amount`,`CompanyID`) 
VALUES(1,PersonName,CreditBy, AddmissionID, ModeOfPayment, 'Installment', PaidAmount, 
CompanyID); 
SELECT `CourseFee`,`PaidFee`,`DueFee` INTO CourseFee,PaidFee,DueFee FROM `studentcoursedetails` WHERE `ID`= CourseID; 
SET PaidFee = PaidFee + PaidAmount; 
SET DueFee = CourseFee - PaidFee; 
IF (NextDueDate !='') THEN 
UPDATE `studentcoursedetails` SET `PaidFee` = PaidFee, `DueFee` = DueFee, `DueDate` = NextDueDate WHERE `ID`= CourseID; 
ELSE 
UPDATE `studentcoursedetails` SET `PaidFee` = PaidFee, `DueFee` = DueFee, `DueDate` = NULL WHERE `ID` = CourseID; 
END IF; 
END

來源

2017-03-20 Manohar Kumar

使用變量名。或者設置你的列名的範圍。 – Solarflare

不要使用具有相同名稱列的變量，查詢將優先考慮表列名稱。

一個好主意是使用變量前綴：從您的列名不同

BEGIN 
    DECLARE p_PaidFee INT DEFAULT 0; 
    DECLARE p_DueFee INT DEFAULT 0; 
    DECLARE p_CourseFee INT DEFAULT 0; 
    INSERT INTO `creditdirectory`(`TypeID`, `PersonName`, `CreditBy`, `PersonID`, `ModeOfPayment`,`Details`,`Amount`,`CompanyID`) 
    VALUES(1,PersonName,CreditBy, AddmissionID, ModeOfPayment, 'Installment', PaidAmount, 
    CompanyID); 
    SELECT `CourseFee`,`PaidFee`,`DueFee` INTO p_CourseFee,p_PaidFee,p_DueFee FROM `studentcoursedetails` WHERE `ID`= CourseID; 
    SET p_PaidFee = p_PaidFee + PaidAmount; 
    SET p_DueFee = p_CourseFee - p_PaidFee; 
    IF (NextDueDate !='') THEN 
     UPDATE `studentcoursedetails` SET `PaidFee` = p_PaidFee, `DueFee` = p_DueFee, `DueDate` = NextDueDate WHERE `ID`= CourseID; 
    ELSE 
     UPDATE `studentcoursedetails` SET `PaidFee` = p_PaidFee, `DueFee` = p_DueFee, `DueDate` = NULL WHERE `ID` = CourseID; 
    END IF; 
END

來源

2017-03-22 15:51:13

MySQL存儲過程從select語句將值賦給多個變量

回答

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