Question

在以下存储过程中，我遇到了错误：

DROP PROCEDURE IF EXISTS `SP_DeleteFileInfo`;
CREATE  PROCEDURE `SP_DeleteFileInfo`(pFileID int)
Set @FileRef= null;
select filesinfo.ReferenceID into @FileRef FROM filesinfo where filesinfo.FileID =pFileID;
DELETE From filesinfo
WHERE filesinfo.FileID= pFileID;
IF EXISTS(SELECT * from filesrefrences where filesrefrences.ReferenceID= @FileRef and filesrefrences.RefrenceCount>1) then 
    update filesrefrences
    set 
        filesrefrences.RefrenceCount= filesrefrences.RefrenceCount-1
    where 
        filesrefrences.ReferenceID= @FileRef;
    SELECT @FileRef;
ELSE IF(@FileRef is Not NULL) THEN
    DELETE from filesrefrences WHERE filesrefrences.ReferenceID = @FileRef;
    SELECT -77;
ELSE
    SELECT -99;
end if;

遇到的错误是：

[SQL]
 select filesinfo.ReferenceID into @FileRef FROM filesinfo where filesinfo.FileID =pFileID;
[Err] 1054 - **Unknown column 'pFileID' in 'where clause'**

解决此错误的最佳解决方案是什么？

Answer 1

将pFileID定义为IN参数，例如

CREATE PROCEDURE SP_DeleteFileInfo(IN pFileID int)

完整查询，

DROP PROCEDURE IF EXISTS `SP_DeleteFileInfo`;
DELIMITER //
CREATE  PROCEDURE `SP_DeleteFileInfo`(IN pFileID int)
BEGIN
    Set @FileRef= null;
    select filesinfo.ReferenceID into @FileRef FROM filesinfo where filesinfo.FileID =pFileID;
    DELETE From filesinfo WHERE filesinfo.FileID= pFileID;
    IF EXISTS(SELECT * from filesrefrences where filesrefrences.ReferenceID= @FileRef and filesrefrences.RefrenceCount>1) then 
        update filesrefrences
        set  filesrefrences.RefrenceCount= filesrefrences.RefrenceCount-1
        where  filesrefrences.ReferenceID= @FileRef;
        SELECT @FileRef;
    ELSE 
        IF(@FileRef is Not NULL) THEN
            DELETE from filesrefrences WHERE filesrefrences.ReferenceID = @FileRef;
            SELECT -77;
        ELSE
            SELECT -99;
        END IF;
    END IF;
END //
DELIMITER ;

Answer 2

我必须添加额外的“结束IF”以涵盖“Else IF”声明完整的查询是这样的：

CREATE  PROCEDURE `SP_DeleteFileInfo`(IN pFileID int)
BEGIN    
Set @FileRef= null;
    select filesinfo.ReferenceID into @FileRef FROM filesinfo where filesinfo.FileID =pFileID;
    DELETE From filesinfo WHERE filesinfo.FileID= pFileID;
    IF EXISTS(SELECT * from filesrefrences where filesrefrences.ReferenceID= @FileRef and filesrefrences.RefrenceCount>1) then 
        update filesrefrences
        set  filesrefrences.RefrenceCount= filesrefrences.RefrenceCount-1
        where  filesrefrences.ReferenceID= @FileRef;
        SELECT @FileRef;
    ELSE IF(@FileRef is Not NULL) THEN
        DELETE from filesrefrences WHERE filesrefrences.ReferenceID = @FileRef;
        SELECT -77;
    ELSE
        SELECT -99;
    end if;
end if;
END;

Answer 3

您有多个语法错误

DROP PROCEDURE IF EXISTS `SP_DeleteFileInfo`;
-- MISSING DELIMITER //
CREATE  PROCEDURE `SP_DeleteFileInfo`(pFileID int)
-- MISSING BEGIN
  Set @FileRef= null;
  select filesinfo.ReferenceID into @FileRef FROM filesinfo where filesinfo.FileID =pFileID;
  DELETE From filesinfo
  WHERE filesinfo.FileID= pFileID;
  IF 
    EXISTS(SELECT * from filesrefrences where filesrefrences.ReferenceID= @FileRef and filesrefrences.RefrenceCount>1) 
  then 
    update filesrefrences
    set 
        filesrefrences.RefrenceCount= filesrefrences.RefrenceCount-1
    where 
        filesrefrences.ReferenceID= @FileRef;
    SELECT @FileRef;
  ELSE 
    IF
      (@FileRef is Not NULL) 
    THEN
      DELETE from filesrefrences WHERE filesrefrences.ReferenceID = @FileRef;
      SELECT -77;
    ELSE
      SELECT -99;
    end if;
-- MISSING END IF;
-- MISSING END//
-- MISSING DELIMITER ;

你得到这个错误

[SQL] select filesinfo.ReferenceID into @FileRef FROM filesinfo where filesinfo.FileID = pFileID; [错误] 1054 - 未知列'pFileID' 'where clause'

因为您创建的存储过程是

CREATE  PROCEDURE `SP_DeleteFileInfo`(pFileID int)
Set @FileRef= null;

所有其他陈述都是正常的单一陈述，因此{1}}在此背景下是未知的。

自己单独尝试这个select语句，你会得到同样的错误。

pFileID

如果和多个查询，MySql存储过程

3 个答案: