Question

以下是我的存储过程示例，有人可以帮我解决以下错误：

'Msg 22027, Level 15, State 1, Line 0
Usage:  EXECUTE xp_fileexist <filename> [, <file_exists INT> OUTPUT]
Msg 245, Level 16, State 1, Procedure TextImpoted01, Line 39
Conversion failed when converting the varchar value 'No' to data type int.'

USE [test]

GO
SET ANSI_NULLS ON

GO    
SET QUOTED_IDENTIFIER ON

GO


ALTER PROCEDURE [dbo].[TextImpoted01]    
AS

SET NOCOUNT ON;

DECLARE @SQL NVARCHAR(100) 

SELECT TOP (1) @SQL = total  FROM DealCounter


DECLARE @path NVARCHAR(max)    
SET @path = 'c:\temp\TextImpoted'+ @SQL + '.txt'    


DECLARE @UpdateSQL NVARCHAR(100)     
SET @UpdateSQL = N'UPDATE    DealCounter  SET total = total  + 1' 


DECLARE @LOOP NVARCHAR(100)     
SELECT TOP (1) @LOOP = total  FROM DealCounter

DECLARE @bulk_cmd NVARCHAR(max);
DECLARE @isExists INT


WHILE @SQL <= @LOOP + 1000
BEGIN

    SET @path = 'c:\temp\TextImpoted'+ @SQL + '.txt'    
    exec master.dbo.xp_fileexist @path ,isExists out


    SELECT  case @isExists 
                when 1 then 'Yes'     
                else 'No'    
            end as isExists


    if @isExists = 'No'    
        BREAK

    else
        SET @bulk_cmd = 'BULK INSERT TextImpoted FROM '''+ @path + ''' 
                WITH 
                (
                FIELDTERMINATOR = ' + ''';''' +  ',       ROWTERMINATOR = ' + '''\n'''+ ')';

    EXEC sp_executesql @bulk_cmd

    EXECUTE sp_executesql @UpdateSQL;

    set @SQL = @SQL + 1;


END

Answer 1

你的问题实际上并不涉及循环。

您在@isExists声明integer：

DECLARE @isExists INT

在这里，您将其与varchar值进行比较。

if @isExists = 'No'

这会产生您已经看过的错误。

还要注意这行代码：

exec master.dbo.xp_fileexist @path ,isExists out

肯定应该是@isExists，而你却错过了@

Answer 2

首先：exec master.dbo.xp_fileexist @path ,isExists out的输出变量缺少@符号，应为exec master.dbo.xp_fileexist @path , @isExists out。

第二：错误来自于尝试将INT变量@isExists与case语句中的char值进行比较。

case块是多余的，但可以替换为：

EXEC master.dbo.xp_fileexist @path ,@isExists OUT
IF (@isExists = 1)
    BEGIN
       (... your logic here ... )
    END

将LOOP添加到我的存储过程

2 个答案: