BCP导出数据转换

Question

ALTER PROCEDURE [dbo].[sp_helptext3] 
    (@ProcName VARCHAR(256))
AS
    SET NOCOUNT ON
BEGIN
    DECLARE @path VARCHAR(MAX)
    DECLARE @filepath_loction VARCHAR(MAX)

    SET @filepath_loction = '\\SOLVERLAPT292\tempfolder\new.txt'

    EXEC @path = sp_helptext2 @ProcName 

    SET @filepath_loction = @path
    SET @sql = 'bcp "' + @sql + '" queryout "' +  @filename +'" -c -r"''\n" 
-t"'',''" -S '+@@servername+' -T'

    SELECT @filepath_loction
END

输出我得到它因为没有转换成文本文件格式我得到这个错误：

  

Msg 214，Level 16，State 201，Procedure xp_cmdshell，Line 1
  过程需要'varchar'类型的参数'command_string'。