出现错误“将 nvarchar 值 'egt1egt' 转换为数据类型 int 时转换失败。”

Question

我创建了一个 sql 过程来返回与用户名关联的密码。

SQL 过程：

USE [C:\INETPUB\WWWROOT\ADDMARKER\MAP\MAP\APP_DATA\ASPNETDB.MDF]
GO
/****** Object:  StoredProcedure [dbo].[aspnet_Membership_EmailPassword]    Script Date: 10/18/2012 15:32:02 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:      <Author,,Name>
-- Create date: <Create Date,,>
-- Description: <Description,,>
-- =============================================
ALTER PROCEDURE [dbo].[aspnet_Membership_EmailPassword] 
    -- Add the parameters for the stored procedure here
            (
            @UserName  nvarchar(256),
            @PasswordReturn nvarchar(128) out
            )
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
     DECLARE @UserId                                 uniqueidentifier
     DECLARE @Password                               nvarchar(128)
     DECLARE @Return_Password                         nvarchar(256)
     DECLARE @IsLockedOut                            bit
     DECLARE @ErrorCode     int
     SET @ErrorCode = 0

     DECLARE @TranStarted   bit
     SET @TranStarted = 0
      SET NOCOUNT ON;

IF( @@TRANCOUNT = 0 )
    BEGIN
        BEGIN TRANSACTION
        SET @TranStarted = 1
    END
    ELSE
        SET @TranStarted = 0

    SELECT  @UserId = u.UserId,
            @Password = m.Password,
            @IsLockedOut = m.IsLockedOut

    FROM    dbo.aspnet_Users u, dbo.aspnet_Membership m WITH ( UPDLOCK )
    WHERE    u.UserId = m.UserId AND
            LOWER(@UserName) = u.LoweredUserName

     IF ( @@rowcount = 0 )
    BEGIN
        SET @ErrorCode = 1
    END

    IF( @IsLockedOut = 1 )
    BEGIN
        SET @ErrorCode = 99
    END
    IF(Not( @ErrorCode = 0) )
    set @PasswordReturn = 'Error in search'
       ELSE
       set @PasswordReturn = @Password
       RETURN @PasswordReturn
END

我遇到错误

“消息 245，级别 16，状态 1，过程 aspnet_Membership_EmailPassword，第 59 行 将 nvarchar 值 'egt1egt' 转换为数据类型 int 时转换失败。"

在执行该程序时。

请问有人可以帮忙吗？

谢谢

Answer 1

Return只能返回一个int，它是过程的返回值。

退出过程会自动返回输出参数，所以去掉该行

 RETURN @PasswordReturn 

输出参数与返回值的区别详见http://msdn.microsoft.com/en-us/library/59x02y99(v=vs.71).aspx