MemberShip 删除用户存储过程

ALTER     PROCEDURE   [ dbo ] .aspnet_Users_DeleteUser   -- 删除用户信息
     @ApplicationName    NVARCHAR ( 256 ),
     @UserName           NVARCHAR ( 256 ),
     @TablesToDeleteFrom   INT ,
     @NumTablesDeletedFrom   INT  OUTPUT
AS
/**/ /*因为用户的信息分开保存在多张表中,所以在删除某用户信息的 
  时候同时要在多张表中删除该用户的信息.所以下面才进行多个表的判断和操作.
  其中@TablesToDeleteFrom会接受由aspnet_Profile_DeleteProfiles传来的
  4,这个数用于对以下的于运算.这个存储过程还可能接受其他存储过程传过来的参数,不
   过目前我就看到这个. */
BEGIN
     DECLARE   @UserId                 UNIQUEIDENTIFIER
     SELECT    @UserId                 =   NULL
     SELECT    @NumTablesDeletedFrom   =   0

     DECLARE   @TranStarted     BIT
     SET   @TranStarted   =   0

     IF (  @@TRANCOUNT   =   0  )   -- 如果当前活动事务为0,开始事务并设置事务参数为1
     BEGIN
         BEGIN   TRANSACTION
         SET   @TranStarted   =   1
     END
     ELSE
     SET   @TranStarted   =   0

     DECLARE   @ErrorCode     INT    -- -声明错误代码
     DECLARE   @RowCount      INT     -- -声明行数

     SET   @ErrorCode   =   0
     SET   @RowCount    =   0

     SELECT    @UserId   =  u.UserId
     FROM     dbo.aspnet_Users u, dbo.aspnet_Applications a
     WHERE    u.LoweredUserName        =   LOWER ( @UserName )
         AND  u.ApplicationId          =  a.ApplicationId
         AND   LOWER ( @ApplicationName )  =  a.LoweredApplicationName
         /**/ /*从aspnet_Users和aspnet_Applications表中查询输入的@UserName的UserId并
              付给声明的@UserId*/


     IF  ( @UserId   IS   NULL )   -- 如果此用户不存在,跳转到回滚
     BEGIN
         GOTO  Cleanup
     END

     --  Delete from Membership table if (@TablesToDeleteFrom & 1) is set
     IF  (( @TablesToDeleteFrom   &   1 )  <>   0   AND
        ( EXISTS  ( SELECT  name  FROM  sysobjects  WHERE  (name  =  N ' aspnet_Membership ' )  AND  (type  =   ' U ' ))))
         /**/ /* &（按位 AND）在两个整型值之间执行按位逻辑与运算。
             后面是判断是否存在aspnet_Membership表,直接运行后面这条语句的结果是aspnet_Membership*/
         /**/ /*即输入参数@TablesToDeleteFrom不为0且存在aspnet_Membership表的话,执行以下*/

     BEGIN
         DELETE   FROM  dbo.aspnet_Membership  WHERE   @UserId   =  UserId
          -- -删除此用户的所有在aspnet_Membership表中的数据
         SELECT   @ErrorCode   =   @@ERROR ,
                @RowCount   =   @@ROWCOUNT

         IF (  @ErrorCode   <>   0  )  -- 如果有错误则跳转到回滚
             GOTO  Cleanup

         IF  ( @RowCount   <>   0 )  -- 如果受影响行数不为0,即操作影响了数据行,表示操作成功
             SELECT    @NumTablesDeletedFrom   =   @NumTablesDeletedFrom   +   1   -- 那个参数的值递增1
     END

     --  Delete from aspnet_UsersInRoles table if (@TablesToDeleteFrom & 2) is set
     IF  (( @TablesToDeleteFrom   &   2 )  <>   0    AND
        ( EXISTS  ( SELECT  name  FROM  sysobjects  WHERE  (name  =  N ' aspnet_UsersInRoles ' )  AND  (type  =   ' U ' ))) )
        /**/ /*如果@TablesToDeleteFrom不为0且存在aspnet_UsersInRoles,执行以下*/

     BEGIN
         DELETE   FROM  dbo.aspnet_UsersInRoles  WHERE   @UserId   =  UserId
          /**/ /*从aspnet_UsersInRoles表删除此用户的所有数据信息*/   
        

         SELECT   @ErrorCode   =   @@ERROR ,
                 @RowCount   =   @@ROWCOUNT

         IF (  @ErrorCode   <>   0  )  -- 如果有错则回滚
             GOTO  Cleanup

         IF  ( @RowCount   <>   0 )  -- 如果操作成功为@NumTablesDeletedFrom递增1
             SELECT    @NumTablesDeletedFrom   =   @NumTablesDeletedFrom   +   1
     END

     --  Delete from aspnet_Profile table if (@TablesToDeleteFrom & 4) is set
     IF  (( @TablesToDeleteFrom   &   4 )  <>   0    AND
        ( EXISTS  ( SELECT  name  FROM  sysobjects  WHERE  (name  =  N ' aspnet_Profile ' )  AND  (type  =   ' U ' ))) )
           /**/ /*如果@TablesToDeleteFrom不为0且存在aspnet_Profile,执行以下*/

     BEGIN
         DELETE   FROM  dbo.aspnet_Profile  WHERE   @UserId   =  UserId
           /**/ /*从aspnet_Profile删除此用户的所有数据*/
         SELECT   @ErrorCode   =   @@ERROR ,
                 @RowCount   =   @@ROWCOUNT

         IF (  @ErrorCode   <>   0  )  -- 有错误则回滚
             GOTO  Cleanup

         IF  ( @RowCount   <>   0 )   -- 成功则为@NumTablesDeletedFrom递增1
             SELECT    @NumTablesDeletedFrom   =   @NumTablesDeletedFrom   +   1
     END

     --  Delete from aspnet_PersonalizationPerUser table if (@TablesToDeleteFrom & 8) is set
     IF  (( @TablesToDeleteFrom   &   8 )  <>   0    AND
        ( EXISTS  ( SELECT  name  FROM  sysobjects  WHERE  (name  =  N ' aspnet_PersonalizationPerUser ' )  AND  (type  =   ' U ' ))) )
            /**/ /*如果@TablesToDeleteFrom不为0且存在aspnet_PersonalizationPerUser,执行以下*/

     BEGIN
         DELETE   FROM  dbo.aspnet_PersonalizationPerUser  WHERE   @UserId   =  UserId
             /**/ /*从aspnet_PersonalizationPerUser表删除此用户的所有数据信息*/   
         SELECT   @ErrorCode   =   @@ERROR ,
                 @RowCount   =   @@ROWCOUNT

         IF (  @ErrorCode   <>   0  )  -- 有错误则跳转到回滚段
             GOTO  Cleanup

         IF  ( @RowCount   <>   0 )   -- 成功则为@NumTablesDeletedFrom的值递增1
             SELECT    @NumTablesDeletedFrom   =   @NumTablesDeletedFrom   +   1
     END

     --  Delete from aspnet_Users table if (@TablesToDeleteFrom & 1,2,4 & 8) are all set
     IF  (( @TablesToDeleteFrom   &   1 )  <>   0   AND
        ( @TablesToDeleteFrom   &   2 )  <>   0   AND
        ( @TablesToDeleteFrom   &   4 )  <>   0   AND
        ( @TablesToDeleteFrom   &   8 )  <>   0   AND
        ( EXISTS  ( SELECT  UserId  FROM  dbo.aspnet_Users  WHERE   @UserId   =  UserId)))
        /**/ /*如果全部按位于都不为0且aspnet_Users表中是否存在此用户
           其实1,2,4,8和1按位于都不为0*/

     BEGIN
         DELETE   FROM  dbo.aspnet_Users  WHERE   @UserId   =  UserId
           /**/ /*删除aspnet_Users中此用户的数据*/

         SELECT   @ErrorCode   =   @@ERROR ,
                 @RowCount   =   @@ROWCOUNT

         IF (  @ErrorCode   <>   0  )  -- 有错误则跳转到回滚段
             GOTO  Cleanup

         IF  ( @RowCount   <>   0 )    -- 成功则为@NumTablesDeletedFrom值递增1
             SELECT    @NumTablesDeletedFrom   =   @NumTablesDeletedFrom   +   1
     END

     IF (  @TranStarted   =   1  )  -- 如果事务正常开始到这里
     BEGIN
         SET   @TranStarted   =   0   -- 重新设置为0
         COMMIT   TRANSACTION     -- 结束事务
     END

     RETURN   0

Cleanup:   -- -这就是传说中的跳转部分
     SET   @NumTablesDeletedFrom   =   0

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

     RETURN   @ErrorCode

END