存储过程返回很多记录，但数据读取器只能看到一个记录

Question

我创建了一个SQL Server存储过程，我在其中使用游标并创建了一个ASP.NET方法来执行该过程。我正在使用SqlDataReader和while(reader.Read())来读取值。问题是存储过程中的游标返回很多行，但该方法只读取第一条记录。任何人都可以帮忙

存储过程：

create procedure [dbo].[GetMenusUserGroupCanView] 
(
    @UserGroupID int 
,@LanguageID int 
) as begin 

    declare @MenuID int 

    declare @Title varchar(255) 

    declare db_cursor cursor for 
    (
     select MenuID 
     from TrioGate.dbo.Sys_UserGroupMenus 
     where UserGroupID=@UserGroupID and ViewFlag='true' 
    ) 

    open db_cursor 

    fetch next from db_cursor into @MenuID 

    while @@fetch_status = 0 begin 

     select 
     Sys_Menus.MenuID 
     ,Sys_Menus.ParentMenuID 
     ,Sys_Menus.DescriptionLabelID 
     ,Sys_Menus.TitleLabelID 
     ,Sys_Menus.TooltipLabelID 
     ,Sys_Menus.[Icon] 
     ,Sys_Menus.[MenuName] 
     ,Sys_Menus.[MenuTypeID] as MenuType 
     ,[dbo].[Get_ParentMenu_Name](Sys_Menus.ParentMenuID) as ParentMenuName 
     ,[dbo].[Get_Label_Description](Sys_Menus.TitleLabelID,1) as Title 
     ,[dbo].[Get_Label_Description](Sys_Menus.TooltipLabelID,1) as Tooltip 
     ,[dbo].[Get_Label_Description](Sys_Menus.DescriptionLabelID,1) as [Description] 
     ,Sys_Menus.[MainTableName] as [Table] 
     ,Sys_Menus.[Seq],Sys_Menus.[MenuPath],Sys_Menus.ActivateLog,Sys_Menus.MenuID 
     from Sys_Menus 
      left join Sys_LabelDetails 
      on Sys_Menus[TitleLabelID] = Sys_LabelDetails[LabelID] 
     where Sys_LabelDetails.LanguageID = @LanguageID 
     and MenuID = @MenuID  

     fetch next from db_cursor into @MenuID 

    end 

    close db_cursor 
    deallocate db_cursor 

end 

方法：

public List<Menu> GetMenusUserGroupCanView(int UserGroupID, int LanguageID) 
{ 
    List<Menu> list = new List<Menu>(); 
    SqlCommand cmd = new SqlCommand("GetMenusUserGroupCanView ", Connection); 
    cmd.CommandType = CommandType.StoredProcedure; 
    cmd.Parameters.AddWithValue("@UserGroupID", UserGroupID); 
    cmd.Parameters.AddWithValue("@LanguageID", LanguageID); 
    try 
    { 

     Connection.Open(); 
     SqlDataReader reader = cmd.ExecuteReader(); 
     while (reader.Read()) 
     { 
      Menu entry = new Menu(); 
      entry.MenuID = (int)reader["MenuID"]; 
      entry.ParentMenuID = (int)reader["ParentMenuID"]; 
      entry.ActivateLog = (bool)reader["ActivateLog"]; 
      entry.Description = reader["Description"].ToString(); 
      entry.DescriptionLabelID = (int)reader["DescriptionLabelID"]; 
      entry.Icon = (byte[])reader["Icon"]; 
      entry.MainTableName = reader["Table"].ToString(); 

      entry.MenuName = reader["MenuName"].ToString(); 
      entry.MenuPath = reader["MenuPath"].ToString(); 
      entry.MenuTypeID = reader["MenuType"].ToString(); 
      entry.ParentMenuName = reader["ParentMenuName"].ToString(); 
      entry.Seq = (int)reader["Seq"]; 

      entry.Title = reader["Title"].ToString(); 
      entry.TitleLabelID = (int)reader["TitleLabelID"]; 
      entry.Tooltip = reader["Tooltip"].ToString(); 
      entry.ToolTipLabelID = (int)reader["ToolTipLabelID"]; 
      list.Add(entry); 
     } 

    } 
    catch { } 
    finally 
    { 
     Connection.Close(); 
    } 
    return list; 
}  

Answer 1

你的循环的每次迭代进行选择。所以，而不是一套记录，你会得到多个集。

选择你的命运：

A.（治疗症状）：提前结果集之间的读者IDataReader. NextResult()

或B.（解决问题）：有没有必要的光标; 使用连接代替：

select 
* /* dump your columns back in here */ 
from Sys_UserGroupMenus as g 
    join Sys_Menus as m 
     join Sys_LabelDetails as d 
     on d.LabelID = m.TitleLabelID 
     and d.LanguageID = @LanguageID 
    on m.MenuID = g.MenuID 
where g.UserGroupID = @UserGroupID 
and g.ViewFlag = 'true'