SQL查询-如何使用gridview的XML路径查询显示单行

本文关键字：查询 XML 路径 单行 显示 gridview 何使用 SQL | 更新日期: 2023-09-27 18:11:30

我有3个表，我从(ModuleStaff, Staff, Roles)检索。我打算做的是在单行中显示gridview中的数据。例如，负责组号1和组号2的staff(adrian)显示为:

StaffName |  RoleName |  GroupNumber
Adrian    |  Lecturer |  1,2

现在，我有相同的staff(adrian)问题，但有不同的角色名称，有groupnumbers (1 and 2)，即使它的数据库数据为导师和领导者空白。

我现在得到了什么:

StaffName |  RoleName |  GroupNumber
Adrian    |  Lecturer |  1,2
Adrian    |  Tutor    |  1,2
Adrian    |  Leader   |  1,2

应该是什么:

StaffName |  RoleName |  GroupNumber
Adrian    |  Lecturer |  1,2
Adrian    |  Tutor    |  
Adrian    |  Leader   |
下面是我的代码: 
public DataTable DisplayModuleStaffGroup(string year, string module, string diploma)
{
    try
    {
        using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["MARSConnectionString"].ConnectionString))
        {
            using (SqlCommand cmd = con.CreateCommand())
            {
                cmd.CommandText = "SELECT ms.ModuleCode, ms.ModuleYear, ms.DiplomaID, sr.RoleName, s.StaffName, s.StaffStatus, GroupNumber = ";
                cmd.CommandText += " substring((SELECT ( ', ' + GroupNumber ) FROM ModuleStaff ms2, Staff s2 ";
                cmd.CommandText += " WHERE ms.StaffID = ms2.StaffID AND ms2.StaffID = s2.StaffID ";
                cmd.CommandText += " ORDER BY s2.StaffName, ms2.GroupNumber ";
                cmd.CommandText += " FOR XML PATH( '' )), 3, 1000) ";
                cmd.CommandText += " FROM ModuleStaff ms ";
                cmd.CommandText += " INNER JOIN StaffRoles sr ON ms.RoleID = sr.RoleID ";
                cmd.CommandText += " INNER JOIN Diploma d ON ms.DiplomaID = d.DiplomaID ";
                cmd.CommandText += " INNER JOIN Staff s ON ms.StaffID = s.StaffID ";
                cmd.CommandText += " WHERE (ms.DiplomaID = @dip) AND (ms.ModuleYear = @year) AND (ms.ModuleCode = @code) ";
                cmd.CommandText += " ORDER BY ms.RoleID DESC ";
cmd.Parameters.AddWithValue("@dip", diploma);
                cmd.Parameters.AddWithValue("@year", year);
                cmd.Parameters.AddWithValue("@code", module);
                DataSet dSet = new DataSet();
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                    da.Fill(dSet, "DisplayModuleStaffGroup");
                    return dSet.Tables["DisplayModuleStaffGroup"];
                }
            }
        }
    }
    catch
    {
        throw;
    }
    finally
    {
    }
}

我不太确定我应该如何查询XML路径/sql语句给我基于rolename和staffname的组号。有人能帮我一下吗?谢谢你。

SQL查询-如何使用gridview的XML路径查询显示单行

您可以在sql中遍历循环。下面是你可以应用

的想法
declare @totalStaff int
declare @totalRoles int
declare @staffCount int
declare @roleCount int
declare @staffId int
declare @staffName varchar(max)
declare @roleId int
declare @roleName varchar(max)
declare @groupCount int
declare @table table(staffName varchar(max),roleName varchar(max),roles varchar(max))
set @staffCount=1
set @roleCount=1
set @totalStaff=(select count(*) from staff)
while(@staffCount<=@totalStaff)
begin
   set @staffId=select a.ID from
                  (select row_number() over(order by ID) as sr,ID from satff)a
           where a.sr=@staffCount
    set @staffName=(select staffName from staff where staffId=@staffId)
    set @totalRoles=(select count(*) from roles where staffId=@staffId)
    while(@roleCount<=@totalRoles)
    begin
    set @roleId=select a.ID from
                (select row_number() over(order by ID) as sr,ID from roles)a
                where a.sr=@roleCount
    set @roleName=(select roleName from roles where roleId=@roleId)
     --now same as above go through the loop for group 
    end
end
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