统计“一班”的学生个数

2014-10-25 16:27:47  访问(2304) 赞(0) 踩(0)

• 内容
• SQL语句
• SQL执行结果
• SlowX框架

• 
  

  提示：

  UTB_EXAM_STUDENT （学生表）

  UTB_EXAM_CLASS（班级表） 

  的连表操作

• select 
  count(s.ID) as '学生个数'
  from 
  UTB_EXAM_STUDENT s, UTB_EXAM_CLASS c
  where
  s.ClassId = c.ID and c.TheName = '一班'
  

• 
      /// <summary>
      /// 
      /// </summary>
      /// <param name="xdbHelper"></param>
      protected void DataBindTheContorls(DBHelper xdbHelper)
      {
          string theResult=null;
          bool bIsCreate = true;
  
          if (xdbHelper == null)
          {
              xdbHelper = SlowX.DAL.Helpers.DBHelper.CreateDBHelper();
          }
          else
          {
              // 没有打开链接 //
              bIsCreate = xdbHelper.IsNotOpen();
          }
  
          try
          {
              if (bIsCreate)
                  xdbHelper.OpenDBHelper();
  
              SlowX.ExamLib.Business.UTB_EXAM_STUDENT
                  bll
                  =
                  SlowX.ExamLib.Business.UTB_EXAM_STUDENT.instance;
  
              SlowX.ExamLib.Entity.UTB_EXAM_STUDENT
                  entity
                  =
                  new SlowX.ExamLib.Entity.UTB_EXAM_STUDENT();
  
              SlowX.ExamLib.Entity.UTB_EXAM_CLASS
                  entityClass
                  =
                  new SlowX.ExamLib.Entity.UTB_EXAM_CLASS();
  
              IFromTableDriver ifrom = entity;
              ifrom.AddIFromTableItemWithBaseEntity("tClass", entityClass);
  
              IQueryDriver iq = entity;
              iq.AddIQueryItemWithEntityFieldInfo(entity._ClassId, entityClass._ID);
              iq.AddIQueryItemWithEntityFieldInfo(entityClass._TheName, "一班");
  
              ISelectDriver iselect = entity;
              iselect.AddISelectItemWithEntityFieldInfo
                  ( 
                      entity._ID
                  );
  
              theResult = bll.Count(entity, xdbHelper).ToString();
  
              if (bIsCreate)
                  xdbHelper.EndDBHelper();
  
          }
          catch (Exception err)
          {
              if (bIsCreate)
                  xdbHelper.TranDBHelper();
  
              throw err;
          }
          finally
          {
              if (bIsCreate)
                  xdbHelper.FinallyDBHelper();
          }
  
          strResult = theResult;
      }
  

  
  select count(1) from UTB_EXAM_STUDENT t , 
  UTB_EXAM_CLASS tClass where t.ClassId = tClass.ID and tClass.TheName = '一班' 
  
  @tClassp1 = '一班'
  
  
  select count(1) from UTB_EXAM_STUDENT t , 
  UTB_EXAM_CLASS tClass where t.ClassId = tClass.ID and tClass.TheName = @tClassp1 
  
  @tClassp1 	 一班 	 String 	 Input 	 SqlParameter
  
  

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