统计有多少个学生

2014-10-24 23:24:54 访问(2370) 赞(0) 踩(0)

提示：单表操作，对数据库方法的使用
```
select count(1) from UTB_EXAM_STUDENT
```


    /// <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();

            int iCount = bll.Count(entity, xdbHelper);

            theResult = iCount.ToString();

            if (bIsCreate)
                xdbHelper.EndDBHelper();

        }
        catch (Exception err)
        {
            if (bIsCreate)
                xdbHelper.TranDBHelper();

            throw err;
        }
        finally
        {
            if (bIsCreate)
                xdbHelper.FinallyDBHelper();
        }

        strResult = theResult;
    }