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public void BindData()
{
DataGrid1.AllowCustomPaging = true;
string username = Username.Text;
//string dateStart = joindateStart.SelectedDate.ToString().IndexOf("1900") >= 0 ? "" : joindateStart.SelectedDate.ToString();
//string dateEnd = joindateEnd.SelectedDate.AddDays(1).ToString().IndexOf("1900") >= 0 ? "" : joindateEnd.SelectedDate.AddDays(1).ToString();
string dateStart = joindateStart.SelectedDate.ToString();
string dateEnd = joindateEnd.SelectedDate.AddDays(1).ToString().IndexOf("1900") >= 0 ? DateTime.Now.AddDays(1).ToString() : joindateEnd.SelectedDate.AddDays(1).ToString();
DataGrid1.VirtualItemCount = DbProvider.GetInstance().GetSpaceRecordCount(username, dateStart, dateEnd);
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SELECT DATEADD(mm,DATEDIFF(mm,0,getdate()),0)
select convert(datetime,convert(varchar(8),getdate(),
120)+'01',120)
 
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select dateadd(day,-1,convert(datetime,convert
(varchar(8),dateadd(month,1,getdate()),120)+'01',120))
SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(m,0,getdate())+1,0))
 
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SELECT dateadd(ms,-3,DATEADD(mm,DATEDIFF(mm,0,getdate()),0))
 
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select DATEADD(wk,DATEDIFF(wk,0, dateadd(dd,6-datepart(
day,getdate()),getdate())),0)
 
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SELECT DATEADD(yy,DATEDIFF(yy,0,getdate()),0)
 
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SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate())+1,0))
 
7. È¥ÄêµÄ×îºóÒ»Ìì
SELECT dateadd(ms,-3,DATEADD(yy,DATEDIFF(yy,0,getdate()),0))
 
8. ±¾¼¾¶ÈµÄµÚÒ»Ìì
SELECT DATEADD(qq,DATEDIFF(qq,0,getdate()),0)
 
9. ±¾ÖܵÄÐÇÆÚÒ»
SELECT DATEADD(wk,DATEDIFF(wk,0,getdate()),0)
 
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#Region " ÃüÃû¿Õ¼ä "
Imports System.Data
Imports System.Data.SqlClient
#End Region
Public Class DBCommon
Implements IDisposable
#Region " ³ÉÔ±±äÁ¿ "
Private conn As SqlConnection
Private cmd As SqlCommand
Private trans As SqlTransaction
#End Region
#Region " ¹¹Ô캯Êý "
Public Sub New()
Connection()
End Sub
#End Region
#Region " ¹ý³Ìº¯Êý "
Public Sub Dispose() Implements IDisposable.Dispose
Close()
End Sub
Public Sub Close()
If conn Is Nothing Then
Return
End If
conn.Close()
conn.Dispose()
conn = Nothing
End Sub
Public Sub ClearParameter()
cmd.Parameters.Clear()
End Sub
Public Sub AddParameter( _
ByVal ParameterName As String, _
ByVal SqlDbType As SqlDbType, _
ByVal Size As Integer, _
ByVal Value As Object)
cmd.Parameters.Add(ParameterName, SqlDbType, Size).Value = Value
End Sub
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SQL The Complete Reference

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