--
--某table的column存在,傳回1;column不存在,傳回0 select count(name) from syscolumns where id=(select id from sysobjects where name='tableName')and name='columnName'
--某table的column存在,傳回1;column不存在,傳回0 select count(name) from syscolumns where id=(select id from sysobjects where name='tableName')and name='columnName'
SET ROWCOUNT 1 /*要先下此條件*/ GO UPDATE table_name set field_1 = GETDATE()WHERE field_2 = 'Y'
SELECT col2,col3,count(*) qty FROM table2 where col2 is nullgroup by col2,col3 having count(*) > 1
UPDATE TABLEA SET (b, c, d) = (SELECT b1, c1, d1 from TABLEB WHERE TABLEB.a1 = TABLEA.a and TABLEB.e1 > 40) WHERE EXISTS (SELECT 1 from TABLEB WHERE TABLEB.a1 = TABLEA.a and TABLEB.e1 > 40) update ( select a.fileld, b.fileld from TABLEA a, TABLE b where a.key = b.key) set fileld = fileld
select COLUMN2,COLUMN3 from TABLENAMEwhere len(COLUMN3) != datalength(convert(varchar(1000),COLUMN3))
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
'將所選取的反過來讀取
For i As Integer = DataGridView1.SelectedCells.Count - 1 To 0 Step -1
MsgBox(DataGridView1.SelectedCells(i).Value)
Next
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
For i As Integer = DataGridView1.SelectedRows.Count - 1 To 0 Step -1
MsgBox(DataGridView1.SelectedRows(i).Cells(0).Value)
Next
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Try
'建立暫存Table!!
Dim dt As New DataTable
dt.Columns.Add(New DataColumn("tItem", System.Type.GetType("System.String")))
dt.Columns.Add(New DataColumn("tDescription", System.Type.GetType("System.String")))
dt.Columns.Add(New DataColumn("tMemon", System.Type.GetType("System.String")))
'建立暫存資料!!
Dim dr As DataRow = dt.NewRow
dr.Item("tItem") = "1"
dr.Item("tDescription") = "你好嗎?"
dr.Item("tMemon") = "...."
dt.Rows.Add(dr)
'建立暫存資料!!
dr = dt.NewRow
dr.Item("tItem") = "2"
dr.Item("tDescription") = "你是誰?"
dr.Item("tMemon") = ",,,,,"
dt.Rows.Add(dr)
'呼叫匯出Excel Function
If Not ExportExcel(dt, "c:\temp\123.xls", "測試") Then
MessageBox.Show("匯出Excel 時發生錯誤!!")
Else
MessageBox.Show("匯出Excel 成功!!")
End If
Catch ex As Exception
'錯誤則秀出錯誤訊息!!
MessageBox.Show(ex.Message)
End Try
End Sub
'DT: Data Table
'FullFileName: 匯出Excel 的完整路徑 Ex: C:\123.xls
'TableName: 匯出Excel 的Sheet Name
Private Function ExportExcel(ByVal DT As DataTable, ByVal FullFileName As String, ByVal TableName As String) As Boolean
Dim connection As New Data.OleDb.OleDbConnection(String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=""Excel 8.0""", FullFileName))
Try
'建立Excel Connection
connection.Open()
'產生Table
Dim strCreate As String
For i As Int32 = 0 To DT.Columns.Count - 1
strCreate += String.Format(",{0} Text(255)", DT.Columns(i).ColumnName)
Next
strCreate = String.Format("Create Table [{0}] ({1})", TableName, strCreate.Substring(1))
Dim command As New Data.OleDb.OleDbCommand(strCreate, connection)
command.ExecuteNonQuery()
'讀取Excel Table (Sheet)
Dim queryString As String = String.Format("Select * From [{0}]", TableName)
'建立Excel 配接器
Dim adapter As New Data.OleDb.OleDbDataAdapter()
'宣告一個Dataset
Dim ds As New DataSet
adapter.SelectCommand = New Data.OleDb.OleDbCommand(queryString, connection)
Dim builder As Data.OleDb.OleDbCommandBuilder = New Data.OleDb.OleDbCommandBuilder(adapter)
'產生新增語法
adapter.Fill(ds, TableName)
For i As Int32 = 0 To DT.Rows.Count - 1
Dim dr As DataRow = ds.Tables(TableName).NewRow
For j As Int32 = 0 To DT.Columns.Count - 1
dr.Item(DT.Columns(j).ColumnName) = DT.Rows(i).Item(j)
Next
ds.Tables(TableName).Rows.Add(dr)
Next
builder.GetInsertCommand(True)
'執行新增語法
adapter.Update(ds, TableName)
Return True
Catch ex As Exception
'擲出錯誤!!
Throw ex
Finally
'關閉連線
connection.Close()
End Try
End Function
SELECT id_num, MAX(score_chinese) AS '國文成績', MAX(score_english) AS '英文成績', MAX(score_math) AS '數學成績' FROM( SELECT id_num, CASE WHEN subject='國文' THEN score END AS score_chinese, CASE WHEN subject='英文' THEN score END AS score_english, CASE WHEN subject='數學' THEN scree END AS score_math FROM score_table ) AS score_table_tmp GROUP BY id_num
Private Sub Command35_Click() Dim CMD As String, EJECT As String, OPENDRAW As String Dim Data As String 'OPENDRAW = Chr(27) + Chr(27) '<==RP-U420的開錢櫃命令不是這樣子的,請查RP-U420的命令手冊 Data = Chr(27) + "c0" + Chr(2) '<==只列印收執聯命令只要下一次即可,其後就保持在同一狀態 Data = Data & "日期:2008/12/11 機號:1" & Chr(13) & Chr(10) Data = Data & "----------------------" & Chr(13) & Chr(10) Data = Data & "筆記型電腦 1 12500" & Chr(13) & Chr(10) Data = Data & "液晶螢幕 1 12000" & Chr(13) & Chr(10) Data = Data & "----------------------" & Chr(13) & Chr(10) Data = Data & "合計: 24500" & Chr(13) & Chr(10) Data = Data & "收現:35000 找零:500 " & Chr(13) & Chr(10) '要保持9列空白以讓資料出至裁切之後 Data = Data & CHR(27) & "d" & CHR(9) '<==跳9列空白,只要一道指定即可(詳情請看RP-U420命令手冊) Data = Data & Chr(29) + Chr(86) + Chr(1) '切紙 Call Send2Driver(Data, "Epson LQ-300 ESC/P 2")End Sub
(第一頁) 台灣 page : 1/2 A B C D ------------------------ 1 Z X W 2 U V L (第二頁) 台灣 page : 2/2 A B C D ------------------------- 1 H I Y 2 E S N 3 Q E V 4 I O W (第三頁) 中國 page : 1/3 A B C D ------------------------ 1 G E W 2 B E S 3 I W M (第四頁) 中國 page : 2/3 A B C D ------------------------ 1 G E W 2 B E S 3 I W M (第五頁) 中國 page : 3/3 A B C D ------------------------ 1 C E W 2 H E S