[计算机]VB代码连接SQL数据库

1、.VB代码 连接SQL数据库Private Sub Command1_Click() If Option1.Value = True Then Db.ConnectionString = " Provider=SQLOLEDB.1;Password=" & Text4.Text & "Persist Security Info=True;User ID=" & Text3.Text & "Initial Catalog=" & "KJ70" & "Data

2、Source=" & Text1.Text Else Db.ConnectionString = " Provider=SQLOLEDB.1;Password=" & Text4.Text & "Persist Security Info=True;User ID=" & Text3.Text & "Initial Catalog=" & "KJ70" & "Data Source=" & Text2.Text End I

3、f Db.Open If Db.State = adStateOpen Then If Option1.Value = True Then Connected_Zhuji = True '主机连接标志 Else Connected_Zhuji = False '主机连接标志 Form1.Combo_GasLoad_Place.Enabled = False Form1.Combo_GasLoad_Place_2.Enabled = False End If Command1.Enabled = False Command2.Enabled = True Option1.Enab

4、led = False Option2.Enabled = False Devece_Name '载入KJ70中的传感器模拟量类型名 If Connected_Zhuji Then Gas_Load_Place '载入瓦斯涌出量数据库中的瓦斯传感器位置 End If End IfEnd SubPrivate Sub Devece_Name() Dim i As Integer i = 0 Rs.Open "SELECT DISTINCT 设备名1 From 设备 WHERE (firstFrequencyUp <> 0)", Db, adOpen

5、ForwardOnly, adLockReadOnly Do While Not Rs.EOF Form1.Combo1.List(i) = Rs(0) i = i + 1 Rs.MoveNext Loop Rs.Close Set Rs = NothingEnd SubPrivate Sub Command2_Click() Db.Close If Db.State = adStateClosed Then Set Db = Nothing Command1.Enabled = True Command2.Enabled = False Option1.Enabled = True Opti

6、on2.Enabled = True Form1.Comd_quen.Enabled = False Form1.Command3.Enabled = False Form1.ComFrontDay.Enabled = False Form1.ComBehDay.Enabled = False Form1.Combo1.Clear Form1.Combo2.Clear Form1.Combo_GasLoad_Place.Enabled = False End IfEnd SubPrivate Sub Form_Load() If Db.State = adStateOpen Then Command1.Enabled = False Command2.Enabled = True Option1.Enabled = False Option2.Enabled = False Else Command1.E