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設(shè)置對VB數(shù)據(jù)庫連接的動態(tài)路徑

2004-02-11 eNet&Ciweek

  筆者的解決方法是利用app.path 來解決這個問題。

  一、用data控件進行數(shù)據(jù)庫鏈接,可以這樣:

  在form_load()過程中放入:

  private form_load()

  Dim str As String '定義

  str = App.Path

  If Right(str, 1) <> "" Then

  str = str + ""

  End If

  data1.databasename=str & "數(shù)據(jù)庫名"

  data1.recordsource="數(shù)據(jù)表名"

  data1.refresh

  sub end

  這幾句話的意為,打開當前程序運行的目錄下的數(shù)據(jù)庫。

  你只要保證你的數(shù)據(jù)庫在你程序所在的目錄之下就行了。

  

  二、利用adodc(ADO Data Control)進行數(shù)據(jù)庫鏈接:

  private form_load ()

  Dim str As String '定義

  str = App.Path

  If Right(str, 1) <> "" Then

  str = str + ""

  End If

  str = "Provider=Microsoft.Jet.OLEDB.3.51;Persist Security Info=False;Data Source=" & str & " sl.mdb"

  Adodc1.ConnectionString = str

  Adodc1.CommandType = adCmdText

  Adodc1.RecordSource = "select * from table3"

  Adodc1.Refresh

  end sub

  

  三、利用DataEnvironment進行數(shù)據(jù)庫鏈接

  可在過程中放入:

  On Error Resume Next

  If DataEnvironment1.rsCommand1.State <> adStateClosed Then

  DataEnvironment1.rsCommand1.Close '如果打開,則關(guān)閉

  End If

  'i = InputBox("請輸入友人編號:", "輸入")

  'If i = "" Then Exit Sub

  DataEnvironment1.Connection1.Open App.Path & "userdatabase sl.mdb"

  DataEnvironment1.rsCommand1.Open "select * from table3 where 編號='" & i & "'"

  'Set DataReport2.DataSource = DataEnvironment1

  'DataReport2.DataMember = "command1"

  'DataReport2.show

  end sub

  

  四、利用ADO(ActiveX Data Objects)進行編程:

  建立連接:

  dim conn as new adodb.connection

  dim rs as new adodb.recordset

  dim str

  str = App.Path

  If Right(str, 1) <> "" Then

  str = str + ""

  End If

  str = "Provider=Microsoft.Jet.OLEDB.3.51;Persist Security Info=False;Data Source=" & str & " sl.mdb"

  conn.open str

  rs.cursorlocation=aduseclient

  rs.open "數(shù)據(jù)表名",conn,adopenkeyset.adlockpessimistic

  用完之后關(guān)閉數(shù)據(jù)庫:

  conn.close

  set conn=nothing

  (完)

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