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处理数据库函数

2010-08-25 20:52  myjava2  阅读(113)  评论(0编辑  收藏  举报

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处理数据库中数据常用的一个函数:

Public Function ExecuteSQL(ByVal sql As String, ByVal msgstring As String) As ADODB.Recordset 

Dim cnn As ADODB.Connection  1 . 定义一个连接

  Dim rst As ADODB.Recordset   2 . 定义一个记录集

 

  Dim stokens() As String

  Dim connectionstring As String  

  connectionstring = "filedsn=andy.dsn;UID=sa;pwd=123456"

 

On Error GoTo Executesql_error

 

    stokens() = Split(sql)         ' sql 中字符串中的每个单词,分别赋给一维数组的每个单位

   

    Set cnn = New ADODB.Connection   3 . 实例化连接

    cnn.Open connectionstring          4 . 打开连接,让程序连接到特定的数据库

   

    ' 如果有 insert delete update 语句可以直接执行 sql 语句而不用去查询, connection command recordset 都可以执行 sql 语句

    If InStr("INSERT,DELETE,UPDATE", UCase$(stokens(0))) Then

       cnn.Execute sql         5 . 执行 sql 语句( update delete insert

       msgstring = stokens(0) & "query sucessfully!" ‘执行成功!

      

    Else

       ' 查询记录集,并且返回记录集

       Set rst = New ADODB.Recordset

       rst.CursorLocation = adUseClient                ' 远程数据服务用法    当用于客户端 (ADOR) Recordset Connection 对象时,只能将 CursorLocation 属性设置为 adUseClient

      

       rst.Open Trim$(sql), cnn, adOpenKeyset, adLockOptimistic 6 .select 语句返回一个记录集 (rst) rst.open “select * from student _info”,cnn,adopenkeyset,adlockoptimistic

       ' 打开一个数据库元素,此元素可提供对表的记录、查询的结果或保存的 Recordset 的访问。

       Set ExecuteSQL = rst

       msgstring = " 查询到 " & rst.RecordCount & " 条记录 "

     End If

Executesql_exit:

 

       Set rst = Nothing

       Set cnn = Nothing

       Exit Function

Executesql_error:

       msgstring = " 查询错误: " & Err.decription

       Resume Executesql_exit