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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) ' 将 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$(stokens(0))) Then
cnn.Execute sql ( 5 ) . 执行 sql 语句( update , delete , insert )
msgstring = stokens(0) & "query sucessfully!" ‘执行成功!
Else
' 查询记录集,并且返回记录集
Set rst = New ADODB.Recordset
rst.CursorLocation = adUseClient ' 远程数据服务用法 当用于客户端 (ADOR) Recordset 或 Connection 对象时,只能将 CursorLocation 属性设置为 adUseClient 。
rst.Open Trim$(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