mysql - 如何从 Visual Basic 6 连接到 MySQL 数据库

Question

我正在使用 visual basic 6。我创建了一个按钮，按下该按钮时应显示表格的所有条目。我正在使用以下代码连接到 MySQL 数据库。我使用了 Microsoft Remote Data Services 作为我的引用

代码:

Private Sub cmdConnectMySQL_Click()
Dim cnMySql As New rdoConnection
Dim rdoQry  As New rdoQuery
Dim rdoRS   As rdoResultset

  cnMySql.CursorDriver = rdUseOdbc
  cnMySql.Connect = "uid=root;pwd=;
  server=localhost; driver={MySQL ODBC 3.51 Driver};
  database=demo;dsn=;"
  cnMySql.EstablishConnection
  With rdoQry
    .Name = "selectUsers"
    .SQL = "select * from user"
    .RowsetSize = 1
    Set .ActiveConnection = cnMySql
    Set rdoRS = .OpenResultset(rdOpenKeyset, rdConcurRowVer)
  End With

  Do Until rdoRS.EOF
    With rdoRS
      rdoRS.MoveNext
    End With
  Loop
  rdoRS.Close
  cnMySql.Close

End Sub 

我无法连接到数据库。如何连接？

Answer 1

您可以尝试使用 ADO 而不是 RDO 吗？

• 添加对 Microsoft ActiveX 数据对象 2.8 库的引用
• 设置一个ODBC DSN来连接数据库

然后使用类似这样的代码

Dim cnConnection As ADODB.Connection
Dim adorsRecordSet As ADODB.Recordset
Dim sDatabase As String
Dim sSQL As String

sDatabase = "NameOfTheMysqlDSN"
sSQL= "Select * From user"

Set cnConnection = New ADODB.Connection
cnConnection.Open sDatabase
Set adorsRecordSet = New ADODB.Recordset

adorsRecordSet.Open sSQL, cnConnection 

Do Until (adorsRecordSet.EOF)
     adorsRecordSet.MoveNext
Loop