Question

Dim cn As OleDbConnection、OleDbDataAdapter 是什么意思？vb.net和access数据库连接

Imports System.Data.OleDb

Public Class Form1
Dim cn As OleDbConnection
Dim da As OleDbDataAdapter
Dim ds As DataSet

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim cnStr As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\persons.mdb;Persist Security Info=False"
cn = New OleDbConnection(cnStr)
Dim sql As String = "select * from grade"
da = New OleDbDataAdapter(sql, cn)
ds = New DataSet
da.Fill(ds, "grade")
DataGridView1.DataSource = ds.Tables(0)
End Sub
End Class

有没有大神能帮我解释一下每一句话，刚入门，真的看不太懂！

Answer 1

用ado.net查询access数据库的grade表，并把数据填充到表格DataGridView1

追问

谢谢，不过这个我都知道，就是里面的一些语句不理解，比如为什么要
Dim cn As OleDbConnection
Dim da As OleDbDataAdapter

oledbconnection和oledbdataadapter是表示什么。。

追答

这些知识不是凭空来的，是从微软官方文档msdn来的，或者书上网上学啊