无法用数据填充OleDbDataAdapter

Question

我无法在OleDbDataAdapter中填写数据

我得到一个带有以下消息的OleDbException ( Syntax error in FROM clause. )

在这一行adapter.Fill(dataset, "User")

这是代码

Imports System.Data.OleDb

Public Class Form1

Public connection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\MyDatabase.mdb;Persist Security Info=False")

Private Sub button_display_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button_display.Click
    connection.Close()
    connection.Open()
    Dim adapter As New OleDbDataAdapter
    adapter.SelectCommand = New OleDbCommand
    adapter.SelectCommand.Connection = connection
    adapter.SelectCommand.CommandText = "select * from user;"

    Dim dataset As New DataSet
    adapter.Fill(dataset, "User")
    connection.Close()
    Dim datarow = dataset.Tables("User").Rows(0)
    Dim fname, lname As String
    fname = datarow(0)
    lname = datarow(1)
    txtfirstname.Text = fname
    txtlastname.Text = lname

End Sub
End Class

我试过替换

    Dim adapter As New OleDbDataAdapter
    adapter.SelectCommand = New OleDbCommand
    adapter.SelectCommand.Connection = connection
    adapter.SelectCommand.CommandText = "select * from user;"

    Dim dataset As New DataSet
    adapter.Fill(dataset, "User")

使用

    Dim adapter As New OleDbDataAdapter("select * from user;", connection)
    Dim dataset As New DataSet
    adapter.Fill(dataset, "User")

我也试过

    Dim adapter As New OleDbDataAdapter
    adapter.SelectCommand = New OleDbCommand("select * from user;", connection)
    Dim dataset As New DataSet
    adapter.Fill(dataset)

但我得到了同样的例外Syntax error in FROM clause

Answer 1

用户是一个保留字。它应该是这样写的：

"select * from [user];"

注意方括号。最好通过重命名表来完全避免保留词。

Answer 2

我不确定adapter.SelectCommand = New OleDbCommand是正确的(我不做太多的VB，所以我可能错了)，在任何情况下，您为什么要关闭连接，然后打开它，然后不关闭它？把你的距离移到尽头。

试着做这样的事情：

Dim conn As New OleDbConnection(connection)
Dim adapter As New OleDbDataAdapter()
conn.Open()
adapter.SelectCommand = new OleDbCommand("Select * From User", conn)
DataSet dataset As New DataSet
adapter.Fill(dataset)
conn.Close()

剩下的代码