Question

这是我的代码，我收到错误消息＆＃34;未知表＆＃39;用户＆＃39;在字段列表＆＃34; 我该如何解决这个问题？

Imports MySql.Data
Imports MySql.Data.MySqlClient

Public Class Form1
Dim mysqlconn As New MySqlConnection
Dim command As MySqlCommand
Dim query As String = ""
Dim reader As MySqlDataReader


Private Sub loginbutton_Click(sender As Object, e As EventArgs) Handles loginbutton.Click
    getdbdata()
End Sub

Private Sub getdbdata()

    Try
        mysqlconn = New MySqlConnection("server=localhost;username=root;database=bank")

        query = "select user.Username, user.Password, user.Email" & _
                "from user"

        command = New MySqlCommand(query, mysqlconn)

        mysqlconn.Open()

        reader = command.ExecuteReader

        While reader.Read
            txtusername.Text = txtusername.Text & reader.Item("Username") & vbCrLf
            txtpassword.Text = txtpassword.Text & reader.Item("Password") & vbCrLf
            txtemail.Text = txtemail.Text & reader.Item("Email")
        End While

        reader.Close()
        mysqlconn.Close()

    Catch ex As MySqlException
        MessageBox.Show(ex.Message)

    End Try

End Sub

Answer 1

“银行”数据库中的表是“用户”吗？如果是这样，试试这个：

query = "select Username, Password, Email " & _
"from [user]"

未知表＆＃39;用户＆＃39;在字段列表中

1 个答案: