从VB.NET将数据插入MySQL数据库

Question

I used the following code to insert data from my VB.NET into the MySQL database.

Dim connString As String = "Database=user;Data Source=localhost;" _
                 & "User Id=root;Password="
 Dim conn As New MySqlConnection(connString)
 Dim cmd As New MySqlCommand()
 Try
    conn.Open()
    cmd.Connection = conn
    getFormData()
    cmd.CommandText = "insert into privileges values (" & userId & "," & uname & "," & usb & "," & internet & "," & pro1 & "," & pro2 & "," & pro3 & "," & pro4 & "," & pro5 & ");"
    cmd.Parameters.AddWithValue("userId", userId)
    cmd.Parameters.AddWithValue("uname", uname)
    cmd.Parameters.AddWithValue("usb", cbusb.CheckState) 'Status", Convert.ToInt32(usb))
    cmd.Parameters.AddWithValue("internet", cbnet.CheckState) ' Convert.ToInt32(internet))
    cmd.Parameters.AddWithValue("pro1", txtpro1.Text)
    cmd.Parameters.AddWithValue("pro2", txtpro2.Text)
    cmd.Parameters.AddWithValue("pro3", txtpro3.Text)
    cmd.Parameters.AddWithValue("pro4", txtpro4.Text)
    cmd.Parameters.AddWithValue("pro5", txtpro5.Text)
   cmd.ExecuteNonQuery()
   MessageBox.Show("User Profile Created!", "Success!", MessageBoxButtons.OK, MessageBoxIcon.Asterisk)
    conn.Close()

However I get the following error message

Unknown column 'B5' in 'field list'

B5 is what I entered into the text box, but I do not know what field list refers to

I thin, its a problem with the Parameters statement

v

Answer 1

cmd.CommandText = "insert into privileges values (@userId,@uname....,@pro5)";

参数以@s标记

Answer 2

Thats a decent way of doing it; however, I have this way that works as well:

Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
Dim conn As MySqlConnection

'Connect to the database using these credentials
conn = New MySqlConnection
conn.ConnectionString = "server=your server site (generally long url); user id=login id for mysql user; password=self explanatory; database=name of the DB you're trying to reach"

'Try and connect (conn.open)
Try
    conn.Open()

Catch myerror As MySqlException 'If it fails do this... (i.e. no internet connection, etc.)
    MsgBox("Error connecting to database. Check your internet connection.", MsgBoxStyle.Critical)
End Try


'MySQL query (where to call for information)
Dim myAdapter As New MySqlDataAdapter

'Tell where to find the file with the emails/passes stored
Dim sqlquery = "SELECT * FROM the database you selected above WHERE Email = '" & txtEmail.Text & "' AND Password = '" & txtPassword.Text & "'"
Dim myCommand As New MySqlCommand
myCommand.Connection = conn
myCommand.CommandText = sqlquery

'Start query
myAdapter.SelectCommand = myCommand
Dim myData As MySqlDataReader
myData = myCommand.ExecuteReader

If myData.HasRows = 0 Then
    MsgBox("Invalid email address or password.", MsgBoxStyle.Critical)

Else
    MsgBox("Logged in as " & txtEmail.Text & ".", MsgBoxStyle.Information)

    Me.Close()

End If

End Sub

Try that and write back how it worked. Its a bit more functional because it lays out each step clearer.