MySql 异常未处理 - 命令执行期间遇到 fatal error

Question

问题属于此按钮，我在这里收到错误:

objcommand.ExecuteNonQuery()

一旦我按下这个按钮，它应该更新我的 mysql 数据库中的所有记录。这是我的代码(确切的代码适用于另一个表):

Private Sub btnModify1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnModify1.Click
    Using objconnection = New MySqlConnection("Server=localhost;database=ba-solutions;user id=root;password=")
        objconnection.Open()
        If Len(cbxCompanyName.Text) < 1 Then
            MsgBox("Please select a company name")
            Return
        End If

        If Len(txtPosition.Text) < 1 Then
            MsgBox("Please enter the postion of the shareholder in the company")
            Return
        End If

        If Len(txtNI.Text) <> 8 Then
            MsgBox("The National Insurance Number must be 8 characters")
            Return
        End If

        If Len(txtAddressLine.Text) < 1 Then
            MsgBox("Enter a First Line of Address")
            Return
        End If

        If Len(txtCity.Text) < 1 Then
            MsgBox("Enter a City Name")
            Return
        End If

        If Len(txtPostcode.Text) < 1 Then
            MsgBox("Enter a Postcode")
            Return
        End If

        If Len(txtEmail.Text) < 1 Then
            MsgBox("Enter an Email Address")
            Return
        End If

        If Len(txtPhoneNumber.Text) <> 11 Then
            MsgBox("The Phone Number must be 11 numbers ")
            Return
        End If
        'all validations for relevant textboxes
        Dim companyname As String
        Dim position As String
        Dim ninumber As String
        Dim dob As String
        Dim forename As String
        Dim surname As String
        Dim addressline1 As String
        Dim city As String
        Dim postcode As String
        Dim phonenumber As String
        Dim email As String
        postcode = txtPostcode.Text
        companyname = cbxCompanyName.Text
        position = txtPosition.Text
        ninumber = txtNI.Text
        dob = DTP1.Value
        forename = txtForename.Text
        surname = txtSurname.Text
        addressline1 = txtAddressLine.Text
        city = txtCity.Text
        phonenumber = txtPhoneNumber.Text
        email = txtEmail.Text
        sqlstring = "UPDATE shareholder_details SET position=@position, ni=@ninumber, dob=@dob, forename=@forename, surname=@surname, addressline1=@addressline, city=@city, postcode=@postcode, phonenumber=@phone, email=@email where companyname=  @company "
        objcommand = New MySqlCommand(sqlstring, objconnection)
        objcommand.Parameters.AddWithValue("@company", companyname)
        objcommand.Parameters.AddWithValue("@postion", position)
        objcommand.Parameters.AddWithValue("@ni", ninumber)
        objcommand.Parameters.AddWithValue("@dob", dob)
        objcommand.Parameters.AddWithValue("@forename", forename)
        objcommand.Parameters.AddWithValue("@surname", surname)
        objcommand.Parameters.AddWithValue("@addressline", addressline1)
        objcommand.Parameters.AddWithValue("@city", city)
        objcommand.Parameters.AddWithValue("@postcode", postcode)
        objcommand.Parameters.AddWithValue("@phone", phonenumber)
        objcommand.Parameters.AddWithValue("@email", email)
        objcommand.ExecuteNonQuery()

        btnRefresh.PerformClick()

        Dim check As Integer = objcommand.ExecuteReader.RecordsAffected
        If check < 1 Then
            MessageBox.Show("Record was not updated, please try again", "Update unsucessfull",
    MessageBoxButtons.OK, MessageBoxIcon.Error)
        Else
            MessageBox.Show("Record updated sucessfully", "Update sucessfull",
    MessageBoxButtons.OK, MessageBoxIcon.Information)
            objconnection.Close()
        End If
    End Using
End Sub

Answer 1

你写

objcommand.Parameters.AddWithValue("@postion", position)

但这可能应该是

objcommand.Parameters.AddWithValue("@position", position)

其他问题可能是，
你有ni=@ninumber ，在您的 SQL 语句中，
但你使用 objcommand.Parameters.AddWithValue("@ni", ninumber)在你的主机变量中

在你的 SQL 语句中这看起来不同 companyname= @company与您使用其他主机变量相比

您可以尝试使用与 objcommand.Parameters.AddWithValue("@host_variable", variable) 相同的顺序吗？正如您在 SQL 语句中使用的那样