MySql 异常未处理 - 命令执行期间遇到致命错误

问题描述

问题属于这个按钮，我在这里得到错误:

the problem falls under this button and i get the error here:

objcommand.ExecuteNonQuery()

一旦我按下这个按钮，它就会更新我的 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):

Once i press this button, it should update all the records in my mysql database. Here is my code (the exact code works fine for another table):

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

推荐答案

你写的

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

但这应该是

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

其他问题可能是，
您的 SQL 语句中有 ni=@ninumber，
但是您在宿主变量中使用 objcommand.Parameters.AddWithValue("@ni", ninumber)

并且在您的 SQL 语句中，这看起来与您对其他主机变量的使用不同companyname= @company

and in your SQL statement this looks different companyname= @company compared to your usage of other host variables

您是否可以尝试使用与您在 SQL 语句中使用的 objcommand.Parameters.AddWithValue("@host_variable", variable) 相同的顺序

and could you try to use the same order of objcommand.Parameters.AddWithValue("@host_variable", variable) as you use in your SQL statement

这篇关于MySql 异常未处理 - 命令执行期间遇到致命错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！