Question

问题：我想从我制作的程序（新的）编辑MySQL数据库表中的变量（数字）。什么可以让我接收当前变量然后在线编辑数据库。

代码使用：

Imports System.Data.SqlClient
Imports mysql

Public Class Form1
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Try
            Dim MySQLConnection = New SqlClient.SqlConnection
            MySQLConnection.ConnectionString = "server=db4free.net ;port=3306; user id=user; password=password; database=databasetest;"
            MySQLConnection.Open()
            MsgBox("Success!")
        Catch ex As Exception
            MsgBox("Failed!")
        End Try
    End Sub
End Class

编程语言：Visual Studios 13

Answer 1

看起来你是用VB编写的。要与数据库交互，您需要发送SQL命令。为了向它发送SQL命令，您需要SqlClient.SqlCommand。打开与数据库的连接后，您的代码将类似于以下内容，以更新特定表上特定字段的值：

Dim cmd As New SqlClient.SqlCommand
cmd.Connection = MySQLConnection
cmd.CommandText = "UPDATE <your table> SET <your field> = <your number> WHERE <however you would specify the record that needs to be changed>;"
Try
    cmd.ExecuteNonQuery()
Catch ex As SqlClient.SqlException
    'Deal with whatever error pops up
End Try

编辑在线数据库（在数据库表上编辑变量）

1 个答案: