Question

大家好，我是这个网站的新手，我想得到你们的帮助。我目前正在处理我的项目，我使用的是VB.net 2010.我需要帮助我自动生成的ID。

我希望我的ID像这样： CAT001 CAT002 CAT003 等等。

Answer 1

假设你有一个名为_idNumber的id号的计数器，那么你可以有类似的东西：

Dim idString as String = String.Format("CAT{0}", _idNumber.ToString("D3"))

Answer 2

Private Sub autogenerate_ID()
    Dim mysqlconnection As MySqlConnection
    Dim command As New MySqlCommand

    MySqlConnection = New MySqlConnection()
    MySqlConnection.ConnectionString = " server = localhost; user id = root; password=; database = your database "
    Command.Connection = MySqlConnection
    mysqlconnection.Open()

    Dim sqlquery = "select Max(ID) from yourtable "
    command.CommandText = sqlquery
    Dim ID As Integer
    Dim value As String

    value = command.ExecuteScalar().ToString()

    If String.IsNullOrEmpty(value) Then
        value = "CAT000"
    End If

    value = value.Substring(3)
    Int32.TryParse(value, ID)
    ID = ID + 1
    value = "CAT" + ID.ToString("D3") 
    Txt.Text = value

    command.Dispose()
    mysqlconnection.Close()
    mysqlconnection.Dispose()

End Sub

在VB.Net中自动生成的字母数字ID

2 个答案: