在运行时以编程方式创建 sql server 数据库

Question

我正在创建一个使用 sql server 2008 数据库的 vb .net winform 项目。我的项目或多或少已经完成，但我想稍微调整一下。其中一项调整如下。我已经在 sql server 2008 中创建了数据库，但我想知道如何在 vb .net 项目中以编程方式创建数据库。我已经在互联网上搜索过这个问题，但对我来说没有什么足够清楚。我是在打开的表单中创建数据库还是在单独的类中创建它并在我使用数据库的其他表单中调用它？对此事的任何帮助将不胜感激。

Answer 1

以下代码将帮助您创建一个名为 my_db 的数据库和一个名为 customer 的数据库中的表。

注意：评论中给出了必要的解释，请阅读以澄清

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        //creating and initializing the connection string
        Dim myConnectionString As SqlConnection = New SqlConnection("Data Source=(local)\SQLEXPRESS;Initial Catalog=master;Integrated Security=True;Pooling=False")
        //since we need to create a new database set the Initial Catalog as Master
        //Which means we are creating database under master DB
        Dim myCommand As String //to store the sql command to be executed
        myCommand = "CREATE database my_db" //the command that creates new database
        Dim cmd As SqlCommand = New SqlCommand(myCommand, myConnectionString) // creating command for execution
        Try
            cmd.Connection.Open() //open a connection with cmd
            cmd.ExecuteNonQuery() //Execute the query
            cmd.Connection.Close() //Close the connection
        Catch
            MsgBox(" Already installed database", MsgBoxStyle.Critical, " MaS InfoTech- Warning")
        End Try
        //Creating table to the dynamicaly created database
        Try
            Dim cn As SqlConnection = New SqlConnection("Data Source=(local)\SQLEXPRESS;Initial Catalog=my_db;Integrated Security=True;Pooling=False")
          //here the connection string is initialized with Initial Catalog as my_db
            Dim sql As String //sql query string
            sql = "CREATE TABLE customer(cus_name varchar(50) NULL,address varchar(50) NULL,mobno numeric(18, 0) NULL,tin varchar(50) NULL,kg varchar(50) NULL)"
            cmd = New SqlCommand(sql, cn) // create command with connection and query string 
            cmd.Connection.Open()
            cmd.ExecuteNonQuery()
            cmd.Connection.Close()
          Catch
           MsgBox(" Already installed database", MsgBoxStyle.Critical, " MaS InfoTech- Warning")
          End Try
    End Sub