VB插入MySql

Question

作爲Vb noob即時通訊工作在這個學校項目。我需要插入我的值到我的MySQL數據庫，但由於它沒有插入嘗試的一切，但我找不到爲什麼它不插入。 THX提前

Dim sqlCommand As New MySqlCommand 
    Dim SQLConnection As MySqlConnection = New MySqlConnection 
    Dim strStockSQL As String 
    Dim server As String = "localhost" 
    Dim DatabaseName As String = "Gip" 
    Dim userName As String = "root" 
    Dim password As String = "" 
    SQLConnection = New MySqlConnection() 
    If Not conn Is Nothing Then conn.Close() 
    conn.ConnectionString = String.Format("server={0}; user id={1}; password={2}; database={3}; pooling=false", server, userName, password, DatabaseName) 
    Try 

     strStockSQL = "insert into stock (Barcode,Naam_Product,Verkoopprijs) values (@Barcode,@Naam_product,@Verkoopprijs)" 
     sqlCommand.Connection = SQLConnection 
     sqlCommand.CommandText = strStockSQL 
     sqlCommand.Parameters.AddWithValue("@Barcode", Convert.ToString(txtBarcode.Text)) 
     sqlCommand.Parameters.AddWithValue("@Naam_product", Convert.ToString(txtNaam.Text)) 
     sqlCommand.Parameters.AddWithValue("@Verkoopprijs", Convert.ToInt32(txtVP.Text)) 
     sqlCommand.ExecuteNonQuery() 

    Catch ex As Exception 
     MsgBox("Error occured: Could not insert record") 

Answer 1

當執行一個SqlCommand的，你必須有它的相關連接對象處於打開狀態。

SQLConnection.Open() 
sqlCommand.ExecuteNonQuery() 
SQLConnection.Close() 

此外，閱讀有關Using語句，並用它來SqlConnection。

另一件事：此代碼行是毫無意義的：If Not conn Is Nothing Then conn.Close()刪除它。