使用SqlDataAdapter不保存到數據庫的更改

我遇到了未保存到SQL Server數據庫的更改。使用SqlDataAdapter不保存到數據庫的更改

我可以正確讀取數據庫，當調用RefreshGrid()刷新數據庫時，gridview會正確更新。但是，當重新啓動程序或檢查實際數據庫時，不會發生變化。

我通常會爲此使用實體框架，但有時候需要學習其他方法。

private string conString = ConfigurationManager.ConnectionStrings["RewardsConnectionString"].ConnectionString; 
private RewardsDS rewardsDset = new RewardsDS(); 

private SqlDataAdapter CreateDataAdapter(SqlConnection conn) 
{ 
    // Build the selection query. 
    SqlDataAdapter rewardsAdapter = new SqlDataAdapter(); 
    SqlCommand selectCommand = new SqlCommand("SELECT * FROM Purchases", conn); 
    rewardsAdapter.SelectCommand = selectCommand; 

    // Build the insertion query 
    SqlCommand insertCommand = new SqlCommand(
     @"INSERT INTO Purchases (PurchaseDate, Amount, CustomerId) 
     VALUES (@PurchaseDate, @Amount, @CustomerId)", conn); 

    insertCommand.Parameters.Add("@PurchaseDate", SqlDbType.DateTime, 0, "PurchaseDate"); // Not sure about this zero ... 
    insertCommand.Parameters.Add("@Amount", SqlDbType.Decimal, 0, "Amount"); 
    insertCommand.Parameters.Add("@CustomerId", SqlDbType.Int, 0, "CustomerId"); 

    rewardsAdapter.InsertCommand = insertCommand; 

    // Build the update query 
    SqlCommand updateCommand = new SqlCommand(
     @"UPDATE Purchases SET Amount = @Amount, PurchaseDate = @PurchaseDate WHERE PurchaseId = @PurchaseId", conn); 
    updateCommand.Parameters.Add("@Amount", SqlDbType.Decimal, 0, "Amount"); 
    updateCommand.Parameters.Add("@PurchaseDate", SqlDbType.DateTime, 0, "PurchaseDate"); 

    SqlParameter param = updateCommand.Parameters.Add("@PurchaseId", SqlDbType.Int, 0, "PurchaseId"); 
    param.SourceVersion = DataRowVersion.Original; 
    rewardsAdapter.UpdateCommand = updateCommand; 

    // Build the delete query 
    SqlCommand deleteCommand = new SqlCommand(
     "DELETE FROM Purchases WHERE PurchaseId = @PurchaseId", conn); 
    param = deleteCommand.Parameters.Add("@Id", SqlDbType.Int, 0, "PurchaseId"); 
    param.SourceVersion = DataRowVersion.Original; 
    rewardsAdapter.DeleteCommand = deleteCommand; 

    return rewardsAdapter; 
} 

// Gets changes and saves them to the database. 
private void SaveChanges() 
{ 
    using (SqlConnection conn = new SqlConnection(conString)) 
    { 
     var fadapter = CreateDataAdapter(conn); 
     conn.Open(); 
     DataSet changes = rewardsDset.GetChanges(); 

     try 
     { 
      fadapter.Update(changes, "Purchases"); 
     } 
     catch (Exception ex) 
     { 
      MessageBox.Show("There are no updates to be saved"); 
     } 

     conn.Close(); 
     rewardsDset.AcceptChanges(); 
    } 
} 

// Refresh the dataGridView from the database 
private void RefreshGrid() 
{ 
    rewardsDset.Clear(); 

    using (SqlConnection conn = new SqlConnection(conString)) 
    { 
     conn.Open(); 
     SqlDataAdapter myAdapter = new SqlDataAdapter("SELECT * FROM Purchases", conn); 
     myAdapter.Fill(rewardsDset, "Purchases"); 
     conn.Close(); 

     dataGridView1.DataSource = null; 
     this.dataGridView1.DataSource = rewardsDset.Tables["Purchases"]; 
    } 
}

來源

2014-11-25 mrapan

您只需執行查詢：

rewardsAdapter.InsertCommand.ExecuteNonQuery();

來源

2014-11-25 12:39:26 apomene

感謝您的快速回答！正如我暗示的，被實體框架寵壞了，我在這裏毫無頭緒。但我確實相信這是從DataSet執行的。在RewardsDS中，我有以下生成的行： 'int returnValue = this.Adapter.InsertCommand.ExecuteNonQuery（）;' 我是否需要在另一個地方調用它？ – mrapan 2014-11-25 14:41:30

我會道歉浪費任何人的時間開始。最後發現是什麼導致了這個錯誤，它比我想象的更基本，並且根本不是我一直在尋找解決方案的地方。我做了關於連接字符串一個尷尬的錯誤，但如果有人重複我的錯誤，這是它：

我一直在使用的連接字符串的數據集，而不是實際的數據庫...

添加正確的連接字符串當然解決了我的問題，當然不可能讓任何人只看到我上面發佈的代碼。

來源

2014-11-25 15:43:12 mrapan

使用SqlDataAdapter不保存到數據庫的更改

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