使用SqlDataAdapter不保存到数据库的更改

我遇到了未保存到SQL Server数据库的更改。使用SqlDataAdapter不保存到数据库的更改

我可以正确读取数据库，当调用RefreshGrid()刷新数据库时，gridview会正确更新。但是，当重新启动程序或检查实际数据库时，不会发生变化。

我通常会为此使用实体框架，但有时候需要学习其他方法。

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"]; 
    } 
}

来源

2014-11-25 mrapan

您只需执行查询：

rewardsAdapter.InsertCommand.ExecuteNonQuery();

来源

2014-11-25 12:39:26 apomene

感谢您的快速回答！正如我暗示的，被实体框架宠坏了，我在这里毫无头绪。但我确实相信这是从DataSet执行的。在RewardsDS中，我有以下生成的行： 'int returnValue = this.Adapter.InsertCommand.ExecuteNonQuery（）;' 我是否需要在另一个地方调用它？ – mrapan 2014-11-25 14:41:30

我会道歉浪费任何人的时间开始。最后发现是什么导致了这个错误，它比我想象的更基本，并且根本不是我一直在寻找解决方案的地方。我做了关于连接字符串一个尴尬的错误，但如果有人重复我的错误，这是它：

我一直在使用的连接字符串的数据集，而不是实际的数据库...

添加正确的连接字符串当然解决了我的问题，当然不可能让任何人只看到我上面发布的代码。

来源

2014-11-25 15:43:12 mrapan

使用SqlDataAdapter不保存到数据库的更改

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