移动应用程序，insert sql语句将插入多行！！！！ [英] Mobile App,the insert sql statement inserts more then one row!!!!

问题描述

大家好，

我正在开发一个移动应用程序，当按下回车键时，我必须从txtbox到数据库表中插入一些值.但是sql命令会插入多行，直到我向txt框添加新值为止.问题出在connection.Close();我应该在哪里关闭它，或者如果需要检查该怎么做?请帮忙！

提前谢谢.
这是部分代码:

hello all,

I am developing a mobile app and i have to insert some values from the txtbox to dhe database table when enter key is pressed.but the sql command inserts more then one row,until i add a new value to the txt box.i think the problem is at the connection.Close();where should i close it,or should i make any if checks??Please help!

Thanks in advance.
Here some part of code:

string _connString = String.Format(System.Globalization.CultureInfo.InvariantCulture,
           @"Data Source = {0}\SQL_CE.sdf", Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase));
           SqlCeConnection _connection = new SqlCeConnection(_connString);

           if (e.KeyChar == (char)13)
           {

               _connection.Open();

               SqlCeCommand desc_command = new SqlCeCommand("select description from Items where barcode=@barcode;", _connection);
               desc_command.Parameters.AddWithValue("@barcode", txt_barcode.Text);
               SqlCeDataReader rdr = desc_command.ExecuteReader();
               if (rdr.Read())
               {
                   txt_description.Text = rdr.GetString(0);
               }
               else
               {
                   txt_description.Text = "-----";
               }

               SqlCeCommand _addcommand = new SqlCeCommand("insert into Inventory values(@barcode,@amount);", _connection);
               _addcommand.Parameters.AddWithValue("@barcode", txt_barcode.Text);
               _addcommand.Parameters.AddWithValue("@amount", txt_amount.Text);
               _addcommand.ExecuteNonQuery();
               txt_barcode.Text = "";

               _connection.Close();
           };

推荐答案

我解决了，还是谢谢.我只是使用了while循环，而txtbox！="，打开了连接，插入了语句，然后关闭连接！！

I resolved it,Thanks anyway.I just used a while loop,while the txtbox != "" ,open the connection,the insert statement,then close the connection!!

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