c# - 使用 c# 在 Ms Access 2007 中插入时出错

Question

我正在尝试插入数据库 Ms Access 2007 。首先，我从文件夹中获取所有文件名，然后将该文件名复制到数据库中。这是我的数据库截图。

这是我的代码

       string some = "Nothing";
        Response.Write(v);
        string[] filePaths = Directory.GetFiles(Server.MapPath("~/Gallery/GalleryImage/" + v));
        int a =0;
        OleDbCommand cmd = new OleDbCommand();
        OleDbConnection mycon = new OleDbConnection();
        mycon.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\AGENTJ.AGENTJ-PC\Documents\Visual Studio 2010\WebSites\mfaridalam\App_Data\mfaridalam1.accdb";

        cmd = mycon.CreateCommand();
        mycon.Open();
        foreach (string item in filePaths)
        {
            a++;
            string filename = Path.GetFileName(item);
            string ips = 00 + a.ToString();



          cmd.CommandText = "INSERT INTO [Image] ([Image],[Sort],[Created],[Albumid],[Description],[title])VALUES(" + filename + "," + ips + "," + some + "," +
           v + "," + some + "," + some + ");";


          int temp = cmd.ExecuteNonQuery();
          if (temp > 0)
          {
              Response.Write("Writing is complete, Success!");

          }
          else
          {
              Response.Write("Application Error, Try Again!");
          }


          Response.Write(filename+ "<br/>");

                  }
        mycon.Close();
        cmd.Dispose();
        mycon.Dispose();

我收到此错误

       No value given for one or more required parameters.

在第 42 行： int temp = cmd.ExecuteNonQuery();

Answer 1

如果您使用了参数化查询，则永远不会看到此错误。问题在于您的字符串连接中缺少为表中存在的每个文本/备忘录字段中的值传递的字符串的引号。

参数化查询可能需要更多输入，但更具可读性，并且将避免在解析字符串、日期、小数等值时出错......（以及称为 Sql Injection 的大问题）

cmd.CommandText = "INSERT INTO [Image] ([Image],[Sort],[Created],[Albumid]," + 
                  "[Description],[title])VALUES(?,?,?,?,?,?)";

cmd.Parameters.AddWithValue("@p1",filename);
cmd.Parameters.AddWithValue("@p2",ips);
cmd.Parameters.AddWithValue("@p3",some);
cmd.Parameters.AddWithValue("@p4",v);
cmd.Parameters.AddWithValue("@p5",some);
cmd.Parameters.AddWithValue("@p6",some);
int temp = cmd.ExecuteNonQuery();