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我正在尝试批量插入数据，数据库是 MySQL 连接是使用 Devart LinqConnect 完成的。这是一个代码：

DataContext db = new DataContext();
List<XYData> XYDList = new List<XYData>(); // Data Type
List<xydata> xyToBeInsrted = new List<xydata>(); // Database table

XYDList = XYData.genXYData(12, 1234); // Generates 12 example records 

foreach (XYData oneXY in XYDList)
{
    // Create clear row representation               
    xydata xy_row = new xydata();
    // Assign data from object
    xy_row.id = oneXY.Id;
    xy_row.Batchid = (int)oneXY.BatchId;
    xy_row.Ch = oneXY.Channel;
    xy_row.Value = oneXY.Value;
    xy_row.Pos = (int)oneXY.Position;
    xy_row.Dtm = oneXY.Time;

    // Add to list of rows to be inserted
    xyToBeInsrted.Add(xy_row);

}
db.xydatas.InsertAllOnSubmit<xydata>(xyToBeInsrted);
db.SubmitChanges();

最后一行给出错误“已添加具有相同键 '0' 的实体”。当我将要生成的项目数减少到 1 时，它就会起作用。任何高于 1 的值都会出错。

表已在记录 ID 字段上设置了自动增量。

试图解决这个问题 2 小时没有成功。

编辑：数据类：

 public class XYData
 {
   [Column(IsPrimaryKey = true, IsDbGenerated = true)]
   public int Id { get; set; }

   public int BatchId { get; set; }
   public int Channel { get; set; }
   public String Value { get; set; }
   public double Position { get; set; }
   public DateTime Time { get; set; }

   private static Random rand = new Random();

   public XYData(int channel = 0, string val = "")
   {
       Channel = channel;
       Value = val;
       Position = 0;
       Time = DateTime.Now;
   }

   public static List<XYData> genXYData(int howMany, int batchId)
   {
       List<XYData> _allXYData = new List<XYData>();
       for (int i = 0; i < howMany; i++)
       {
           XYData _singleXY = new XYData();
           _singleXY.BatchId = batchId;
           for (int j = 64 * (1 << i); j > 0; j--)
           {
               uint k = (uint)rand.Next(int.MaxValue);
               _singleXY.Value += k.ToString("X8");
           }
           _allXYData.Add(_singleXY); // Add to list
       }
       return _allXYData; // Return list of generated data.
   }
 }
4

1 回答 1

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您的模型定义可能需要这样的东西 -

[Column(IsPrimaryKey=true, IsDbGenerated=true)]
public int Id { get; set; }

http://www.devart.com/linqconnect/docs/PrimaryKeyMapping.html

于 2013-08-07T14:53:43.033 回答