Question

我在SQL Server中有一个float类型的列Probability，而我在C＃中有一些计算：

var _Total_Records = 0;
var _Matchings = 0;
var _Probability = 0.0;

_Matchings = Convert.ToInt32(_myCommand_2.ExecuteScalar());
_Probability = Convert.ToDouble(_Matchings.ToString()) / Convert.ToDouble(_Total_Records);

现在我想在_Probability方法中将此WriteToDatabase()值写入SQL Server表，即

public static void Write_To_Database(int _id, int _Matched, double _Prob)
{
     var _Result = 0;
     SqlConnection _con = _cs.GetConnection();
     try
     {
         string _myUpdate_Command_1 = @"UPDATE AuthorCoAuthorProbability 
                                        SET Matched_Records = @_Matched_Records
                                        Probability = @_Probability
                                        WHERE id = @_id";

         SqlCommand _myUpdate_Command = new SqlCommand(_myUpdate_Command_1, _con);
         _myUpdate_Command.Parameters.AddWithValue("@_id", _id);
         _myUpdate_Command.Parameters.AddWithValue("@_Matched_Records", _Matched);
         _myUpdate_Command.Parameters.AddWithValue("@_Probability", _Prob);

         _Result = _myUpdate_Command.ExecuteNonQuery();

         _cs.Dispose();
      }
      catch (Exception e)
      {
          Console.WriteLine(e.Message);
      }
}

在_Result =_myUpdate_Command.ExecuteNonQuery();命令：

我得到了例外，即

Incorrect syntax near `Probability`

有没有数据类型错误？由于SQL Server表中的列数据类型为float，并且我将double的值_Probability存储在其中，或者由于还有什么异常？

Answer 1

您的SQL语句中缺少逗号

替换

SET Matched_Records = @_Matched_Records Probability = @_Probability

与

SET Matched_Records = @_Matched_Records, Probability = @_Probability

在SQL Server中浮动为Double

1 个答案: