Question

页: 1 它说,我必须宣布微量变量@PicID。我怎么能宣布可笑吗? 或者,我这样做是否不正确?

 public int GetTotalNoVotes(int PicRating, int PicID)
    {
        //get database connection string from config file 
        string strConectionString = ConfigurationManager.AppSettings["DataBaseConnection"];

        SqlConnection conn = new SqlConnection(strConectionString);
        conn.Open();

        SqlCommand oCommand = new SqlCommand("SELECT COUNT(1) AS Expr1 FROM Ratings WHERE PicRating = @PicRating) AND (PicID = @PicID)", conn);
        oCommand.Parameters.Add("@PictureID", SqlDbType.Int);
        oCommand.Parameters["@PictureID"].Value = PicID;

        oCommand.Parameters.Add("@PicRating", SqlDbType.Int);
        oCommand.Parameters["@PicRating"].Value = PicRating;

        object oValue = oCommand.ExecuteScalar();

        conn.Close();

        if (oValue == DBNull.Value)
        {
            return 0;
        }
        else
        {
            return Convert.ToInt32(oValue);
        }
    }

Answer 1

I think you ve defined the parameter @PictureId but you ve used the variable name @PicId in the query

Try:

SqlCommand oCommand = new SqlCommand("SELECT COUNT(1) AS Expr1 FROM Ratings WHERE PicRating = @PicRating) AND (PicID = @PictureID)", conn);

Answer 2

我怎么会宣布一个比额表。

页: 1

oCommand.Parameters.Add("@PictureID", SqlDbType.Int);
oCommand.Parameters["@PictureID"].Value = PicID;

在此情况下,你必须把影像转换为PicID。

oCommand.Parameters.Add("@PicID", SqlDbType.Int);
oCommand.Parameters["@PicID"].Value = PicID;

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