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Old August 18th, 2009, 05:03 PM
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Default Comments AddedByIP

Hi,

I have not been able to find this addressed anywhere so that is why I am posting a new thread.

In the database table this field is defined to be nchar(15). The parameter @AddedByIP in the tbh_Articles_InsertComment stored procedure is consequently also defined to be nchar(15). In the downloaded code this is the implementation of the InsertComment method in the SqlArticlesProvider class:

Code:
      public override int InsertComment(CommentDetails comment)
      {
         using (SqlConnection cn = new SqlConnection(this.ConnectionString))
         {
            SqlCommand cmd = new SqlCommand("tbh_Articles_InsertComment", cn);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.Add("@AddedDate", SqlDbType.DateTime).Value = comment.AddedDate;
            cmd.Parameters.Add("@AddedBy", SqlDbType.NVarChar).Value = comment.AddedBy;
            cmd.Parameters.Add("@AddedByEmail", SqlDbType.NVarChar).Value = comment.AddedByEmail;
            cmd.Parameters.Add("@AddedByIP", SqlDbType.NVarChar).Value = comment.AddedByIP;
            cmd.Parameters.Add("@ArticleID", SqlDbType.Int).Value = comment.ArticleID;
            cmd.Parameters.Add("@Body", SqlDbType.NVarChar).Value = comment.Body;
            cmd.Parameters.Add("@CommentID", SqlDbType.Int).Direction = ParameterDirection.Output;
            cn.Open();
            int ret = ExecuteNonQuery(cmd);
            return (int)cmd.Parameters["@CommentID"].Value;
         }
      }
Note how in the code the parameter @AddedByIP is defined to be nvarchar. I assume that the site is working fine like that, so I am assuming that there will be a conversion going on in SQL Server 2005. Wouldn't this conversion reduce performance?

Thanks for any clarification on this matter.
 
Old August 19th, 2009, 03:46 PM
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Default

Yes, this is probably an oversight by the author (wouldn't be the only one!).

There is an implicit conversion that takes place, but I doubt it affects performance much if at all. When populating an nchar, SQL Server merely pads the input string to take up a fixed length in storage, if the input string is shorter than the nchar limit (in this case, 15 characters).
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