C# Update Table using SqlCommand.Parameters

问题

I'm trying to update an MSSQL table using SqlCommand, I think it's a syntax error with my T-SQL, but here is what I have so far:

SqlCommand sqlCmd = new SqlCommand("UPDATE yak_tickets SET email = @emailParam, subject = @subjectParam, text = @textParam, statusid = @statusIDParam, ticketClass = @ticketClassParam WHERE id = @ticketIDParam", sqlConn);

The parameters are working as they should, however, the table never gets updated when I run the code. Any help would be appreciated =)

Here is the rest of the code:

    #region Parameters
    /* Parameters */
    sqlCmd.Parameters.Add("@ticketIDParam", SqlDbType.BigInt);
    sqlCmd.Parameters["@ticketIDParam"].Value = ticketID;

    sqlCmd.Parameters.Add("@emailParam", SqlDbType.NVarChar);
    sqlCmd.Parameters["@emailParam"].Value = ticketToBeSubmitted.getEmail();

    sqlCmd.Parameters.Add("@subjectParam", SqlDbType.NVarChar);
    sqlCmd.Parameters["@subjectParam"].Value = ticketToBeSubmitted.getSubject();

    sqlCmd.Parameters.Add("@textParam", SqlDbType.Text);
    sqlCmd.Parameters["@textParam"].Value = ticketToBeSubmitted.getTicketContent();

    sqlCmd.Parameters.Add("@statusIDParam", SqlDbType.NVarChar);
    sqlCmd.Parameters["@statusIDParam"].Value = ticketToBeSubmitted.getStatus();

    sqlCmd.Parameters.Add("@ticketClassParam", SqlDbType.NVarChar);
    sqlCmd.Parameters["@ticketClassParam"].Value = ticketToBeSubmitted.getTicketClass();
    #endregion

    #region Try/Catch/Finally
    /* Try/Catch/Finally */

    try
    {
        sqlConn.Open();
        sqlCmd.ExecuteNonQuery();
    }
    catch (SqlException sqlEx)
    {
        sqlErrorLabel.Text = sqlEx.ToString();
        sqlErrorLabel.ForeColor = System.Drawing.Color.Red;
    }
    finally
    {
        sqlConn.Close();
    }

And the method's signature:

  public static void updateTicketInDatabase(Ticket ticketToBeSubmitted, Label sqlErrorLabel, int ticketID)

回答1:

UPDATE FROM is invalid syntax (edit: OP corrected this). The problem might also be the "text" column. text is a keyword in SQL Server, since it's a datatype. Try putting brackets around it.

UPDATE yak_tickets 
SET email = @emailParam, 
    subject = @subjectParam, 
    [text] = @textParam, 
    statusid = @statusIDParam, 
    ticketClass = @ticketClassParam 
WHERE id = @ticketIDParam

回答2:

Had to use if(!Page.IsPostBack)

回答3:

Couple of questions:

Is this inside of a transaction thats getting rolledback?
Have you verified that you @ticketIDParam matches a set of rows on the table? Especially if its not just a integer key
Are you updating rows that have no side effects (i.e. your updating to the same values)?
Can you provide the paramaters.Add statements for this query
Is there a trigger or other setting on the table (I assume not, as you did not mention anything).
You said you know the params are working correctly, can you say how you verified this? (profiler, visual inspection, etc).

回答4:

Sounds like your hosting provider limits your debug options, forcing you to do it the old fashioned way. What if immediately after the update, you put something like:

;SELECT @@ROWCOUNT

then instead of ExecuteNonQuery, do ExecuteScalar, and see if SQL even thinks its updated anything.

来源：https://stackoverflow.com/questions/1934343/c-sharp-update-table-using-sqlcommand-parameters

标签

sql

sqlcommand

sqlclient