all tech stuff

resharper and auto-property gotcha

Alex Bransky — Thu, 07 Aug 2008 23:10:29 GMT

Be very careful when allowing Resharper to convert properties to auto-properties. In some cases it will re-initialize fields that were already initialized earlier on in the constructor.

http://www.jetbrains.net/jira/browse/RSRP-75137;jsessionid=D915EE10CA08D52D70BCAD44AE37447B?page=com.atlassian.jira.plugin.system.issuetabpanels:changehistory-tabpanel

generic typing and scope_identity()

Alex Bransky — Wed, 06 Aug 2008 17:38:38 GMT

I recently ran into an interesting problem. I had created a data access method that used generic typing to execute a scalar SQL Server stored procedure (below), and in the stored procedure was returning SCOPE_IDENTITY() for an integer identity column. I was passing in a type of "int" to the method (as <T>) since that's what I was expecting back, but I kept getting back null. After some frustration and bewilderment I discovered that SCOPE_IDENTITY() always returns a decimal, and C# doesn't want to convert the decimal to an integer automatically. I worked around it by using CAST in the stored procedure so that I didn't have to modify the method.

        private static T? ExecuteScalarStoredProcedure  (string sprocName, SqlParameter[] parameters) where T : struct {

            SqlConnection conn = new SqlConnection(GetConnectionString());

            conn.Open();
            object retValue;
            try {
                SqlCommand command = new SqlCommand(sprocName, conn);
                command.CommandType = CommandType.StoredProcedure;
                command.Parameters.AddRange(parameters);

                retValue = command.ExecuteScalar();
            }
            finally {

                try {

                    conn.Close();

                }
                catch (Exception) {
                    //Ignore close exception
                }
            }
            return retValue as T?;
        }

best quote ever

Alex Bransky — Fri, 27 Jun 2008 23:07:58 GMT

"So they told me that using the download page to download something was not something they anticipated."

--Bill Gates

activerecord and executereader exceptions

Alex Bransky — Wed, 28 May 2008 20:46:45 GMT

About once a day I was getting the following error from an ASP.Net web page that uses ActiveRecord:

Exception Details: System.Data.SqlClient.SqlException: A transport-level error has occurred when sending the request to the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.)

I would subsequently get this error upon refreshing the page:

Exception Details: System.InvalidOperationException: ExecuteReader requires an open and available Connection. The connection's current state is closed.

I finally figured out that the problem occurs when the database is restored. The connections in the IIS application pool do not get destroyed when the database is restored, so when ActiveRecord (nHibernate) tries to reuse the connections it fails. This doesn't happen to me when I'm not using ActiveRecord, so I'm not sure if this is a bug with ActiveRecord or a problem with the way I've set up the data access layer.

ssas: define reference and materialize

Alex Bransky — Thu, 10 Apr 2008 22:25:34 GMT

Apparently you have to watch out when you select Materialize in a referenced dimension in SSAS 2005. I just ran into a situation where data was getting duplicated for no good reason, and unchecking Materialize fixed it.

http://www.biblogs.com/2006/12/23/materialize-option-in-a-reference-dimension/

granularity error in SSAS MDX drillthrough query

Alex Bransky — Wed, 09 Apr 2008 22:44:14 GMT

I was trying to create an MDX drillthrough this morning in my SSAS 2005 cube, and I got this error:

Errors from the SQL query module: The attribute 'Applicant Name' in the dimension 'Dim Candidate' is outside the granularity of the measure group 'Fact Requisitions' and cannot be returned as a column.

I only got one result from Google for that error message and it wasn't helpful at all. After trying a million different things with partitions and actions and whatnot, I finally figured out the problem: I was trying to return drillthrough data from a fact table other than the one containing the default measure. Once I threw in a measure (in the SELECT part of the query, not the RETURN) from the non-default fact table, everything worked great!

adding a fact table to a SSAS 2005 cube

Alex Bransky — Mon, 11 Feb 2008 21:28:08 GMT

So you're trying to add a fact table to a cube that you've already created, but you can't figure out how to do so without recreating the cube from scratch? Here's what you do: In the Measures pane in the Cube Structure tab, right-click and select New Measure Group. Then select the fact table, and voila! (This is assuming you've already put the fact table in the data source view.)

addendum: Looks like the standard way to add a dimension to the cube is to right-click on the cube name in the Dimensions window in the Cube Structure tab and select Add Cube Dimension.

SSAS cube: "attribute key not found" error

Alex Bransky — Wed, 06 Feb 2008 23:05:02 GMT

I just spent over an hour trying to figure out why my data tables were correct but I was getting an error about an attribute key not being found (i.e. an unlinkable foreign key). I finally figured out that processing one dimension at a time before processing the cube can get fix whatever is out of sync. [Right-click on the dimension in Solution Explorer to process it separately.]

CPU percent limit in .Net

Alex Bransky — Fri, 01 Feb 2008 23:29:37 GMT

Why doesn't the .Net framework have anything that lets you set a maximum CPU usage for an application? Is it something Windows can't handle? I'd really like to be able to say, "I don't care if this app gets stuck in a loop or whatever, it will never get above 25% CPU."

SQL Server 2005 splash screen

Alex Bransky — Sat, 26 Jan 2008 00:38:06 GMT

Is the SQL Server 2005 splash screen supposed to look like Arkanoid or like Tetris?