Often people ask me how to retrieve the value of an autoincrement column when they are using the MySqlCommandBuilder object.  Generally this is done by appending something like ";SELECT last_insert_id()" onto the generated insert command text.  Command builder objects usually provide some type of syntax where a user can indicate that they want this to be done.  Connector/Net 1.0 had some syntax for this but starting with Connector/Net 5.0 that all changed. 

With the new ADO.Net 2.0 API, Microsoft did not directly provide for any type of API that users could use for selecting this.  With ADO.Net 2.0, there are two things that need to happen.  First, a SELECT statement similar to above must be attached to the INSERT command.  Second, the command object must have its UpdatedRowSource property set to Both or FirstReturnedRecord.  What this does is tell the data adapter update engine to take the …

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Red Hat formally announced the Red Hat Exchange (RHX) at this week's Red Hat Summit in San Diego.  This was a great conference for Linux sysadmins, developers and those who are using or contributing to open source development. It was also nice to see how well JBoss is doing at Red Hat.  Although Marc Fleury left the company some time back, they've retained a huge strength in the JBoss development organization and customers are now getting the benefit of an integrated stack.  There were a lot of folks rooting for a successful integration of JBoss into Red Hat and I think they've made it happen.

There were many technical sessions as well as keynotes highlighting several new initiatives, the most important of which I believe is RHX.  While RHX is not a technical …

Sometimes you may need to create a set of rspec specifications with pretty similar structure and small differences. I’ve got such situation in my project and decided to try to use Ruby’s dynamic code generation features to make my spec file shorter.

I have some multiplexing helper in my templates which allows me to use the same template for different similar pages. This helper returns URL from the set of params and a type. It could accept 5 different url types and raises an Exception when requested URL type is invalid. Without this dynamic code generation feature I would need to create 5 different specifications (one for each URL type) to be able to see each URL type test as a separate line in test results log. But with this simple technique my code looks like following now:

describe VideoHelper, 'when profile_video_url method called' do

  before do

    @user = mock('user')
…

I released version 0.9.8 of my MySQL UDF code generator yesterday and i finally moved development over to my own php-baustelle.de family of sites.

Continue reading "New MySQL UDF generator release, project moved"

Today I upgraded the blog software at sheeri.com (and sheeri.net and sheeri.org). Please let me know if you find something that doesn’t work as expected — awfief@gmail.com.

At the MySQL Users Conference, my good friend Mark Atwood (creator of the free Amazon S3 Storage Engine) mentioned that any site with a login should have OpenID as an option.

Mark, I upgraded for you! I was using Wordpress 1.5.2, now I’m at the “latest” version. Anyway, this is just to let folks know that if you so choose, you may now use OpenId if you wish to login and make comments.

Of course, I do not require login (and have a great spam filter) so that’s just another choice you have.

This is a hack I've heard about a couple times now:

Paul wrote a script that reads from the logfile the queries that are going to be executed moments later. He parses the queries and constructs new select queries that populate the cache with the data that speeds up the upcoming writes. He claims, if I remember correctly, a three to four times speed-increase.

Here's the problem in a nutshell. The master can write transactions in parallel but slaves can only write them in series. [1]

This means you have a lot of optimizations on the master (TCQ and NCQ being examples) that aren't possible on the slave.

What this patch would do is precache the data so it's already available in memory. Since you're pre-reading the binary log you can run SELECTs in parallel on the SLAVEs so that the cache is hot when …

Having just moved apartments, it’s obviously time to get on a plane again.

On Monday I fly off to Stockholm again to attend the MySQL Cluster team meeting. Somehow we’re going to squeeze everybody into the Stockholm office (I’ll post humorous cramped photos, I promise).

Of course the thing to do now is to prepare for the meeting… packing can be done on sunday night or something.

Of course, if you’re in the area, come for food/beer!

...is something that you influence what it will be.

The problem with replication is that we have so many things that we want to do, but we are not that many people. What we do is what everybody does when the to-do list is to long: prioritize. Since the replication features are developed for you (yes, you), we have added a quickpoll on the http://dev.mysql.com/ where you can pick the three most important replication features that you would like to see us focus on next (after the 5.1 GA).

Do you think that on-line checks for table consistency is for weenies that cannot write a simple little script to do that? Please tell us that.

Do you prefer to live on the edge and think that semi-synchronous replication is for safety junkies? Well, we'll be glad to hear your opinion.

Do you think that the YouTube …

We’re on the verge of releasing our code and we’ve spent a lot of time looking at other projects to see what works what doesn’t as far gaining widespread adoption and building a vibrant developer community. There were some obvious differences in the way some projects are managed: Some have paid contributors others do not. Some use OSI approved licenses, others do not. Some had rigid roadmaps set by a small group (or even a single individual) others were more consensus oriented with their planning. Outside of the obvious, it was all terribly confusing and difficult to glean any useful insight from our ad hoc analysis.

Last month when we were at the mySQL conference I was talking to Tony Wasserman of CMU West and he mentioned to me his work in this area. He sent me a draft of his paper titled: A Framework for Evaluating Managerial Styles in Open Source Projects (I don’t have a link yet). In it he analyzed 75 commercial and community …

I had dinner with Zack Urlocker (EVP of Products at MySQL) and Luis Sala (one of my very best hires, ever) last night in San Diego. We talked about a wide range of things, but spent a fair amount of time talking about the people at MySQL, and especially the management team. Zack has recently been sporting long hair (pictured at right) and was pretty open about the nature of the people with whom he works. He didn't say this, but the description I inferred from the conversation was "confident but humble." Those of you who know Zack, or Marten,... READ MORE