Bill Lin's Blog

Me in A Magic Session

bill — Sat, 27 Jun 2009 07:56:00 GMT

Other than being a software developer, I am also a magician. Check out this blog post (you will probably have difficulties understanding some of the magic jargons if you are not a magician): http://nnylfmit.blogspot.com/2009/06/no-way-jose.html.

Go, MSFT

bill — Sat, 13 Jun 2009 06:40:00 GMT

As an employee, I am glad to see our stock price made new high today, while most other IT stocks went lower. The recent strong uptrend of MSFT shows the recognition on the value of Microsoft, at least by Wall Street. Anyway, we just announced Bing and Windows 7 is on its way. As a shareholder, I would like to see more future growth of our company.

DOS Command Script: Use Date/Time in File Names

bill — Fri, 13 Feb 2009 11:52:00 GMT

Nowadays, we have different choices of script languages in Windows: VBScript, JScript, PowerShell script, etc. Coming from the old DOS world, I still prefer a simple batch (.cmd) script.

Say we have a simple sql query and we want to run it every 10 minutes and save the output to a file. We can simply have a scheduled job to run a .cmd file with the following content:

sqlcmd -i query.sql -o report.txt

If we want to keep a history of the result, it is best if we can have the date and time in the file name. So let us change it to

sqlcmd -i query.sql -o report-%date:~-4,4%%date:~-10,2%%date:~-7,2%-%time:~0,2%%time:~3,2%.txt

The above command will run perfect between 10am and 11:59pm. Between 12am and 9:59am, however, %time:~0,2% will have a space (such as " 9") since %time% formats hours without leading 0.

"time /t" command will always show hours with leading 0. So we have another idea:

for /f "tokens=1,2 delims=: " %%i in ('time /t') do sqlcmd -i query.sql -o report-%date:~-4,4%%date:~-10,2%%date:~-7,2%-%%i%%j.txt

The only problem here is "time /t" is in 12hr format. So you could overwrite earlier results. It seems we still should use %time% and it will be perfect if we replace the space with 0 in the hours. So here is the final script which does the job:

@echo off
setlocal
set timehour=%time:~0,2%
sqlcmd -i query.sql -o report-%date:~-4,4%%date:~-10,2%%date:~-7,2%-%timehour: =0%%time:~3,2%.txt

Moving to Office

bill — Thu, 12 Feb 2009 11:05:00 GMT

Re-orgs happen frequently at Microsoft and I am about to experience one.

I just got two Ship-Its for the product I have been working on for almost 2 years, Microsoft Equipt, which will be discontinued after April 30th. We just finished the last feature of the product: requesting refund via the home page. The feature is now RTW. All in all, I have participated the design and implementation of all two versions of the product, starting from just an idea, all the way to its sunset.

I am going to Join Office and work on a new product.

Microsoft's Effort on 2008 Summer Olympics Coverage

bill — Fri, 08 Aug 2008 06:25:00 GMT

Excited about upcoming Summer Olympics? Microsoft brings you a great digital coverage.

Extracted from a promotional email:

On the eve of 08.08.08 and the excitement around the XXIX Olympiad, Microsoft and NBC Sports have teamed to deliver event coverage on a scale never seen before on the Internet, let alone on TV. NBC and Microsoft will be streaming more than 3,500 hours of Olympics video to millions of online viewers in the United States, including LIVE coverage of every minute of competition from 25 sports. This is the largest media event ever done on the web, an unprecedented moment in the history of the Internet. …

Here are all the ways you can experience the 2008 Summer Olympics from Microsoft and NBC:

· Click http://www.nbcolympics.com/video to jump right in and experience high-quality, interactive video using Silverlight. This could even be better than being in Beijing! …

· Beginning tomorrow and throughout the Games, the MSN homepage will prominently feature a dynamic Olympics module which will enable people to see results (or hide them if you don’t want any spoilers), get the latest news and see exclusive video coverage. …

· Get the latest medal counts by sport or by country, or find out about all 10,000 of the athletes competing in the 2008 Summer Games using the Live Search Olympics Instant Answer

· Install the new MSN Toolbar that gives you one click access to the medal tally and many other highlights.

· Beginning August 9th, Zune Marketplace will kick off a series of daily 2008 Olympic Games videos from NBC Sports, giving viewers special on-the-go access to the 2008 Beijing Olympic Games. For approximately 99 cents–$1.99 per episode (with post-Games content TBD), footage will include memorable highlights from the Opening and Closing Ceremonies, “best of” compilations, “best match” replays and a post-Games wrap-up feature. Users will be able to download each episode onto their Zune device for viewing whenever and wherever they go. …

…

Check it out, tell your friends & enjoy.

Weird Error of Log Parser

bill — Sat, 05 Jul 2008 00:18:00 GMT

Log Parser is a great Microsoft tool for processing text-based data. Its scriptable COM components can be easily consumed by .NET applications.

Recently I ran into an interesting error when using the COM components with C#. The data input for the parser is a TSV ((tab-separated values) formatted text log file. Here is code:

LogQueryClassClass logQuery = new LogQueryClassClass();
COMTSVInputContextClassClass inputContext = new COMTSVInputContextClassClass();
inputContext.iCheckpoint = "MyCheckpoint.lpc";
ILogRecordset recordSet = logQuery.Execute("SELECT * FROM test.log", inputContext);

I got all NULL values in the result records or the following exception:

Unhandled Exception: System.Runtime.InteropServices.COMException (0x80094004): Error parsing query: Header for file "test.log" contains an empty field name declaration [Unknown Error]

The weird thing is if I commented out the line which assigns iCheckpoint for incremental parsing, the code would work. Eventually I found out that I needed to specify the CodePage of the inputContext since the text input was encoded in Unicode. So the solution is to add the following line:

inputContext.CodePage = -1; // -1 is Unicode, default (0) is the system codepage

Live Maps China RTW

bill — Thu, 13 Dec 2007 09:03:00 GMT

I got an email this morning saying the LIve Maps China was live today. According to the email, this first public release supports most basic map and local search features across China with details for 114 cities, plus a Public Transit feature for 11 cities,

I found my high school in the map and even the cafererias in my university.

If you know Chinese, try it now: http://ditu.live.com/ ('ditu' means 'maps' in Chinese)

SQLClient Support for the New Date and Time Types in SQL Server 2008

bill — Sun, 25 Nov 2007 12:19:00 GMT

Prior to SQL Server 2008, SQL developers were restricted to using two types to work with date and time values: datetime and smalldatetime. While they are sufficient in most user scenarios, there are some limitations:

1) Both types include both the date value and time value. There is no way to store only the date or time part. This causes wasted storage and difficulties in computation and indexing.

2) The range supported of the datetime type does not align with the range of .NET CLR DateTime type.

3) The datetime precision of .333 seconds is not sufficient for some applications.

4) The types are not time-zone aware.

To address these limitations, SQL Service 2008 introduced four new date/time data types: date, time, datetime2, datetimeoffset. The first two types are date-only and time-only respectfully. time type supports user-defined fractional second precision. datetime2 combines date and time into a single data type. datetimeoffset has all the features of datetime2 with an additional time zone offset. The range of datetime2 and datetimeoffset are fully aligned with the .net CLR types DateTime and DateTimeOffset (introduced in .NET Framework 3.5).

In .NET Framework 3.5, SQLClient has been extended to support the four new types.

Type Version System

To enable the feature, the first step is to explicitly specify the Type Version System to SQL Server 2008 or Latest in the connection string. Otherwise, the client would be treated like a SQL Server 2005 client. Here is the code snippet:

using (SqlConnection conn = new SqlConnection("Server=localhost;Integrated Security=SSPI;Type System Version=SQL Server 2008"))

{

conn.Open();

//...

}

Scale for time, datetime2, and datetimeoffset

For time, datetime2, and datetimeoffset, users are allowed to define the fractional second precision. It might sound confusing, the correct term for it is scale. With scale = x, the increment would be 1/10^X seconds. So you should use the Scale property in SqlParameter to specify the fractional second precision and you look for the Scale column in the schema table returned by SqlDataReader.GetSchemaTable().

CLR Type Mapping and Inference

date, datetime2 are mapped to DateTime. time is mapped to TImeSpan. datetimeoffset is mapped to DateTimeOffset. datetime2 and datetimeoffset have the same range as their CLR counterparts.

For SqlParameter, if you use AddWithValue method, DateTime would always be inferred as datetime. To explicit specify the value as datetime2, you need to set the SqlDbType to SqlDbType.DateTime2.

Some New SqlClient APIs Related to New Date/Time Types

New SqlDbType enumerations:

SqlDbType.Date

SqlDbType.Time

SqlDbType.DateTime2

SqlDbType.DateTimeOffset

New SqlDataReader methods:

SqlDataReader.GetDateTimeOffset()

SqlDataReader.GetTimeSpan()

Lessons Learned from A Scam

bill — Thu, 09 Aug 2007 07:49:00 GMT

This post contains some hard lessons I recently learned through a craigslist transaction. Hopefully it could help you to become more cautious if you decide to sell something through craigslist or other similar online sites.

A while ago I won a competition at the company and the prize was an Xbox 360 with a 20G hard drive. However, I'm not a big fan of video games and I decided to sell the brand-new sealed package. Since I had some previous good experience with selling things through craigslist, I posted an ad in craigslist again this time. In Amazon the retail price for this type of Xbox 360 is $400 and I asked for $300. It was obviously a good deal and a few guys replied to the ad immediately after it was posted. I decided to make a deal with the guy who replied first. He asked to meet in the same afternoon. We made the transaction and everything seemed to be running smoothly. However, later in the evening, the guy sent me an email claiming the hard drive didn't work. I was a little bit surprised because when I handed it to him, the box was still sealed.

I replied the next morning to talk with him and ask for the error he got. I told him it's hard to find out exactly when the hard drive went wrong but I'd like to help to solve the problem by contacting Microsoft Support. However, he became nasty and claimed I was running a scam. In his email, he talked to me in a very threatening way. He said he recorded my license plate number (and proved it by including the correct number in the e-mail) and he would take care of this the hard way if I didn't refund him. This was totally unexpected as I was responding to his emails all the way along. To avoid confrontation with a potentially dangerous guy, I refund him fully in the same evening. However, after coming back home, I found the controller was missing in the box. Since then, he has never answered my calls or replied to my emails.

I’m very suspicious he actually conned me. I feel it’s possible the original Xbox has no problem at all and he just replaced it with a bad hard drive and stole the controller with it. The email he sent to me was just to scare me and make me refund him his money.

Several lessons learned:

1. Always be very cautious when you use any public sites to make some deals. I'm not complaining about any specific website but most of them are open to everyone. It would be safer if the targeted audience could be limited. As far as I know, in Windows Live Expo, you could specify that the ads you've posted can only be viewed by people in your community, such as among all Microsoft employees.

2. Protect your identity as much as possible when dealing with strangers from the Internet. Only provide necessary information. Of course, if someone acts like this guy who purposely recorded your license plate number during the meeting, there's not a lot you could do about it.

3. Don't lose your composure. I could have found out the controller was missing up front if I had more composure. Of course the result might still be the same: the guy could have claimed he would bring it another time and then disappeared.

Meanwhile, doing business online can be enjoyable and I wish everybody good luck.

Performance Tips with SqlClient

bill — Mon, 11 Jun 2007 09:26:00 GMT

Here's a list of things to know if you'd like achieve the best performance/scalability with SqlClient:

Use SqlBulkCopy to send large sets of data to the server
Set DbDataAdapter.UpdateBatchSize to send batches to the server
Use strongly typed getters instead of GetValue/GetSqlValue
Turn on CommandBehavior.SequentialAccess and call GetChars/GetBytes when working with BLOBs
Use parameterized queries (Avoids conversion to and from nchar type)
Wrap multi-step operations in a transaction
Use connection pooling

You might also be interested in check out this article: Improving ADO.NET Performance.

Seattle Works Day 2007

bill — Sun, 10 Jun 2007 08:33:00 GMT

1,000+ participants at 30+ project sites added up to nearly 4,000 hours of service in a single day. Seattle Works Day is a fun and easy way to green up Seattle.

Microsoft also broke Seattle Works Day records. We had three projects this year with over 300 participants - our largest group ever. Microsoft has sponsored each individual on the Microsoft team so it's free for us.

I signed up for the Washington Middle School project. We went weeding, edging, and laying bark mulch at the school. Our help is important as the Seattle School District has limited resources and they have committed to reducing the use of pesticides to make this area safer for all.

The good: the Green theme. It's great to see we're making an effort to keep our urban green spaces beautiful and available for safe outdoor recreational activities.

The bad: nothing really bad, although I felt the music was a little too loud at the after-party. It could have been easier for me to meet more people and talk with them.

The dirty: it was raining throughout the time we were doing the project. I'm actually a special person who enjoys raining. With the rain, getting dirty part is even more fun. :)

I joined Seattle Works Day 2006 and I'm looking forward to Seattle Works Day 2008.

New Adventure

bill — Thu, 31 May 2007 06:06:00 GMT

After working in SQL for more than 19 months, I have decided to pursue a new opportunity in Office Live. On June 1, I’ll begin my Office Live adventure.

Microsoft Surface

bill — Wed, 30 May 2007 10:12:00 GMT

Cool product, cool name, cool website. I saw the demo in our company meeting and I really like it.
http://www.microsoft.com/surface/

Executive Q&A: What the new surface computing category means for Microsoft and consumers
http://www.microsoft.com/presspass/features/2007/may07/05-29Surface.mspx

Microsoft Launches New Product Category: Surface Computing Comes to Life in Restaurants, Hotels, Retail Locations and Casino Resorts
http://www.microsoft.com/presspass/press/2007/may07/05-29MSSurfacePR.mspx

10 Reinvigorating Facts About Microsoft's Profits

bill — Mon, 28 May 2007 02:39:00 GMT

I'd like to share an interesting article on Microsoft's profits published a while ago:

10 Reinvigorating Facts About Microsoft's Profits

...

Microsoft last week announced quarterly revenue of $14.4 billion and net income of $4.93 billion. In other words, Microsoft's daily net income is about $55 million. That's $55 million in pure profit every 24 hours. Do some quick math and you'll learn it takes Microsoft only about...

10 hours or so (yes, hours!) to exceed Red Hat's (NYSE: RHT - News) quarterly net income of $20.5 million.

four days to exceed Research In Motion's (NasdaqGS: RIMM) quarterly net income of $187.9 million.

four days to exceed Starbucks' (NasdaqGS: SBUX) quarterly net income of $205 million.

one week to exceed Nike's (NYSE: NKE - News) quarterly net income of $350.8 million.

two weeks to exceed McDonalds' (NYSE: MCD - News) quarterly net income of $762 million.

two weeks to exceed Apple's (NasdaqGS: AAPL) quarterly net income of $770 million.

18 days to exceed Google's (NasdaqGS: GOOG) quarterly net income of $1 billion.

23 days to exceed Coca-Cola's (NYSE: KO - News) quarterly net income of $1.26 billion.

five weeks to exceed IBM's (NYSE: IBM - News) quarterly net income of $1.85 billion.

10 weeks to exceed Wal-Mart's (NYSE: WMT - News) quarterly net income of $3.9 billion.

...

While I feel impressed and proud, I realize it's challenging for Microsoft to keep or even exceed the current achievement. To grow a multi-billion business, in my opinion, is way harder than to grow a multi-million business. The dynamics of the IT software industry are changing in a very fast pace. Customers expect constantly innovations and there’re new competitors coming up every day. Nevertheless, I strongly believe Microsoft will continue to excel with her smart employees, firm leadership, and healthy corporate culture.

Progressive Development

bill — Thu, 19 Apr 2007 11:22:00 GMT

My mentor James at Microsoft recently started a blog with the name "Progressive Development". It talks about best and worst practices of software engineering in the format of entertaining conversations between two figures Motley and Maven.

I knew James through his class at Microsoft and he is a fantastic teacher with excellent engineering knowledge and passion on software quality. His blog entries on engineering practices are definitely worth reading.

Progressive Development: Zany Adventures in Software Engineering with Maven and Motley