a developer's breadcrumb

Data Type conversion: SQL Server – CLR .Net Framework

robertoschiabel — Sat, 05 Dec 2009 12:47:42 +0000

Using SQL Data Type in CLR .Net need to know about data conversion.

We know that float data type is not the appropriate choice if there are few decimals, so better use decimal data type (or money in SQL Server ).
Copied&Pasted from MSDN, here is list of data type convertion between SQL Server and CRL .Net.

SQL Server data type	CLR data type (SQL Server)	CLR data type (.NET Framework)
bigint	SqlInt64	Int64, Nullable
binary	SqlBytes, SqlBinary	Byte[]
bit	SqlBoolean	Boolean, Nullable
char	None	None
cursor	None	None
date	SqlDateTime	DateTime, Nullable
datetime	SqlDateTime	DateTime, Nullable
datetime2	SqlDateTime	DateTime, Nullable
DATETIMEOFFSET	None	DateTimeOffset, Nullable
decimal	SqlDecimal	Decimal, Nullable
float	SqlDouble	Double, Nullable
geography	SqlGeography (*)	None
geometry	SqlGeometry(*)	None
hierarchyid	SqlHierarchyId(*)	None
image	None	None
int	SqlInt32	Int32, Nullable
money	SqlMoney	Decimal, Nullable
nchar	SqlChars, SqlString	String, Char[]
ntext	None	None
numeric	SqlDecimal	Decimal, Nullable
nvarchar	SqlChars(**)	String, Char[]
nvarchar(1), nchar(1)	SqlChars, SqlString	Char, String, Char[], Nullable
real	SqlSingle	Single, Nullable
rowversion	None	Byte[]
smallint	SqlInt16	Int16, Nullable
smallmoney	SqlMoney	Decimal, Nullable
sql_variant	None	Object
table	None	None
text	None	None
time	TimeSpan	TimeSpan, Nullable
timestamp	None	None
tinyint	SqlByte	Byte, Nullable
uniqueidentifier	SqlGuid	Guid, Nullable
User-defined type(UDT)	None	The same class that is bound to the user-defined type in the same assembly or a dependent assembly.
varbinary	SqlBytes, SqlBinary	Byte[]
varbinary(1), binary(1)	SqlBytes, SqlBinary	byte, Byte[], Nullable
varchar	None	None
xml	SqlXml	None

(*) this type is defined in Microsoft.SqlServer.Types.dll, which is installed with SQL Server and can be downloaded from the SQL Server 2008 feature pack.

(**) SqlStringSQLChars is a better match for data transfer and access, and SQLString is a better match for performing String operations.

See complete page Mapping CLR Parameter Data on MSDN.

source: MSDN Mapping CLR Parameter Data

Technorati tags: SQL Server, .Net, Data Type

Agile process and customers

robertoschiabel — Wed, 02 Dec 2009 09:33:32 +0000

What is customer’s role in agile process ?
It’s an heavy role.

What if the customer doesn’t care?
“Well, it’s not my business!” we might say…but a successfull project mean a complete partecipation by every character.

So, someone (whatelse if not us?) need to involve the costumer the right way.
It’s very simple, Jacopo Romei talked about it in his talk (Tutti i miei sbagli…) at last Agile Day: quantify your contribute to customer business.

Please think about the value your job give to customer’s business.

Technorati tags: Agile, Customer

A month passed by …

robertoschiabel — Sun, 29 Nov 2009 23:35:01 +0000

a month … and 40 years.
Mrs Internet (former Miss Arpanet) had her 40 birthday last Oct 29.
Why she?

Because a (over) 40 woman, still hasn’t show her best.
Happy birthday, Mrs Internet.

Free ebook from Microsoft: Microsoft® Application Architecture Guide, pattern&practise 2nd Edition

robertoschiabel — Sat, 28 Nov 2009 23:03:39 +0000

A brand new version (2nd edition) of this book: Microsoft® Application Architecture Guide, pattern&practise

Introducing the Guide
The goal of this guide is to help developers and solution architects build effective,
high quality applications on the Microsoft platform and the .NET Framework more
quickly and with less risk by leveraging tried and trusted architecture and design
principles and patterns.
The guide provides an overview of the underlying principles and patterns that provide
a solid foundation for good application architecture and design.
[...]

You may buy this book (example, this link on Amazon) or download from Microsoft Download Center (via this link).

source #1: Microsoft Application Architecture Guide, 2nd Edition
source #2: patterns & practices Application Architecture Guide 2.0 project site
source #3: New book: Microsoft Application Architecture Guide, Second Edition

Technorati tags: Application Architecture, guide, ebook

Backup any smartphone

robertoschiabel — Wed, 25 Nov 2009 00:11:56 +0000

Have you ever thought about backup your pc? why not?
and backup your smartphone? why yes?
Anyway, whatever your smartphone is (Android, Blackberry, iPhone, Palm, Symbian, Windows Mobile) this post at Gizmodo provide a solution for every os.

Read full article here How To: Back Up Any Smartphone.
Actually, standard solution for Windows Mobile via ActiveSync or Windows Mobile Device Center, didn’t work with my smartphone (contacts, messages, ecc not available for sync ;( ).

source: Back Up Any Smartphone’s Contents [Backup]

Testing Resharper 4.5

robertoschiabel — Mon, 23 Nov 2009 21:30:31 +0000

Just a first, quick, feedback about Resharper 4.5.1 (build 1274 and 1288).
Very usefull writing methods, autocompletition on brackets and method’s firm, plus naming convention declaring variabiables, and unit test section.
Unfortunately, it seems to me very slow providing methods&props of my classes, and executing unit tests too (read here).

Technorati tags: Visual Studio, Resharper

Samsung SGH-I600 tips & tricks

robertoschiabel — Thu, 19 Nov 2009 05:15:26 +0000

After about 15 months, I consider this toy very … very!
But, an heavy daily usage made standard battery very shorty;
in the beginning, it lasted 6+ hours (with bluetooth and 3G on); now it’s life is about less than 3 hour.
So, I looked for some tips& tricks post, just to try make me usage healthier.

I found old posts, of course; most of info are old or useless in my daily usage, but you may find something usefull, so please read Definitive guide to improving the battery life of your debranded WM5 i600, Mad scientist conducts exhaustive tests.

I haven’t had a single test, so please read it at your own risk.

Hyper-V videos section

robertoschiabel — Mon, 16 Nov 2009 23:59:33 +0000

Hyper-V represents the virtualization solution by Microsoft.
Lots of times you wish see a video talking about architecture, features, configs, etc.
Lately I discovered a video setions containing more than 10 videos … so far.

Here are few examples:

And so on…

full list here Hyper-V videos on TechNet Microsoft

Technorati tags: Hyper-V

Free ebook from Microsoft: Deploying Windows® 7 Essential Guidance from the Windows 7 Resource Kit and TechNet Magazine

robertoschiabel — Sat, 14 Nov 2009 19:36:38 +0000

A brand new free ebook by Microsoft.

Overview
Microsoft’s eBook Deploying Windows® 7 Essential Guidance from the Windows 7 Resource Kit and TechNet Magazine combine selected chapters written by industry experts Mitch Tulloch, Tony Northrup, Jerry Honeycutt, Ed Wilson, and the Windows 7 Team with select Windows 7 articles from TechNet Magazine. Sample topics include: Deployment Platform, Planning Deployment, Testing Application Compatability, and 8 Common Issues in Windows 7 Migrations.

download here: Deploying Windows® 7 Essential Guidance from the Windows 7 Resource Kit and TechNet Magazine

Technorati tags: Windows7, ebook

Virtual vs Abstract

robertoschiabel — Tue, 10 Nov 2009 21:39:21 +0000

Another remind for myself

abstract:

[...]an abstract property declaration specifies that the accessors of the property are virtual, but does not provide an actual implementation of the accessors. Instead, non-abstract derived classes are required to provide their own implementation for the accessors by overriding the property. Because an accessor for an abstract property declaration provides no actual implementation, its accessor-body simply consists of a semicolon. [...]

virtual:
same as abstract, except subclasses may provide their own implementation.

more info: Virtual, sealed, override, and abstract accessors (MSDN)
and here What is the difference between abstract function and virtual function?

Technorati tags: Abstract, Virtual