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Visual Studio for Database Professionals
MSDN TechTalk
M. Lattmann, Consultant
Wallisellen, 4.12.2006
Basel
·
Baden
·
Bern
·
Lausanne
·
Zürich
·
Düsseldorf
·
Frankfurt/M.
·
Freiburg i. Br.
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Hamburg
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München
·
Stuttgart
Agenda

Data Generation


Database Unit Testing


Knowledge
transfer is only
the beginning.
Knowledge
application is
what counts.

Kurs- bzw. TC-Namen eingeben
Creating Unit Tests
Extending Unit Tests
Extensibility




Generating Test Data
Generator Extensibility
Distributor Extensibility
Conditions Extensibility
Core messages
2
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Demo
Generating Test Data
Kurs- bzw. TC-Namen eingeben
3
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Generating Test Data
 Value generators
 Simple generators for each data type






Strings: ASCII and Unicode ((var)char, n(var)char, (n)text)
Numbers: tinyint, smallint, int, bigint, real, float, decimal, numeric, money
Binary ((var)binary, image)
Date and Time
UniqueIdentifier (GUID)
Bit
 Complex generators
 Foreign Key, Regular Expression, Data Bound Generator
 Distributions
 Uniform, Normal, NormalInverse, Exponential, ExponentialInverse
 Can import column distributions from production database (*)
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(*) Not implemented in CTP7
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Agenda

Data Generation


Database Unit Testing


Knowledge
transfer is only
the beginning.
Knowledge
application is
what counts.

Kurs- bzw. TC-Namen eingeben
Creating Unit Tests
Extending Unit Tests
Extensibility




Generating Test Data
Generator Extensibility
Distributor Extensibility
Conditions Extensibility
Core messages
5
© 2006
Unit Testing
 Do changes break your existing code?
 Tests for
 Stored Procedures, Functions
 Triggers
 Any SQL
 Unit test designer is SQL focused
 Work in the language of your choice: T-SQL, C#, VB.NET
 Builds on existing Unit Test functionality in Team System
 Works together with your application tier unit tests
 Well established in .NET development
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Database Unit Testing
 Automatically generate unit tests stubs for:
 Stored Procedures, Functions, Triggers
 Test Validation (assertions)
 T-SQL (server based) Assertions
 RAISERROR command
 Client Side Assertions
 None Empty ResultSet
 Row Count
 Execution Time, …
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Demo
Unit Testing
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© 2006
Pre & Post Test Scripts
 Automatic Deployment Integration
 Automatically deploy database project prior to running tests
 Data Generation Integration
 Automatically generate data based on generation plan prior to
running tests
 Test Scripts use standard Team System Unit Tests
 Pre- und Post Test Scripts are specific for a single unit Test.
TestInitialize() and TestCleanup() are common within a test class.
 Generated Code can be extended using C# or VB.NET
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Pre & Post Test Scripts
Per test project
(DatabaseSetup.cs)
Per test class
per Test
Per Test
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[AssemblyInitialize]
...
DeployDatabaseProject();
GenerateData();
[TestInitialize] Common Script
[Test]
Pre-Test 1
Test 1
Post-Test 1
[TestCleanup()] Common Script
[TestInitialize()] Common Script
[Test]
Pre-Test 2
Test 2
Post-Test 2
[TestCleanup()] Common Script
[AssemblyCleanup]
...
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<DatabaseUnitTesting>
<DatabaseDeployment ...
<DataGeneration ...
</DatabaseUnitTesting>
App.config
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Managing Transactions in Unit Tests

Capability of putting tests in automatic rollback mode to always
maintain original state of database

Implementation in T-SQL
BEGIN TRANSACTION TestTransaction
UPDATE "Order Details" set Quantity = Quantity + 10
IF @@ROWCOUNT!=50
RAISERROR('Row count does not equal 50',16,1)
ROLLBACK TRANSACTION TestTransaction
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Managing Transactions in Unit Tests

C#, per Test
[TestMethod()]
public void dbo_InsertTable1Test()
{
CommittableTransaction tx = new CommittableTransaction();
ExecutionContext.Connection.EnlistTransaction(tx);
PrivilegedContext.Connection.EnlistTransaction(tx);
// run tests
tx.Rollback();
}
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Managing Transactions in Unit Tests
 C#, for all Tests
TransactionScope _trans;
[TestInitialize()]
public void Init() {
_trans = new TransactionScope();
base.InitializeTest();
}
[TestCleanup()]
public void Cleanup()
{
base.CleanupTest();
_trans.Dispose();
}
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Demo
Extending Unit Tests
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14
© 2006
Agenda

Data Generation


Database Unit Testing


Knowledge
transfer is only
the beginning.
Knowledge
application is
what counts.

Kurs- bzw. TC-Namen eingeben
Creating Unit Tests
Extending Unit Tests
Extensibility




Generating Test Data
Generator Extensibility
Distributor Extensibility
Conditions Extensibility
Core messages
15
© 2006
Generator Extensibility
 Team System has many Extension Points
 Generator Extensibility is just an Example
 Implemented by .NET Developer
 Used by DB Professional
Kurs- bzw. TC-Namen eingeben
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Data Generator Extensibility
 Generators
 Implement:
 IDesigner
 IGenerator
 Base class
 Generator
 Attributes
 GeneratorAttribute
 GeneratorNameAttribute
 Distributions
 Implement:
 IDistribution
 Conditions
 Implement:
 ICondition
Kurs- bzw. TC-Namen eingeben
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Registration
 Generators and Distributions have to:
 Live in or under the: %ProgramFiles%\Microsoft Visual Studio
8\DBPro\Extensions directory
 Get registered in the %ProgramFiles%\Microsoft Visual Studio
8\DBPro\Microsoft.VisualStudio.TeamSystem.Data.Extensions.xml file
 Be strong key signed
<?xml version="1.0" encoding="us-ascii"?>
<types version="1">
<type>Microsoft.VisualStudio.TeamSystem.Data.Generators.RegexString,
Microsoft.VisualStudio.TeamSystem.Data.Generators,
Version=2.0.0.0,
Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a
</type>
<type>Microsoft.VisualStudio.TeamSystem.Data.Generators.Exponential,
Microsoft.VisualStudio.TeamSystem.Data.Generators,
Version=2.0.0.0,
Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a
</type>
</types>
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Demo
Generator Extensibility
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Core messages

All Tasks of DB Developers integrated in
the Team System Lifecycle


Strong Support of Database Changes


Data are always
part of the game.


Unit Tests, Data Generation
Integrated in MSBuild

Kurs- bzw. TC-Namen eingeben
Automatically generate Change Scripts
Repository, Versioning
Strong Testing Features


Less support for DBAs and DB Architects
Automated Regression Tests
Extensible
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Pricing, Licensing and Availability
 CTP 7 Available Today
 Availability for MSDN Universal Subscribers
 Around 8. Dec 2006
 General availability in January 2007:
 Included in Team Suite at No Extra Cost
 Purchase as an individual Edition
 Same pricing as other Team System Editions
Kurs- bzw. TC-Namen eingeben
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Literature

Kurs- bzw. TC-Namen eingeben
Ambler, Sadalage: Refactoring
Databases: Evolutionary Database
Design
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