Instructor InputsSession 5..Session OverviewThis session includes the following topics: Web pot

1.0 Querying, Managing, and Administering Databases using SQL Server 2005 Collaborative Session 4 Collaborate Session 5 Objectives In this session, you will learn about: Web services Sec

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Instructor Inputs S e

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This session includes the following topics:

Best practices

Tips and Tricks

Slide 1

Installing Windows XP Professional Using Attended Installation

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Querying, Managing, and Administering Databases using SQL Server 2005

Collaborative Session 4 Collaborate Session 5

Objectives

In this session, you will learn about:

Web services Securing HTTP endpoints Best practices that can be considered while using triggers and transactions in SQL Server 2005

Tips and tricks that will help you effectively use triggers and transaction statements in SQL Server 2005

FAQs related to triggers and managed code in SQL Server 2005

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5.4 Instructor Inputs ¤NIIT

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Knowledge Byte

Web service:

Exposes a number of methods to provide functionality that can

be used by one or more applications, regardless of the programming languages, operating systems, and hardware platforms used to develop them.

Uses Internet standards, such as HTTP and XML, to communicate with client applications

Is similar to a component that provides a specific functionality.

Can be created by using any programming language in the NET suite, such as Visual Basic NET, Visual C# NET, and Visual C++ NET

Displays data on the Internet to trusted suppliers, customers,

or business partners However, you need to ensure that only appropriate people gain access to a critical data Therefore, it

is important to secure the HTTP endpoint.

Slide 3

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Knowledge Byte (Contd.)

To secure endpoints, perform the following steps:

Create appropriate user accounts within the database.

Grant permissions for any stored procedure or user-defined functions that the user or roles need to access by using the Web service.

Grant permissions to allow users or roles to connect to the HTTP endpoints.

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Best Practices

Use sp_recompile system procedure on a trigger or a stored procedure to recompile so that the updated procedure and trigger can be used.

Disable all the triggers on a database if you do not want to use them for sometime

The following command allows you to disable all triggers:

EXEC sp_MSforeachtable @command1="ALTER TABLE?

DISABLE TRIGGER ALL"

Slide 5

Installing Windows XP Professional Using Attended Installation Querying, Managing, and Administering Databases using SQL Server 2005

Best Practices (Contd.)

If you have to write complex procedural code use the CLR managed code It is faster than T-SQL statements

If you have data access task that contain little or no procedural code, use T-SQL programming

This is because you can write and execute it directly from the Code Editor Result window.

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Tips and Tricks

You can create a trigger to extract the information of the record that is being changed by using the inserted and deleted tables.

You can use the managed code to create a trigger, stored procedure, and user defined function

You can resolve deadlocks in transactions by using a TRY/CATCH block

Use exception handling with the transactions If any exception occurs in a transaction execution, rollback the transaction

Slide 7

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How can you perform an action when the schema of a table

is changed?

You can use DDL triggers to perform an action when the schema of a table is changed DDL triggers can only be created to fire AFTER the triggering event has occurred, as opposed to DML triggers that can fire AFTER the event or INSTEAD OF the event.

FAQs

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Which category of triggers is available with SQL Server 2000?

SQL Server 2000 supports DML triggers SQL Server 2005 has introduced another category of trigger named DDL trigger.

FAQs (Contd.)

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How can you restrict an update on the column of a table?

To restrict a column update, use the following syntax:

CREATE TRIGGER <trigger name>

ON <db name>.<table name>

FOR UPDATE AS

IF UPDATE(<col name>) BEGIN

RAISERROR ('Cannot be updated',10,1) ROLLBACK TRANSACTION

END GO

FAQs (Contd.)

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Which new feature has been added to SQL Server 2005, which is an enhancement to T-SQL?

The NET Common Language Runtime is an enhancement to T-SQL It gives much more flexibility to programming in SQL Server 2005 as compared to T-SQL.

FAQs (Contd.)

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In which different languages can you write managed code?

You can write managed code by using Visual Basic, Visual C#, and Visual C++.

FAQs (Contd.)

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Challenge

Which of the following is not a standard for Web service?

UDDI HTML WSDL SOAP

Answer:

HTML

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Challenge (Contd.)

Which of the following requirements does an application need to meet to use a Web service?

A standard format for designing a Web service

A standard language for sending messages from the client application to the Web service

A common data representation format of the data exchanged

A mechanism to allow a Web service to locate a client

Answer:

A common data representation format of the data exchanged

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Which of the following Web service standard describes a Web service?

WSDL UDDI XML SOAP

Answer:

WSDL

Slide 15

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Which of the following is a correct sequence of steps to secure HTTP endpoints?

1 Create appropriate user accounts within the database.

2 Grant permission for a stored procedure or user-defined functions that the user needs to access by using a Web service.

3 Grant permission to users to connect to HTTP endpoints.

2 Grant permission to users to access HTTP endpoints.

3 Grant permission to users for a stored procedure or user-defined functions that the user needs to access by using a Web service.

2 Grant permission for a database that the user needs to access by using a Web service.

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Which of the following is a correct sequence of steps to secure HTTP endpoints?

1 Grant permission for a stored procedure or user-defined functions that the user needs to access by using a Web service.

Answer:

2 Grant permission for a stored procedure or user-defined functions that the user needs to access by using

a Web service.

Slide 17

Which of the following information is not present in a WSDL document?

The Web service available for a given Web site.

The URL at which a Web service can be attached The format used to access the Web service The type of language that is used to create a Web service

Answer:

The type of language that is used to create a Web service

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2 c A common data representation format of the data exchanged

4 a i Create appropriate user accounts within the database

ii Grant permission for a stored procedure or user-defined functions that the user needs to access by using a Web service

iii Grant permission to users to connect to HTTP endpoints

5 d The type of language that is used to create a Web service

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1 Which of the following is true about DML triggers?

a They can be nested up to 35 levels

b They can return values

c They can be directly invoked

d They can prevent incorrect and unauthorized changes in data

2 Harry has updated a record in a table that has an update trigger Which magic

table/tables are used when a record is updated?

a Inserted table

b Updated table

c Deleted table

d Both inserted and deleted tables

3 Which of the following is not a DML trigger?

a Insert trigger

b Database trigger

c Delete trigger

d Update trigger

4 Which trigger can be used on a view?

a After trigger

b Instead of trigger

c Insert trigger

d Delete trigger

5 Which property of ACID ensures that either all or none of the data modifications are

performed?

a Atomicity

b Consistency

c Isolation

d Durability

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c Intent locks

d Exclusive locks

8 Which isolation level specifies that a transaction can read the data modified by the current transaction even before the modifications are committed?

9 Which object is not created by using managed code?

a Stored procedure

c Trigger

10 Which authentication method uses MD5 hashing algorithm in the CREATE

ENDPOINT statement?

Solutions

1 They can prevent incorrect and unauthorized changes in data

2 Both inserted and deleted tables

3 Database trigger

4 Instead of trigger

5 Atomicity

6 Lost updates

7 Shared locks

10 DIGEST

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At times, while performing data manipulation on a database object, you might also need

to perform another manipulation on another object A trigger is a block of code that

constitutes a set of T-SQL statements activated in response to certain actions such as

insert or delete Triggers are used to ensure data integrity before or after performing data

manipulations

Discuss the different types of triggers that can be created by using SQL Server 2005

Instructor Inputs

You can conduct the discussion as follows:

Move the discussion toward the different types of triggers

Encourage the students to discuss the new category of triggers called DDL triggers

Solution

The SQL Server supports the following types of triggers:

Data Modification Language (DML) triggers

Data Definition Language (DDL) triggers

DML Triggers

A DML trigger is fired when data in the underlying table is affected by DML statements,

such as INSERT, UPDATE, or DELETE Depending on the operation that is performed,

the DML triggers can be further categorized as:

table

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