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Output can be scalar (single value) or a result set that can be used as a derived table BOL topic Functions (Transact-SQL) has a category listing of built-in functions Two examples are:
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String functions can be used to manipulate character data such as LTRIM to remove leading spaces Date functions can be used to retrieve or manipulate dates such as GetDate() to get the current date
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Functions (User-Defined Functions) Example: You want to accept a ZIP code as input, and retrieve the state and/or city You can create a user-defined function that accepts the ZIP code and retrieves the ZIP code from an existing table Use to hide details of calculations that are to be used in a SELECT statement
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Can be accessed in a SELECT statement or a VIEW Can accept input parameters Output can be scalar (single value) or a result set that can be used as a derived table CLR integrated functions can be created
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Allows use of any NET programming language such as C# or VB Useful when calculation-intensive operations are required Can combine sophisticated technologies such as calling a Web service that is passing data via SOAP
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Stored Procedures Example: You need to automate the process of pulling data out of a database, performing calculation-intensive operations on the data, and then returning information to the user based on the actions This might take dozens or hundreds of T-SQL lines, but could be embedded in a single stored procedure Since the example calls for calculation-intensive operations, you would probably create it as a CLR integrated stored procedure Use for complex queries and/or to implement business rules
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Can have hundreds of statements; can be very complex and can include error messages Cannot be called from a SELECT statement Used to reduce network traffic (ie, one statement calling a stored procedure instead of hundreds of lines sent to the server) Provides a layer of security
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User can execute stored procedures to read or modify data without the need for permissions to underlying tables
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Appendix F: SQL Database Design Object Summary
Can be executed with EXECUTE AS clause causing it to be executed with permissions of any designated user Parameterized stored procedures are considered core defense against SQL injection attacks
Can accept input parameters and can provide output (scalar or derived tables) Can include BEGIN TRANSACTION, COMMIT TRANSACTION, and ROLLBACK TRANSACTION statements Can include TRY CATCH blocks for error catching CLR integrated stored procedures can be created
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DML Triggers Example: After an update, the product inventory is less than 5 An UPDATE trigger sends an email to the ordering department to order more DML triggers are placed on tables DML triggers can respond to UPDATE, DELETE, or INSERT events Use to enforce business rules
A specialized stored procedure Can contain complex processing logic using T-SQL statements or CLR integration Can do all that constraints can do, but with overhead Associated with a table Cannot be called directly Triggers (and only triggers) have access to temporary updated and deleted tables that hold data based on the last INSERT, UPDATE, or DELETE statement Can be disabled with ALTER TABLE tableName TRIGGER triggerName or DISABLE TRIGGER triggerName on tableName Can also be used to roll back modifications that are considered unacceptable
For example, you might want to protect yourself against a possible SQL injection attack where the attacker changes the price of bottles of wine to $001 and then orders cases of the wine An update trigger could check the update, and if the change were out of a specified range, roll back the change
DDL Triggers Example: Management wants to know whenever the definitions of any database objects (such as tables, views, etc) or any databases are modified You create a DDL trigger on the database to monitor all ALTER events and log them to an audit table contained within an auditing database
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