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In-Line Table-Valued User-Defined Functions
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An in-line table-valued user-defined function is a special type of table-valued user-defined function. Its purpose is to implement parameterized views. The syntax of an in-line table-valued user-defined function is a bit different from the syntax of other functions:
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Special Types of Procedures
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Create Function [owner_name.]function_name ( [ {@parameter_name scalar_data_type [= default]} [,...n] ] ) Returns Table [With {Encryption|Schemabinding}[,...n] ] [As] | Return (select-stmt)
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You do not have to define the format of the return value. It is enough to specify just the table keyword. An in-line table-valued function does not have the body of a function. A resultset is created by a single Select statement in the Return clause. It is best to demonstrate this feature with an example. The following function returns only a segment of a table based on a role the user belongs to. The idea is that a manager or any other employee can see only equipment from his own department:
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Create Function fn_DepartmentEquipment ( @chvUserName sysname ) Returns table As Return ( Select InventoryId, Make + ' ' + model Model, Location From Inventory inner join Contact C On Inventory.OwnerId = C.ContactId Inner Join Contact Manager On C.OrgUnitId = Manager.OrgUnitId Inner Join Equipment On Inventory.EquipmentId = Equipment.EquipmentId Inner Join Location On Inventory.LocationId = Location.LocationId Where Manager.UserName = @chvUserName ) Go
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SQL Server 2000 Stored Procedure Programming
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You can use this function in any place where a view or table is allowed, such as in a Select statement:
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Select * From fn_DepartmentEquipment ('tomj') Go
Figure 9-6 shows the result of such a statement.
Figure 9-6.
Using an in-line table-valued user-defined function
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Special Types of Procedures
Managing User-defined Functions in Enterprise Manager
You can access user-defined functions from Enterprise Manager as shown in Figure 9-7. If you double-click a function, SQL Server displays a modal form for editing its properties (that is, code and permissions). This editor is identical to the editor you use to edit stored procedures (see Figure 9-8).
Figure 9-7.
Managing user-defined functions in Enterprise Manager
SQL Server 2000 Stored Procedure Programming
Figure 9-8.
Editing user-defined functions
If you right-click a function and select New User Defined Function, SQL Server opens a form with a template for creating a new function (see Figure 9-9). Once you have written or changed the function, you can use the Check Syntax button to verify it, then select OK or Apply to compile and save it. You can also create and save a function template.
TRIGGERS
Triggers are a unique type of procedure. Triggers are very similar to events a type of procedure in certain programming languages such as Visual Basic. Events in Visual Basic are initiated by the system when certain actions occur (for instance, a form is loaded, a text box receives focus, or a key is pressed).
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Figure 9-9.
A function template
Triggers are associated with a table in a database and executed by SQL Server when a specific change occurs in the table. The change could be the result of the following modification statements:
w s v
Insert Update Delete
SQL Server 7.0 and earlier versions recognized only one type of trigger. In SQL Server 2000, this type is called an after trigger. SQL Server 2000 introduces a new type an instead-of trigger. In the following sections, we first examine the standard (after) triggers and then we introduce the new instead-of type.
SQL Server 2000 Stored Procedure Programming
Physical Design
Let s look at the simplified syntax for implementing the core functionality of triggers:
Create Trigger trigger_name On table {For { [Delete] [,] [Insert] [,] [Update] } As sql_statement [...n]
As a stored procedure, a trigger logically consists of
A header, which is a Transact-SQL statement for creating a trigger. It consists of three components:
s s s
The name of the trigger The name of the table with which the trigger will be associated A modification statement (that is, an event) that will initiate the trigger
A body, which contains Transact-SQL statement(s) to be executed at runtime
In the following example, we first create a new table called MyEquipment. We populate it with Make and Model information from the Equipment table, and finally we create a trigger. The trigger is named trMyEquipment_D and is associated with the MyEquipment table. It is fired after a Delete statement is executed against the table. Its function is very simple it notifies the user regarding actions and the number of records that have been deleted.
Create Table MyEquipment (Id int identity, Description varchar(50)) GO -- populate table Insert MyEquipment(Description)
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