SQL Server 2000 Stored Procedure & XML Programming in .NET framework

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SQL Server 2000 Stored Procedure & XML Programming
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In 9, in the A While Loop with Min() or Max() Functions section, I will demonstrate another method for looping through a set of records using the While statement. Personally, I seldom use cursors; I prefer to use the method demonstrated in 9.
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CHAPTER
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Functions
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IN THIS CHAPTER:
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icrosoft has done a fantastic job providing database administrators and developers with an extensive set of built-in functions for SQL Server. In SQL Server 2000, you are now also able to create your own functions. We will cover the design of user-defined functions in detail in 8 and focus here on the uses and attributes of built-in functions.
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Using Functions
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Functions are Transact-SQL elements that are used to evaluate zero or more input parameters and return data to the caller. The syntax for calling a function is
Function_name ([parameter] [,...n])
For example, the Sin() function has the following syntax:
Sin(float_expression)
So, to display the sine of 45 degrees, you would use:
SELECT Sin(45)
Some functions accept more than one parameter, and some do not require parameters at all. For example, the GetDate() function, which returns the current date and time on the system clock to the caller, accepts no parameters. We will use the GetDate() function to illustrate the most common ways to use functions in Transact-SQL.
In Selection and Assignment
Functions can be used to represent a value or a part of a value to be assigned or selected in a Set or Select statement. In the following example, two variables are populated using values stored in the selected record and a third variable is populated using a function:
Select @chvMake = Make, @Model = Model, @dtsCurrentDate = GetDate() from Equipment where EquipmentID = @intEqId
As previously noted, this use is not limited to the Select statement. Values can be assigned in the Set statement, displayed in the Print statement, stored in a table using Update and Insert, or even used as parameters for other functions:
5: Functions
Create Procedure prInsertNewSchedule @intLeaseId int, @intLeaseFrequencyId int As Insert LeaseSchedule(LeaseId, StartDate, EndDate, LeaseFrequencyId) Values (@intLeaseId, GetDate(), DateAdd(Year, 3, GetDate()), @intLeaseFrequencyId) return @@Error
This procedure inserts the current date using the GetDate() function in the StartDate column. The EndDate column is calculated using the DateAdd() function, which accepts the GetDate() function as one parameter. It is used to set the end date three years from the current date. This was just an example of the usage of functions. You will be able to see more details about GetDate() and DateAdd() in the Date and Time Functions section of this chapter.
As Part of the Selection Criteria
Functions are often used in the Where clause of Transact-SQL statements:
SELECT Inventory.InventoryId FROM LeaseSchedule INNER JOIN Inventory ON LeaseSchedule.ScheduleId = Inventory.LeaseScheduleId WHERE (LeaseSchedule.EndDate < GetDate()) AND (Inventory.Rent <> 0)
This Select statement selects the lease schedules that have reached the end of the term by comparing the EndDate to the current date.
In Expressions
You can also use functions anywhere you can use an expression, such as in an If statement, which requires a Boolean expression to determine further execution steps:
If @dtmLeaseEndDate < GetDate() Begin ... end
SQL Server 2000 Stored Procedure & XML Programming
As Check and Default Constraints
Functions can also be used to define Check and Default constraints:
ALTER TABLE [dbo].[Order] ( [OrderId] [int] IDENTITY (1, 1) NOT null , [OrderDate] [smalldatetime] NOT null , [RequestedById] [int] NOT null , [TargetDate] [smalldatetime] NOT null , [CompletionDate] [smalldatetime] null , [DestinationLocationId] [int] null ) ON [PRIMARY] GO ALTER TABLE [dbo].[Order] WITH NOCHECK ADD CONSTRAINT [DF_Order_OrderDate] DEFAULT (GetDate()) FOR [OrderDate], CONSTRAINT [PK_Order] PRIMARY KEY CLUSTERED ( [OrderId] ) ON [PRIMARY] GO
In this case, the Order table will automatically set the OrderDate field to the current date if a value is not supplied.
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