5: Functions in VS .NET

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5: Functions
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where UserName = @chvUserName -- if you cannot identify user report an error If @intRequestedById = null begin Raiserror('Unable to identify user in Contact table!', 1, 2) return 1 end -- and finally create Order Insert into [Order](OrderDate, RequestedById, TargetDate, DestinationLocationId, Note) Values (@dtmOrderDate, @intRequestedById, @dtmTargetDate, @intDestinationLocation, @chvNote) set @intOrderid = @@identity return 0
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Functions for Handling Identity Values Identity columns are used in SQL Server tables to automatically generate unique identifiers for each record. Numbers that are generated in this manner are based on two values identity seed and identity increment. SQL Server starts assigning identity values from an identity seed, and every row is given a value that is greater than the previous one by the value specified in the identity increment (or less than that value if you use a negative increment value). In 4, we covered the use of the @@identity function/global variable. It returns the last value generated by SQL Server while inserting record(s) into the table with an identity value:
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Declare @intEqId int Insert into Equipment(Make, Model, EqTypeId) Values ('ACME', 'Turbo', 2) Select @intEqId = @@identity Select @intEqId [EqId]
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The Ident_Seed() and Ident_Incr() functions return to the user the values of the seed and the increment for the selected table or view:
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Select IDENT_SEED('Inventory'), IDENT_INCR('Inventory')
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The Identity() function allows a user to generate identity values while using the Select Into command. Let me remind you that this command selects records and immediately inserts them into a new table. Without it, you would be forced to create
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a new table with an identity column and then insert the selected records into the table. With it, everything can be achieved in one step:
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Identity(int, 1,1) AS ID, Property.Property, InventoryProperty.Value, Property.Unit INTO #InventoryProperty FROM InventoryProperty INNER JOIN Property ON InventoryProperty.PropertyId = Property.PropertyId WHERE (InventoryProperty.InventoryId = 12) SELECT
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Ident_Current() returns the last identity value set for a specified table (in any scope of any process). To use it, just supply the table name as a parameter:
Select Ident_Current('Equipment')
The Scope_Identity() function, new with SQL Server 2000, returns the last identity value generated in the scope of the current process. We will discuss in detail usage of the Scope_Identity() function and the problems it solves in the Using Identity Values section of 9.
Date and Time Functions
The following set of functions is designed to process data and time values and expressions. Get (Current) Date GetDate() is the function that you will probably use more often than any other date and time function. It will return the system time in datetime format. We have already demonstrated the use of this function in the first section of this chapter, Using Functions. GetUtcDate() is the function that returns the date and time for the Greenwich time zone, also known as Universal Time Coordinate (UTC). Extracting Parts of Date and Time From time to time, you will need to extract just one component of the date and time value. The basic functionality necessary to achieve this end is implemented in the following three functions:
DAY(date) MONTH(date) YEAR(date)
5: Functions
These functions require expressions of the datetime or smalldatetime data type, and they all return the corresponding integer value. The DatePart() and DateName() functions provide similar functionality, but they are more flexible:
DatePart(datepart, date) DateName(datepart, date)
The user can specify which component of the date to obtain by supplying a datepart constant from Table 5-2 (you can use either the full name or the abbreviation). DatePart() then returns the value of the datepart, and DateName() returns the string that contains the appropriate name. Naturally, DateName() is not meaningful in some cases (for example, year, second) and SQL Server will return the same value as it would for DatePart(). The following Select statement shows how can you use data functions:
SELECT GetDate()'Date', DateName(month, GetDate()) AS 'Month Name', DatePart(yyyy, GetDate()) AS 'Year'
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