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The following stored procedure uses the SYSTEM_USER function to identify the person adding an order to the system:
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Create Procedure prAddOrder -- insert Order record @dtmOrderDate datetime = null, @dtmTargetDate datetime = NULL, @chvUserName varchar(128) = NULL, @intDestinationLocation int, @chvNote varchar(200), @intOrderid int OUTPUT As declare @intRequestedById int
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-- If user didn't specify order date -- default is today. if @dtmOrderDate = NULL Set @dtmOrderDate = GETDATE() -- If user didn't specify target date
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-- default is 3 days after request date. if @dtmTargetDate = NULL Set @dtmTargetDate = DATEADD(day, 3, @dtmOrderDate) -- if user didn't identify himself -- try to identify him using login name if @chvUserName = null Set @chvUserName = SYSTEM_USER -- get Id of the user select @intRequestedById = ContactId from Contact where UserName = @chvUserName -- if you can not 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, @intDestinationLocation, set @intOrderid = @@identity return 0 Note) Values (@dtmOrderDate, @intRequestedById, @dtmTargetDate, @chvNote)
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Functions for Handling Identity Values Identity columns are used in SQL Server tables to generate unique identifiers for each record automatically. 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).
SQL Server 2000 Stored Procedure Programming
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:
Declare @intEqId int Insert into Equipment(Make, Model, EqTypeId) Values ('ACME', 'Turbo', 2) Select @intEqId = @@identity
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:
Select IDENT_SEED('Inventory'), IDENT_INCR('Inventory')
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, developers are forced to create 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:
SELECT 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)
Date and Time Functions
This 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 is designed to 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.
5:
Functions
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)
These functions require expressions of the datetime or smalldatetime datatype, 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 Full
Datepart Abbreviation
Millisecond Second Minute Hour weekday Week dayofyear Day Month Quarter Year Table 5-2.
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