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Placing common code in the tools database
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Common code is code that typically can be written and consumed only one way. Converting from Celsius to Fahrenheit, converting from miles to kilometers, and calculating sales tax are some examples. Let s look at a sales tax calculation example; each state will have a current tax rate and a previous tax rate in a table. The row where the EndDate is NULL is the current tax rate; the row where the EndDate isn t NULL is a previous tax rate. When we add a new tax rate, we simply update the row where the EndDate column has a NULL value with the current date and insert a new row with a NULL value for the EndDate. Create the StateTaxRates table in listing 11 and insert four rows for state tax rates.
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Listing 11 Table for state tax rates
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CREATE TABLE StateTaxRates(StateCode char(2) NOT NULL, StartDate datetime NOT NULL, EndDate datetime, TaxRate decimal(4,4) NOT NULL) GO INSERT INSERT INSERT INSERT StateTaxRates StateTaxRates StateTaxRates StateTaxRates VALUES('NJ','20010101','20070101',.07) VALUES('NJ','20070102',NULL,.08) VALUES('CA','20010101','20080101',.0825) VALUES('CA','20080102',NULL,0.09)
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The user-defined function that calculates the tax is shown in listing 12.
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Listing 12 User-defined function to calculate tax
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CREATE FUNCTION CalculateStateTax(@Value decimal(20,8),@StateCode char(2),@Date datetime) RETURNS decimal(20,4) AS BEGIN DECLARE @TaxRate decimal(4,4) --Grab latest tax rate IF @Date IS NULL BEGIN SELECT @TaxRate = TaxRate FROM StateTaxRates WHERE StateCode = @StateCode AND EndDate IS NULL END ELSE --Grab tax rate for a specific day BEGIN SELECT @TaxRate = TaxRate FROM StateTaxRates
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Formatting
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WHERE StateCode = @StateCode AND @Date >= StartDate AND @Date < EndDate END --Do the calculation by multiplying the tax with the amount RETURN @Value * @TaxRate END GO
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Four example calls and their results are shown in listing 13.
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Listing 13 Four example calls and their results
SELECT dbo.CalculateStateTax(100,'NJ',null) (Result set) 8.0000 SELECT dbo.CalculateStateTax(100,'NJ','20020101') (Result set) 7.0000 SELECT dbo.CalculateStateTax(10000,'CA',null) (Result set) 900.0000 SELECT dbo.CalculateStateTax(100000,'CA','20020101') (Result set) 8250.0000
Formatting
In general, formatting should be done in the presentation layer, but sometimes you need to generate a file and the recipient needs certain values to be in a specific format. Take a date for example; what if you want a date in the format YYYY-MM-DD SQL Server has a bunch of formats built in, but it doesn t have that one. Create the function in listing 14.
Listing 14 Function to format a date
CREATE FUNCTION FormatDateDash(@Date datetime) RETURNS varchar(10) AS BEGIN RETURN CONVERT(varchar(10),@Date,120) END GO
Now call it like this:
SELECT dbo.FormatDateDash(getdate()),dbo.FormatDateDash('20010101') (Result set) 2008-10-29 2001-01-01
Why every SQL developer needs a tools database
Calling code from a different database
In order to call code that resides in a different database, you ll need to use three-part notation. Three-part notation looks like this:
DatabaseName.Schema.Object
A stored procedure named SplitString exists in the tools database within the dbo schema. In order to execute this stored procedure from the temp database, your code would look like this:
USE tempdb GO EXEC Tools.dbo.SplitString 'Z|X|A', '|' GO
You need to have appropriate permissions in order to call objects in a database from another database!
Summary
Hopefully this chapter has given you an idea of how a tools database can help you save time and headaches. Next time when you have to make code changes in several places to fix a bug or make a change request, consider a tools database: it ll make your life easier.
About the author
Denis Gobo resides in Princeton, New Jersey, with his wife and three kids. For the last four years, Denis has been working for Dow Jones, where his task is to optimize the storage and retrieval of a good amount of data; most of this data is stored in SQL Server. Denis is a cofounder of http://lessthandot.com, a community site for tech professionals, where he also blogs and answers questions in the forums. In his free time, Denis likes to read, watch horror movies, and spend time with his family.
21 Deprecation feature
Cristian Lefter
With every release of SQL Server, new features are added. Also, some features are discontinued or marked as deprecated, which means that they ll be removed in a future version of SQL Server. Starting with SQL Server 2008, the deprecation policy is taken very seriously. How seriously Seriously enough to mention that the first public CTP of the product came with a feature that allows you to monitor usage of deprecated functionality. You may ask yourself: why would I need to track the usage of deprecated features Among the possible reasons are the following two: You can obtain greater longevity for an application if you re an application developer. You can identify possible upgrade problems for your existing applications before the next release of SQL Server hits the shops. The deprecation feature consists of two components: The SQLServer:Deprecated Features object performance counter. The Deprecation category of trace events, including the Deprecation Announcement event class (indicates that a feature will be removed in a future version of SQL Server) and the Deprecation Final Support event class (indicates that a feature will be removed in the next major release of SQL Server). The complete list of deprecated features can be found in Books Online and has more than nine printed pages. Table 1 displays a few of them.
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