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SQL Server 2000 Stored Procedure Programming
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Select @chvScheduleFrequency = ScheduleFrequency From ScheduleFrequency where ScheduleFrequencyId = @inyScheduleFrequencyId select @insDays = CASE @chvScheduleFrequency When 'monthly' then 30 When 'semi-monthly' then 15 When 'bi-weekly' then 14 When 'weekly' then 7 When 'quarterly' then 92 When 'yearly' then 365 END return
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The CASE function/expression works much like a Select statement with nested If statements. In fact, most of the time you can write equivalent code using nested If statements. There are two types of CASE function/expressions:
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Simple CASE function/expressions Searched CASE function/expressions
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A simple CASE function/expression has the following syntax:
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CASE input_expression WHEN when_expression THEN result_expression [...n] [ ELSE else_result_expression ] END
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The previous example used this kind of CASE function/expression. SQL Server attempts to match the input_expression with one of the when_expressions. If it is successful, it returns the result_expression associated with the first matching when_expression. An Else clause is also part of the CASE function/expression. If the value of the input_expression is not equal to either of the when_expressions, the function returns the value of the else_result_expression.
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A searched CASE function/expression is very similar. The only difference is that it does not have an input_expression. The complete criteria are inside the When clause in the form of a Boolean expression:
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CASE WHEN Boolean_expression THEN result_expression [...n] [ ELSE else_result_expression ] END
SQL Server returns the result_expression associated with the first Boolean_expression, which is True. If all Boolean_expressions are false, SQL Server returns the else_result_expression. In the following example, a searched CASE function/expression has to be used because the Boolean_expressions have different operators (= and Like):
Create Procedure prListLeaseInfo -- list all lease contract information As Select LeaseVendor [Lease Vendor], LeaseNumber [Lease Number], CASE -- some vendors have id of sales reps -- incorporated in lease numbers When LeaseVendor = 'Trigon FS' THEN SUBSTRING( LeaseNumber, When LeaseVendor Like 'EB%' THEN SUBSTRING( LeaseNumber, When LeaseVendor Like 'MMEX%' THEN SUBSTRING( LeaseNumber, When LeaseVendor = 'DAFS' THEN SUBSTRING( LeaseNumber, Else 'Unknown' end [Lease Agent], ContractDate [Contract Date] from Lease
5, 12) 9, 8) 7, 6) 8, 11)
TIP: Although both examples use CASE functions/expressions as a part of the Select statement, keep in mind that you can use it anywhere that you can place an expression. This flexibility might come in very handy in some situations.
SQL Server 2000 Stored Procedure Programming
Getting Information About Data You can use numerous functions to return information about data, the most important of which are
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ISDATE ISNUMERIC DATALENGTH SQL_VARIANT_PROPERTY BINARY_CHECKSUM
ISDATE is a function that you can use to determine whether a character value or expression contains a valid date. It is particularly useful when you are forced to read data from text files. If the result of this function is 1 (true), SQL Server guarantees that you will be able to convert the data to date and time datatypes. ISDATE uses the following syntax:
ISDATE(expression)
In the following stored procedure, SQL Server verifies that Lease Data (received as a string) can be converted to a datetime value. It then stores this result with the rest of the parameters in the Lease table:
Create Procedure prLoadLeaseContract -- insert lease contract information and return id of lease @chvLeaseVendor varchar(50), @chvLeaseNumber varchar(50), @chvLeaseDate varchar(50), @intLeaseId int OUTPUT As Declare @intError int -- test validity of date if ISDATE(@chvLeaseDate) = 0 begin Raiserror ("Unable to Convert to date.", 16, 1) return 1
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Functions
end insert into Lease(LeaseVendor, LeaseNumber, ContractDate) values (@chvLeaseVendor, @chvLeaseNumber, Convert(smalldatetime, @chvLeaseDate)) select @intError = @@Error, @intLeaseId = @@identity return @intError
You can use the ISNUMERIC function to determine whether it is possible to convert a character value or expression into one of the numeric datatypes (int, smallint, tinyint, real, float, money, smallmoney, decimal, or numeric). ISNUMERIC uses the following syntax:
ISNUMERIC(expression)
The DATALENGTH function returns the number of bytes used to contain a value. This information is particularly useful when processing character datatypes of variable length.
NOTE: DATALENGTH returns the number of bytes, not the number of characters. For example, each character in the Nvarchar datatype or any of the other Unicode datatypes uses two bytes.
The DATALENGTH function uses the following syntax:
DATALENGTH(expression)
For example, if you assign a string value to a variable, and that value is too long, SQL Server will not report an error. It will simply truncate the value and assign it. The following stored procedure was originally designed without verifying that the list of properties will fit into the output variable. Since SQL Server 2000 and SQL Server 7.0 support data lengths of as much as 8,000 characters using the varchar datatype, it is unlikely that you will exhaust the available storage very often.
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