5: Advanced Database Objects in Visual Studio .NET

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5: Advanced Database Objects
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193 Prefixing User-defined Stored Procedures with usp
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Many programming objects use prefixes to define what they are For example, views are frequently named with a prefix of vw_ A logical prefix for a stored procedure is sp_ However, system stored procedures have already taken this prefix A best practice is to use a different prefix for stored procedures For example, many DBAs use the prefix of usp_ for user-defined stored procedures xp_ is the prefix for extended stored procedures, which are still supported in SQL Server 2005, but have been deprecated
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Or, if you want to simplify the example, you don t have to use the AdventureWorks database at all Change your query to:
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SELECT DATEADD(day, 21, '11/03/2007');
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Execute this and you see that it returns a date of 11/24/2007, adding 21 days to the given date We ll expand both the modified BOL example and the simple example that is not using AdventureWorks in the following steps 3 Create a stored procedure (without any parameters) using the function Now we simply wrap the SELECT statement within the required syntax to create a stored procedure Notice the bolded text is all we need to add to create two new stored procedures
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USE AdventureWorks; GO CREATE Proc dbousp_AddDaysExample1 AS SELECT OrderDate, DATEADD(day, 21, OrderDate)AS TimeFrame FROM SalesSalesOrderHeader; GO CREATE Proc dbousp_AddDaysExample2 AS SELECT DATEADD(day, 21, '11/03/2007');
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4 Execute the stored procedure to make sure it works
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EXEC usp_AddDaysExample1; EXEC usp_AddDaysExample2;
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TIP Note that the default schema is dbo We don t have to execute it as dbousp_AddDays, but if it were defined with a different schema, we would need the two-part name
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MCITP SQL Server 2005 Database Administration All-in-One Exam Guide
5 Alter the stored procedure to accept an input parameter Next we ll use the DDL ALTER statement to modify the structure of the stored procedure to accept an input Again the bolded text is all we need to modify to accomplish the task Since the stored procedure exists, we use ALTER instead of CREATE Next we add the input parameter definition, and last we change the literal date to the defined input parameter:
USE AdventureWorks; GO --This will add a variable number of days to the OrderDate ALTER Proc dbousp_AddDaysExample1 @InputDays integer AS SELECT OrderDate, DATEADD(day, @InputDays, OrderDate)AS TimeFrame FROM SalesSalesOrderHeader; GO --This will add 21 days to a given date ALTER Proc dbousp_AddDaysExample2 @InputDate datetime AS SELECT DATEADD(day, 21, @InputDate);
6 Execute the altered stored procedure to make sure it works In the first example, we are passing in the number 21 to add 21 days to the OrderDate In the second example, we are passing in the date Notice our stored procedures are now flexible enough to accept any number of days for the first stored procedure, or any date for the second one:
EXEC usp_AddDaysExample1 12; EXEC usp_AddDaysExample2 '12/03/2007';
7 Tweak as desired We ll just modify the second example Instead of always adding 21 days, you can give the user the option of entering the number of days You can do this by adding another input parameter and using it Notice that we add a comma after the first parameter
USE AdventureWorks; GO --This will add a variable number of days to a given date ALTER Proc dbousp_AddDaysExample2 @InputNumberofDays int, @InputDate datetime AS SELECT DATEADD(day, @InputNumberofDays, @InputDate);
Execute the new procedure:
EXEC usp_AddDaysExample2 30,'11/03/2007';
Notice that with more than one parameter, we have to either enter the parameters in order as we did earlier or identify the parameters with an = operator This would not work as desired if we entered it as:
EXEC usp_ AddDaysExample2 '11/03/2006', 30;
5: Advanced Database Objects
The stored procedure would try to interpret the date ('11/03/2006') as a number of days (an integer) and the number 30 as a date However, we could do it this way:
EXEC usp_AddDaysExample2 @InputDate = '11/03/2007', @InputNumberofDays = 30;
Now that you ve done this with one DateTime function, repeat it with the next DateTime function, and then with the rest of the DateTime functions And then the Aggregate functions And then the String functions And then well, you get the idea Here s a warning, though What I often notice students in the classroom trying to do is to skip steps 1 through 6 and start with creating a fancy tweaked stored procedure It doesn t work and they re faced with trying to debug all 7 steps at the same time They get frustrated and quit After you ve done a couple dozen stored procedures, you probably will be able to jump right to step 7, but for a while, take your time and go through all the steps one at a time As you succeed with each step, count it as a mini-victory, yell out Wooo Hooo! and move on to the next step
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