Testing Stored Procedures in .NET

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Testing Stored Procedures
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There may be times when you re required to test stored procedures During development, this is easy enough You simply execute them within a query window in SSMS For serious problems in the logic, you may want to use a debugger If you re coming from a SQL Server 2000 background, you probably know that stored procedures previously could be debugged in the Query Analyzer However, in
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9: Stored Procedures
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SQL Server 2005, there is no Query Analyzer Instead, query windows can be created right in the SSMS environment This might lead you to believe we must be able to debug stored procedures within SSMS I ve hunted for it It s not there Instead, to debug stored procedures you need to use Visual Studio s development environment The actual procedure of debugging a stored procedure is beyond the scope of this book; however, I did want to mention that it could be debugged in Visual Studio, not SSMS One of the problems you may be faced with is testing the stored procedures after an upgrade This could be after a major upgrade of the entire server from SQL Server 2000 to SQL Server 2005, or a minor upgrade such as a service pack In this situation, the use of test scripts is often the best solution EXAM TIP If tasked with testing stored procedures after an upgrade, consider the use of test scripts Test scripts can easily control the input and test for a predicted output By using test scripts to test your stored procedures, you can control the input parameters and predict the stored procedure output
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While the previous exercises help you get your hands on both stored procedures and functions, you may like to see something useful on the job We explored DBCC CheckDB in 7 It can be used to check the integrity of a database and all the objects in that database In the following exercise, we ll create a stored procedure that will run DBCC CheckDB on all of our databases Exercise 97: Create a Stored Procedure to Check Database Integrity 1 Open a New Query window in SSMS 2 Execute the following script to check the health of the AdventureWorks database This script takes about 20 or more seconds to run
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USE AdventureWorks; GO DBCC CHECKDB;
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3 As part of a maintenance plan, you may choose to create stored procedures that you will use on a regular basis Instead of creating these in user databases or system databases, it s considered a best practice to create these objects in your own database Create a database named Dba to hold your database administrator objects using the following script:
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Use Master; GO CREATE DATABASE Dba;
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MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
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4 Execute the following script to identify how many databases you have in your system:
SELECT MAX(dbid) FROM masterdbosysdatabases;
We can use this statement embedded into a script instead of the actual number of databases 5 What we need to do is run DBCC CHECKDB on each database However, there could easily be too many to do manually By creating a script, we can automate it Enter the following script to build the DBCC CHECKDB statement for each database:
--Declare variables DECLARE @dbid integer; --Current database DECLARE @DBName nvarchar(50); --Database name DECLARE @mySQL nvarchar(200); --SQL Statement --Start with first database SET @dbid = 1; --Loop through all databases WHILE @dbid < (SELECT MAX(dbid) FROM masterdbosysdatabases) BEGIN SELECT @DBName = name FROM masterdbosysdatabases WHERE dbid = @dbid; --Dynamically build statement to execute for each database SET @mySQL = 'DBCC CHECKDB(' + @DBName + ')'; --Show dynamically built SQL statement SELECT 'Statement = ' + @mySQL AS 'Dynamically Built T-SQL Statement'; --Increment database to do the same for the next database Set @dbid = @dbid + 1; END;
When you run this script, notice that the SELECT statement that is output just shows us what the dynamically built statement looks like It doesn t run it Also notice that we re using the + to concatenate the string DBCC CHECKDB( with the actual name of the database pulled from the SELECT statement 6 Add the EXEC line (in bold next) after the SELECT statement:
SELECT 'Statement = ' + @mySQL AS 'Dynamically Built T-SQL Statement'; EXEC sp_executesql @statement = @mySQL
7 Execute the modified script This will take a while Afterward, you should see a result set similar to Figure 9-14
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