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CHAPTER 8 DATABASE INTEGRATION
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DoAlterScripts is a little more involved. It loops through the target databases, creating new Database types for each and then again calculating the scripts and writing them (with the name format ALTER-<database>-<caption>) if necessary. Additionally, once the script is calculated it is executed on the target database, providing the required synchronization. Both of these methods use the common methods described next for script calculation, execution, and writing. Where DoAlterScripts passes a target database to the CalculateScript method, DoCreateScript passes a null to the method. This feature of the APIs forces a full migration script effectively a CREATE script to be produced and so is ideal for scripting the full database schema. Both scripts also dispose of the blocks generated, as per the API standards. If you look at the examples provided with the bundle, you will see that the code is similar in terms of the actual work being done. The three remaining methods look like this: private ExecutionBlock CalculateScript(Database target) { Differences differences = _source.CompareWith(target, Options.Default); foreach (Difference difference in differences) { difference.Selected=true; } Work work=new Work(); work.BuildFromDifferences(differences, Options.Default, true); return work.ExecutionBlock; } private void ExecuteScript(ExecutionBlock script, Database target) { Utils utils = new Utils(); //This is a RedGate Utils Class utils.ExecuteBlock(script, target.ConnectionProperties.ServerName, target.ConnectionProperties.DatabaseName, target.ConnectionProperties.IntegratedSecurity, target.ConnectionProperties.UserName, target.ConnectionProperties.Password); } private void WriteScript(string caption, string content) { Log(Level.Info, String.Format("Writing script {0}", caption)); FileStream script = new FileStream(Path.Combine(this._folder.FullName, caption), FileMode.Create); StreamWriter sw = new StreamWriter(script); sw.Write(content); sw.Close(); script.Close(); }
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CHAPTER 8 DATABASE INTEGRATION
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Note Ah, the pleasure of third-party APIs. With my nitpicking hat on, I would say that it would be very
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useful if there were a few changes such as a method differences.SelectAll to save looping through the collection, and it would be nice if ExecuteBlock could accept a Database type instead of the individual connection information. Grumble, grumble.
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I have not included much in the way of feedback in the task. It would probably be sensible to include some suitable debugging logging statements, such as writing out the SQL to the NAnt logger and so on. With that, the job is done. In order to test the task we can create a simple scenario with multiple databases to run the automatic integration. Let us use the same trivial example as before the useless Users table and set up the databases as shown in Table 8-3. Table 8-3. Test Databases
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The full Users table, with the PostCode column The Users table without the PostCode column The Users table without the PostCode column
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We can verify that the databases are not equal by using SQL Compare. We will use the NAnt task to generate the full script for TestDB-Development, and then to script and synchronize the two testing databases. This looks as follows: < xml version="1.0" > <project> <loadtasks assembly="Etomic.NAntExtensions.RedGateDBTasks.dll"/> <dbAutoIntegrate folder="D:\BookCode\8\DBTest2\" server="localhost" database="TestDB-Development" uid="sa" pwd="w1bbl3" write="true" caption="0" > <databases> <database server="localhost" database="TestDB-Integration" uid="sa" pwd="w1bbl3" write="true"/> <database server="localhost" database="TestDB-System" uid="sa" pwd="w1bbl3" write="true"/> </databases> </dbAutoIntegrate> </project>
CHAPTER 8 DATABASE INTEGRATION
Because this is a debug script, I am passing 0 as the caption. Running the script produces the results shown here.
Note Bear in mind that if you are using the unlicensed version of SQL Compare, then a nag screen
will be shown. This precludes the use of the task in an automated environment because of the interactive nagging.
---------- NAnt (RedGate) ---------NAnt 0.85 Copyright (C) 2001-2005 Gerry Shaw http://nant.sourceforge.net Buildfile: file:/// AntExtensions.RedGateDBTasks.Debug.xml Target framework: Microsoft .NET Framework 1.1 [loadtasks] Scanning assembly "Etomic.NAntExtensions.RedGateDBTasks" for extensions. [dbAutoIntegrate] Handling CREATE Script [dbAutoIntegrate] Writing script CREATE-0.sql [dbAutoIntegrate] Handling migration for TestDB-Integration [dbAutoIntegrate] Writing script ALTER-TestDB-Integration-0.sql [dbAutoIntegrate] Handling migration for TestDB-System [dbAutoIntegrate] Writing script ALTER-TestDB-System-0.sql BUILD SUCCEEDED Total time: 6.5 seconds. Output completed (7 sec consumed) - Normal Termination The output is as we would expect. If we look into the output folder, we will find the scripts shown in Figure 8-12.
Figure 8-12. Output from the <dbAutoIntegrate> task These scripts contain the output we would expect from running SQL Compare manually to perform the same actions. Performing a diff on the two synchronization scripts demonstrates that they are the same. Running the CREATE script in a new database and then performing a SQL Compare on the databases will demonstrate that they are the same too. With that, our database schema synchronization woes are banished on a practical level. We can consider some process implications a little later.
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