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The Impact on Continuous Integration
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We need to thread the database migration tasks into the regular process. Figure 8-3 demonstrates how the process looks with the new task inserted. The diagram demonstrates the opportunity for us to include database integration after the compile and testing steps of the regular process. As we will see, the database integration step will consist of some substeps itself, but for now we should recognize that post-testing of the code is the preferred time for the database work. The reasons for this relate to the nature of database integration: it is to a certain extent a one-way process rollback is at least painful because of the lack of natural support for this sort of operation on a database platform. We will see this demonstrated later.
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CHAPTER 8 DATABASE INTEGRATION
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Figure 8-3. CI process with database integration
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CHAPTER 8 DATABASE INTEGRATION
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Implementing the Database Tasks
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In order to implement the database tasks, we must use a combination of existing NAnt tasks, new custom tasks (or some clever <exec> tasks) and the aforementioned third-party tool to handle automated database integration. We will tackle the Analyze and Integrate tasks initially, then concern ourselves with source control and configuration issues after we have handled the guts of the work. In looking at the Analyze and Integrate tasks, we will effectively be looking at two differing solutions: one for manual scripts and one for automated scripts for the database integration. We will consider the task for processing manually generated SQL scripts first.
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Manual SQL Script Processing Task
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So, as discussed earlier, the manual integration task needs to be able to look at a series of migration scripts and execute them in the correct order on a designated target database. Therefore, in order to use this task, we need something like the following information: the folder where the database scripts are, the correct ordering of the scripts, and the database details (server, database name, user and password credentials). This means that the following NAnt script could do the job quite nicely: <dbIntegrate folder="D:\BookCode\8\DBTest1\" compare="CreationTime" server="localhost" database="TestDB-Integration" uid="sa" pwd="w1bbl3" /> Of course, this task does not currently exist. We need to generate the code for this task, but we are used to this now from our work on the <fxcop> task in 7.
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Note As usual, the code for this task can be found in the VSS database.
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The code for the integration is actually quite simple. The project for this particular task looks like the one shown in Figure 8-4.
CHAPTER 8 DATABASE INTEGRATION
Figure 8-4. ManualDBTasks project
Note The code for this chapter could be included as part of the previous NAntExtensions solution, but I
have separated the projects for clarity.
The code for all six XML attributes is broadly the same and is quite simple. I could have used a fileset for the script folder(s), but this would confuse the ordering of the scripts and is probably not the desired scenario. private DirectoryInfo _folder; private string _compareOption; //Database Info private string _server; private string _database; private string _username; private string _password; [TaskAttribute("folder", Required=true)] public DirectoryInfo Folder { get{return _folder;} set{_folder = value;} } /// <summary> /// Available options "Name", "LastWriteTime", "CreationTime" /// </summary> [TaskAttribute("compare", Required=true)] public string CompareOption
CHAPTER 8 DATABASE INTEGRATION
{ get{return _compareOption;} set{_compareOption = value;} } [TaskAttribute("server", Required=true)] public string Server { get{return _server;} set{_server = value;} } [TaskAttribute("database", Required=true)] public string Database { get{return _database;} set{_database = value;} } [TaskAttribute("uid", Required=true)] public string Username { get{return _username;} set{_username = value;} } [TaskAttribute("pwd", Required=true)] public string Password { get{return _password;} set{_password = value;} } The key points to notice about the previous code is the use of a DirectoryInfo type for the folder, which NAnt can handle automatically, and the available options for the Compare Option. These are not particularly friendly ways of describing the sorting options for the folder, but are in fact the way that the .NET Framework describes the options. Since we will be using a reflective comparer, it is easier to use the default names. The three options mentioned (Name, LastWriteTime, CreationTime) are not exhaustive but are the most likely ordering to be needed for our purposes (more complete code should limit these options, of course).
Note The code for the comparer is held in the ObjectComparer.cs file. This is a useful general-purpose
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