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CHAPTER 8 DATABASE INTEGRATION
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Planning the Database Tasks
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Based on the above discussion, there are a few tasks we can provide as building blocks for database integration. Table 8-1 lists these tasks. Table 8-1. Required Database Tasks
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Control Analyze Integrate Configure
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Adding new migration scripts to the source control database Assessing the database for changes and providing automated migration scripts Running migration scripts on a particular database instance Ensuring that the tested/deployed code runs on the required database instance
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With those tasks (or suites of tasks), we should be able to handle our requirements for database integration. The Analyze step is a special case and goes further than in our original discussion. We had planned to work with scripts provided by developers and integrate using these scripts, but there are also possibilities for the automation of the migration itself. This will be the icing on the cake for database integration. Let us consider this list in a little more detail, and then examine the impact on the delivery process.
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Control Task
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This task should provide the facilities to add new migration scripts to source control in an ordered manner to ensure that the database development and migration path is complete and auditable. In fact, this task does not need to actually use source control, as long as it manages the assets in a way acceptable for configuration management, although this may well be under source control. We manage code assets in VSS, but manage the compiled code in zip files stored (and backed up!) on the CCNet server. We could do the same thing with the database assets, bypassing the source control database, though it is preferable to maintain the assets under source control because they cannot be regenerated in the same way that compiled assemblies can. We need to decide what scripts are required, and what to do with these scripts during an integration cycle. This is not as easy as it might first sound. Do we want to simply maintain ALTER scripts Perhaps we want to take a full CREATE script following a successful set of tests. We may want to do the same with the test data as well. Do we remove the migration scripts following a successful build (so that they cannot be changed) If the build fails, do we want to leave them so that they can be changed
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CHAPTER 8 DATABASE INTEGRATION
Analyze Task
Providing automated database integration in terms of the actual migration scripts would be a huge boon; it significantly reduces the risk of developers failing to manage the scripts accurately and thus introducing build problems. Doing this is a complex business, though. There are two potential areas to analyze: the scripts defining the database structure, and the scripts defining the data. The database structure scripts are a good target initially since there are no semantic issues to deal with. Handling data migration and updates automatically could be a real headache and may ultimately be handled best manually. For this task we will utilize a third-party tool.
Integrate Task
Integration itself should be quite straightforward as long as the scripts are available. This step will involve looking at the scripts available and applying them in the correct order to the correct environment. Ultimately, though, this should just be a case of running multiple script processing tasks.
Configure Task
This task ensures that unit tests are carried out against the correct database instance and that when the system is deployed, the correct application instance points at the correct database instance. There are a few ways that this kind of work can be achieved that are also applicable to other configuration settings: the generation of configuration files on the fly, replacing individual configuration elements, or pointing the master configuration file to child configuration files from instance to instance and environment to environment.
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