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Working with different database types
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iBATIS works extremely well in an enterprise database environment. It has a number of features that make it ideal for working with complex database designs and large data sets. iBATIS also works well with multiple databases and does not assume that any type of object is coming from only one database. It also supports complex transactions that require multiple databases to be involved in a single transaction. Furthermore, iBATIS isn t only useful for online transactional systems, but works very well for both implementing reporting and integration systems.
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1.3.3 Proprietary databases
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If you ve been working with software for any length of time, you ve no doubt heard of the build versus buy debate. That is, should we build our own solution to a business problem, or buy a package that claims to solve the problem already. Often the cost is about the same (otherwise there would be no debate), but the real trade-off is between time to implement and the fit to the problem. Custom-built software can be tailored to an exact fit to business need, but takes more time to implement. Packages can be implemented very quickly, but sometimes don t quite meet every need. For that reason, when a choice is made to buy a package, businesses often decide that they can get the best of both worlds by digging into the proprietary database of the software to extend it just for the features that are missing. We could discuss the horror stories of such a scenario, but it s probably better just to know that such proprietary databases were likely not meant to be touched by third parties. The designs are often full of assumptions, limitations, nonstandard data types, and other warning signs that can be easily read as Enter at Your Own Risk. Regardless of the warning signs, businesses will do amazing things to save a few dollars. So software developers get stuck with navigating the jungle that is the proprietary database. iBATIS is an excellent persistence layer for interfacing with proprietary databases. Often such databases allow for read-only access, which you can feel confident about when using iBATIS because you can restrict the kinds of SQL that are run. iBATIS won t perform any magical updates to the database when they aren t expected. If updates are required, proprietary databases are often very picky about how the data is structured. iBATIS allows you to write very specific update statements to deal with that.
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1.3.4 Legacy databases
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If ever there were a bane of a modern object-oriented developer s existence, it would be the legacy database. Legacy databases are generally the prehistoric remains of what was once an enterprise database. They have all of the complexities,
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The iBATIS philosophy
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intricacies, and dependencies of an enterprise database. In addition, they have battle scars from years of modifications, quick fixes, cover-ups, workarounds, bandage solutions, and technical limitations. Furthermore, legacy databases are often implemented on older platforms that are not only outdated but are sometimes totally unsupported. There may not be adequate drivers or tools available for modern developers to work with. iBATIS can still help with legacy databases. As long as there s an appropriate database driver available for the system you re working with, iBATIS will work the same way it does for any database. In fact, iBATIS is probably one of the best persistence frameworks around for dealing with legacy data, because it makes no assumptions about the database design and can therefore deal with even the most nightmarish of legacy designs.
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1.4 How iBATIS handles common database challenges
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On modern software projects databases are often considered legacy components. They have a history of being difficult to work with for both technical and nontechnical reasons. Most developers probably wish that they could simply start over and rebuild the database entirely. If the database is to remain, some developers might just wish that the DBAs responsible for it would take a long walk off a short pier. Both of these cases are impractical and unlikely to ever happen. Believe it or not, databases are usually the way they are for a reason even if the reason isn t a good one. It may be that the change would be too costly or there may be other dependencies barring us from changing it. Regardless of why the database is challenged, we have to learn to work effectively with all databases, even challenged ones. iBATIS was developed mostly in response to databases that had very complex designs or even poor designs. The following sections describe some common database challenges and how iBATIS can help with them.
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