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For every report writer, familiarity with the location of the data in a given database can come only with time. Of course, having a database diagram or schema provided by a vendor is a useful tool, and we have the luxury of that here, but this isn t always available. One day, faced with the dilemma of trying to find the right table for a specific piece of missing data, we decided to put together a stored procedure, which we named sp_FieldInfo. It returns a list of all the tables in a specific database that contains the same field names, typically the primary or foreign key fields. For example, in the health-care database, if you wanted a list of fields that contained the PatID field (the patient s ID number that s used to join several tables), you would use the following command:

want to consider using color coding for each cable that corresponds to its purpose For example, all network cables will be blue, all crossover cables yellow, and so on If a single cable needs to be replaced for some reason or is knocked loose, one of both of these methods will make it easy to identify them Install phone lines in the data center itself: Whether it is your employees needing to talk to someone internally, or a third-party vendor needing to call some people while he or she is in the data center, you need a phone installed Although it is arguably outdated, you may also want to consider standard analog phone lines in addition to a digital phone system in case the digital phone system fails; this would enable modems in servers or laptops to dial out of the data center.

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When you are using Spring, you can access EJB resources without needing to perform an explicit lookup. Spring can act as an adapter between lookup- and injection-style IoC systems, thus allowing you to manage all resources using injection.

For the ber-paranoid, install a pay phone or locate your data center near one Pay phones operate on completely separate circuits that almost always stay up during emergencies Have backup communications systems in place: In the event of a power outage or another type of emergency where phone systems may be down, make sure you can communicate Whether you use walkie-talkies, pagers, or some other device that meets your needs, do not assume that your primary communication system will always be working For example, if you only have one phone in the data center and there is no cellular phone reception, you may have an inability to solve your crisis and keep management informed If you have redundant communications, your coworker can be talking on one line on a phone to tech support while you are on another line talking to management.

The real question is this: given the choice, which method should you use, injection or lookup The answer to this is most definitely injection If you look at the code in Listings 3-4 and 3-5, you can clearly see that using injection has zero impact on your components code The dependency pull code, on the other hand, must actively obtain a reference to the registry and interact with it to obtain the dependencies; using CDL requires your classes to implement a specific interface and look up all dependencies programatically When you are using injection, the most your classes have to do is allow dependencies to be injected using either constructors or setters Using injection, you are free to use your classes completely decoupled from the IoC container, manually supplying dependent objects with their collaborators, whereas with lookup, your classes are always dependent on classes and interfaces defined by the container.

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