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Relationships are represented by data in tables. To establish a relationship between two tables, you need to have data in one table that enables you to find a row or rows in another table. That s where keys come in, specifically primary and foreign keys.

and provide you an interface so you can literally search all the mailing lists that are relevant to your particular Pylons installation. If you can t find your error on the mailing lists, you can go to the next tab, Post Traceback, and submit your stacktrace to a webservice on PylonsHQ.com so that you can try to debug your problems online with other collaborators. Combining unit tests, functional tests, and the myriad of debugging options afforded to you in the web debugger, Pylons makes the debugging experience as painless as possible.

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A primary key is a column or combination of columns whose values uniquely identify rows in a table. No column of a primary key can be null. Let s take a closer look at the Employees table in the Northwind database (see Figure 10-11). The first column is EmployeeID. It s marked as PK (primary key) and not null. EmployeeID uniquely identifies each employee (i.e., each row in Employees). In fact, it s the only column that does so and it doesn t need to be combined with any other columns to do it. For example, the LastName column, even though it s not null, can t be the primary key since more than one employee could have the same last name.

Deploying your pylons application into a servlet container is very straight forward. Just install snakefight from PyPI using easy_install and you can start building WAR files. Listing 15-28. $ easy_install snakefight ...snakefight will download and install here ... $ jython setup.py bdist_war --paste-config test.ini By default, snakefight will bundle a complete instance of your Jython installation into the WAR file. What it doesn t include is any JAR files that your application depends on. For our small example, this is just the postgresql JDBC driver. You can use the --include-jars options and provide a comma separated list of JAR files. Listing 15-29. $ jython setup.py bdist_war \ --include-jars=postgresql-8.3-604.jdbc4.jar \ --paste-config=test.ini The final WAR file will be located under the dist directory. It will contain your postgreql JDBC driver, a complete installation of Jython including anything located in site-packages and your application. Your war file should deploy without any issues into any standards compliant servlet container.

Although a Spring application can in principle be configured in any number of different ways, XML configuration files are by far the most common approach. Indeed, for most developers, the set of XML files used to configure the factory for a Spring project and the BeanFactory instance itself are virtually synonymous. The XML is the representation of the factory that will be available to you at runtime, so this is not a bad way of thinking of them, but do bear in mind that it is a useful approximation to the reality of the situation. Ultimately, we need to use a language of some sort to configure our dependencies. Traditionally, this has been the Java programming language itself, occasionally resorting to properties files when the problems of tight coupling became too painful. XML files offer us a better balance of flexibility, readability, verbosity, and expressiveness. Something to remember in particular is that there is no 1:1 correspondence between factories and XML files. It is entirely possible (and normal) to use multiple files to configure a single factory, or to use a single file to instantiate several discrete factories (though this is unusual). Listing 3-6 represents the same configuration information that we painstakingly hardcoded in Listing 3-5 of the previous section.

Details table has a composite (composed of more than one column) primary key, because two columns, OrderID and ProductID, are required to uniquely identify each row.

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