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D.1 D.2 D.3 D.4 D.5 D.6 General principles 544 Environment conventions 545 Formatting conventions 546 Naming conventions 548 Documentation conventions 552 Programming conventions 553

The JDBC fetch size is an optimization hint for the database driver; it may not result in any performance improvement if the driver doesn t implement this functionality. If it does, it can improve the communication between the JDBC client and the database, by retrieving many rows in one batch when the client operates on a query result (that is, on a ResultSet). Because Hibernate is working with the ResultSet behind the scenes, this hint can improve data retrieval if you execute a query with list() which you ll do soon. When you optimize an application you often have to read complex SQL logs. We highly recommend that you enable hibernate.use_sql_comments; Hibernate will then add a comment to each SQL statement it writes to the logs. You can set a custom comment for a particular query with setComment():

1. Let Ant be Ant Don t try to make Ant into Make. (Submitted by Rich Steele, eTrack Solutions, Inc.) Ant is not a scripting language. It is a mostly declarative description of steps. The declarative nature of Ant can be a source of confusion for new users, especially if a scripting language is expected. 2. Design for componentization. A small project becomes a large project over time; splitting up a single build into child projects with their own builds will eventually happen. You can make this process easier by designing the build file properly from the beginning, being sure to: Use <property location> to assign locations to properties, rather than values. Not only does this stand out, it ensures that the properties are bound to an absolute location, even when they are passed to a different project. Always define output directories using Ant properties. This lets master build files define a single output tree for all child projects.

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3. Design for maintenance. Will your build file be readable when you get back to it six months after the project is finished Will it execute on a clean machine Follow these points: Document the build process. XML may be a file format that is both human readable and machine readable, but it is not the most easily read format for either party. A text file covering the build and deploy process will be appreciated by your successors. Of critical importance is the list of which programs and libraries are needed for the build; without it, running the build will be a trialand-error process. Use comments liberally. Avoid dependencies on programs and JAR files outside the source tree: keep everything you can under source code control for later re-creation of development environments. That includes Ant itself, especially if you have changed it in any way. Keep deployment usernames and passwords out of build files. Passwords should change over time, and security is always an issue. Keep them in property files out of source code control. If a password is required for a build process, the user can be alerted to it being missing by using <fail message="Provide

With no application server to provide a connection pool, an application either implements its own pooling algorithm or relies on a third-party library such as the open source C3P0 connection pooling software. Without Hibernate, the application code calls the connection pool to obtain a JDBC connection and then executes SQL statements with the JDBC programming interface. When the application closes the SQL statements and finally closes the connection, the prepared statements and connection aren t destroyed, but are returned to the pool. With Hibernate, the picture changes: It acts as a client of the JDBC connection pool, as shown in figure 2.3. The application code uses the Hibernate Session and Query API for persistence operations, and it manages database transactions (probably) with the Hibernate Transaction API. Hibernate defines a plug-in architecture that allows integration with any connection-pooling software. However, support for C3P0 is built in, and the software comes bundled with Hibernate, so you ll use that (you already copied the c3p0.jar file into your library directory, right ). Hibernate maintains the pool for you, and configuration properties are passed through. How do you configure C3P0 through Hibernate

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