Grails Persistence with GORM and GSQL by Bobby Fischer

By Bobby Fischer

Special to the preferred Grails internet framework is its structure. whereas different frameworks are outfitted from the floor up, Grails leverages latest and confirmed applied sciences that have already got complicated performance in-built. one of many key applied sciences during this structure is Hibernate, on best of which Grails builds its GORM (Grails item Relational Mapping) version layer. this offers Grails a patience answer. This firstPress booklet covers Grails patience with GORM, from defining your first version to the character of transactions and complicated Hibernate querying. different APIs and instruments akin to GSQL (Groovy SQL) are lined to boot, as wanted, to empower your Grails endurance efforts.

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Example text

It is left empty if the new operator is followed by an interface name. If is present, it contains the actual parameter list for a constructor of the existing class to be invoked. The anonymous class body is written as usual inside braces. The above syntax can be broken into two for simplicity: the first syntax is used when the anonymous class implements an interface and the second one is used when it inherits a class. new Interface() { // Anonymous class body goes here } and new Superclass() { // Anonymous class body goes here } Anonymous classes are very powerful.

Println("Version: major=" + major + ", minor=" + minor); } You will use the Version and Deprecated annotation types to annotate your program elements, and access those annotations at runtime. You will also annotate a package declaration and a method declaration. You will use the code for the Version annotation type as listed in Listing 1-18. RUNTIME) annotation, which is needed to read its instances at runtime. Listing 1-18. java file and compile it along with other programs. annotation package.

This section discusses in detail how to develop annotation processors to process annotation at the source code level when you compile Java programs. The University of Washington has developed a Checker Framework that contains a lot of annotations to be used in programs. It also ships with many annotation processors. edu/checker-framework. It contains a tutorial for using different types of processors and a tutorial on how to create your own processor. Java lets you process annotations at runtime as well as at compile time.

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