Unique to the popular Grails web framework is its architecture. While other frameworks are built from the ground up, Grails leverages existing and proven technologies that already have advanced functionality built in. One of the key technologies in this architecture is Hibernate, on top of which Grails builds its GORM (Grails Object Relational Mapping) model layer. This provides Grails a persistence solution.
After completing this chapter, students will be able to: Become familiar with several object-persistence formats, be able to map problem domain objects to different object-persistence formats, be able to apply the steps of normalization to a relational database, be able to optimize a relational database for object storage and access,...
The new version of PHP is out. RC4 was the last step
before the final release—developers have been asked to
commit to the PHP CVS repository only changes that fix
bugs marked as “critical” in the bug tracking system,
and thankfully only lasted a few days.
The PHP developers have also solved a dilemma that
has all but dominated the mailing lists of late—the
naming of the CLI (command-line interface) version of
PHP vs. the CGI executable, which is used when using
PHP as a separate executable to run scripts through a
Hibernate 3.0, một công nghệ mới nhất trong nền tảng cốt lỗi của J2EE EJB 3.0.
Hibernate là một framework cho persistence layer, là một dịch vụ lưu trữ và truy vấn dữ liệu quan hệ mạnh mẽ và nhanh chóng. Hibernate giúp người phát triển các class dùng để lưu trữ dữ liệu theo cách thức hướng đối tượng: association, inheritance, polymorphism, composition và collections.
This book packs in information about the release of the Hibernate 3.5 persistence layer and provides a clear introduction to the current standard for object-relational persistence in Java. And since the book keeps its focus on Hibernate without wasting time on nonessential third-party tools, you’ll be able to immediately start building transaction-based engines and applications.
Currently the Internet has only one level of name resolution, DNS,
which converts user-level domain names into IP addresses. In this
paper we borrow liberally from the literature to argue that there
should be three levels of name resolution: from user-level descriptors
to service identifiers; from service identifiers to endpoint identifiers;
and from endpoint identifiers to IP addresses.
Most well-architected EJB projects make use of design patterns. Whether or not
a developer is actually aware that he’s using design patterns is another story.
Oftentimes developers conceive of best practices during their projects, and
aren’t aware that these best practices are actually design patterns—reusable
approaches to programming—that are beneficial to other developers on their
projects as well.
The research of neural networks has experienced several ups and downs in the 20th
century. The last resurgence is believed to be initiated by several seminal works of Hopfield
and Tank in the 1980s, and this upsurge has persisted for three decades. The Hopfield
neural networks, either discrete type or continuous type, are actually recurrent neural
networks (RNNs). The hallmark of an RNN, in contrast to feedforward neural networks, is
the existence of connections from posterior layer(s) to anterior layer(s) or connections
among neurons in the same layer....
The southeasterly wind pattern measured at Chalco was the most consistent flow feature
measured during the experimental period. These winds developed in the mid-afternoon in a layer up
to 1 km deep and continued for several hours. The local upslope flows evident in the early afternoon
in the southwestern part of the basin were weaker and shallower than anticipated. These flows have
been associated with the prevalence of high ozone concentrations in this area of the valley.