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This video gives a quick overview of the differences we'll see in integrating Hibernate with Spring, in comparison to using Hibernate outside of the Spring Framework.
Let's start by talking about how things
look a little different when incorporating
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hibernate into spring,
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as opposed to using hibernate in
a standard command line application.
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First, recall that in hibernate basics
we created a hibernate session factory
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which encapsulates all the mapping
data between our entities.
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Remember, those are our model classes or
pojo's and a database.
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In this course,
instead of the hibernate SessionFactory,
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we'll use the spring framework's
LocalSessionFactoryBean.
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This is because a spring container,
or application context
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will be managing the SessionFactory,
creating it as a Spring bean at runtime.
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Next in Spring, we'll configure the data
source separately using a third party
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library from Apache called DBCP, which
stands for Database Connection Pooling.
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In a nutshell, connection pooling allows
the application to keep alive a specified
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number of database connections, and
then reuse them when they're needed.
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This gives us a boost in performance,
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since database connections
take some time to establish.
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Also related to the data source,
if you recall in Hibernate basics,
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we let Hibernate grab the configuration
settings for our data source.
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In this course, we'll instead configure
the data source as a Spring bean,
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kind of like the LocalSessionFactoryBean.
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And this is where we'll specify
things like the connection URL,
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the database driver that Hibernate
should use, which is H2 in our case.
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In addition to these three things,
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you'll see plenty more that
will add to this application.
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We'll explore application
design principles as they apply
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to separating the components into web
components like Spring controllers.
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Data access components call
data access objects, and
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a component that sits between
those two called services.
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Next, we'll review the application
that we're going to be working with
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during this course.
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