By Mark Pollack, Oliver Gierke, Thomas Risberg, Jon Brisbin, Michael Hunger

You could select numerous facts entry frameworks while construction Java company functions that paintings with relational databases. yet what approximately massive facts? This hands-on creation indicates you the way Spring facts makes it fairly effortless to construct purposes throughout a variety of new info entry applied sciences reminiscent of NoSQL and Hadoop. via a number of pattern initiatives, you are going to find out how Spring info offers a constant programming version that keeps NoSQL-specific positive aspects and functions, and is helping you boost Hadoop purposes throughout quite a lot of use-cases resembling facts research, occasion movement processing, and workflow.

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Importing Maven projects into IDEA (step 1 of 2) Figure 1-7. info Figure 1-8. IDEA with the Spring Data Book project opened Next you must add JPA support in the Spring Data JPA module to enable finder method completion and error checking of repositories. Just right-click on the module and choose Add Framework. In the resulting dialog box, check JavaEE Persistence support and select Hibernate as the persistence provider (Figure 1-9). xml file with just a persistence-unit setup. Figure 1-9. info CHAPTER 2 Repositories: Convenient Data Access Layers Implementing the data access layer of an application has been cumbersome for quite a while.

At a very basic level, you can define conditions on entity properties and concatenate them with And and Or. Example 2-9. Query derivation from method names public interface CustomerRepository extends Repository { } List findByEmailAndLastname(EmailAddress email, String lastname); The actual result of parsing that method will depend on the data store we use. There are also some general things to notice. The expressions are usually property traversals combined with operators that can be concatenated.

Beyond that, the Spring Elements node in the navigator will contain a dedicated Spring Data Repositories node to contain all repositories found in your application’s configuration (see Figure 2-4). As you can see, you can discover the repository interfaces at a quick glance and trace which configuration element they actually originate from. IntelliJ IDEA Finally, with the JPA support enabled, IDEA offers repository finder method completion derived from property names and the available keyword, as shown in Figure 2-5.

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