什么是CDI中的Spring-JDBC？

Question

Considering replacing Spring with CDI in new project, I've encountered a problem challenge:

We do a plenty of things with SQL queries (for which JPA isn't reasonable): invoking stored procedures, reporting, specialized queries with complicated syntax.

There's a plenty of trivial examples for CDI database access in Internet, and for trivial examples JPA is sufficient. But how do you work with SQL in JPA?

I'm looking for something like Spring-JDBC, with simplified interface for running SQL queries through JDBC and container managing transactions (through annotations), but I havent't found anything yet.

How do one work with SQL queries in CDI? Is it possible with CDI core or extensions?

Answer 1

There isn't anything in the Spec about doing this. You'd have to create your own library, create the transaction layer (or use JTA 1.2 from Java EE 7, or Apache Deltaspike) and build it all up that way. I did mention DeltaSpike , which in the (hopefully) soon to be released version 0.5 will have some of these query and other DB specific features.

Answer 2

CDI stands for Contexts/Dependency Injection (if I'm not mistaken). By itself it has nothing to do with SQL. Using CDI with JPA allows you to work with the database, but even in this case JPA does all the work. CDI has very little to do with it.

If you want to work with native queries and JPA's nativeQuery isn't enough, you'll have to either add the Spring-JDBC dependency to your project, or since you're moving away from Spring, another smaller library that would give you things similar to JdbcTemplate and such.

So to sum it up, CDI has no equivalent of Spring-JDBC, just as Spring doesn't have an equivalent of Swing GUI.