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Executing arbitrary SQL in the current session [message #688541]

Fri, 24 June 2011 18:01

Eclipse User

I am new to JPA 2.0/EclipseLink/Glassfish/JEE6, and have kind of a basic question.

I have a DAO in which most of the entities are mapped directly to columns using JPA annotations, so I use the EntityManager, and it works great with no issues.

However there are some tables in which I am constructing the SQL statements myself b/c they use oracle-specific functions (spatial), and I want very fine-grained control of the SQL. So I am building it with string concatenation. I would like to be able to enroll my SQL executions in the current transaction, if there is one already underway.

So naturally I don't want to go directly to the DriverManager and create my own connection, I was looking for some kind of EntityManager.executeArbitrarySQL(String) function that would find the current connection and make my SQL part of the current transaction. Am I off my rocker?

[Updated on: Fri, 24 June 2011 18:02] by Moderator

Re: Executing arbitrary SQL in the current session [message #689375 is a reply to message #688541]

Mon, 27 June 2011 10:29

Eclipse User

You can execute any SQL in JPA using a native Query.

i.e.
em.createNativeQuery(mySQL).executeUpdate(); (or getResultList())

There are also result set mappings, and EclipseLink has specialize support for stored procedure.

Note that EclipseLink also has support for Oracle spatial objects.

If you need raw JDBC access, you can get the JDBC connection from the EntityManager,

See,
http://wiki.eclipse.org/EclipseLink/Examples/JPA/EMAPI#Getting_a_JDBC_Connection_from_an_EntityManager

http://en.wikibooks.org/wiki/Java_Persistence/Querying#Native_SQL_Queries

http://wiki.eclipse.org/EclipseLink/FAQ/JPA#Are_stored_procedures_and_triggers_supported.3F

http://dev.eclipse.org/svnroot/rt/org.eclipse.persistence/trunk/examples/org.eclipse.persistence.example.jpa.spatial/

(no subject) [message #689393 is a reply to message #688541]

Mon, 27 June 2011 10:29

Eclipse User

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