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Tag Archives: JPA

Preventing lost updates in long conversations

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Introduction All database statements are executed within the context of a physical transaction, even when we don’t explicitly declare transaction boundaries (BEGIN/COMMIT/ROLLBACK). Data integrity is enforced by the ACID properties of database transactions. Logical vs Physical transactions An logical transaction is an application-level unit of work that may span over multiple physical (database) transactions. Holding the database connection open throughout ...

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JPA tutorial: Mapping Entities – Part 1

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In this article I will discuss about the entity mapping procedure in JPA. As for my examples I will use the same schema that I used in one of my previous articles. In my two previous articles I explained how to set up JPA in a Java SE environment. I do not intend to write the setup procedure for a ...

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JPA Hibernate Alternatives. What can I use if JPA or Hibernate is not good enough for my project?

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Hello, how are you? Today we will talk about situations that the use of the JPA/Hibernate is not recommended. Which alternatives do we have outside the JPA world? What we will talk about:             JPA/Hibernate problems Solutions to some of the JPA/Hibernate problems Criteria for choosing the frameworks described here Spring JDBC Template MyBatis Sormula ...

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JPA Tutorial – Setting Up JPA in a Java SE Environment

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JPA stands for Java Persistence API, which basically is a specification that describes a way to persist data into a persistent storage, usually a database. We can think of it as something similar to ORM tools like Hibernate, except that it is an official part of the Java EE specification (and it’s also supported on Java SE). There are many reasons to learn an ...

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Compile-time checking JPA queries

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JPA provides several alternatives for querying data. Such alternatives may be classified attending to a variety of criteria, eg, language used (SQL vs JPQL) or whether queries are static (compilation time) or dynamic (execution time). Static queries are defined using annotations @NamedQuery (javax.persistence.NamedQuery) and @NamedQueries (javax.persistence.NamedQueries) in the @Entity class definition itself:         @NamedQuery( name="findAllCustomersWithName", query="SELECT c ...

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A beginner’s guide to JPA/Hibernate flush strategies

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Introduction In my previous post I introduced the entity state transitions Object-relational mapping paradigm. All managed entity state transitions are translated to associated database statements when the current Persistence Context gets flushed. Hibernate’s flush behavior is not always as obvious as one might think.       Write-behind Hibernate tries to defer the Persistence Context flushing up until the last ...

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From JPA to Hibernate’s legacy and enhanced identifier generators

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JPA identifier generators JPA defines the following identifier strategies:                 Strategy Description AUTO The persistence provider picks the most appropriate identifier strategy supported by the underlying database IDENTITY Identifiers are assigned by a database IDENTITY column SEQUENCE The persistence provider uses a database sequence for generating identifiers TABLE The persistence provider uses a ...

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How to use a JPA Type Converter to encrypt your data

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A few days ago, I read an interesting article by Bear Giles about Database encryption using JPA listeners from 2012. He discusses his requirement for an encryption solution and provides a code example with JPA listeners. His main requirements are: provide a transparent encryption that does not affect the application, be able to add the encryption at deployment time, develop ...

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