Category Archives: JPA

Mapping a map of simple types in JPA using @ElementCollection

Posted on March 5, 2018 by Robert Piasecki

In the previous post I have shown how to easily map a collection (e.g. Set or List) of simple types in JPA. Today I would like to present how we achieve something similar for Java maps like HashMap or TreeMap. … Continue reading →

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Mapping collection of simple type in JPA using @ElementCollection

Posted on February 11, 2018 by Robert Piasecki

JPA framework provides good support for mapping collections of value types. The value types can be either simple types like Integer or String, or custom embeddable types. In this short post I would like to present two most popular mappings … Continue reading →

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Database schema creation in JPA using SQL scripts

Posted on February 12, 2017 by Robert Piasecki

Recent versions of JPA provide a feature to automatically create the database objects (like tables, sequences or indexes), load initial data into database on application deployment; and also remove them after the application is undeployed. All that is needed is … Continue reading →

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Primary key generation in JPA

Posted on August 2, 2014 by Robert Piasecki

Generation of primary key values is a very important functionality of relational database management systems. The main idea is to let RDBMS automatically calculate and assign primary key value to the row being inserted into the database table. This not … Continue reading →

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Using JPA and JTA with Spring

Posted on March 15, 2014 by Robert Piasecki

When building a web application, we will sooner or later need to somehow store data entered by users and retrieve it later. In most cases the best place to keep this data is a database because it additionally provides many … Continue reading →

Posted in Java, Java EE, JPA, JTA, Spring | Tagged , , , , , , | 15 Comments