Java Persistence Query Language

Chapter 8 - Java Persistence Query Language

    Java Persistence Query Language

  • Java Persistence Query Language

    Introduction

              The Java Persistence Query Language(JPQL) is an area of Java Persistence which allows you to write portable queries that work regardless of the underlying data store.An entity is a lightweight persistence domain object.

              It uses a SQL-like syntax to select objects or values based on entity abstract schema types and relationships among them.An entity represents a table in a relational database, and each entity instance corresponds to a row in that table.

              The Java Persistence query language defines queries for entities and their persistent state. The query language allows you to write portable queries that work regardless of the underlying data store.

              The query language uses the abstract persistence schemas of entities, including their relationships, for its data model, and it defines operators and expressions.

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