JPQL
JPQL is an object-oriented persistence query language for expressing queries in terms of Java or Jakarta Persistence entity classes and their properties.
Java Persistence with Spring Data and Hibernate epub
JPQL is the JPA query language that expresses queries in terms of persistent entity classes and their properties.
- How it is used
- Expresses application queries over persistent entity classes and properties through the JPA programming model.
- How deep it goes
- Defines entity-oriented naming and demonstrates typed selection and ordering, without detailing JPQL grammar or query translation internals.
- Examples
- Uses Message, Bid, and Item queries, including property-based ordering and typed result retrieval.
- What you can do after
- Apply JPQL via EntityManager to select and order entities across relational and supported NoSQL persistence configurations.
Read how Java Persistence with Spring Data and Hibernate epub explains JPQL →
Troubleshooting Java, Second Edition
JPQL is an object-oriented query language for retrieving and manipulating persistent entities defined by the Java Persistence API.
- How it is used
- Uses object-based persistence queries while helping investigate SQL generated by frameworks.
- How deep it goes
- Defines JPQL briefly and stops short of its grammar or query-writing rules.
- Examples
- Uses a product repository, a product endpoint, profiler output, and a copied SQL query examined in a SQL client.
- What you can do after
- Diagnose framework-generated SQL by profiling JDBC traffic and investigating captured queries in a SQL client.
Read how Troubleshooting Java, Second Edition explains JPQL →
Related concepts
- SQLalternative to · SQL is a standardized declarative language for defining, querying, and manipulating data in relational database systems.
- JPApart of · JPA, now Jakarta Persistence, is a Java standard for mapping objects to relational data and managing their persistence.
- entityuses · An entity is a distinct, identifiable person, object, event, or concept represented as a unit in a data, software, or semantic model.
- filterconfigured by · Filter is a Hibernate API object representing an enabled filter and providing methods for setting and validating its runtime parameters.
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