JPA and Hibernate Query setParameter – User Guide

Introduction In this article, I’m going to show you how the JPA Query setParameter method works for basic entity attributes, and how you can use it when dealing with custom Hibernate types. If you ever stumbled on the “column is of type jsonb but expression is of type bytea” PostgreSQL issue and didn’t know how to fix it, then you should definitely read this article.

How to get the SQL query from JPQL or JPA Criteria

Introduction In this article, I’m going to show you how you can get the auto-generated SQL query from a JPQL or JPA Criteria API entity query.

Hypersistence Optimizer Runtime Scanner

Introduction The 2.0 version of the Hypersistence Optimizer has just arrived, and it comes with a runtime scanner that is capable of analyzing your JPA and Hibernate data access operations and queries and give you tips about how you can speed up your application. Along with the JPA and Hibernate mapping and configuration scanners, the runtime scanner makes Hypersistence Optimizer an indispensable tool for building High-Performance Java Persistence applications.

How to return a Map result from a JPA or Hibernate query

Introduction In this article, I’m going to show you how you can return a Java Map result when executing a JPA query. I decided to write this article after answering a similar question on StackOverflow.

The best way to use a Hibernate ResultTransformer

Introduction In this article, I’m going to present the best way to use a Hibernate ResultTransformer so that you can customize the result set of a given JPA or Hibernate query. As I already explained, the Hibernate ResultTransformer is a very powerful mechanism, allowing you to customize a JPQL, Criteria API, or native SQL query result set in any possible way.

How to get the query execution plan on SQL Server

Introduction In this article, we are going to see how we can get the query execution plan when using the SQL Server relational database system. The execution plan allows you to understand the operations done by the database engine when executing a specific SQL query.

Query timeout with JPA and Hibernate

Introduction In this article, we are going to see what is the best way to set up the query timeout interval with JPA and Hibernate. Setting the query timeout allows you to cancel slow-running queries that would, otherwise, put pressure on database resources.

The best way to use the JPQL DISTINCT keyword with JPA and Hibernate

Introduction In this article, we are going to how the JPQL DISTINCT keyword behaves depending on the underlying entity query type.

Query pagination with JPA and Hibernate

Introduction Inspired by this StackOverflow answer I gave recently, I decided it’s time to write an article about query pagination when using JPA and Hibernate. In this article, you are going to see how to use query pagination to restrict the JDBC ResultSet size and avoid fetching more data than necessary.

How to map a JPA entity to a View or SQL query using Hibernate

Introduction In this article, you are going to learn how to map a JPA entity to the ResultSet of a SQL query using the @Subselect Hibernate-specific annotation.