Spring Data JPA

by 0 comments on "Many-to-Many Relationship in Spring Boot Rest + JPA"

In this article, we will learn about the Many-to-Many relationship in JPA and its implementation in a Spring Boot Application. Let’s make a start! @ManytoMany annotation A many-to-many relationship occurs when multiple records in a table have an association with multiple records in another table. @ManytoMany annotation defines a many-valued association with many-to-many multiplicity. As per the official documentation: Every…

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by 0 comments on "How to use Project Lombok in Spring Boot"

In this tutorial, you will learn how to use the Spring Boot application with project Lombok. Overview No doubt Java is a wonderful language but one of the drawbacks of Java is its verbose nature. This makes it fairly complicated for everyday tasks such as composing a simple POJO object. For example, Constructing of methods…

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by 0 comments on "One to Many Mapping Hibernate/JPA Using Spring Boot and MySQL"

In this tutorial, I will demonstrate how to implement the One-to-Many Mapping in your Spring Boot application that uses Hibernate/Spring Data JPA. As a database, I will use a MySQL server. To demonstrate how the one-to-many relationship works, I will implement two JPA entities: a Book and a Story. One book can have many stories…

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by 0 comments on "One to One Mapping Hibernate/JPA Using Spring Boot and MySQL"

In this tutorial, I will demonstrate how One to One Mapping in Hibernate/Spring Boot Data JPA works. As a database, I will use a MySQL database server. We will create two JPA entities: the Book and the Story. The Book and the Story entities have one to one relationship which means that the Book entity…

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by 0 comments on "Calling a Stored Procedure in Spring Boot REST with JPA"

In this tutorial, you will learn how to call stored procedures in a Spring Boot RESTful API project that uses Spring Data JPA. Using a stored procedure to execute parts of the application logic in the database is a widely used approach in huge, data-heavy applications. A stored procedure is a group of predefined SQL…

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by 0 comments on "Specification & Predicate: Advance Search and Filtering in JPA"

In this tutorial, you will learn how to use specification and predicate in Spring Data JPA using the Spring Boot RESTful API project. Spring Data JPA Specifications allow us to create dynamic database queries by using the JPA Criteria API. It defines a specification as a predicate over an entity. Spring has a wrapper around…

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by 0 comments on "Rollback Using @Transactional in Spring with JPA"

In this short tutorial, you will learn how to rollback a database change using @Transactional annotation in your RESTful Web Service built with Spring MVC and JPA. Rollback with @Transactional Annotation Sometimes if an error takes place in our RESTful Web Service we want to rollback the changes made. For changes to be rolled back…

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by 0 comments on "Select Specific Columns with JPA Native Query"

In this short Spring Data JPA tutorial, you will learn how to create a JPA Native SQL Query to select specific columns only. JPA Native SQL Query to Select Specific Columns Below is an example of JPA Native Query that selects from a database table called Users only two columns: first_name and, last_name @Query(value=”select first_name,…

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by 0 comments on "How to Use LIKE % Expression in JPA SQL Query"

In this short Spring Data JPA tutorial, you will learn how to use the LIKE % expression in a Native SQL Query. When using advanced SQL LIKE expression the % sign in the SQL query would represent zero, one or multiple characters. Let’s have a look at the Native JPA SQL Query that uses advanced…

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by 0 comments on "Show Hibernate SQL Query in Spring Boot"

In this short Spring Boot tutorial, I am going to share with you how to make Spring Boot app show Hibernate SQL Queries. Enable Hibernate SQL Queries Logging To show hibernate SQL queries in Spring Boot log file you will need to update the application.properties file with the following details: logging.level.org.hibernate.SQL=debug Show SQL Values Additionally,…

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by 0 comments on "Spring Data JPA Native UPDATE SQL Query"

In this short Spring Data JPA tutorial, you will learn how to write a Native UPDATE SQL query. Let’s assume you need to run the following SQL query: update users u set u.EMAIL_VERIFICATION_STATUS = ‘true’ where u.USER_ID = ‘5JwQBHd1mL73XEg8S2e2w4ITn9gOW4’ I assume you will not want to hardcode the values of EMAIL_VERIFICATION_STATUS and USER_ID into SQL…

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by 0 comments on "Configure Spring Data JPA in Jersey 2 JAX-RS App"

In this blog post, I am going to share with you how to configure Spring Data JPA in a Jersey 2 Container Deployable Web App. Spring Data JPA makes it much easier and more convenient to persist and read data from the database and when I needed to tie together Spring Data JPA and Jersey 2 Web…

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by 0 comments on "Configuring JPA in Jersey 2 Web App"

With this blog post, I am going to share what I needed to do to make JPA work in my Jersey 2 Web Services App. I have created my Jersey 2 app using the following maven snippet: mvn archetype:generate -DarchetypeGroupId=org.glassfish.jersey.archetypes \ -DarchetypeArtifactId=jersey-quickstart-webapp -DarchetypeVersion=2.26 I then opened pom.xml and added a few new dependencies which I…

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by 3 comments on "RESTful Web Services with Jersey and Spring Data JPA – Cheat Sheet"

Create a Servlet Container deployable Jersey web application Create new Jersey web application using Maven. The project created with the below jersey-quickstart-webapp archetype can be built and deployed to a servlet container like for example Apache Tomcat. mvn archetype:generate -DarchetypeGroupId=org.glassfish.jersey.archetypes \ -DarchetypeArtifactId=jersey-quickstart-webapp -DarchetypeVersion=2.26 POM.XML Dependency to Support JSON To support JSON in your Jersey Web App add…

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