'How to Get Started With JPA/Hibernate' java jpa
Connect to the database using an SQL client and create the following database:A Persistence Unit is the logical grouping of a set of classes of which objects can be persisted, plus configuration parameters like database connection and pooling options. A Persistence Unit is defined in a parameters. Every Persistence Unit needs a name that we can use later in the code. The transaction type indicates who manages the transactions, JPA or the server.
We added properties to specify the JDBC connection URL and the database user and password. We also activated a database action to drop and create the database schema automatically. This will make JPA drop the database and recreate them any time we start the application. This obviously is not a good idea in production environments, but very useful during development, especially when you are starting to define the database objects through JPA Entities.
package com.example; import jakarta.persistence.*; import java.util.Objects; @Entity @Table public class ProgrammingLanguage { @Id @GeneratedValue @Column private Integer id; @Column private String name; @Column private Integer rating; public ProgrammingLanguage { } public ProgrammingLanguage { this.name=name; this.rating=rating; } @Override public boolean equals { if return true; if !=o.getClass) return false; ProgrammingLanguage that= o; return Objects.
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