JPA
1.Hibernate / JPA (1)
Hibernate / JPA uses JDBC for all database communicationsThe developer defines mapping between Java class and database tableJakarta Persistence API \
2.JPA Annotations(Overview)
⚾Step1: Map class to database tableJava Class -- Database Table⚾ Step2: Map fields to database columnsNot recommend this approachThis is a breaking ch
3.Saving a Java Object with JPA
Create a new StudentRead a StudentUpdate a StudentDelete a StudentResponsible for interfacing with the databaseThis is a common design pattern: DAOhon
4.Retrieving a Java Object with JPA
\- Read objectsStudent: Entity class1: Primary keyif not found, returns null⚾ Step1: Add new method to DAO interface⚾ Step2: Define DAO implementation
5.Querying Objects with JPA
Query Language for retrieving objectsSimilar in concept to SQL \- where, like, order by, join ...JPQL is based on entity name and entity fields"FROM
6.Updating Objects with JPA
<span class = 'red' style="background-color: \`\`\`java Student theStudent = entityManager.find(Student.class, 1);// chage first name to 'PingPong'
7.Deleting Objects with JPA
<span style="background-color:\`\`\`java//retrieve the studentint id = 1;Student theStudent = entityManager.find(Student.class, id);//delete the St
8.Create Database Tables from JPA
JPA/Hibernate provides an option to <span style="background-color:- Creates tables based on Java code with JPA/Hibernate annotationsapplication.pro