Mapping annotations in spring boot3/1/2024 SessionFactory = new AnnotationConfiguration().configure().buildSessionFactory() Private static final SessionFactory sessionFactory This class is well-known in hibernate community, and used for configuring hibernate on startup and managing session factory. Create this file with below content and save it in src/main/resources folder. We need to inform hibernate about how to connect to database, which database dialect we will be using so that hibernate can generate the instruction specific to that database. Step 5: Create Hibernate configuration file One important remark : In case of *Many* association, always override hashcode and equals method which are looked by hibernate when holding entities into collections. joinColumns refers to the column name of owning side(STUDENT_ID of STUDENT), and inverseJoinColumns refers to the column of inverse side of relationship(SUBJECT_ID of SUBJECT).Primary key of this joined table is combination of STUDENT_ID & SUBJECT_ID. A Student can enroll for multiple subjects, and a subject can have multiple students enrolled.Notice cascade = CascadeType.ALL, with cascading while persisting (update/delete) Student tuples, subjects tuples will also be persisted indicates that there is a link table which joins two tables via containing there keys.This annotation is mainly used on the owning side of the relationship. Private List subjects = new indicates that there is a Many-to-Many relationship between Student and subject. Model class Student & Subject are simple POJO class which is annotated with JPA annotations to map it to a database tables(created in step 1). On saving pom.xml with above content, Eclipse will download all the dependencies. ![]() Step 3: Update pom.xml to include required Hibernate and MySQL dependencyįollowing is the updated minimalistic pom.xml Step 2: Create project directory structureįollowing will be the final project structure: ![]() Please visit MySQL installation on Local PC in case you are finding difficulties in setting up MySQL locally. then we have created a joined table STUDENT_SUBJECT whose primary key is the combination of primary keys of STUDENT & SUBJECT. ![]() Here we have first created the main tables STUDENT & SUBJECT. Subject_id BIGINT NOT NULL AUTO_INCREMENT,ĬONSTRAINT FK_STUDENT FOREIGN KEY (student_id) REFERENCES STUDENT (student_id),ĬONSTRAINT FK_SUBJECT FOREIGN KEY (subject_id) REFERENCES SUBJECT (subject_id) Student_id BIGINT NOT NULL AUTO_INCREMENT, Open MySQL terminal / workbench terminal and execute following MySQL script : Spring Batch- MultiResourceItemReader & HibernateItemWriter example.Spring Security 4 Hello World Annotation+XML Example.Spring 4 + Hibernate 4 + MySQL+ Maven Integration example (Annotations+XML).Spring MVC 4+Hibernate 4+MySQL+Maven integration example.Hibernate Many To Many Annotation Unidirectional.Hibernate Many To One Annotation Bidirectional.Hibernate Many To One Annotation Unidirectional. ![]()
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