Скачать или смотреть Many to Many relation Spring Boot JPA Save operation using User and Role example part2 - Session 24

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This video explains how to save many to many relations. Many to Many relation nothing but one table's multiple records associated with another table vice versa. The best example is the User and Role table. A user can have multiple Roles. One Role can apply with multiple Users. This is called Many to Many Relationship. In order to implement many-to-many relationships in JPA, we have to use the @ManyToMany Annotation in the entity object and we need to using @JoinTable Annotation to tell which id need to associate with two tables. In the first parameter, I am saying that I want to create user_roles as a join table. in the second and third parameters, I am joining for each table's column using @JoinColumns.
@JoinTable(
name="user_roles",
joinColumns=
@JoinColumn( name="user_id", referencedColumnName="REC_ID"),
inverseJoinColumns=@JoinColumn(name="role_id", referencedColumnName="REC_ID"))

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