Cascade

I have an object called "Customer" which will be used in the other tables as foreign keys. The problem is that I want to know if a "Customer" can be deleted (ie, it is not being referenced in any other tables). Is this possible with Nhibernate? Jaguar What you are asking is to find the existence of the Customer PK value in the referenced tables FK column. There are many ways you can go about this: as kgiannakakis noted, try to do the delete and if an exception is thrown rollback. Effective but ugly and not useful. This also requires that you have set a CASCADE="RESTRICT" in your database. This

I have following problem: when I try to delete an entity that has following relation: @OneToMany(mappedBy="pricingScheme", cascade=CascadeType.ALL, orphanRemoval=true) private Collection<ChargeableElement> chargeableElements; with a CrudRepository through a provided delete method it removes the entity along with its all chargeable elements which is fine. The problem appears when I try to use my custom delete: @Modifying @Query("DELETE FROM PricingScheme p WHERE p.listkeyId = :listkeyId") void deleteByListkeyId(@Param("listkeyId") Integer listkeyId); it says: com.mysql.jdbc.exceptions.jdbc4

I am trying to figure out how cascade delete works. I know the general concept but not the specifics of it. I have 3 tables (a)||---|<(B)>o---||(C) Table A: Aid Tag Table B: Aid (f) Cid (F) Table C: Cid Other A row in table A must have at least one reference to table c or else it should be deleted. A row in table A is made only when Table C tries creating a tag that does not exist. If table C removes that tag and no other rows from table C reference that tag then the tag should be removed. If another row from table C references that tag then the tag should not be deleted. If I set Table B [Aid

Overview: I'm building a spring-boot application which, in part, retrieves some entities from an external REST service and compares it to previous versions of the entity held locally in a database. I'm injecting EntityManager with @PersistenceContext , and using that to work with the database, as there are many entity types, and the type is initially unknown to the module. I could get a JpaRepository from a factory, but the number of different entity types is liable to grow, and I'd rather not rely on that if at all possible. Problem: When the module retrieves an entity which it doesn't hold

I am using spring, JPA with Hibernate. I got the following entities: @Entity @Table(name = "Supplier") public class Supplier { @Id @Column(name = "Supplier_ID", nullable = false) private Integer supplierId; ... } and, @Entity @Table(name = "Product") public class Product { @Id private Integer productId; @ManyToOne(cascade = CascadeType.ALL) @OnDelete(action = OnDeleteAction.CASCADE) @JoinColumn(name = "Supplier_ID") private Supplier supplier; ... } Now, my question is, with the given schema when I delete a row from child ( ie. Product), will the Supplier will also get deleted? Or, it is only

I've spent a good amount of time trying to figure out how to implement a CASCADE ON DELETE for recursive primary keys on SQL Server for some time now. I've read about triggers, creating temporary tables, etc but have yet to find an answer that will work with my database design. Here is a Boss/Employee database example that will work for demonstration purposes: TABLE employee id|name |boss_id --|---------|------- 1 |John |1 2 |Hillary |1 3 |Hamilton |1 4 |Scott |2 5 |Susan |2 6 |Seth |2 7 |Rick |5 8 |Rachael |5 As you can see, each employee has a boss that is also an employee. So, there is a PK