java - Why @OneToMany does not work with inheritance in Hibernate

java - Why @OneToMany does not work with inheritance in Hibernate

@Entity @Inheritance(strategy=InheritanceType.SINGLE_TABLE) public class Problem{@ManyToOne private Person person;}@Entity @DiscriminatorValue("UP") public class UglyProblem extends Pr…


Hibernate mappings with a discriminator

I have a table with one field that can point to a foreign key in one of 3 other tables based on what the descriminator value is(Project, TimeKeep, or CostCenter. Usually this is implemented with su…


Insert row in table for each id in another table

I tried searching here for a similar solution but didn't see one so I was wondering what is the best way to accomplish the following. I have a table with 17 million+rows all have a unique ID. We h…


Connect two Line Segments

Given two 2D line segments, A and B, how do I calculate the length of the shortest 2D line segment, C, which connects A and B?…


python - Suspicious Operation Django

I've been running into a problem while trying to delete uploaded images. The error is along these lines: SuspiciousOperation: Attempted access to '/media/artists/12-stones/154339.jpg' denied. After r…


java - Efficiency of Hibernate's table-per-subclass inheritance strategy

I'm thinking about table layout for a Hibernate-managed class hierarchy, and certainly the table per subclass technique strikes me as the most appropriate in a general sense. However, thinking throug…


java - Class “model.Address” is listed in the persistence.xml file but not mapped

I have created a JPA project. In that Eclipse displays the following error on the entity class. Class "model.Address" is listed in the persistence.xml file but not mapped How am I supposed to map th…


Inner join in Insert query?

I wanna do something like this: insert into TableA(val1,val2) values("value",(select top 1 tableB.X from tableB where [email protected])) I get this error: Subqueries are not allowed in this con…


What is the maximum number of joins allowed in SQL Server 2008?

What is the maximum number of joins allowed in SQL Server 2008?…



sql-insert into multiple tables in one query

assuming that i have two tables, names and phones and i want to insert data from some input to the tables, in one query- How can it be done? Please, if it can be done, explain the syntax.…




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