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about duplicates in the database In fact, the JPA specification does not say anything about whether duplicates are allowed in collections, either in the database or in memory, and in most cases they will not be supported To get a feeling for why supporting duplicates is difficult, we need to go to the data model and uncover some of the gory details You might prefer to skip this section if duplicates are not interesting to you Read on, however, if you are in a situation where an external application can come in behind your back and insert a duplicate record, for example The Collection interface is very general and allows for a multitude of Collection subinterfaces and implementation classes So it is very soft in its specification of whether duplicates are allowed, instead allowing the subinterface or implementation class to decide what behavior best fits that Collection type.

You should prevent the unnecessary mixing of business logic with persistence logic. The entity bean is an obsolete technology. The business tier required a consistent API to access integration tier components. Working directly with the JDBC API leads to a lot of boilerplate code being written, thus degrading reusability and increasing development time.

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For a Collection that does happen to allow duplicates, collection-valued relationship mappings use either a foreign key in the target entity table or a join table The first case will always be a one-to-many mapping, and in that case there will be only one row for the target entity, and only one column in that row to contain the foreign key to the source entity That leaves no way to capture the fact that the target entity is in the collection more than once In the join table case, each row stores a join column to the source entity and a join column to the target entity, and the primary key of the join table is composed of the combination of the two.

To add a restriction on a class that is associated with your criteria s class, you will need to create another criteria query object Pass the property name of the associated class to the createCriteria() method on the Criteria object, and you will have another Criteria object You can get the results from either Criteria object, although you should pick one style and be consistent for readability s sake We find that getting the results from the top-level Criteria object (the one that takes a class as a parameter) makes it clear what type of object is expected in the results The associations work going from one-to-many as well as from many-to-one First, we will demonstrate how to use one-to-many associations to obtain the suppliers who sell products with a price over 250.

Only duplicate rows in that model could link multiple instances of the target to the same source, and duplicate rows in a relational database are highly frowned upon An element collection is in a similar situation, except that instead of a foreign key to the target entity there are one or more columns in the collection table storing the basic or embeddable values These columns just combine with the foreign key to the source entity to make up the primary key, and once again duplicate rows would be required to have duplicate values in a collection The persistently ordered List is a little different, however, because it adds an order column to the mix.

Implement a data access object (DAO) to encapsulate the data access logic and provide a consistent interface to the business tier components.

If the order column were to be included as part of the primary key, multiple relationship entries could exist in the List each of their respective rows potentially having the same element value data and foreign key reference, but differing only by the value of the order column Thus, the uniqueness of a row is identified not only by the source and target objects but also by its position in the List In the case of the foreign key in the target table, it would be bad practice indeed to include the order column in the primary key of an entity table, so we won t even explore that as an option However, when a join table or collection table is used, it is a perfectly reasonable thing to do, allowing duplicate values to be inserted in a persistently ordered List.

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