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This is possible, though, only if the provider includes the order column in the primary key of the table or gives you the option of configuring it in that way Before you rejoice that your provider might allow you to store duplicates, be aware that there is a price to pay This can be seen in the example of exchanging the order of two elements in the List If the order column were just a regular column, it wouldn t be too much of a stretch for the provider to optimize the database operations by simply updating the order columns of the two records with the correct values However, if the order column is part of the primary key, what you are really saying is that the ordering of the contained object in the List is an integral part of the relationship between the containing and contained objects.

As the name suggests, DAOs are generic objects and theoretically can support any kind of persistence store. The primary goal of these classes is to abstract the underlying data access mechanism from the business services. Since most applications interact with RDBMSs, I will focus only on JDBC-based data access objects. The Spring JDBC module implements robust object design principles that make it simple to develop JDBC-based DAOs. It takes care of all the boilerplate code generally associated with JDBC API usage and helps provide a consistent API for data access. Application developers are no longer required to work directly with the JDBC API; instead, they work with a high-level API. Because eInsure had an affinity for Oracle owing to its legacy, the SQL syntax used in the next few sections will be compatible with Oracle Database. But the general discussion and concepts hold true for any database, and using them merely involves making minor changes in the SQL statements. Listing 5-2 shows the Oracle script to create the T_POLICY_DETAIL table and corresponding sequence.

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Notice that we create a new Criteria object for the products property, add restrictions to the products criteria we just created, and then obtain the results from the supplier criteria query object: Criteria crit = sessioncreateCriteria(Supplierclass); Criteria prdCrit = critcreateCriteria("products"); prdCritadd(Restrictionsgt("price",new Double(250))); List results = critlist(); Going the other way, we can obtain all of the products from the supplier MegaInc using many-to-one associations: Criteria crit = sessioncreateCriteria(Productclass); Criteria suppCrit = critcreateCriteria("supplier"); suppCritadd(Restrictionseq("name","MegaInc")); List results = critlist(); Although we used either criteria to obtain the results, when we sort the result set, it makes a difference which criteria we use for ordering the results In the following example, we are ordering the supplier results by their name: Criteria crit = sessioncreateCriteria(Supplierclass); Criteria prdCrit = critcreateCriteria("products"); prdCritadd(Restrictionsgt("price",new Double(250))); critaddOrder(Order.

Assigning a new order to the contained object is not modifying an aspect of the relationship, but effectively destroying the relationship and creating a new one with a different ordering That means deleting the two old rows and creating two new ones A Map has keys that must be unique, so duplicate keys clearly don t make sense It is similar to a List when it comes to its values, however, because it has a key column that can be part of the primary key Once again, the case of the foreign key in the target table does not allow for multiple keys to point to the same entity, so one-to-many relationships that are mapped that way simply do not permit the same entity to be mapped to multiple keys in the same Map.

For join tables and collection tables, duplicates will be possible in the Map only if it is keyed by something other than an attribute of the entity, or embeddable, and the key column is included in the primary key The trade-off in the case of the Map is similar to the one that we discussed with List, except that the price of allowing duplicates in a Map is paid when you want to reassign an existing key to a different value..

CREATE table "T_POLICY_DETAIL" ( "POLICY_ID" NUMBER, "PRODUCT_CD" VARCHAR2(20) NOT NULL, "POLICY_HOLDER" VARCHAR2(150) NOT NULL,

It is probably even less common to insert null values in a collection than it is to have duplicates This is one reason why the JPA specification is not particularly clear on what happens when you insert null into a collection As with duplicates, the cases are a little complex and require individual consideration The Set, List, and Map interfaces join the Collection interface in being general enough to be wishywashy when it comes to specifying what happens when null is inserted They simply delegate the decision to the implementation, so an implementation class might choose to support inserting null values or simply throw an exception JPA does no better; it ends up falling to the particular vendor s proxy implementation to allow null or throw a NullPointerException when null is added.

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