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Sometimes you know you are only going to return one or zero objects with a given criteria query. This could be because you are calculating an aggregate (like COUNT, which we discuss later), or because your restrictions lead to a unique result. You may also limit the results of any result set to just the first result, using the setMaxResults() method we discussed earlier. If you would like to just obtain an Object instead of a List, the uniqueResult() method on the Criteria object returns an Object or null if there are zero results. If there is more than one result, the uniqueResult() method throws a HibernateException. A short example demonstrates having a result set that would have included more than one result, except that it was limited with the setMaxResults() method: Criteria crit = session.createCriteria(Product.class); Criterion price = Restrictions.gt("price",new Double(25.0)); crit.setMaxResults(1); Product product = (Product) crit.uniqueResult(); //test for null here if needed Again, we stress that you need to make sure that your query only returns one (or zero) results if you use the uniqueResult() method. Otherwise, Hibernate will throw a NonUniqueResultException exception, which may not be what you would expect. Hibernate does not just pick the first result and return it.

private String name; private long salary; @ElementCollection(targetClass=String.class) @CollectionTable(name="EMP_PHONE") @MapKeyColumn(name="PHONE_TYPE") @MapKeyClass(String.class) @Column(name="PHONE_NUM") private Map phoneNumbers; // ...

if(rs!=null){ try { rs.close(); } catch (SQLException ex) { throw new RuntimeException(ex); } } if(pstmt!=null){ try { pstmt.close(); } catch (SQLException ex) { throw new RuntimeException(ex); } } if(conn!=null){ try { conn.close(); } catch (SQLException ex) { throw new RuntimeException(ex); } } } return policyList; } }

The @MapKeyClass annotation should be used whenever the key class cannot be deduced from the attribute definition or the other mapping metadata.

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Learning about the various Map variants can get kind of confusing given that we can choose any one of three different kinds of key types and three different kinds of value types. Below are some of the basic rules of using a Map. Use the @MapKeyClass and targetEntity/targetClass elements of the relationship and element collection mappings to specify the classes when an untyped Map is used. Use @MapKey with one-to-many or many-to-many relationship Map that is keyed on an attribute of the target entity. Use @MapKeyJoinColumn to override the join column of the entity key. Use @Column to override the column storing the values of an element collection of basic types. Use @MapKeyColumn to override the column storing the keys when keyed by a basic type. Use @MapKeyTemporal and @MapKeyEnumerated if you need to further qualify a basic key that is a temporal or enumerated type. Use @AttributeOverride with a key. or value. prefix to override the column of an embeddable attribute type that is a Map key or a value, respectively.

The mixed approach to persistence in eInsure (entity beans and straight JDBC) made the business component vulnerable to change. As you can see in Listing 5-1, the direct use of the JDBC API meant a lot of boilerplate code for establishing a connection, preparing SQL statements, setting parameters, executing the SQL, iterating over the result set to prepare a list of Java objects, and finally releasing database resources. This last step is critical and often neglected, causing connection leaks and resource wastage. If the straight JDBC approach were used in all the DAO methods, it would result in significant code duplication.

Sorting the query s results works the same way in Hibernate as it would with SQL. The criteria query API provides the org.hibernate.criterion.Order class to sort your result set in either ascending or descending order according to one of your object s properties. Create an Order object with either of the two static factory methods on the Order class: asc() for ascending or desc() for descending. Both methods take the name of the property as their only argument. After you create an Order, use the addOrder() method on the Criteria object to add it to the criteria query. This example demonstrates how you would use the Order class: Criteria crit = session.createCriteria(Product.class); crit.add(Restrictions.gt("price",new Double(25.0))); crit.addOrder(Order.desc("price")); List results = crit.list(); You may add more than one Order object to the Criteria object. Hibernate will pass them through to the underlying SQL query. Your results will be sorted by the first order, then any identical matches within the first sort will be sorted by the second order, and so on. Hibernate passes the property value to SQL, after getting the proper database column name for the property.

When we were discussing the Set interface we mentioned that it was ideal for preventing duplicates. What we meant was that the Set datatype in Java does not allow them. We didn t really say anything

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