14 | JPA Entity Fields provider (such as Hibernate) or to change default field settings. For example: @Entity public class ... . Cascade and fetch settings are explained in chapter 3. A persistent field whose type is embeddable ... ; } @Entity public class Department { @OneToMany(mappedBy="department") Set<Employee> employees |
13 | JPA Metamodel API to retrieve sets of types: // Get all the managed classes: // (entity classes, embeddable classes, mapped super classes) Set<ManagedType> allManagedTypes = metamodel.getManagedTypes(); // Get all the entity classes: Set<EntityType> allEntityTypes = metamodel.getEntities |
12 | BIRT/ODA ObjectDB Driver Tools (BIRT) that adds support of ObjectDB as a data source and JPQL as a data set query language ... Sets and JPQL To create the data set: Open the [New Data Set] dialog box by right clicking the Data Sets node in the [Data Explorer] window and selecting New Data Set. Select an ObjectDB data source |
12 | Locking in JPA - which represents an exclusive lock. Setting a Pessimistic Lock An entity object can be locked ... can be set to allow waiting for a pessimistic lock for a specified number of milliseconds. The hint can be set in several scopes: For the entire persistence unit - using a persistence.xml property |
11 | ObjectDB Object Database FeaturesObjectDB provides a rich set of features. Many features are implemented as part of ObjectDB's ... to ObjectDB. Persistence is set using JPA/JDO annotations (e.g. @Entity, @Id, @Index). Transparent ... and java.lang.BigDecimal. Collection types: Collection, List, Set, ArrayList, Vector, Stack |
11 | JPA Primary Key 64 bit number (long) that is set automatically by ObjectDB for every new entity object ... key field: @Entity public class Project { @Id @GeneratedValue long id; // still set ... value generation is discussed in detail in the Generated Values section. Application Set Primary |
10 | SELECT clause (JPQL / Criteria API) The criteria query API provides several ways for setting the SELECT clause. Single Selection Setting ... .get("currency")).distinct(true); The select method takes one argument of type Selection and sets it as the SELECT clause content (overriding previously set SELECT content if any). Every valid criteria |
10 | WHERE clause (JPQL / Criteria API) that exceeds a specified limit and also have an official language from a specified set of languages ... provides two where methods for setting the WHERE clause. Single Restriction The first where method takes one Expression<Boolean> argument and uses it as the WHERE clause content (overriding previously set |
10 | Chapter 6 - Configuration setting the "objectdb.home" system property: System.setProperty("objectdb.home", "/odb"); // new $objectdb As with any other system property it can also be set as an argument to the JVM ... file is loaded from $objectdb/objectdb.conf. You can specify an alternative path by setting |
1 | [ODB1] Chapter 5 - JDO Connections of the database requires an active transaction. The focus of this chapter is on setting up a runtime ... that are set in the code above are usually essential: javax.jdo.PersistenceManagerFactoryClass ... five optional modes for working with transactions, represented by five flags that can be set or cleared |
