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JPA Query Structure (JPQL / Criteria)

is that SQL works with relational database tables, records and fields, whereas JPQL works with Java ... rather than just field values from database tables, as with SQL. That makes JPQL more object oriented friendly

What is the Java Persistence API (JPA)?

) is that in JPA data is represented by classes and objects rather than by tables and records as in JDBC ... the relational database (as tables and records) and the representation in the Java application (as classes

ObjectDB - Object Database for Java (JPA/JDO)

conversions between graphs of Java objects and flat database table rows. Object Relational Mapping ... relational databases, JDBC, drivers, tables, records, ORM tools and mapping - start writing more effective


is specified for the GeneratedValue annotation. A table generator may be specified on the entity class or ... { ... @TableGenerator( name="empGen", table="ID_GEN ... _ID", allocationSize=1) @Id @GeneratedValue(strategy=TABLE, generator


) Specifies a mapping to an entity that is a map key. The map key join column is in the collection table, join table, or table of the target entity that is used to represent the map. If no MapKeyJoinColumn ... for the map key. The table in which it is found depends upon the context. If the join is for a map


javax.persistence Annotation SecondaryTable Target: Classes Specifies a secondary table for the annotated entity class. Specifying one or more secondary tables indicates that the data for the entity class is stored across multiple tables. If no SecondaryTable annotation is specified, it is assumed


get methods) Specifies a primary key column that is used as a foreign key to join to another table. It is used to join the primary table of an entity subclass in the JOINED mapping strategy to the primary table of its superclass; it is used within a SecondaryTable annotation to join a secondary table


) Specifies the table that is used for the mapping of collections of basic or embeddable types. Applied to the collection-valued field or property. By default, the columns of the collection table ... home; ... @ElementCollection // use default table (PERSON_NICKNAMES) @Column


) The name of the map key column. (Optional) The name of the map key column. The table in which it is found ... the collection table for the map value. If the map key is for a ManyToMany entity relationship or for a OneToMany entity relationship using a join table, the map key column is in a join table. If the map

Report Generation with BIRT and JPA

the BIRT report using a chart and a table: The tutorial consists of the following steps:

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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