ObjectDB Database Search

The following interfaces and enum represent types in the JPA Metamodel API:  See the Metamodel Type Interface Hierarchy section for more details and examples .

Metamodel interface. For example : em. getMetamodel (). managedType (MyEntity.class); Following

, any field that is not declared as static or transient is a persistent field. For example

variables in the FROM clause: See the JPA Metamodel API page (in the ObjectDB manual) for more details and examples .

This chapter introduced the basic principles of JPA using ObjectDB. You can go into details by reading the other chapters of this manual. If you prefer to get started with ObjectDB right away you can follow one of the following tutorials to create and run the example program that was described in

entity } } em. getTransaction (). commit (); In the above example all the Point objects whose x

changes the value of $objectdb . For example , in a web application, in which objectdb.jar is located in

and runnable). You may use the following example as an initial template for your test case: package

. For example , a value "192.18.0.0-192.18.194.255,127.0.0.1" allows connecting from any IP address in

is not used when MapKeyClass is specified and vice versa. Example 1: @Entity public class Item { @Id int ... ; // map from image name to image filename ... } Example 2: // MapKeyClass and target type of relationship ... ; ... } Example 3: @Entity public class Company { @Id int id; ... @OneToMany(targetEntity = com. example

field. If no Column annotation is explicitly specified, the default values apply. Example 1: @Column ... ; } Example 2: @Column(name = "DESC", columnDefinition = "CLOB NOT NULL", table = "EMP_DETAIL") @Lob public String getDescription() { return description; } Example 3: @Column(name = "ORDER_COST", updatable

and the default values apply. Example 1: @Entity public class Company { @Id int id; ... @OneToMany ... ") Map organization; } Example 2: @Entity public class VideoStore { @Id int id; String name; Address ... ; ... } Example 3: @Entity public class Student { @Id int studentId; ... @ManyToMany // students and courses

notation is the name of the respective embedded field or property. Example 1: // In Customer class ... PhoneNumber class: @ManyToMany(mappedBy = "phones") public Set getCustomers() { return customers; } Example ... , mappedBy = "phones") public Set getCustomers() { return customers; } Example 3: // In Customer class

or property of an embeddable class which is not persistent. Example 1: @Embeddable public class ... ; ... } Example 2: @Embeddable public class PhoneNumber { protected String areaCode; protected String ... PhoneServiceProvider { @Id protected String name; ... } Example 3: @Embeddable public class Address { protected

the same as in the original mapping. Example 1: @MappedSuperclass public class Employee { @Id protected ... ) { ... } } Example 2: @Embeddable public class Address { protected String street; protected String city ... protected Address address; ... } Example 3: @Entity public class PropertyRecord { @EmbeddedId protected

property. Example 1: One-to-one association that maps a foreign key column // On Customer class: @OneToOne ... customer; } Example 2: One-to-one association that assumes both the source and target share the same ... Integer id; ... } Example 3: One-to-one association from an embeddable class to another entity. @Entity

, the cascade element and the orphanRemoval element apply to the map value. Example 1: One-to-Many ... ", nullable = false) public Customer getCustomer() { return customer; } Example 2: One-to-Many association ... ; } Example 3: Unidirectional One-to-Many association using a foreign key mapping // In Customer class

. Example 1: @Entity public class Course { ... @ManyToMany @OrderBy("lastname ASC") public List getStudents() { ... } ... } Example 2: @Entity public class Student { ... @ManyToMany(mappedBy = "students") @OrderBy // ordering by primary key is assumed public List getCourses() { ... } ... } Example 3

primary keys is not supported. Example 1: @Id @GeneratedValue(strategy = SEQUENCE, generator = "CUST_SEQ") @Column(name = "CUST_ID") public Long getId() { return id; } Example 2: @Id @GeneratedValue

it defaults to CLOB ; for all other types it defaults to BLOB . Example 1: @Lob @Basic(fetch = LAZY) @Column(name = "REPORT") protected String report; Example 2: @Lob @Basic(fetch = LAZY) @Column(name

and the default values apply. Example : @ManyToOne @JoinColumn(name = "ADDR_ID") public Address getAddress() { return address; } Example : unidirectional one-to-many association using a foreign key mapping // In

of the following: the name of the referencing relationship field or property; " _ "; " KEY ". Example : @Entity ... is parameterized by length, for example , varchar or varbinary types. Default: 255 Since: Jakarta

when MapKey is specified and vice versa. Example 1: @Entity public class Department { ... @OneToMany ... ") public Department getDepartment() { ... } ... } Example 2: @Entity public class Department

with the dot notation is the name of the respective embedded field or property. Example 1: @ManyToOne(optional ... getCustomer() { return customer; } Example 2: @Entity public class Employee { @Id int id; @Embedded JobInfo

. Relationship mappings defined within an embedded primary key type are not supported. Example 1: @Entity public ... empName, Date birthDay) {} Example 2: @Embeddable public class DependentId { String name; EmployeeId

annotation. Example 1: @Basic protected String name; Example 2: @Basic(fetch = LAZY) protected String

its join columns. Example 1: Overriding the mapping of a relationship defined by a mapped superclass ... { ... } Example 2: Overriding the mapping for phoneNumbers defined in the ContactInfo class @Entity public class

Jakarta Persistence (JPA) Annotation Type jakarta.persistence.SecondaryTables Implemented Interfaces: Annotation Target: Type Specifies multiple secondary tables for an entity. Example 1: Multiple ... _HIST")}) public class Employee { ... } Example 2: Multiple secondary tables with differently named

, and have the same names and types as the referenced primary key columns of the primary table. Example 1: Single ... { ... } Example 2: Single secondary table with multiple primary key columns. @Entity @Table(name

annotation. Example 1: @Entity public class Employee { ... @TableGenerator( name = "empGen", table ... ", allocationSize = 1) @Id @GeneratedValue(strategy = TABLE, generator = "empGen") int id; ... } Example 2

or field. Example : @Id public Long getId() { return id; } See Also: Column GeneratedValue

to be annotated. Example : @IdClass(EmployeePK.class) @Entity public class Employee { @Id String empName; @Id

the target database for foreign key constraint creation. For example , it might be similar to the following

) using an underscore. Example : @JoinTable( name = "CUST_PHONE", joinColumns = @JoinColumn(name = "CUST_ID

is used. Example : @Entity @Inheritance(strategy = JOINED) public class Customer { ... } @Entity public

specify both name and referencedColumnName . Example : @ManyToOne @JoinColumns({ @JoinColumn(name

, the enumerated type is assumed to be ORDINAL . Example : public enum ProjectStatus {COMPLETE, DELAYED, CANCELLED

with the ElementCollection , OneToMany , or ManyToMany annotation. Example : @OneToMany @MapKeyTemporal(DATE

specified. In this example , the parent entity has simple primary key: @Entity public class Employee

. Example : Concrete class as a mapped superclass @MappedSuperclass public class Employee { @Id

is retrieved for the constructed object. Example : Query q = em.createNativeQuery( "SELECT c.id, c.name

can be included in the query result by specifying this annotation in the metadata. Example : Query q = em

may be used to override mappings declared or defaulted by the embeddable class. Example : @Embedded

to DiscriminatorType.STRING . Example : @Entity @Table(name = "CUST") @Inheritance(strategy = SINGLE_TABLE

. The CollectionTable annotation specifies a mapping to a database table. Example : @Entity public class

, should be specified for each concrete entity class in the hierarchy. Example : @Entity @Table(name = "CUST

. Example : Query q = em.createNativeQuery( "SELECT o.id, o.quantity, o.item, " + "i.id, i.name, i

is permitted to eagerly fetch data for which the LAZY strategy hint has been specified. Example

the application to the Spring Framework. For instance, in this example the Spring container: Manages

the application to the Spring Framework. For instance, in this example the Spring container: Manages