ObjectDB Database Search

how whitespace should be trimmed ( LEADING , TRAILING , or BOTH ). For more details and examples , see the Query Expressions section in the ObjectDB manual.

Callback methods are user-defined methods that are attached to entity lifecycle events. JPA invokes these methods automatically when the corresponding events occur. Internal callback methods Internal callback methods are defined within an entity class. For example , the following entity class

indicated by a copyright notice that is included in or attached to the work (an example is provided

the connection URL is resolved relative to the data path. For example , objectdb://localhost/my/db

, cache usage, or fetch graphs. For details and examples , see the JPA Named Queries section

, Boolean expressions are represented by the Expression interface and its descendants. For example

. For more information on the hierarchy and usage examples , see the Metamodel Attribute Interface Hierarchy section.

explanation of the type interface hierarchy and examples , see the Metamodel Type Interface Hierarchy section.

: Represents a query embedded within another query (for example , inside a WHERE clause). Unlike a top-level

and properties), covering singular, plural (collection), and map attributes. For detailed examples

} } em. getTransaction (). commit (); In the preceding example , all the Point objects whose x coordinate

subdirectory. However, moving objectdb.jar changes the value of $objectdb . For example , in a web application

method for instances of serializable types that are otherwise non-persistable (for example , a user

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

, represents entities that have been disconnected from an EntityManager . For example , all the managed

and other Fetch instances. For more details and an example , see the FROM in Criteria Queries section.

when an optimistic locking conflict occurs (for example , a version mismatch). This indicates

the example , SSL is disabled by default. Enable SSL when accessing remote ObjectDB databases

(for example , PrePersist and PostLoad ). Specifies that the default listeners defined for the persistence

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

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