ObjectDB Database Search

Delete object from collection versus delete from JPQL

is not found. The third argument (when present) specifies from which position to start the search. LOWER ... Characters The TRIM([[LEADING|TRAILING|BOTH] [char] FROM ] str) function returns a string after removing ... to 'UK' . TRIM(LEADING FROM ' UK ') is evaluated to 'UK ' . TRIM(TRAILING FROM ' UK ') is evaluated

only once even if they are referenced multiple times. Referencing instances of other persistable types from ... . In most cases ObjectDB can overcome a missing no-arg constructor. Aside from these constraints ... , byte , short , char , int , long , float and double . Equivalent wrapper classes from package java

the use of the Service or from the Service infrastructure itself (for example, the duration of a page visit and user actions during page views). Website  refers to ObjectDB Website, accessible from ... where the data protection laws may differ than those from Your jurisdiction. Your consent to this Privacy

: - the source type of the join - the target type of the join Super Interfaces: From , Path , FetchParent ... Persistence (JPA) 2.0 The FROM clause (JPQL / Criteria API) article explains how to use Join . Public ... , an alias cannot be changed or reassigned. Returns the same selection item. Inherited from

: - the entity type referenced by the root Super Interfaces: From , Path , FetchParent , Expression , Selection , TupleElement A root type in the from clause. Query roots always reference entities. Since: Jakarta Persistence (JPA) 2.0 The FROM clause (JPQL / Criteria API) article explains how to use Root

persistent fields that are inherited from ancestor classes), is stored. When an entity object is stored in ... when a Department entity is retrieved from the database. ObjectDB accomplishes this by effectively running the following query (where :d represents the Department entity): SELECT e FROM Employee e WHERE e

) The following method retrieves a Country object from the database by its name: public Country getCountryByName( EntityManager em, String name) { TypedQuery query = em. createQuery ( "SELECT c FROM ... ( EntityManager em, String name) { TypedQuery query = em. createQuery ( "SELECT c FROM Country c

: SELECT c FROM Country c An equivalent query can be built using the JPA criteria API as follows ... ); Root c = q. from (Country.class); q. select (c); The CriteriaBuilder interface serves as the main ... for representing the built query. Then a Root  instance is created to define a range variable in the FROM

Existing entity objects can be deleted from the database either explicitly by invoking the remove ... an object from the database it has to first be retrieved (no matter which way) and then in an active ... object is physically deleted from the database when the transaction is committed. Embedded objects

objects in return: TypedQuery query = em. createQuery ("SELECT c FROM Country c", Country.class); List ... ) type: Query query = em. createQuery ("SELECT c FROM Country c"); List results = query ... that return a single result object. In this case, the result object has to be extracted from the result

Once an entity object is retrieved from the database (no matter which way) it can simply be modified in memory from inside an active transaction: Employee employee = em. find (Employee.class, 1); em ... can be cascaded from all the entity objects that have to be stored in the database, including from

additions to the Program originate from and are distributed by that particular Contributor. A Contribution 'originates' from a Contributor if it was added to the Program by such Contributor itself or ... , such as lost profits; iii) states that any provisions which differ from this Agreement are offered

an entity object that is already managed by the  EntityManager returns the existing instance from ... class which is not marked with @Cacheable inherits cacheability setting from its super class. Using ... . If an entity object is not available also in the shared cache - it is retrieved from the database and added

, derived attributes, grouping queries and aggregate queries) which are usually missing from Object Oriented ... can manage databases of various sizes efficiently, ranging from kilobytes to terabytes . Platform ... Recovery from failure by using a  recovery file and double writing. Additional recovery layer

are provided in the Storing Entities section. Entity objects retrieved from the database by ... . A managed entity object can also be retrieved from the database and marked for deletion, using the EntityManager’s remove method within an active transaction. The entity object changes its state from

that is absent from other object oriented databases. Entity Identification Every entity object in the database is uniquely identified (and can be retrieved from the database) by the combination of its type ... are deleted from the database. The primary key value of an entity can be accessed by declaring

resulting from mechanical transformation or translation of a Source form, including but not limited ... , that is based on (or derived from ) the Work and for which the editorial revisions, annotations ... . For the purposes of this License, Derivative Works shall not include works that remain separable from , or merely

classes from package java.lang: Byte , Short , Character , Integer , Long , Float , Double. java.math ... and range queries: SELECT p FROM Point p WHERE p.x = 100 SELECT p FROM Point p WHERE p.x BETWEEN 50 AND 80 SELECT p FROM Point p WHERE p.x = 50 AND p.x = 10 But this time a full index scan is required

the objectdb.jar file. You can run it from the command line as follows: $ java -cp objectdb.jar com ... and enhancer.sh on Unix/Linux) from the ObjectDB bin directory. To use that script you have to edit the paths ... so: Enhancement API The ObjectDB Enhancer can also be invoked from Java code: com.objectdb.Enhancer.enhance

query strings from the Java code. It also enforces the use of query  parameters ... : @NamedQuery ( name ="Country.findAll", query ="SELECT c FROM Country c") The  @NamedQuery annotation ... ", query ="SELECT c FROM Country c") public class Country { ... } Attaching multiple named queries

- after an entity has been retrieved from the database. @PreUpdate - when an entity is identified as modified by ... - after deleting an entity from the database (during commit or flush ). An entity class may include callback ... class and all its descendant classes from using the default listeners: @Entity

it from the command line as follows: $ java -jar explorer.jar If explorer.jar is not in the current ... ... command, specify a bookmark name and click OK . Bookmarked entity objects can be accessed from ... the object itself from the database. Editing Collections Elements can be added to collections by using

that corresponds to the specified name. Inherited from ManagedType Parameters: name - the name ... getAttributes () Return the attributes of the managed type. Inherited from ManagedType Returns: attributes ... of the represented entity or attribute is returned. Inherited from Bindable Returns: Java type

the attribute of the managed type that corresponds to the specified name. Inherited from ManagedType ... from ManagedType Returns: attributes of the managed type. Since: Jakarta Persistence (JPA) 1.0 ... attribute of the managed type that corresponds to the specified name and Java element type. Inherited from

can be used to fix the database. Recovery from failure is automatically applied by ObjectDB ... are generated by running the Activator utility: $ java -cp objectdb.jar com.objectdb.Activator from ... (when using the OEM license) are signed and excluded from evaluation restrictions. Therefore, when ObjectDB

query retrieves countries whose population and area (both) exceed specified limits: SELECT c FROM ... FROM Country c WHERE c.population :population OR c.area :area A valid operand of an OR operator ... c FROM Country c WHERE NOT (c.population :population) The operand of a NOT operator

, the configuration file is loaded from $objectdb/objectdb.conf where $objectdb represents the ObjectDB home ... ) is derived from the location of the objectdb.jar file. It is defined as the path to the directory in ... the configuration file is loaded from $objectdb/objectdb.conf . You can specify an alternative path by setting

only from the specified IP addresses. For instance, "127.0.0.1" (which represents the local machine), as ... . For example, a value "192.18.0.0-192.18.194.255,127.0.0.1" allows connecting from any IP address in the range of 192.18.0.0 to 192.18.194.255 , as well as from 127.0.0.1 . The admin attribute (whose value

are: The ability to access and use databases from different processes simultaneously. The ability to access ... Server tool is bundled in the objectdb.jar file. You can run it from the command line as follows ... .exe tries to locate and load the objectdb.jar from the same directory in which it is started. By

signature. This file is generated from the Keystore file by omitting the private key ... connections from any machine as long as a valid username and password are provided ... from the server Keystore) has to be installed on the client machine and its corresponding Trustore

, an alias cannot be changed or reassigned. Returns the same selection item. Inherited from Selection ... . Warning: may result in a runtime failure. Inherited from Expression Parameters: type - intended type ... required. Inherited from Expression Parameters: type - a basic type Returns: a scalar expression

of the managed type that corresponds to the specified name. Inherited from ManagedType Parameters ... Persistence (JPA) 1.0 Set getAttributes () Return the attributes of the managed type. Inherited from ... of the managed type that corresponds to the specified name and Java element type. Inherited from

to the specified name. Inherited from ManagedType Parameters: name - the name of the represented attribute ... the attributes of the managed type. Inherited from ManagedType Returns: attributes of the managed ... to the specified name and Java element type. Inherited from ManagedType Parameters: name - the name

if there is no existing node. Inherited from Graph Parameters: attributeName - name ... . Inherited from Graph Parameters: attribute - attribute Returns: the attribute node. Throws ... argument is ignored and has no effect. Inherited from Graph Parameters: attributeName - name

. Inherited from Graph Parameters: attributeName - name of the attribute Returns: the attribute node ... attribute, or add a new attribute node if there is no existing node. Inherited from Graph Parameters ... . Inherited from Graph Parameters: attributeName - name of the attribute Throws

. The getOutputParameterValue methods are used to retrieve the values passed back from the procedure ... that will be in effect during query execution. Inherited from Query Since: Jakarta Persistence (JPA) 3 ... execution. Inherited from Query Since: Jakarta Persistence (JPA) 3.2 int getFirstResult () The position

is useful for two different purposes: It enables recovery from a database failure by replaying ... . It can be run from the command line: $ java -cp objectdb.jar com.objectdb.Replayer my.odb If objectdb.jar

. Setting Query Hint (Scopes) Query hints can be set in the following scopes ( from global to local ... .findAll", query ="SELECT c FROM Country c",      hints ={@ QueryHint (name

to protect the Software from any use, reproduction, or distribution except specifically authorized ... all copies of the Software. This agreement will terminate immediately without notice from ObjectDB

is changed from the original name, which is specified by the required name attribute, to the new name ... attribute is specified the class name is changed from the original name, which is specified by

;(e.g. "SELECT c FROM Country" ). Criteria Query API Building dynamic queries with a structure ... are organized in this reference into three groups. SELECT and ORDER BY elements (including tuples): FROM clause

Point objects from the database: package com.objectdb.tutorial; import javax.persistence.Entity ... primary keys and automatic sequential value generation . This is a very powerful feature of ObjectDB that is absent from other object oriented databases.

of guests: List guestList = em.createQuery( "SELECT g FROM Guest g", Guest.class).getResultList ... is retrieved from the application scope attribute, and then an EntityManager (representing a database ... entity objects are retrieved from the database and stored in the request's "guest" attribute

getAllGuests() { TypedQuery query = em.createQuery( "SELECT g FROM Guest g ORDER BY g.id", Guest.class ... - for retrieving all the existing  Guest objects from the database. EJB classes are only supported by Java EE ... and Jetty. By using EJB classes we can move some work from the application to the EJB container (i.e

() { TypedQuery query = em.createQuery( "SELECT g FROM Guest g ORDER BY g.id", Guest.class); return ...   Guest objects from the database. By using Spring components we can move some work from

getAllGuests() { TypedQuery query = em.createQuery( "SELECT g FROM Guest g ORDER BY g.id", Guest.class); return ... all the existing  Guest objects from the database. By using Spring components we can move some work from

); } // Retrieves all the guests: public List getAllGuests() { TypedQuery query = em.createQuery( "SELECT g FROM ... . getAllGuests - for retrieving all the existing Guest objects from the database. EJB classes ... , such as Tomcat and Jetty. By using EJB classes we can move some work from the application to the EJB

.getTransaction().commit(); } // Display the list of guests: List guestList = em.createQuery( "SELECT g FROM ... on every http request: The EntityManagerFactory is retrieved from the application scope attribute ... is constructed and stored in the database. All the Guest entity objects are retrieved from the database

Explorer] window and selecting  New Data Source . Select ObjectDB Data Source from the list ... the database connection url: Download and save the points.odb  database file ( from the Quick