ObjectDB Database Search

The GROUP BY clause enables grouping of query results. A JPQL query with a GROUP BY clause returns properties of generated groups instead of individual objects and fields. The position of a GROUP BY ... clause. When a GROUP BY clause exists in a JPQL query, database objects (or tuples of database objects

, derived attributes, grouping queries and aggregate queries) which are usually missing from Object Oriented ... groups . Ease of Use and Learning ObjectDB is very simple to use and is easier to learn than any ... to ObjectDB. Persistence is set using JPA/JDO annotations (e.g. @Entity , @ Id , @Index ). Transparent

superclasses) can be classified into the following five groups : Transient fields Persistent fields Inverse (Mapped By) fields Primary key ( ID ) fields Version field The first three groups (transient ... two groups (primary key and version fields) can only be used in entity classes. Primary key fields

server, IDs are allocated in groups . The number of IDs in each allocation is specified by ... number generator for every database. This number generator is used to generate automatic object IDs ... @GeneratedValue with the AUTO strategy: @Entity public class EntityWithAutoId1 { @ Id @GeneratedValue

something like this: SELECT COUNT( id ) FROM stats WHERE YEAR(record_date) = 2009 GROUP BY DATE_FORMAT(record_date ... Hi, I'm trying to create reporting query that will return entities grouped by year / mont / day ... () or DAY() in ODB. So, how to build queries similar to something like this: SELECT COUNT( id ) FROM stats

Jakarta Persistence (JPA) Annotation Type jakarta.persistence. Id Implemented Interfaces ... to which the Id annotation is applied should have one of the following types: any Java primitive type; any ... or field. Example: @ Id public Long getId() { return id ; } See Also: Column GeneratedValue

Jakarta Persistence (JPA) Field in jakarta.persistence.PersistenceConfiguration VALIDATION_ GROUP _PRE_PERSIST Target groups for validation at PrePersist . Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Field in jakarta.persistence.PersistenceConfiguration VALIDATION_ GROUP _PRE_UPDATE Target groups for validation at PreUpdate . Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Field in jakarta.persistence.PersistenceConfiguration VALIDATION_ GROUP _PRE_REMOVE Target groups for validation at PreRemove . Since: Jakarta Persistence (JPA) 1.0

the SEQUENCE or  TABLE  strategies, which support allocating a group of IDs in advance in ... , which relies on an "external" entity object having a non-null id after it has been passed ... up to another element) I am using the following for the ID : @ Id //@GeneratedValue(strategy = GenerationType.AUTO

BY c.name DESC Grouping ( GROUP BY) Order The ORDER BY clause is always the last in the query processing chain. If a query contains both an ORDER BY clause and a GROUP BY clause the SELECT clause receives groups rather than individual objects and ORDER BY can order these groups . For example: SELECT c

an object database, ObjectDB supports implicit object IDs , so an explicitly defined primary key is not ... a primary key field: @Entity public class Project { @ Id @GeneratedValue long id ; // still set automatically : } The @ Id annotation marks a field as a primary key field. When a primary key field is defined

;of up to 6 clauses in the following format: SELECT ... FROM ... [WHERE ...] [ GROUP BY ... [HAVING ... (update and delete queries have a slightly different form). The other JPQL clauses, WHERE , GROUP BY ... ;( where ). Criteria GROUP BY / HAVING  ( groupBy , having , count , sum , avg , min , max

. The SELECT clause counts all these objects (this is an aggregate query with no GROUP BY - all the objects are considered as one group , and COUNT calculates its size). Criteria Query Paths and Types Paths ... can be divided into two main groups : FROM variable expressions , represented by subinterfaces of From

() Return a list of the grouping expressions. Returns empty list if no grouping expressions ... : the list of grouping expressions. Since: Jakarta Persistence (JPA) 1.0 Predicate getGroupRestriction () Return the predicate that corresponds to the restriction(s) over the grouping items, or null

(JPA) 1.0 List getGroupList () Return a list of the grouping expressions. Returns empty list if no grouping expressions have been specified. Modifications to the list do not affect the query. Returns: the list of grouping expressions. Since: Jakarta Persistence (JPA) 1.0 Predicate

getGroupList () Return a list of the grouping expressions. Returns empty list if no grouping ... AbstractQuery Returns: the list of grouping expressions. Since: Jakarta Persistence (JPA) 1.0 Predicate getGroupRestriction () Return the predicate that corresponds to the restriction(s) over the grouping items

" + "WHERE o.cid = c. id " + " GROUP BY c. id , c.name", "CustomerDetailsResult"); @SqlResultSetMapping( name ... is retrieved for the constructed object. Example: Query q = em.createNativeQuery( "SELECT c. id , c.name ... , columns = { @ColumnResult(name = " id "), @ColumnResult(name = "name"), @ColumnResult(name

_TIMESTAMP,DELETE, DESC, DISTINCT, ELSE, EMPTY, END, ENTRY, ESCAPE, EXISTS, FALSE, FETCH,FROM, GROUP

Query expressions are the foundations on which JPQL and criteria queries are built. Every query consists of clauses - SELECT, FROM, WHERE, GROUP BY, HAVING and ORDER BY, and each clause consists of JPQL / Criteria query expressions. Atomic Expressions The atomic query expressions are: JPQL

are organized in this reference into three groups . SELECT and ORDER BY elements (including tuples): FROM clause

, and cannot include the GROUP BY, HAVING and ORDER BY clauses. A WHERE clause, which is essential

The JPA Criteria API interfaces in this group are used for setting the SELECT and ORDER BY clauses and for representing query results as tuples. SELECT Clause Elements The content of the SELECT clause in a criteria query is represented by Selection : Because Selection  is a super interface

comparison of any two values that belong to the same group as detailed above. Therefore, for example

JPA defines dozens of annotations that can be divided into the following groups : Annotations for JPA aware classes: Annotations for fields in JPA persistable classes: Annotations for additional JPA configuration: Annotations for JPA lifecycle event callbacks: Java EE container annotations: Many

UPDATE queries cannot include the GROUP BY, HAVING and ORDER BY clauses, but the WHERE clause

( where ). GROUP BY / HAVING clauses ( groupBy , having , count , sum , avg , min , max , ...). ORDER BY

A JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes, embeddable classes and mapped superclasses) with related settings. Defining a persistence unit is optional when using ObjectDB, but required by JPA. persistence.xml Persistence units are defined in

The interfaces in this group are in use for setting a criteria query FROM clause. Criteria Query Variables The FROM clause  in JPA queries (as in SQL) defines the query variables. Query variables are represented in criteria queries by descendant interfaces of the From interface: Range

(and a criteria query) is explained by describing the main clauses of JPQL queries (SELECT, FROM, WHERE, GROUP

= entityType. getSupertype (); // Checks if the type has a single ID attribute: boolean hasSingleId = entityType. hasSingleIdAttribute (); // Gets a single ID attribute - including inherited: SingularAttribute id1 = entityType. getId (Long.class); // Gets a single ID attribute - excluding 

groups JoinColumn annotations for the same relationship. Each JoinColumn annotation must explicit ... = "ADDR_ ID ", referencedColumnName = " ID "), @JoinColumn(name = "ADDR_ZIP", referencedColumnName = "ZIP

Interfaces: Annotation Target: Type, Method, Field Groups PrimaryKeyJoinColumn annotations. It is used ... ") @DiscriminatorValue("VCUST") @PrimaryKeyJoinColumns({ @PrimaryKeyJoinColumn(name = "CUST_ ID ", referencedColumnName = " ID "), @PrimaryKeyJoinColumn(name = "CUST_TYPE", referencedColumnName = "TYPE

of the database at the end of a specific transaction. The ID of that transaction is used as the name of the file. A recording file, with the same transaction ID in its name, contains database operations ... When a transaction ID is specified as a second argument the Replayer applies recorded operations

.ValidatorFactory , Since: Jakarta Persistence (JPA) 1.0 VALIDATION_ GROUP _PRE_PERSIST Target groups for validation at PrePersist . Since: Jakarta Persistence (JPA) 1.0 VALIDATION_ GROUP _PRE_REMOVE Target groups for validation at PreRemove . Since: Jakarta Persistence (JPA) 1.0 VALIDATION_ GROUP _PRE_UPDATE Target

Next . Enter Group Id (e.g.  Guestbook ), Artifact Id (e.g.  Guestbook ), Version (e.g

The configuration element supports renaming packages, classes and fields in ObjectDB databases as a complementary operation to renaming or moving these elements in the IDE during source code ... with persistable classes that have been renamed or moved in the IDE , with no matching schema configuration

We start by creating a new Maven web project in NetBeans: Open the [New Project] dialog box, e.g. by using File New Project... Select Maven Maven Web Application and click Next . Choose a Project Name (e.g. Guestbook ) and select Java EE 5. Enter Maven Group Id (e.g. com.objectdb.tutorial.spring

of the Eclipse IDE that includes BIRT built in. This option may be useful if you are not using the Eclipse IDE for Java EE Developers. Update your existing Eclipse IDE for Java EE Developers environment by installing the BIRT plugins  using the Eclipse Update Manager (updating Eclipse IDE

Serializable { private static final long serialVersionUID = 1L; @ Id @GeneratedValue private long id ... Long getId() { return id ; } public int getX() { return x; } public int getY() { return y; } @Override ... should represent Point objects in the database. Apart from the @Entity annotation and the id field

static final long serialVersionUID = 1L; @ Id @GeneratedValue private long id ; private int x; private ... () { return id ; } public int getX() { return x; } public int getY() { return y; } @Override public String ... objects in the database. Besides the @Entity annotation and the id field (and its annotations

.GeneratedValue; import javax.persistence. Id ; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @ Id @GeneratedValue Long id ; private ... and the id field (and its annotations) - the Guest class is an ordinary Java class. The next step is adding

; import javax.persistence.GeneratedValue; import javax.persistence. Id ; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @ Id @GeneratedValue Long id ; private String name; private Date signingDate; // Constructors: public

.GeneratedValue; import javax.persistence. Id ; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @ Id @GeneratedValue Long id ; private

. For this tutorial, besides the Java JDK (8 or above) and the Eclipse IDE (either Eclipse IDE for Java EE Developers or Eclipse IDE for Java Developers), you only need to download and extract the ObjectDB

; import javax.persistence. Id ; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @ Id @GeneratedValue Long id ; private String

.GeneratedValue; import javax.persistence. Id ; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @ Id @GeneratedValue Long id

.GeneratedValue; import javax.persistence. Id ; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @ Id @GeneratedValue Long id ; private String

/Guestbook/ You may also open and run the Maven project in your IDE : NetBeans IDE and IntelliJ IDEA have built in Maven support.

project in your IDE : NetBeans IDE and IntelliJ IDEA have built in Maven support.