ObjectDB Database Search

The ORDER BY clause specifies the order for the query results. Any JPQL query that does not include an ORDER BY clause returns results in an undefined and non-deterministic order . ORDER BY ... , ordered by country name: SELECT c.name FROM Country c WHERE c.population 1000000 ORDER BY c.name

Jakarta Persistence (JPA) Interface jakarta.persistence.criteria. Order An object that defines an ordering over the query results. Since: Jakarta Persistence (JPA) 2.0 The ORDER BY clause (JPQL / Criteria API) article explains how to use Order . Public Instance Methods Expression getExpression

orderBy (    Order ... o ) Specify the ordering expressions that are used to order the query results. Replaces the previous ordering expressions, if any. If no ordering expressions are specified, the previous ordering , if any, is simply removed, and results will be returned in no particular

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria. Order Order reverse() Switch the ordering . Returns: a new Order instance with the reversed ordering . Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria. Order boolean isAscending() Whether ascending ordering is in effect. Returns: boolean indicating whether ordering is ascending. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria. Order Expression getExpression() Return the expression that is used for ordering . Returns: expression used for ordering . Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria. Order Nulls getNullPrecedence() Return the precedence of null values. Returns: the precedence of null values . Since: Jakarta Persistence (JPA) 3.2

when ordering the results of some projection when the order by expression is different (though logically ... ;  + " order by s_location.id asc";         ... ;  + " order by s.location.id asc";        

performance I noticed a strange behaviour where an ORDER BY - directive isn't executed as it should be (and usually is, except in this special combination-case). Ordering seems to be ignored if we order by a simple member (e.g. a String) being the Entity-ID and, at the same time, filter

and ordering , mirroring the SELECT and ORDER BY clauses in JPQL or SQL. These interfaces allow you to specify ... class). For more information, see the SELECT in Criteria Queries section. ORDER BY clause elements Result ordering is represented by: Specifies an ordering on a query expression, supporting

NoDefaultListenersForThisEntityEither extends NoDefaultListenersForThisEntity { } Callback invocation order When multiple callback methods are defined for a single lifecycle event, JPA invokes them in the following order : External ... classes. The invocation order for listeners is as follows: default listeners, listeners

have to be an entity. To remove elements from a collection, use the Edit Delete command. To change the order of elements in an ordered collection, use the Edit Move Element commands. Saving changes The Explorer ... and in what order . This is useful when working with classes that have many fields

...]] [ ORDER BY ...] The SELECT and FROM clauses are required in every query that retrieves data; update ... , HAVING , and ORDER BY are optional. The structure of JPQL DELETE and UPDATE queries is simpler: DELETE ... , max , ...) Criteria ORDER BY ( orderBy , Order , asc , desc )

is an ordered map data structure that ObjectDB maintains in the file system, not in memory. The B ... scan instead of iterating over all entities. Furthermore, if the field order in the index definition matches the field order in the WHERE clause, ObjectDB can perform a more efficient range scan

predicate. Since: Jakarta Persistence (JPA) 1.0 List getOrderList () Return the ordering expressions in order of precedence. Returns empty list if no ordering expressions have been specified. Modifications to the list do not affect the query. Returns: the list of ordering expressions

, you can set the order of the retrieved owner entities by using the @OrderBy annotation: @Entity ... Employee e WHERE e.department = :d ORDER BY e.name The specified field ( "name" ) must be a sortable

JPQL and criteria queries are built on query expressions. Every query consists of clauses , such as SELECT , FROM , WHERE , GROUP BY , HAVING , and ORDER BY . Each clause is composed of JPQL or ... operators, listed in order of decreasing precedence: Navigation operator ( . ) Arithmetic operators

. Represents an attribute typed as a java.util.Set , implying unique elements without a specific order . Represents an attribute typed as a java.util.List , supporting ordered collections and index-based

A prior knowledge of database programming (SQL, JDBC, ORM or JPA) is not required in order to follow ... . Further Reading and Resources This guide focuses mainly on practical issues in order to make the reader

intellectual property infringement. In order to qualify, an Indemnified Contributor must: a) promptly notify ... . Everyone is permitted to copy and distribute copies of this Agreement, but in order to avoid inconsistency

the ordering and mapping of collection-based relationships using these annotations: Specifies the ordering of elements in a List-valued association at the time of retrieval. Specifies the attribute

ordering and aggregate calculations . Lazy/Eager Loading Automatic pre-loading optimizations ... ). ORDER BY (including ASC, DESC). Aggregates (COUNT, SUM, AVG, MAX, MIN). Query Expressions Path

BY and HAVING clauses ( groupBy , having , count , sum , avg , min , max , ...) ORDER BY clause ( orderBy , Order , asc , desc ) The links above go to the Criteria query sections within pages

. Using primary keys for object clustering Entities are physically stored in the database ordered by ... ; : } @Embeddable public class EventId { int sensorId; Date time; } Because entities are ordered in

criteria queries, compound selections, expressions, predicates, orderings . Note that Predicate is used instead of Expression in this API in order to work around the fact that Java generics are not ... . Since: Jakarta Persistence (JPA) 3.2 Order asc ( Expression expression ) Create an ordering by

: Annotation Target: Method, Field Specifies the ordering of the elements of a collection-valued ... of the value ordering element is an orderby_list , as follows: orderby_list ::= orderby_item ... (ascending order ) is assumed. If the ordering element is not specified for an entity association

: Annotation Target: Method, Field Specifies a column that is used to maintain the persistent order of a list. The persistence provider is responsible for maintaining the order upon retrieval and in the database. The persistence provider is responsible for updating the ordering upon flushing

, LOWER, MAX, MEMBER, MIN, MOD, NEW, NOT, NULL, NULLIF, OBJECT, OF, OR, ORDER , OUTER, POSITION, SELECT

the query clauses. Elements used to define the SELECT and ORDER BY clauses. Elements for the FROM

order to interact with a relational database such as Oracle, DB2, SQL Server or MySQL. The popular JPA

cannot include multiple variables, JOIN clauses, or the GROUP BY , HAVING , and ORDER BY clauses

that ability and require multiple tables, multiple records and join operations in order to support

to define SELECT, WHERE , GROUP BY , and ORDER BY clauses. To execute the query, pass the instance

for all its parameters. The order in which you set the parameters does not matter. Ordinal

. However, they do not support the GROUP BY , HAVING , and ORDER BY clauses. For example, the following

by all six comparison operators and used for ordering . Navigation through path expressions A path

a column that is used to maintain the persistent order of a list. Inheritance mapping Define

The GROUP BY clause groups query results. A JPQL query with a GROUP BY clause returns properties of the resulting groups instead of individual objects and fields. In the query execution order , the GROUP BY clause is processed after the FROM and WHERE clauses but before the SELECT clause

clauses: SELECT , FROM , WHERE , GROUP BY , HAVING , and ORDER BY : The next section explains

.createNativeQuery( "SELECT o.id AS order _id, " + "o.quantity AS order _quantity, " + "o.item AS order _item, " + "i.name AS item_name, " + "FROM Order o, Item i " + "WHERE ( order _quantity 25) AND ( order _item = i.id)", "OrderResults"); @SqlResultSetMapping( name = "OrderResults", entities

.createNativeQuery( "SELECT o.id AS order _id, " + "o.quantity AS order _quantity, " + "o.item AS order _item, " + "FROM Order o, Item i " + "WHERE ( order _quantity 25) AND ( order _item = i.id)", "OrderResults ... . Order .class, fields = { @FieldResult(name = "id", column = " order _id"), @FieldResult(name = "quantity

query or stored procedure. Example: Query q = em.createNativeQuery( "SELECT o.id AS order _id, " + "o.quantity AS order _quantity, " + "o.item AS order _item, " + "i.name AS item_name, " + "FROM Order o, Item i " + "WHERE ( order _quantity 25) AND ( order _item = i.id)", "OrderResults

Set getOrders() { return orders ; } // In Order class: @ManyToOne @JoinColumn(name = "CUST_ID ... without using generics // In Customer class: @OneToMany(targetEntity = com.acme. Order .class, cascade = ALL, mappedBy = "customer") public Set getOrders() { return orders ; } // In Order class

This tutorial demonstrates how to create reports based on data in an ObjectDB database using the popular open source Business Intelligence and Reporting Tools (BIRT). In order to keep things as simple as possible - we will use the basic  points.odb ObjectDB database file from the Getting

Tutorial Only basic Java experience is required in order to follow this tutorial. Web Application

getAllGuests() { TypedQuery query = em.createQuery( "SELECT g FROM Guest g ORDER BY g.id", Guest.class

() { TypedQuery query = em.createQuery( "SELECT g FROM Guest g ORDER BY g.id", Guest.class); return

In this step we will add code to the Main class (that was generated with the project) in order to store Point objects in the database and then retrieve them from the database. Use copy and paste to replace the content of the Main class with the following content: package tutorial; import javax

getAllGuests() { TypedQuery query = em.createQuery( "SELECT g FROM Guest g ORDER BY g.id", Guest.class); return

Guest g ORDER BY g.id", Guest.class); return query.getResultList(); } } The GuestDao session bean (EJB