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The JPA Criteria API provides an alternative way for defining JPA queries, which is mainly useful for building dynamic queries whose exact structure is only known at runtime. JPA Criteria API vs ... of using the criteria API is that errors can be detected earlier, during compilation

of the query result list and other factors. SELECT in Criteria Queries The criteria query API   ... ;(overriding previously set SELECT content if any). Every valid criteria API expression can be used as selection, because all the criteria API expressions are represented by a sub interface

are considered as one group, and COUNT calculates its size). Criteria Query Paths and Types Paths and navigations are represented in the JPA Criteria API  by the Path interface and by ... . For example, the following criteria expression checks if the type of a specified entity e is not 

can be built using the criteria query API as follows: CriteriaQuery q = cb. createQuery (Country.class ... Criteria Queries The CriteriaQuery interface provides methods for setting the ORDER BY clause ... (c. get ("population"))); Unlike other methods for setting criteria query clauses - the orderBy

. Therefore, ABS, abs, Abs and aBs are all invalid variable names. FROM and JOIN in Criteria Queries FROM query identification variables are represented in criteria queries by sub interfaces of From ... interface (and its sub interfaces). Criteria Query Roots The CriteriaQuery 's from method serves as

can be built by using the criteria query API as follows: CriteriaQuery q = cb. createQuery (Country.class ... but they are especially dominant in the WHERE clause. WHERE in Criteria Queries The CriteriaQuery interface provides

Logical operators in JPQL and in JPA criteria queries enable composition of complex JPQL boolean ... part of its JDO support. Criteria Query Logical Operators Boolean Expressions and Predicates Boolean expressions are represented in criteria queries by Expression and descendant interfaces. For example

Explains how comparison operators can be used in JPQL queries, including in comparing null values.

: The JPA Metamodel API may optionally be used with the JPA Criteria API . Many of the interfaces ... The JPA Metamodel API , which is introduced in JPA 2.0, enables examining the classes, fields and properties of the persistent object model, similarly to the Java reflection API . The main interface

variant is valid because it introduces the Country class to ObjectDB. Dynamic JPQL, Criteria API ... can be built dynamically at runtime. The JPA Criteria API provides an alternative way for building dynamic

The JPA Criteria API interfaces in this group are used for setting the SELECT and ORDER BY clauses ... clause in a criteria query is represented by Selection : Because Selection  is a super interface of Expression , any criteria expression  can be used as the SELECT clause content. Multiple

well as how to use the JPA Criteria API , which provides an alternative way for building queries in JPA, based on JPQL. The first section describes the API that JPA provides for using dynamic and static ... (and a criteria query) is explained by describing the main clauses of JPQL queries (SELECT, FROM, WHERE, GROUP

The Java Persistence API (JPA) is a standard API for accessing databases from within Java applications. The main advantage of JPA over JDBC (the older Java API for interacting with databases ... of the Java Persistence API (JPA). By interacting with ObjectDB using standard JPA

The JPA Metamodel API provides the ability to examine the persistent object model and retrieve ... Metamodel API is Metamodel . It can be obtained either by the EntityManagerFactory 's getMetamodel ... the specified type to ObjectDB. Type Interface Hierarchy Types are represented in the Metamodel API by

The following interfaces and enum types represent attributes (persistent fields and properties) in the JPA Metamodel API : See the Metamodel Attribute Interface Hierarchy section for more details and examples.

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

All about ObjectDB API Reference in Java/JPA database - explanations, examples, references, links and related information.

All about ObjectDB APIs in Java/JPA database - explanations, examples, references, links and related information.

Query expressions are the foundations on which JPQL and criteria queries are built. Every query ... of JPQL / Criteria query expressions. Atomic Expressions The atomic query expressions are: JPQL / Criteria Variables JPQL / Criteria Parameters JPQL / Criteria Literals Every query expression consists

criteria query clauses are provided as follows: Criteria SELECT  ( select , distinct , multiselect , array , tuple , construct ). Criteria FROM  ( from , join , fetch ). Criteria WHERE  ( where ). Criteria GROUP BY / HAVING  ( groupBy , having , count , sum , avg , min , max

The interfaces in this group are in use for setting a criteria query FROM clause. Criteria Query ... variables are represented in criteria queries by descendant interfaces of the From interface: Range ... and its descendant interfaces: See the FROM in Criteria Queries section for more details

expressions (which are more powerful than the LIKE operator). Criteria Query String Expressions JPQL string operators and functions (which are described above) are available also as JPA criteria query ... order to support optional arguments and when applicable simple Java objects as well as criteria expressions.

. Criteria Query Arithmetic Expressions JPQL arithmetic operators and functions (which are described above) are available also as JPA criteria query expressions. The CriteriaBuilder interface provides ... must be a criteria numeric expression. The other operand may be either another numeric expression or a simple

to 0 . Date and Time in Criteria Queries The CriteriaBuilder interface provides three factory methods ... and time parts are also available in criteria queries by using the generic CriteriaBuilder 's function

are treated as synonyms. Criteria Query Collection Expressions JPQL collection operators and functions (which are described above) are available also as JPA criteria query expressions

The following interfaces are in use in representing general expressions in criteria queries: See the Query Expressions section for more details and examples.

. Criteria Query Literals The CriteriaBuilder interface provides two factory methods for building literal

;(e.g. "SELECT c FROM Country" ). Criteria Query API Building dynamic queries with a structure ... a TypedQuery or a Query instance. Building a dynamic query using the criteria API is managed by the  ... interface for using the criteria API is the CriteriaBuilder interface: A CriteriaBuilder instance

explicitly (except when using criteria API ), so query parameters are defined implicitly by ... that is built by using the JPA Criteria API - parameters (as other query elements) are represented by objects ... is designated for setting a parameter in a Criteria API query. The reason for having nine set methods

- older versions have a bug in the Criteria API implementation which prevents correct negation ... ;  * DataNucleus 2.2.2 - FAIL. Was not able to create even a simple query with Criteria API .    * ObjectDB 2.1.0 - FAIL. Does not support Criteria API :      java.lang

Criteria Query API . Static definition ( named queries ) in annotations (@NamedQuery) and XML. Query ... support of the JPA and JDO APIs . Fundamental features of relational databases (e.g. primary keys ... database files (the ObjectDB Doctor ). Standard Persistence APIs ObjectDB is the only Object-Oriented

using the criteria query API as follows: CriteriaQuery q = cb. createQuery (Country.class); Root c = q ... and HAVING in Criteria Queries The CriteriaQuery interface provides methods for setting the GROUP BY

that is specific to top-level queries. Since: JPA 2.0 The JPA Criteria API Queries article explains how to use ... . The type of the result of the query execution depends on the specification of the type of the criteria ... . The semantics of this method are as follows: If the type of the criteria query is CriteriaQuery (i.e

Criteria API Queries article explains how to use CriteriaBuilder . Public Methods Expression abs ... JPA Interface CriteriaBuilder Used to construct criteria queries, compound selections, expressions, predicates, orderings. Note that Predicate is used instead of Expression in this API in order

JPA Interface CriteriaDelete Type Parameters: - the entity type that is the target of the delete Super Interfaces: CommonAbstractCriteria The CriteriaDelete interface defines functionality for performing bulk delete operations using the Criteria API Criteria API bulk delete operations map directly

JPA Interface CriteriaUpdate Type Parameters: - the entity type that is the target of the update Super Interfaces: CommonAbstractCriteria The CriteriaUpdate interface defines functionality for performing bulk update operations using the Criteria API . Criteria API bulk update operations map

The Paths and Types in JPQL and Criteria API article explains how to use Path . Public Methods ... attribute. Note: Applications using the string-based API may need to specify the type resulting from

JPA Interface Selection Type Parameters: - the type of the selection item Super Interfaces: TupleElement The Selection interface defines an item that is to be returned in a query result. Since: JPA 2.0 The SELECT clause (JPQL / Criteria API ) article explains how to use Selection . Public Methods

JPA Interface Root Type Parameters: - the entity type referenced by the root A root type in the from clause. Query roots always reference entities. Since: JPA 2.0 The FROM clause (JPQL / Criteria API ) article explains how to use Root . Public Methods EntityType getModel () Return the metamodel

and Criteria API article explains how to use Predicate . Public Methods List getExpressions () Return

JPA Interface Order An object that defines an ordering over the query results. Since: JPA 2.0 The ORDER BY clause (JPQL / Criteria API ) article explains how to use Order . Public Methods Expression getExpression () Return the expression that is used for ordering. Return: expression used

JPA Interface Join Type Parameters: - the source type of the join - the target type of the join A join to an entity, embeddable, or basic type. Since: JPA 2.0 The FROM clause (JPQL / Criteria API ) article explains how to use Join . Public Methods Attribute getAttribute () Return the metamodel

: Applications using the string-based API may need to specify the type resulting from the get operation in

using the Java Persistence API (JPA). It is the first persistence solution that combined a powerful ... tutorial now...   Protect your investment. Use a standard Java API . ObjectDB became the first Object Oriented Database with built in support for the two standard Java database APIs : Java

: ObjectDB is unique in supporting the standard APIs . It is the only object database with built in support for the Java Persistence API (JPA). It also supports a more recent and advanced version of the Java Data Objects (JDO) API than competing object databases. By using a standard API such as JPA

You can use ObjectDB with either the Java Persistence API (JPA) or the Java Data Objects (JDO) API ... the primary API , and if necessary, switch to JDO as a secondary API for special additional features that are supported only by JDO. Selecting the more popular API leads to more portable application

that is common to both top-level criteria queries and subqueries as well as to update and delete criteria operations. It is not intended to be used directly in query construction. Note that criteria queries and criteria update and delete operations are typed differently. Criteria queries are typed

JPA Interface ParameterExpression Type Parameters: - the type of the parameter expression Super Interfaces: Expression , Parameter , Selection , TupleElement Type of criteria query parameter ... to this type. This method is required to be supported for criteria queries only. Applications

The JPA Criteria API supports dynamic definition of JPQL queries using CriteriaBuilder as ... Criteria API in expected in future versions. support Support   Implementation of the JPA Criteria ... ObjectDB version 2.2.0 was just released with full support of the JPA Criteria Query API , including

JPA Enum Constant in javax.persistence. criteria .Predicate$BooleanOperator AND Since: JPA 2.0