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= em. createQuery (" SELECT c FROM Country c", Country.class); List results = query. getResultList ... the ability to use almost any valid JPQL expression in SELECT clauses. Specifying the required query ... the " SELECT  *" expression (which is commonly used in SQL). Projection of Path Expressions JPQL

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

JPA Enum Constant in javax.persistence.SharedCacheMode DISABLE _ SELECTIVE Caching is enabled for all entities except those for which Cacheable(false) is specified. Entities for which Cacheable(false) is specified are not cached. Since: JPA 2.0

JPA Method in javax.persistence.criteria.CriteriaQuery CriteriaQuery select (    Selection   selection ) Specify the item that is to be returned in the query result. Replaces the previously specified selection (s), if any. Note: Applications using the string-based API may need

to one of the following values: NONE - cache is disabled . ENABLE_ SELECTIVE - cache is disabled except for selected entity classes (see below). DISABLE _ SELECTIVE - cache is enabled except for selected ... MyCacheableEntityClass {     ... } Similarly, the DISABLE _ SELECTIVE value indicates that the cache

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

; Selection ...  selections ) Specify the selection items that are to be returned in the query result. Replaces the previously specified selection (s), if any. The type of the result of the query ... array-valued compound selection item. The semantics of this method are as follows: If the type

JPA Method in javax.persistence.criteria.CriteriaBuilder CompoundSelection array (    Selection ...  selections ) Create an array-valued selection item. Parameters: selections - selection items Return: array-valued compound selection Throws: IllegalArgumentException - if an argument is a tuple- or array-valued selection item Since: JPA 2.0

JPA Method in javax.persistence.criteria.CriteriaBuilder CompoundSelection tuple (    Selection ...  selections ) Create a tuple-valued selection item. Parameters: selections - selection items Return: tuple-valued compound selection Throws: IllegalArgumentException - if an argument is a tuple- or array-valued selection item Since: JPA 2.0

;Class  resultClass,     Selection ...  selections ) Create a selection item ... whose instance is to be constructed selections - arguments to the constructor Return: compound selection item Throws: IllegalArgumentException - if an argument is a tuple- or array-valued selection item Since: JPA 2.0

JPA Method in javax.persistence.criteria. Selection List getCompoundSelectionItems () Return the selection items composing a compound selection . Modifications to the list do not affect the query. Return: list of selection items Throws: IllegalStateException - if selection is not a compound selection Since: JPA 2.0

JPA Method in javax.persistence.criteria. Selection boolean isCompoundSelection () Whether the selection item is a compound selection . Return: boolean indicating whether the selection is a compound selection Since: JPA 2.0

JPA Method in javax.persistence.criteria. Selection Selection alias (   String name ) Assigns an alias to the selection item. Once assigned, an alias cannot be changed or reassigned. Returns the same selection item. Parameters: name - alias Return: selection item Since: JPA 2.0

JPA Method in javax.persistence.criteria.Subquery Subquery select (    Expression  expression ) Specify the item that is to be returned as the subquery result. Replaces the previously specified selection , if any. Parameters: expression - expression specifying the item

JPA Enum Constant in javax.persistence.SharedCacheMode ENABLE_ SELECTIVE Caching is enabled for all entities for Cacheable(true) is specified. All other entities are not cached. Since: JPA 2.0

Embedded...  command and select a local database file. To open a database in client-server mode select File Open C/S Connection...  and provide host, port, username and password for a client ... ] tabbed window or select an element for viewing (an entity class in the [Schema] tabbed window

clause in the query execution order is after the FROM and WHERE clauses, but before the SELECT ... ) are sent to grouping by the GROUP BY clauses before arriving at the SELECT clause. GROUP BY as DISTINCT (no Aggregates) The following query groups all the countries by their first letter: SELECT SUBSTRING(c

over all the Country objects in the database: SELECT c FROM Country AS c The AS keyword is optional, and the same query can also be written as follows: SELECT c FROM Country c By default, the name ... returns all the pairs of countries that share a common border: SELECT c1, c2 FROM Country c1, Country c2

is at least one million people, ordered by the country name: SELECT c.name FROM Country c WHERE c.population 1000000 ... produces objects for examination and the WHERE clause selects which objects to collect as results. Then the SELECT clause builds the results by evaluating the result expressions. Finally the results

, supported only on selected JVMs. The reflection attribute specifies how non enhanced classes ... is disabled by specifying 0 or 0mb . The element The hollow attribute of the element (whose value ... , could improve performance. However, for some applications disabling this ability could be more efficient

The WHERE clause adds filtering capabilities to the FROM- SELECT structure. It is essential in any JPQL query that retrieves selective objects from the database. Out of the four optional clauses ... : SELECT c FROM Country c WHERE c.population :p The FROM clause of this query defines an iteration

and easier to use in Java. JPQL Query Structure As with SQL, a JPQL SELECT query also consists of up to 6 clauses in the following format: SELECT ... FROM ... [WHERE ...] [GROUP BY ... [HAVING ...]] [ORDER BY ...] The first two clauses, SELECT and FROM are required in every retrieval query

"false" ) specifies if SSL is used. As shown above, SSL is disabled by default. It could be enabled ... the middle attack"). The server, on the other hand, might be less selective and allow connections

: 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 ... clause. Finally, the range variable, c , is also used in the SELECT clause as the query result

. When recording is enabled and recovery is disabled , recorded operations are used to automatically fix ... some ORM JPA providers) is defined in the entity class or not. It can be disabled by setting the 

. The size attribute specifies the maximum size of this list. This feature can be disabled by ... ( "" ) logging to file is disabled . Every day a new log file is generated with the name odb .log

The Query interface defines two methods for running SELECT queries: Query.getSingleResult ... : TypedQuery query = em. createQuery (" SELECT c FROM Country c", Country.class); List results = query ... = em. createQuery (" SELECT c FROM Country c"); List results = query. getResultList (); An attempt

Developers extension. To install it: Open the [Install] dialog box by selecting Help Install New Software ... and press ENTER. Select the ObjectDB Birt/ODA feature. Complete the installation by clicking Next twice ... ] window and selecting   New Data Source . Select ObjectDB Data Source from the list of available

: @NamedQuery ( name ="Country.findAll", query =" SELECT c FROM Country c") The  @NamedQuery annotation ... . But since the scope of named queries is the entire persistence unit, names should be selected ... ", query =" SELECT c FROM Country c") public class Country { ... } Attaching multiple named queries

identification variables and SELECT result variables. Parameters - when instances of these classes ... : SELECT c.name, c.capital.name FROM Country c The c  identification variable is used ... : SELECT COUNT(e) FROM Object e WHERE TYPE(e) Country Binding an identification variable ( e

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 ... for sorting results and for projection: SELECT MIN(p.x) FROM Point p WHERE p.x

DELETE queries provide an alternative way for deleting entity objects. Unlike SELECT queries ... . Selective Deletion The structure of DELETE queries is very simple relative to the structure of SELECT queries. DELETE queries cannot include multiple variables and JOIN, and cannot include the GROUP

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 ... added value to the clarity of the query string (assuming that meaningful names are selected

] dialog box, e.g. by using  File New Project... Select   Maven Maven Project and click  Next . Verify that the Create a simple project checkbox is disabled and click Next . Enter  maven-archetype-webapp as a filter, select   maven-archetype-webapp in the artifact list and click

) and selecting New Entity Class ... (or New Other... Persistence Entity Class and clicking Next ). Enter ... with a default persistence unit (that will be configured later). If the  Finish button is disabled ... clicking and selecting Edit or by double click and then moving to the Source or XML tab in

) and selecting   New Entity Class ... (or  New Other... Persistence Entity Class and clicking ... file with a default persistence unit (that will be configured later). If the Finish button is disabled ... a text editor (by right clicking and selecting Edit or by double click and then moving to the XML

toolbar button) and in the Open dialog box select the desired local database file and click the "Open ... " button that opens the "Remote File Selection " dialog box. Closing the Database Use the "File | Close ... is open. The "Class" window shows all the persistent classes in the database. You can select a class

zip file: Spring MVC JPA - Maven Project (8KB) Open the project in IntelliJ IDEA: Select   File Open Project... . Select the  guestbook-spring directory and click  OK . Define the Server: Select   File Settings Application Servers . Add Tomcat 6 Server if not set already (Tomcat

: Select File Open Project... . Select the guestbook-web directory and click OK . Define the Server: Select File Settings Application Servers . Add Tomcat 6 Server if not set already (Tomcat has to be downloaded separately). Define Run Configuration: Select Run Edit Configurations , click the + icon

the project in IntelliJ IDEA: Select   File Open Project... . Select the  guestbook-jee6 directory and click  OK . Define the Server: Select   File Settings Application Servers . Add ... : Select   Run Edit Configurations , click the  + icon and select   Tomcat Server Local

- you should be able to run your application now by selecting Run Run Main Project from the main menu (or F6 ): You can select the server in the Run category of the project properties window (right click the project node and select Properties to open it). Alternatively you can run the web application using

selecting Help Install New Software... In the [Work with] field enter the BIRT update site url. http ... /update-site/4.6  (Eclipse Neon, Oxygen) and press ENTER. Click the Select All button to select ... ] dialog box by selecting Help Install New Software... In the [Work with] field enter the ObjectDB

: Select File Import... Maven Existing Maven Projects and click Next . Select the points-console directory as Root Directory and press ENTER . Select the project and click  Finish . Run the project in Eclipse: Right click the project node and select Run As Java Application . Select Main - point and click OK .

) and selecting   New Class . Enter  guest as the package name - use  exactly that case ... node (in the [Project Explorer] window) and selecting New Folder (or  New Other... General Folder and clicking Next ). Select the project src folder as a parent folder, enter META-INF as a new

Eclipse: Select   File Import... Maven Existing Maven Projects and click  Next . Select the  guestbook-jee6 directory as Root Directory and press  ENTER . Select the project and click  Finish . Run the project in Eclipse: Right click the project node and select   Run As Run

the project zip file: Spring MVC JPA - Maven Project (8KB) Open the Maven project in Eclipse: Select   File Import... Maven Existing Maven Projects and click  Next . Select the  guestbook-spring directory as Root Directory and press  ENTER . Select the project and click  Finish

the project node (in the [Package Explorer] window), select   New Source Folder ... right clicking the new source directory node (in the [Package Explorer] window) and selecting   ... the [Project Explorer]) and select   New Folder. The parent folder should be resources. Enter META

NetBeans: Select File Open Project... . Select the points-console directory and click Open Project . Run the project in NetBeans: Select Run Run Main Project... (or F6 ). Click Select Main Class .

IntelliJ IDEA: Select File Open Project... . Select the points-console directory and click Open Project . Run the project in IntelliJ IDEA: Select Run Run Main Project... (or F6 ). Click Select Main Class .

, int , long , float and double . Selected classes in package java.lang : Boolean , Byte , Short , Character , Integer , Long , Float , Double , Number and String . Selected classes in package java ... user classes -d output path for enhanced classes -s include sub directories in search -noopt disable