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Manual
15

JPA Primary Key

64 bit number (long) that is set automatically by ObjectDB for every new entity object that is stored ... key field: @Entity public class Project { @Id @GeneratedValue long id; // still set ... value generation is discussed in detail in the Generated Values section. Application Set Primary Key
Result
15

ObjectDB Object Database Features

ObjectDB provides a rich set of features. Many features are implemented as part of ObjectDB's ... . Persistence is set using JPA/JDO annotations (e.g. @Entity, @Id, @Index). Transparent activation ... .lang.BigDecimal. Collection types: Collection, List, Set, ArrayList, Vector, Stack, LinkedList
Manual
14

WHERE clause (JPQL / Criteria API)

language from a specified set of languages: SELECT c, l FROM Country c JOIN c.languages l WHERE c ... Queries The CriteriaQuery interface provides two where methods for setting the WHERE clause. Single ... the WHERE clause content (overriding previously set WHERE content if any). For example, the following JPQL
Manual
14

SELECT clause (JPQL / Criteria API)

query API provides several ways for setting the SELECT clause. Single Selection Setting a single ... .get("currency")).distinct(true); The select method takes one argument of type Selection and sets it as the SELECT clause content (overriding previously set SELECT content if any). Every valid criteria API
JDO Doc
13

javax.jdo.Query

to prepare and optimize an execution plan. Since: JDO 1.0 void declareImports(String imports) Set the import statements to be used to identify the fully qualified name of variables or parameters. Set ... is executed with the parameters set by the Map values. Each Map entry consists of a key which is the name
JDO Doc
13

javax.jdo.PersistenceManager

are subject to eviction based on the RetainValues setting. Since: JDO 1.0 See Also: evict(Object pc ... . If exceptions occur during flush, the implementation will set the current transaction's ... the copyOnAttach setting. Gets the copyOnAttach setting. Returns: the copyOnAttach setting. Since: JDO 2.1
Manual
12

Comparison in JPQL and Criteria API

ObjectDB supports two sets of comparison operators, as shown in the following table:   Set 1 - JPQL / SQL Set 2 - Java / JDO Less Than < < Greater Than > > Less Than or Equal To <= <= Greater Than or Equal To >= >= Equal = == Not Equal <> != The two sets differ in the Equal and the Not Equal
Manual
12

Deleting JPA Entity Objects

, which is another entity class. Due to the CascadeType.REMOVE setting, when an Employee instance is removed the operation ... . The difference between the two settings is in the response to disconnecting a relationship. For example, such as when setting the address field to null or to another Address object. If orphanRemoval=true
Manual
12

GROUP BY and HAVING clauses

for setting the GROUP BY and HAVING clauses. For example, the following JPQL query: SELECT c ... of expressions in another form of groupBy). Setting a HAVING clause is very similar to setting a WHERE clause ... (and uses an AND conjunction). When a groupBy or a having method is invoked, previously set values (if any) are discarded.
Tutorial
12

Java EE 6 JPA Tutorial - IntelliJ Project

the Server: Select File > Settings > Application Servers. Add Tomcat 6 Server if not set already (Tomcat ... at the toolbar and click the green run icon (or Shift+F10). If the browser fails to open check the settings at File > Settings > Web Browsers.