 19 | Unable to update a OneToMany Set |
18 | 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 |
18 | ObjectDB provides a rich set of features. Many features are implemented as part of ObjectDB's ... JPA is very simple, except for mapping, which is irrelevant to ObjectDB. Persistence is set using JPA ... types: Collection, List, Set, ArrayList, Vector, Stack, LinkedList, ArrayDeque, PriorityQueue |
16 | The criteria query API provides several ways for setting the SELECT clause. Single Selection Setting ... .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 |
16 | 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 |
15 | string resultSetMapping - the name of the result set mapping Returns: the new query instance Since: JPA ... . Transactional instances are subject to eviction based on the RetainValues setting. Since: JDO 1.0 ... call is made Since: JPA 2.0 boolean getCopyOnAttach() Gets the copyOnAttach setting. Gets the copyOnAttach setting |
15 | 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 |
15 | 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 |
14 | 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 |
14 | database. Setting a Master Database A master ObjectDB database is an ordinary database ... , but no other preparations or settings are required. Setting Slave Databases Setting slave databases is very easy |