81 | Problem with distinct select, order by and equivalent alias/attribute path real sense to me switching from alias to attribute path between projection and order by part... bklink Benjamin Klink |
81 | Can't get arraylist/vector type attributesI have a class that contains some attributes of type Vector (also tried with ArrayList and same happens). When I try to get an object from that class doing using the find method it works fine, I get the object. But when I call the close method to close the EntityManager the information from |
81 | The attribute column name (EXCEPTION) is a reserved SQL-99 keyword.How do I fix this error/warning that Netbeans gives me? "The attribute column name (EXCEPTION) is a reserved SQL-99 keyword." ThreaT Ashton Hogan This warning indicates mapping to a field in the database that its name conflicts with SQL. This is not an issue with ObjectDB |
81 | is JDO field attribute "indexed" supported?. But there is another way which is to specify an indexed attribute on the field element, like <field name="foo |
81 | Remove an entity which attributes were changed - OptimisticLockExceptionWe use an OSGi environment and we have three OSGi plugins. In plugin A an entity is loaded and the entity is passed to plugin B. Plugin B changes an attribute on the entity. Plugin C removes the entity from the database. After commit the transaction an exception is caused with optimistic lock |
81 | Using of ConcurrentHashMap as attributeHello, it is possible to use an entity attribute of type java.util.concurrent.ConcurrentHashMap Your web site http://www.objectdb.com/object/db/database/features 'Object Model & Data Types' has no guidelines about this data type. Best regards btc_es BTC EmbeddedSystems You can persist a Map field |
81 | How to apply constraints in collection attributes of entity.How to apply constraints like unique, not null ...etc in collection attribute of a entity. Example : @Entity @Table(name = "agent") public class Agent implements Serializable { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long Id; private List<String |
16 | Remove an entity which attributes were changedWe use an OSGi environment and we have three OSGi plugins. In plugin A an entity is loaded and the entity is passed to plugin B. Plugin B changes an attribute on the entity. Plugin C removes the entity from the database. After commit the transaction an exception is caused with optimistic lock |
16 | Support Attribute Conversion for PersistenceThe @Converter annotation and the Attribute Converter interface have two big benefits: 1) They make it possible to persist any as-yet-unsupported java types that do not implement java.io.Serializable. (If they do, it is possible to persist them automatically by turning on the <persist serialization |
15 | Server Configuration how clients can connect to the server: The port attribute specifies a TPC port on which the server ... to the database (as explained in the JPA Overview section in chapter 3). The max attribute specifies the maximum ... . The <data> element <data path="$objectdb/db-files" /> The <data> element has one attribute |
