140 | Problem with Composite indices This uniqueness constraint has to be enforced by the application. Unfortunately a composite index on a field |
28 | JPA Composite Key make Object Db throws "Unexpected exception (Error 990)"Hello Object Db community :) I am using this wonderful library and I caught a strange exception while testing the "composite key" feature in JPA. Let's see what I am doing : @Entity public class Book { @EmbeddedId BookId id; } @Embeddable Class BookId { Integer bookIdCountry |
23 | Database Replication and Clustering should represent a user on the slave server rather than on the master server. Finally, a composite URL ... =b;password=b" ); A composite URL contains two or more database URLs separated by '|'. Usually |
16 | SELECT clause (JPQL / Criteria API) propagated to the database. Multiple SELECT Expressions The SELECT clause may also define composite |
16 | Is ObjectDB better than competing object databases? almost every application. ObjectDB supports user defined primary keys including composite primary keys. The support |
16 | Logical Operators in JPQL and Criteria APILogical operators in JPQL and in JPA criteria queries enable composition of complex JPQL boolean expressions out of simple JPQL boolean expressions. Logical Operators ObjectDB supports 2 sets of logical operators, as shown in the following table: Set 1 - JPQL / SQL Set 2 - Java / JDO AND && OR |
16 | Numbers in JPQL and Criteria Queries.g. LOCATE, LENGTH. as composite arithmetic expressions that use operators and functions to combine |
16 | Defining a JPA Entity Class, ObjectDB also supports explicit JPA primary keys, including composite primary keys and automatic |
16 | JPA Annotations for Classes are useful in representing composite primary keys as explained in the Primary Key section of the ObjectDB manual. |
10 | javax.persistence.MapsId. The value element specifies the attribute within a composite key to which the relationship attribute ... ; ... } // dependent entity uses EmbeddedId for composite key @Embeddable ... within the composite key to which the relationship attribute corresponds. (Optional) The name of the attribute |
