 4 | of an old schema is loaded into memory it is automatically converted into an instance of the up to date |
4 | the database unless modified detached objects are merged back into an EntityManager to become managed ... detached entity object is copied into an existing managed entity object with the same identity (i.e |
4 | Fields of persistable user defined classes (entity classes, embeddable classes and mapped superclasses) can be classified into the following five groups: Transient fields Persistent fields Inverse ... ;
}
If a version field exists, ObjectDB automatically injects the version value into that field. Version fields |
4 | expressions in the above code can be divided into two main groups: FROM variable expressions, represented ... affect the built query directly. The constructed expression must be integrated into query clauses |
4 | the instantiation of the DAO component class and injects an instance of the DAO component class into the controller, as shown in the next step. Prepares an EntityManager automatically and injects it into the em |
4 | component class and injects an instance of the DAO component class into the controller, as shown in the next step. Prepares an EntityManager automatically and injects it into the em field |
4 | of the EJB class and injects an instance of the EJB class into the servlet (as shown in the next step). Prepares an EntityManager automatically and injects it into the em field (because it is annotated |
4 | : Manages the instantiation of the EJB class and injects an instance of the EJB class into the servlet (as shown in the next step). Prepares an EntityManager automatically and injects it into the em field |
4 | concatenating JPQL strings into a valid complete JPQL query. JPA 2 introduced the JPA Criteria Query API, as ... are equivalent). Criteria Query Elements Criteria query elements are organized in this reference into |
4 | allowsNull Whether the column allows null values to be inserted. Whether the column allows null values to be inserted. Returns: whether the column allows null values to be inserted Default value ... insertValue Value to be inserted when this is an "unmapped" column Value to be inserted |
