5 | Numbers in JPQL and Criteria Queries simple numeric values into a more complex expression. Arithmetic Operators The following arithmetic ... ) is evaluated to 2 (3 goes into 11 three times with a remainder of 2) MOD(8, 4) is evaluated to 0 (4 goes into |
4 | JPA Entity FieldsFields 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 | Detached Entity Objects 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 | JPA Queries 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 | Database Schema Evolution of an old schema is loaded into memory it is automatically converted into an instance of the up to date |
0 | Step 3: Define an EJB Session Bean 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 |
0 | Step 3: Define a Spring DAO Component 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 |
0 | [ODB1] Chapter 3 - Persistent Classes ANT for example), but in most Java IDEs a plugin is required to integrate a JDO enhancer into the IDE ... use of old schema instances. When an old instance is loaded into the memory it is automatically converted into an instance of the new up-to-date persistent class. The conversion is straightforward |
0 | javax.jdo.spi.PersistenceCapable.ObjectIdFieldManager number of the key field. Returns: the value of the field to be stored into the ObjectId. Since: JDO 1.0 ... : fieldNumber - the field number of the key field. Returns: the value of the field to be stored into ... to be stored into the ObjectId. Since: JDO 1.0 double fetchDoubleField(int fieldNumber) Fetch one field |
0 | javax.jdo.annotations.Column 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 |
