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Tutorial
8

Step 2: Define a JPA Entity Class

; // Persistent Fields: @Id @GeneratedValue Long id; private String name; private Date signingDate; // Constructors: public Guest() { } public Guest(String name ... ()); } // String Representation: @Override public String toString() { return
Tutorial
8

Step 2: Entity Class and Persistence Unit

Long id; private String name; private Date signingDate; // Constructors: public Guest() { } public Guest(String name) { this.name = name; this.signingDate = new Date(System.currentTimeMillis()); } // String Representation
Tutorial
8

Step 2: Entity Class and Persistence Unit

; private String name; private Date signingDate; // Constructors: public Guest() { } public Guest(String name) { this.name = name; this.signingDate = new Date(System.currentTimeMillis()); } // String Representation: @Override public String
Tutorial
8

Step 2: Entity Class and Persistence Unit

Long id; private String name; private Date signingDate; // Constructors: public Guest() { } public Guest(String name) { this.name = name; this.signingDate = new Date(System.currentTimeMillis()); } // String Representation: @Override
Tutorial
8

Step 2: Entity Class and Persistence Unit

; // Persistent Fields: @Id @GeneratedValue Long id; private String name ... (String name) { this.name = name; this.signingDate = new Date(System.currentTimeMillis()); } // String Representation: @Override public String toString
Result
8

Posting to ObjectDB Website - Important Instructions

static void main(String[] args) {         EntityManagerFactory emf =             Persistence ... ();     }     @Entity     public static class MyEntity {         private String name;         MyEntity(String name) {             this.name = name;         }         @Override         public String toString
JPA Doc
8

JPA Queries

interface) is the only neccessary interface for defining and running string based JPQL queries (e.g ... concatenating JPQL strings into a valid complete JPQL query. JPA 2 introduced the JPA Criteria Query API, as ... query string (i.e. to a String instance containing JPQL). An essential interface for using
JDO Doc
8

javax.jdo.PersistenceManagerFactory

after close, then JDOUserException is thrown. Since: JDO 1.0.1 String getConnectionDriverName ... factory. Since: JDO 1.0 String getConnectionFactory2Name() Get the name for the second data store ... of the data store connection factory. Since: JDO 1.0 String getConnectionFactoryName() Get the name
Manual
7

Collections in JPQL and Criteria Queries

: ExpressionString>> languages = country.get("languages"); Expression<String> param = cb.parameter(String.class); // collection IS [NOT] EMPTY Predicate e1 = cb.isEmpty(languages
Manual
7

GROUP BY and HAVING clauses

of comparable values (numeric, strings, dates). MAX - returns the maximum of comparable values (numeric, strings, dates). The following query counts for every letter the number of countries ... contains the initial letter as a String object, the second cell contains the number of countries in