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42

Database Schema Evolution

int to Date) the fields are not considered as matching and the new field is initialized ... to any numeric type. In this context numeric types are: byte, short, char, int, long, float, double ... long as the elements are convertible (e.g. from int[] to ArrayList). From any object to any
41

How to convert a boolean to an int in the query?

How to convert a boolean to an int in the query? I have five parameters of type boolean in ... for your help galandor Orlov Sergey Consider adding an int field to your entity class, that will sum them. You can calculate it in a JPA lifecycle event. Currently you cannot convert boolean to int in
37

JPA Persistable Types

: boolean, byte, short, char, int, long, float and double. Equivalent wrapper classes from package
26

[ODB1] Chapter 7 - JDOQL Queries

exists but its type cannot be compared with an int value, a JDOUserException is thrown. If the query ... objects can be obtained using the size() method: int count = result.size(); Iteration ... class contains a field with the name age and a type comparable to int. This section describes
18

JPA Entity Fields

(which only affects persistence): @Entity public class EntityWithTransientFields { static int transient1; // not persistent because of static final int transient2 = 0; // not persistent because of final transient int transient3; // not persistent because of transient @Transient int
16

Step 2: Define a JPA Entity Class

id; private int x; private int y; public Point() { } Point(int x, int ... id; } public int getX() { return x; } public int getY
16

Step 2: Define a JPA Entity Class

@GeneratedValue private long id; private int x; private int y; public Point() { } Point(int x, int y) { this.x = x; this.y = y; } public Long getId() { return id; } public int getX() { return x; } public
16

Defining a JPA Entity Class

; @Entity public class Point { // Persistent Fields: private int x; private int y; // Constructor: Point (int x, int y) { this.x = x; this.y = y; } // Accessor Methods: public int getX() { return this.x; } public int getY() { return this.y
15

JPA Primary Key

: boolean, byte, short, char, int, long, float, double. Equivalent wrapper classes from package java ... (ProjectId.class) public class Project { @Id int departmentId; @Id long projectId ... fields and its objects can represent primary key values: Class ProjectId { int departmentId
15

[ODB1] Chapter 3 - Persistent Classes

are also persistent types: All the primitive types - boolean, byte, short, char, int, long, float and double. Selected ... fields (persistent fields of types like int[] or Object[]). Any class in which a persistent array ... is changed, if casting of the old value to the new type is valid in Java (for example from int

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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