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54

Database Schema Evolution

to any numeric type. In this context numeric types are: byte, short, char, int, long, float, double, Byte, Short, Character, Integer, Long, Float, Double, BigInteger, BigDecimal and enum values
54

JPA Persistable Types

: boolean, byte, short, char, int, long, float and double. Equivalent wrapper classes from package java.lang: Boolean, Byte, Short, Character, Integer, Long, Float and Double. java.math.BigInteger
47

[ODB1] Chapter 7 - JDOQL Queries

, 0xFFFF, 07777, ... long 2003L, -127L, 0L, 0xFFFFL, 07777L, ... float 3.14F, 0f, 1e2f, -2.f, 5.04e+17f ... (Byte, Short, Character, Integer, Long, Float, Double), as well as BigInteger and BigDecimal can participate in comparisons as if they were primitive numeric types (byte, short, char, int, long, float
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Cannot sort descending, when ordering by caluculated float in a method

. public class InvoiceItem{     private float price;     private float amount;     .. } public class Invoice{     private List invoiceItemList;     ..     public Float getPrice(){         Float price = 0f;         if (invoiceItemList!=null) {             for(InvoiceItem ii
35

ObjectDB Object Database Features

(boolean, byte, short, char, int, long, float, double). Wrapper types (Boolean, Byte, Short, Character, Integer, Long, Float, Double). java.lang.String Date types: java.util.Date, java.sql.Date, java.sql ... a @EmbeddedId field. Primary Key Data Types Primitives (boolean, byte, short, char, int, long, float and double
35

[ODB1] Chapter 3 - Persistent Classes

are also persistent types: All the primitive types - boolean, byte, short, char, int, long, float and double. Selected classes in package java.lang: Boolean, Byte, Short, Character, Integer, Long, Float, Double, Number ... to float and from float to int) the old value is converted automatically to the new type. If casting
25

Index Definition

, float, double. Equivalent wrapper classes from package java.lang: Byte, Short, Character, Integer, Long, Float, Double. java.math.BigInteger, java.math.BigDecimal. java.lang.String. java.util.Date
25

JPA Primary Key

: boolean, byte, short, char, int, long, float, double. Equivalent wrapper classes from package java.lang: Byte, Short, Character, Integer, Long, Float, Double. java.math.BigInteger, java.math.BigDecimal
25

[ODB1] Chapter 4 - JDO Metadata

, short, char, int, long, float or double) embedded wrapper (Boolean, Byte, Short, Character, Integer, Long, Float or Double) embedded java.lang.String embedded java.util.Date external (non embedded
25

Comparison in JPQL and Criteria API

, char, int, long, float, double), wrapper types (Byte, Short, Character, Integer, Long, Float, Double

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.

Need Help?

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  2. Read the FAQ
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