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Axion: Data Types

Axion does not limit the user to a set of predefined data types. Instead, the user can easily plug in new data types and extend or change the names of registered data types. Any class that implements org.axiondb.DataType and for which there is a corresponding DataTypeFactory can be dropped right into Axion via a configuration file. The org.axiondb.types package has quite a few examples. The mappings between registered data types and the associated Java classes is defined in the axiondb.properties file.

By default, the following data types are registered:

Name

Range / Description

Implemented by (org.axiondb.types.__ )

 

Characters

 

char

same as java char type

CharacterType

varchar, varchar2, string

same as java String type

StringType

clob

Character Large Object (CLOB)

LOBType

compressedclob

Compressed CLOB  

CompressedLOBType

     
 

Numbers (Integer)

 

integer, int

-2,147,483,648 .. 2,147,483,647

IntegerType

long

-9,223,372,036,854,775,808 .. 9,223,372,036,854,775,807

LongType

byte

-128 .. +127

ByteType

short

-32,768 .. 32,767

ShortType

unsignedinteger

0 .. 4294967296

UnsignedIntegerType

unsignedshort

0 .. 65536

UnsignedShortType

unsignedbyte

0 .. 255

UnsignedByteType

number

Signed decimal number with unlimited precision based on java.lang.BigDecimal. Scale is currently limited to 2. Example: -12,313,452,312,324,234.34

BigDecimalType

     
 

Numbers (float)

 

float

-3.40282347e+38 .. +3.40282347e+38 ..

FloatType

     
 

Date / Time

 

date, time, timestamp

same as java.sql.TimesStamp

TimestampType

     
 

Other

 

boolean

false, true

BooleanType

Java_Object

 

ObjectType

varbinary

 

VarBinaryType

blob

Binary Large Object (BLOB)

LOBType

compressedblob

Compressed BLOB;

CompressedLOBType

To register other names for these types, e.g. 'bit' or 'memo', add the following lines to axiondb.properties:

type.bit=org.axiondb.BooleanType
type.memo=org.axiondb.LOBType


Axion - Open Source Java Database Engine
$Id: datatypes.html,v 1.9 2007/11/15 15:09:27 rwald Exp $
Published 15 Nov 2007 at 3:07 PM GMT.