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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

http://axion.tigris.org/

$Id: datatypes.html,v 1.9 2007/11/15 15:09:27 rwald Exp $

Published 15 Nov 2007 at 3:07 PM GMT.