OrientDB supports several types natively. Below the complete table

). Only the RecordIds are stored)s and are reachable only by navigating the owner Record)s and are reachable only by navigating the owner Record

Type	Description	Java type	**Size in storage (in bytes)**	Minimum	Maximum	**Auto-conversion from/to**	JSON format	Binary descriptor
String	Any string as alphanumeric sequence of chars	java.lang.String	variable 0-100,000	-	-	-	Test	Surrounded with double quotes. Example "Jay"
Byte	Single byte. Useful to store small integers with range -128 to +127	java.lang.Byte or byte	variable 0-4	-128	+127	Any Number, String	0	Value ends with 'b'. Example: 23b
Short	Small integers with range -32,768 to 32,767	java.lang.Short or short	variable 0-6 (it's transformed in String)	-32,768	32,767	Any Number, String	10000	Value ends with 's'. Example: 23s
Integer	Integers with range -2,147,483,648 to +2,147,483,647	java.lang.Integer or int	variable 0-11 (it's transformed in String)	-2,147,483,648	+2,147,483,647	Any Number, String	1000000	Just the value. Example: 234392
Long	Big integers with range -9,223,372,036,854,775,808 to +9,223,372,036,854,775,807	java.lang.Long or long	variable 0-20 (it's transformed in String)	-9,223,372,036,854,775,808	+9,223,372,036,854,775,807	Any Number, String	1000000000	Value ends with 'l'. Example: 23439223l
Float	Decimal numbers	java.lang.Float or float	variable 0-? (it's transformed in String)	1.4e-45f	3.4028235e+38f	Any Number, String	100000.33333	Value ends with 'f'. Example: 234392.23f
Decimal	Decimal numbers without rounding as for FLOAT and DOUBLE types. Perfect to handle money values	java.math.BigDecimal	variable 0-? (it's transformed in String)	4.9e-324	1.7976931348623157e+308	Any Number, String	100000000000.33333333	Value ends with 'c'. Example: 2343.9223c
Double	Decimal numbers with high precision	java.lang.Double or double	variable 0-? (it's transformed in String)	4.9e-324	1.7976931348623157e+308	Any Number, String	10000000000.33333333	Value ends with 'd'. Example: 1002020.2302d
Boolean	Handles only the values *True* or *False*	java.lang.Boolean or boolean	1	0	1	String	true	'true' or 'false'. Example: true
Date	Any date as year, month and day	java.util.Date	variable	-	-	Date, Long, String	1002020303	Value in milliseconds ends with 'a'. Example: 1002020303a
Datetime	Any date with the precision up to milliseconds	java.util.Date	variable	-	1002020303	Date, Long, String	1002020303	Value in milliseconds ends with 't'. Example: 1002020303t
Binary	Can contain any value as byte array	{{{byte[surrounded with "`_`". Example: `_`2332322`_`
Link	Link to another Record. It's a common [[]}}}	variable	0	2,147,483,647	String		Value|Concepts#onetooneonetoonerelationship]]. Only the RecordId is stored	ORecord<?> instance	0-24 variable (it's transformed in String)	-1:-1	32767:9223372036854775807	String	#10:3	Just the [RID](Concepts_RID). Example: #10:232
Link list	Links to other Records. It's a common One-to-Many relationship. Only the RecordIds are stored	List<? extends ORecord<?>>	variable	0	41,000,000 items	Collection extends ORecord>>, String	[#10:4](#10:3,)	Collections values separated by commas and surrounded by brackets "[ ]". Example: [
Link set	Links to other Records. It's a common [Concepts#One-to-Many One-to-Many relationship](#10:3,#10:6]
Set<? extends ORecord<?>>	variable	0	41,000,000 items	Collection extends ORecord>>, String	Collections values separated by commas and surrounded by brackets "[ ]". Example: [#10:4](#10:3,#10:6]	[#10:3,)
Link map	Links to other Records as value of the entries, while keys can only be Strings. It's a common One-to-Many relationship. Only the RecordIds are stored	Map<String, ? extends ORecord<?>>	variable	0	41,000,000 items	String	{ 'name' : '#10:3' }	Map entries separated by commas and surrounded by curly braces "{ }". Example: {'Jay':#10:3,'Mike':#10:6}
Embedded	The Record is contained inside the owner. The contained Record has no RecordId	ORecord<?> instance	variable (it's transformed in String)	-	-	ORecord>	{"Jay":"#10:3","Mike":"#10:6"}	Embedded document serialized surrounded by parenthesis "( )". Example: ({'Jay':#10:3,'Mike':#10:6})
Embedded list	The Records are contained inside the owner. The contained Records have no RecordIds and are reachable only by navigating the owner Record	List<Object>	variable	0	41,000,000 items	String	[20, 30](10,)	Collections values separated by commas and surrounded by brackets "[ ]". Example: [
Embedded set	The Records are contained inside the owner. The contained Records have no [Concepts#RecordID RecordId](36,20]
Set<Object>	variable	0	41,000,000 items	Collection extends ORecord>>, String	['is', 'a', 'test']('this',)	Collections values separated by commas and surrounded by brackets "[ ]". Example: [
Embedded map	The Records are contained inside the owner as values of the entries, while the keys can only be Strings. The contained Records have no [Concepts#RecordID RecordId](36,20]
Map<String, ?>	variable	0	41,000,000 items	Collection extends ORecord>>, String	{ 'name' : 'Luca' }	Collections values separated by commas and surrounded by curly braces "{ }". Example: {'key1':23,'key2':2332}
Custom	used to store a custom type providing the marshall and unmarshall methods	OSerializableStream	variable	0	X	-	base64 encoded binary	-