<s>
Hi/Lo	O
is	O
an	O
algorithm	O
and	O
a	O
key	O
generation	O
strategy	O
used	O
for	O
generating	O
unique	O
keys	O
for	O
use	O
in	O
a	O
database	O
as	O
a	O
primary	B-Application
key	I-Application
.	O
</s>
<s>
In	O
a	O
relational	O
database	O
management	O
system	O
this	O
could	O
be	O
through	O
a	O
stored	B-General_Concept
procedure	I-General_Concept
.	O
</s>
<s>
Example	O
implementation	O
in	O
Python	B-Language
.	O
</s>
<s>
Explained	O
in	O
the	O
2015	O
book	O
Learning	O
NHibernate	B-Language
4	O
by	O
Suhas	O
Chatekar	O
on	O
page	O
53	O
and	O
144	O
–	O
145	O
.	O
</s>
<s>
Mentioned	O
in	O
the	O
2017	O
book	O
NHibernate	B-Language
4.x	O
cookbook	O
on	O
page	O
35	O
.	O
</s>
<s>
Supported	O
by	O
Entity	B-Application
Framework	I-Application
Core	I-Application
(	O
ORM	O
for	O
.NET	O
Core	O
)	O
with	O
Microsoft	B-Application
SQL	I-Application
Server	I-Application
using	O
the	O
UseHiLo	O
extension	O
method	O
.	O
</s>
<s>
Not	O
supported	O
by	O
the	O
predecessor	O
Entity	B-Application
Framework	I-Application
.	O
</s>
<s>
Supported	O
by	O
Hibernate	B-Library
(	O
ORM	O
for	O
Java	O
)	O
and	O
NHibernate	B-Language
(	O
ORM	O
for	O
.NET	O
)	O
through	O
SequenceHiLoGenerator	O
and	O
TableHiLoGenerator	O
.	O
</s>
<s>
Supported	O
by	O
Doctrine	B-Language
(	O
ORM	O
for	O
PHP	O
)	O
through	O
the	O
TableGenerator	O
class	O
.	O
</s>
<s>
Supported	O
by	O
Marten	O
(	O
persistence	O
library	O
for	O
.NET	O
)	O
with	O
PostgreSQL	B-Application
through	O
the	O
HiLoSequence	O
class	O
.	O
</s>
<s>
Supported	O
by	O
RavenDB	B-Operating_System
(	O
a	O
NoSQL	O
document	O
database	O
)	O
.	O
</s>
<s>
Not	O
supported	O
by	O
Apache	B-Language
Cayenne	I-Language
,	O
ServiceStack.OrmLite	O
,	O
Ruby	B-Application
on	I-Application
Rails	I-Application
Active	O
Record	O
,	O
Dapper	O
,	O
and	O
Dashing	O
.	O
</s>
