<s>
jOOQ	B-Language
Object	I-Language
Oriented	I-Language
Querying	I-Language
,	O
commonly	O
known	O
as	O
jOOQ	B-Language
,	O
is	O
a	O
light	O
database-mapping	O
software	B-Library
library	I-Library
in	O
Java	B-Language
that	O
implements	O
the	O
active	O
record	O
pattern	O
.	O
</s>
<s>
Its	O
purpose	O
is	O
to	O
be	O
both	O
relational	B-Architecture
and	O
object	B-Language
oriented	I-Language
by	O
providing	O
a	O
domain-specific	B-Language
language	I-Language
to	O
construct	O
queries	O
from	O
classes	B-Application
generated	I-Application
from	O
a	O
database	B-Application
schema	I-Application
.	O
</s>
<s>
jOOQ	B-Language
claims	O
that	O
SQL	B-Language
should	O
come	O
first	O
in	O
any	O
database	O
integration	O
.	O
</s>
<s>
Thus	O
,	O
it	O
does	O
not	O
introduce	O
a	O
new	O
textual	O
query	B-Language
language	I-Language
,	O
but	O
rather	O
allows	O
for	O
constructing	O
plain	O
SQL	B-Language
from	O
jOOQ	B-Language
objects	O
and	O
code	O
generated	O
from	O
a	O
database	B-Application
schema	I-Application
.	O
</s>
<s>
jOOQ	B-Language
uses	O
JDBC	B-Language
to	O
call	O
the	O
underlying	O
SQL	B-Language
queries	O
.	O
</s>
<s>
While	O
it	O
provides	O
abstraction	O
on	O
top	O
of	O
JDBC	B-Language
,	O
jOOQ	B-Language
does	O
not	O
have	O
as	O
much	O
functionality	O
and	O
complexity	O
as	O
standard	O
object	B-General_Concept
–	I-General_Concept
relational	I-General_Concept
mapping	I-General_Concept
libraries	O
such	O
as	O
EclipseLink	B-Language
or	O
Hibernate	B-Library
.	O
</s>
<s>
jOOQ	B-Language
's	O
closeness	O
to	O
SQL	B-Language
has	O
advantages	O
over	O
typical	O
object	B-General_Concept
–	I-General_Concept
relational	I-General_Concept
mapping	I-General_Concept
libraries	O
.	O
</s>
<s>
SQL	B-Language
has	O
many	O
features	O
that	O
cannot	O
be	O
used	O
in	O
an	O
object	B-Language
oriented	I-Language
programming	I-Language
paradigm	O
;	O
this	O
set	O
of	O
differences	O
is	O
referred	O
to	O
as	O
the	O
object	B-Architecture
–	I-Architecture
relational	I-Architecture
impedance	I-Architecture
mismatch	I-Architecture
.	O
</s>
<s>
By	O
being	O
close	O
to	O
SQL	B-Language
,	O
jOOQ	B-Language
helps	O
to	O
prevent	O
syntax	B-Application
errors	I-Application
and	O
type	O
mapping	O
problems	O
.	O
</s>
<s>
It	O
is	O
also	O
possible	O
in	O
jOOQ	B-Language
to	O
create	O
very	O
complex	O
queries	O
,	O
that	O
involve	O
aliasing	O
,	O
unions	B-Language
,	O
nested	O
selects	O
and	O
complex	O
joins	O
.	O
</s>
<s>
jOOQ	B-Language
also	O
supports	O
database-specific	O
features	O
,	O
such	O
as	O
UDTs	B-Language
,	O
enum	B-Language
types	I-Language
,	O
stored	B-General_Concept
procedures	I-General_Concept
and	O
native	O
functions	O
.	O
</s>
<s>
And	O
its	O
equivalent	O
in	O
jOOQ	B-Language
DSL	O
:	O
</s>
<s>
Or	O
more	O
simply	O
,	O
using	O
code	B-Application
generation	I-Application
from	O
the	O
database	O
metadata	O
to	O
generate	O
constants	O
:	O
</s>
