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dblink
Name
dblink—executesaqueryinaremotedatabase
Synopsis
dblink(text connname, text sql [, bool fail_on_error]) returns setof record
dblink(text connstr, text sql [, bool fail_on_error]) returns setof record
dblink(text sql [, bool fail_on_error]) returns setof record
Description
dblink
executesaquery(usuallya
SELECT
,butitcanbeanySQLstatementthatreturnsrows)ina
remotedatabase.
Whentwo
text
argumentsaregiven,thefirstoneisfirstlookedupasapersistentconnection’sname;
iffound,thecommandisexecutedonthatconnection.Ifnotfound,thefirstargumentis treatedas
aconnectioninfostringasfor
dblink_connect
,andtheindicatedconnectionismadejustforthe
durationofthiscommand.
Arguments
connname
Nameoftheconnectiontouse;omitthisparametertousetheunnamedconnection.
connstr
Aconnectioninfostring,aspreviouslydescribedfor
dblink_connect
.
sql
TheSQLquerythatyouwishtoexecuteintheremotedatabase,forexample
select
*
from
foo
.
fail_on_error
If true (thedefaultwhen omitted)thenanerrorthrownonthe remote side ofthe connection
causes anerrortoalsobethrownlocally.Iffalse,theremoteerroris locallyreportedasaNO-
TICE,andthefunctionreturnsnorows.
Return Value
Thefunctionreturnstherow(s)producedbythequery.Since
dblink
canbeusedwithanyquery,it
isdeclaredtoreturn
record
,ratherthanspecifyinganyparticularsetofcolumns.Thismeansthat
youmustspecifytheexpectedsetofcolumnsinthecallingquery—otherwisePostgreSQLwould
notknowwhattoexpect.Hereisanexample:
SELECT
*
FROM dblink(’dbname=mydb’, ’select proname, prosrc from pg_proc’)
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dblink
AS t1(proname name, prosrc text)
WHERE proname LIKE ’bytea%’;
The“alias”partofthe
FROM
clausemustspecifythecolumnnamesandtypesthatthefunctionwill
return.(SpecifyingcolumnnamesinanaliasisactuallystandardSQLsyntax,butspecifyingcolumn
typesisaPostgreSQLextension.)Thisallowsthesystemtounderstandwhat
*
shouldexpandto,and
what
proname
in the
WHERE
clause refers to,inadvance oftrying to executethefunction.Atrun
time,anerrorwillbethrowniftheactualqueryresultfromtheremotedatabasedoes nothavethe
samenumberofcolumns showninthe
FROM
clause.Thecolumnnamesneednotmatch,however,
and
dblink
doesnotinsistonexacttypematcheseither.Itwillsucceedsolongasthereturneddata
stringsarevalidinputforthecolumntypedeclaredinthe
FROM
clause.
Notes
Aconvenientwaytouse
dblink
withpredetermined queries is tocreate aview.This allows the
columntypeinformationtobeburiedintheview,insteadofhavingtospellitoutineveryquery.For
example,
CREATE VIEW myremote_pg_proc AS
SELECT
*
FROM dblink(’dbname=postgres’, ’select proname, prosrc from pg_proc’)
AS t1(proname name, prosrc text);
SELECT
*
FROM myremote_pg_proc WHERE proname LIKE ’bytea%’;
Examples
SELECT
*
FROM dblink(’dbname=postgres’, ’select proname, prosrc from pg_proc’)
AS t1(proname name, prosrc text) WHERE proname LIKE ’bytea%’;
proname
|
prosrc
------------+------------
byteacat
| byteacat
byteaeq
| byteaeq
bytealt
| bytealt
byteale
| byteale
byteagt
| byteagt
byteage
| byteage
byteane
| byteane
byteacmp
| byteacmp
bytealike
| bytealike
byteanlike | byteanlike
byteain
| byteain
byteaout
| byteaout
(12 rows)
SELECT dblink_connect(’dbname=postgres’);
dblink_connect
----------------
OK
(1 row)
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dblink
SELECT
*
FROM dblink(’select proname, prosrc from pg_proc’)
AS t1(proname name, prosrc text) WHERE proname LIKE ’bytea%’;
proname
|
prosrc
------------+------------
byteacat
| byteacat
byteaeq
| byteaeq
bytealt
| bytealt
byteale
| byteale
byteagt
| byteagt
byteage
| byteage
byteane
| byteane
byteacmp
| byteacmp
bytealike
| bytealike
byteanlike | byteanlike
byteain
| byteain
byteaout
| byteaout
(12 rows)
SELECT dblink_connect(’myconn’, ’dbname=regression’);
dblink_connect
----------------
OK
(1 row)
SELECT
*
FROM dblink(’myconn’, ’select proname, prosrc from pg_proc’)
AS t1(proname name, prosrc text) WHERE proname LIKE ’bytea%’;
proname
|
prosrc
------------+------------
bytearecv
| bytearecv
byteasend
| byteasend
byteale
| byteale
byteagt
| byteagt
byteage
| byteage
byteane
| byteane
byteacmp
| byteacmp
bytealike
| bytealike
byteanlike | byteanlike
byteacat
| byteacat
byteaeq
| byteaeq
bytealt
| bytealt
byteain
| byteain
byteaout
| byteaout
(14 rows)
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dblink_exec
Name
dblink_exec—executesacommandinaremotedatabase
Synopsis
dblink_exec(text connname, text sql [, bool fail_on_error]) returns text
dblink_exec(text connstr, text sql [, bool fail_on_error]) returns text
dblink_exec(text sql [, bool fail_on_error]) returns text
Description
dblink_exec
executesacommand(thatis,anySQLstatementthatdoesn’treturnrows)inaremote
database.
Whentwo
text
argumentsaregiven,thefirstoneisfirstlookedupasapersistentconnection’sname;
iffound,thecommandisexecutedonthatconnection.Ifnotfound,thefirstargumentis treatedas
aconnectioninfostringasfor
dblink_connect
,andtheindicatedconnectionismadejustforthe
durationofthiscommand.
Arguments
connname
Nameoftheconnectiontouse;omitthisparametertousetheunnamedconnection.
connstr
Aconnectioninfostring,aspreviouslydescribedfor
dblink_connect
.
sql
TheSQLcommandthatyouwishtoexecuteintheremotedatabase,forexample
insert into
foo values(0,’a’,’{"a0","b0","c0"}’)
.
fail_on_error
If true (thedefaultwhen omitted)thenanerrorthrownonthe remote side ofthe connection
causes anerrortoalsobethrownlocally.Iffalse,theremoteerroris locallyreportedasaNO-
TICE,andthefunction’sreturnvalueissetto
ERROR
.
Return Value
Returnsstatus,eitherthecommand’sstatusstringor
ERROR
.
Examples
SELECT dblink_connect(’dbname=dblink_test_standby’);
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dblink_exec
dblink_connect
----------------
OK
(1 row)
SELECT dblink_exec(’insert into foo values(21,”z”,”{"a0","b0","c0"}”);’);
dblink_exec
-----------------
INSERT 943366 1
(1 row)
SELECT dblink_connect(’myconn’, ’dbname=regression’);
dblink_connect
----------------
OK
(1 row)
SELECT dblink_exec(’myconn’, ’insert into foo values(21,”z”,”{"a0","b0","c0"}”);’);
dblink_exec
------------------
INSERT 6432584 1
(1 row)
SELECT dblink_exec(’myconn’, ’insert into pg_class values (”foo”)’,false);
NOTICE:
sql error
DETAIL:
ERROR:
null value in column "relnamespace" violates not-null constraint
dblink_exec
-------------
ERROR
(1 row)
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dblink_open
Name
dblink_open—opensacursorinaremotedatabase
Synopsis
dblink_open(text cursorname, text sql [, bool fail_on_error]) returns text
dblink_open(text connname, text cursorname, text sql [, bool fail_on_error]) returns text
Description
dblink_open()
opensacursorinaremotedatabase.Thecursorcansubsequentlybemanipulated
with
dblink_fetch()
and
dblink_close()
.
Arguments
connname
Nameoftheconnectiontouse;omitthisparametertousetheunnamedconnection.
cursorname
Thenametoassigntothiscursor.
sql
The
SELECT
statementthatyouwishtoexecuteintheremotedatabase,forexample
select
*
from pg_class
.
fail_on_error
If true (thedefaultwhen omitted)thenanerrorthrownonthe remote side ofthe connection
causes anerrortoalsobethrownlocally.Iffalse,theremoteerroris locallyreportedasaNO-
TICE,andthefunction’sreturnvalueissetto
ERROR
.
Return Value
Returnsstatus,either
OK
or
ERROR
.
Notes
Sinceacursorcanonlypersistwithinatransaction,
dblink_open
startsanexplicittransactionblock
(
BEGIN
)on the remote side, ifthe remote side was not already within a transaction. This trans-
action will be closedagain when the matching
dblink_close
is executed.Note that ifyouuse
dblink_exec
tochange data between
dblink_open
and
dblink_close
, and thenan erroroc-
cursoryouuse
dblink_disconnect
before
dblink_close
,yourchangewillbelostbecausethe
transactionwillbeaborted.
2763
dblink_open
Examples
SELECT dblink_connect(’dbname=postgres’);
dblink_connect
----------------
OK
(1 row)
SELECT dblink_open(’foo’, ’select proname, prosrc from pg_proc’);
dblink_open
-------------
OK
(1 row)
2764
dblink_fetch
Name
dblink_fetch—returnsrowsfromanopencursorinaremotedatabase
Synopsis
dblink_fetch(text cursorname, int howmany [, bool fail_on_error]) returns setof record
dblink_fetch(text connname, text cursorname, int howmany [, bool fail_on_error]) returns setof record
Description
dblink_fetch
fetchesrowsfromacursorpreviouslyestablishedby
dblink_open
.
Arguments
connname
Nameoftheconnectiontouse;omitthisparametertousetheunnamedconnection.
cursorname
Thenameofthecursortofetchfrom.
howmany
Themaximumnumberofrowstoretrieve.Thenext
howmany
rows arefetched,startingatthe
currentcursorposition,movingforward.Oncethecursorhasreacheditsend,nomorerowsare
produced.
fail_on_error
If true (thedefaultwhen omitted)thenanerrorthrownonthe remote side ofthe connection
causes anerrortoalsobethrownlocally.Iffalse,theremoteerroris locallyreportedasaNO-
TICE,andthefunctionreturnsnorows.
Return Value
Thefunctionreturnstherow(s)fetchedfromthecursor.Tousethisfunction,youwillneedtospecify
theexpectedsetofcolumns,aspreviouslydiscussedfor
dblink
.
Notes
Onamismatchbetweenthenumberofreturncolumns specifiedinthe
FROM
clause,andtheactual
numberofcolumnsreturnedbytheremotecursor,anerrorwillbethrown.Inthisevent,theremote
cursorisstilladvancedbyasmanyrowsasitwouldhavebeeniftheerrorhadnotoccurred.Thesame
istrueforanyothererroroccurringinthelocalqueryaftertheremote
FETCH
hasbeendone.
2765
dblink_fetch
Examples
SELECT dblink_connect(’dbname=postgres’);
dblink_connect
----------------
OK
(1 row)
SELECT dblink_open(’foo’, ’select proname, prosrc from pg_proc where proname like ”bytea%”’);
dblink_open
-------------
OK
(1 row)
SELECT
*
FROM dblink_fetch(’foo’, 5) AS (funcname name, source text);
funcname |
source
----------+----------
byteacat | byteacat
byteacmp | byteacmp
byteaeq
| byteaeq
byteage
| byteage
byteagt
| byteagt
(5 rows)
SELECT
*
FROM dblink_fetch(’foo’, 5) AS (funcname name, source text);
funcname
|
source
-----------+-----------
byteain
| byteain
byteale
| byteale
bytealike | bytealike
bytealt
| bytealt
byteane
| byteane
(5 rows)
SELECT
*
FROM dblink_fetch(’foo’, 5) AS (funcname name, source text);
funcname
|
source
------------+------------
byteanlike | byteanlike
byteaout
| byteaout
(2 rows)
SELECT
*
FROM dblink_fetch(’foo’, 5) AS (funcname name, source text);
funcname | source
----------+--------
(0 rows)
2766
dblink_close
Name
dblink_close—closesacursorinaremotedatabase
Synopsis
dblink_close(text cursorname [, bool fail_on_error]) returns text
dblink_close(text connname, text cursorname [, bool fail_on_error]) returns text
Description
dblink_close
closesacursorpreviouslyopenedwith
dblink_open
.
Arguments
connname
Nameoftheconnectiontouse;omitthisparametertousetheunnamedconnection.
cursorname
Thenameofthecursortoclose.
fail_on_error
If true (thedefaultwhen omitted)thenanerrorthrownonthe remote side ofthe connection
causes anerrortoalsobethrownlocally.Iffalse,theremoteerroris locallyreportedasaNO-
TICE,andthefunction’sreturnvalueissetto
ERROR
.
Return Value
Returnsstatus,either
OK
or
ERROR
.
Notes
If
dblink_open
startedanexplicittransactionblock,andthis is thelastremainingopencursorin
thisconnection,
dblink_close
willissuethematching
COMMIT
.
Examples
SELECT dblink_connect(’dbname=postgres’);
dblink_connect
----------------
OK
(1 row)
2767
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