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SPI_cursor_find
Name
SPI_cursor_find—findanexistingcursorbyname
Synopsis
Portal SPI_cursor_find(const char
name
)
Description
SPI_cursor_find
findsanexistingportalbyname.Thisisprimarilyusefultoresolveacursorname
returnedastextbysomeotherfunction.
Arguments
const char
name
nameoftheportal
Return Value
pointertotheportalwiththespecifiedname,or
NULL
ifnonewasfound
1158
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SPI_cursor_fetch
Name
SPI_cursor_fetch—fetchsomerowsfromacursor
Synopsis
void SPI_cursor_fetch(Portal
portal
, bool
forward
, long
count
)
Description
SPI_cursor_fetch
fetches somerows from acursor.This is equivalent toa subset ofthe SQL
command
FETCH
(see
SPI_scroll_cursor_fetch
formorefunctionality).
Arguments
Portal
portal
portalcontainingthecursor
bool
forward
trueforfetchforward,falseforfetchbackward
long
count
maximumnumberofrowstofetch
Return Value
SPI_processed
and
SPI_tuptable
aresetasin
SPI_execute
ifsuccessful.
Notes
Fetchingbackwardmayfailifthecursor’splanwasnotcreatedwiththe
CURSOR_OPT_SCROLL
op-
tion.
1159
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SPI_cursor_move
Name
SPI_cursor_move—moveacursor
Synopsis
void SPI_cursor_move(Portal
portal
, bool
forward
, long
count
)
Description
SPI_cursor_move
skipsoversomenumberofrowsinacursor.Thisisequivalenttoasubsetofthe
SQLcommand
MOVE
(see
SPI_scroll_cursor_move
formorefunctionality).
Arguments
Portal
portal
portalcontainingthecursor
bool
forward
trueformoveforward,falseformovebackward
long
count
maximumnumberofrowstomove
Notes
Movingbackwardmayfailifthecursor’splanwasnotcreatedwiththe
CURSOR_OPT_SCROLL
option.
1160
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SPI_scroll_cursor_fetch
Name
SPI_scroll_cursor_fetch—fetchsomerowsfromacursor
Synopsis
void SPI_scroll_cursor_fetch(Portal
portal
, FetchDirection
direction
,
long
count
)
Description
SPI_scroll_cursor_fetch
fetchessomerowsfromacursor.ThisisequivalenttotheSQLcom-
mand
FETCH
.
Arguments
Portal
portal
portalcontainingthecursor
FetchDirection
direction
oneof
FETCH_FORWARD
,
FETCH_BACKWARD
,
FETCH_ABSOLUTE
or
FETCH_RELATIVE
long
count
numberofrows tofetchfor
FETCH_FORWARD
or
FETCH_BACKWARD
;absolute row numberto
fetchfor
FETCH_ABSOLUTE
;orrelativerownumbertofetchfor
FETCH_RELATIVE
Return Value
SPI_processed
and
SPI_tuptable
aresetasin
SPI_execute
ifsuccessful.
Notes
SeetheSQLFETCHcommandfordetailsoftheinterpretationofthe
direction
and
count
param-
eters.
Directionvalues otherthan
FETCH_FORWARD
mayfailifthecursor’s planwasnotcreatedwiththe
CURSOR_OPT_SCROLL
option.
1161
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SPI_scroll_cursor_move
Name
SPI_scroll_cursor_move—moveacursor
Synopsis
void SPI_scroll_cursor_move(Portal
portal
, FetchDirection
direction
,
long
count
)
Description
SPI_scroll_cursor_move
skips oversomenumberofrowsinacursor.Thisisequivalenttothe
SQLcommand
MOVE
.
Arguments
Portal
portal
portalcontainingthecursor
FetchDirection
direction
oneof
FETCH_FORWARD
,
FETCH_BACKWARD
,
FETCH_ABSOLUTE
or
FETCH_RELATIVE
long
count
numberofrowstomove for
FETCH_FORWARD
or
FETCH_BACKWARD
;absoluterownumberto
movetofor
FETCH_ABSOLUTE
;orrelativerownumbertomovetofor
FETCH_RELATIVE
Return Value
SPI_processed
issetasin
SPI_execute
ifsuccessful.
SPI_tuptable
issetto
NULL
,sinceno
rowsarereturnedbythisfunction.
Notes
SeetheSQLFETCHcommandfordetailsoftheinterpretationofthe
direction
and
count
param-
eters.
Directionvalues otherthan
FETCH_FORWARD
mayfailifthecursor’s planwasnotcreatedwiththe
CURSOR_OPT_SCROLL
option.
1162
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SPI_cursor_close
Name
SPI_cursor_close—closeacursor
Synopsis
void SPI_cursor_close(Portal
portal
)
Description
SPI_cursor_close
closesapreviouslycreatedcursorandreleasesitsportalstorage.
Allopencursorsareclosedautomaticallyattheendofatransaction.
SPI_cursor_close
needonly
beinvokedifitisdesirabletoreleaseresourcessooner.
Arguments
Portal
portal
portalcontainingthecursor
1163
SPI_keepplan
Name
SPI_keepplan—saveapreparedstatement
Synopsis
int SPI_keepplan(SPIPlanPtr
plan
)
Description
SPI_keepplan
savesapassedstatement(preparedby
SPI_prepare
)sothatitwillnotbefreedby
SPI_finish
norbythetransactionmanager.Thisgivesyoutheabilitytoreusepreparedstatements
inthesubsequentinvocationsofyourprocedureinthecurrentsession.
Arguments
SPIPlanPtr
plan
thepreparedstatementtobesaved
Return Value
0onsuccess;
SPI_ERROR_ARGUMENT
if
plan
is
NULL
orinvalid
Notes
Thepassed-instatementisrelocatedtopermanentstoragebymeansofpointeradjustment(nodata
copyingisrequired).Ifyoulaterwishtodeleteit,use
SPI_freeplan
onit.
1164
SPI_saveplan
Name
SPI_saveplan—saveapreparedstatement
Synopsis
SPIPlanPtr SPI_saveplan(SPIPlanPtr
plan
)
Description
SPI_saveplan
copiesapassedstatement(preparedby
SPI_prepare
)intomemorythatwillnotbe
freedby
SPI_finish
norbythetransactionmanager,andreturnsapointertothecopiedstatement.
Thisgivesyoutheabilitytoreusepreparedstatementsinthesubsequentinvocationsofyourprocedure
inthecurrentsession.
Arguments
SPIPlanPtr
plan
thepreparedstatementtobesaved
Return Value
Pointertothecopiedstatement;or
NULL
ifunsuccessful.Onerror,
SPI_result
issetthus:
SPI_ERROR_ARGUMENT
if
plan
is
NULL
orinvalid
SPI_ERROR_UNCONNECTED
ifcalledfromanunconnectedprocedure
Notes
Theoriginallypassed-instatementisnotfreed,soyoumightwishtodo
SPI_freeplan
onittoavoid
leakingmemoryuntil
SPI_finish
.
Inmostcases,
SPI_keepplan
ispreferredtothisfunction,sinceitaccomplisheslargelythesame
resultwithoutneedingtophysicallycopythepreparedstatement’sdatastructures.
1165
44.2. Interface Support Functions
Thefunctionsdescribedhereprovideaninterfaceforextractinginformationfromresultsetsreturned
by
SPI_execute
andotherSPIfunctions.
Allfunctionsdescribedinthissectioncanbeusedbybothconnectedandunconnectedprocedures.
SPI_fname
Name
SPI_fname—determinethecolumnnameforthespecifiedcolumnnumber
Synopsis
char
*
SPI_fname(TupleDesc
rowdesc
, int
colnumber
)
Description
SPI_fname
returns a copy of the column name of the specifiedcolumn. (You can use
pfree
to
releasethecopyofthenamewhenyoudon’tneeditanymore.)
Arguments
TupleDesc
rowdesc
inputrowdescription
int
colnumber
columnnumber(countstartsat1)
Return Value
The column name;
NULL
if
colnumber
is out of range.
SPI_result
set to
SPI_ERROR_NOATTRIBUTE
onerror.
1166
SPI_fnumber
Name
SPI_fnumber—determinethecolumnnumberforthespecifiedcolumnname
Synopsis
int SPI_fnumber(TupleDesc
rowdesc
, const char
colname
)
Description
SPI_fnumber
returnsthecolumnnumberforthecolumnwiththespecifiedname.
If
colname
refers to a system column (e.g.,
oid
)then the appropriate negative column number
will be returned. The caller should be careful to test the return value for exact equality to
SPI_ERROR_NOATTRIBUTE
todetect anerror; testingthe result forless than or equalto 0is not
correctunlesssystemcolumnsshouldberejected.
Arguments
TupleDesc
rowdesc
inputrowdescription
const char
colname
columnname
Return Value
Columnnumber(count starts at 1), or
SPI_ERROR_NOATTRIBUTE
ifthe namedcolumnwas not
found.
1167
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