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SPI_is_cursor_plan
Name
SPI_is_cursor_plan—return
true
ifastatementpreparedby
SPI_prepare
canbeused
with
SPI_cursor_open
Synopsis
bool SPI_is_cursor_plan(SPIPlanPtr
plan
)
Description
SPI_is_cursor_plan
returns
true
ifastatementpreparedby
SPI_prepare
canbepassedasan
argumentto
SPI_cursor_open
,or
false
ifthatisnotthecase.Thecriteriaarethatthe
plan
rep-
resentsonesinglecommandandthatthiscommandreturnstuplestothecaller;forexample,
SELECT
isallowedunlessitcontainsan
INTO
clause,and
UPDATE
isallowedonlyifitcontainsa
RETURNING
clause.
Arguments
SPIPlanPtr
plan
preparedstatement(returnedby
SPI_prepare
)
Return Value
true
or
false
toindicateifthe
plan
canproduceacursorornot,with
SPI_result
settozero.Ifit
isnotpossibletodeterminetheanswer(forexample,ifthe
plan
is
NULL
orinvalid,orifcalledwhen
notconnectedtoSPI),then
SPI_result
issettoasuitableerrorcodeand
false
isreturned.
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SPI_execute_plan
Name
SPI_execute_plan—executeastatementpreparedby
SPI_prepare
Synopsis
int SPI_execute_plan(SPIPlanPtr
plan
, Datum
values
, const char
nulls
,
bool
read_only
, long
count
)
Description
SPI_execute_plan
executes a statement prepared by
SPI_prepare
or one of its siblings.
read_only
and
count
havethesameinterpretationasin
SPI_execute
.
Arguments
SPIPlanPtr
plan
preparedstatement(returnedby
SPI_prepare
)
Datum
values
Anarrayofactualparametervalues.Musthavesamelengthasthestatement’snumberofargu-
ments.
const char
*
nulls
Anarraydescribingwhichparametersarenull.Musthavesamelengthasthestatement’snumber
ofarguments.
If
nulls
is
NULL
then
SPI_execute_plan
assumesthatnoparameters are null.Otherwise,
eachentryofthe
nulls
arrayshouldbe
’ ’
ifthecorrespondingparametervalueisnon-null,
or
’n’
ifthecorrespondingparametervalueis null.(Inthe lattercase,theactualvalueinthe
corresponding
values
entrydoesn’tmatter.)Notethat
nulls
isnotatextstring,justanarray:
itdoesnotneeda
’\0’
terminator.
bool
read_only
true
forread-onlyexecution
long
count
maximumnumberofrowstoreturn,or
0
fornolimit
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SPI_execute_plan
Return Value
Thereturnvalueisthesameasfor
SPI_execute
,withthefollowingadditionalpossibleerror(neg-
ative)results:
SPI_ERROR_ARGUMENT
if
plan
is
NULL
orinvalid,or
count
islessthan0
SPI_ERROR_PARAM
if
values
is
NULL
and
plan
waspreparedwithsomeparameters
SPI_processed
and
SPI_tuptable
aresetasin
SPI_execute
ifsuccessful.
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SPI_execute_plan_with_paramlist
Name
SPI_execute_plan_with_paramlist—executeastatementpreparedby
SPI_prepare
Synopsis
int SPI_execute_plan_with_paramlist(SPIPlanPtr
plan
,
ParamListInfo
params
,
bool
read_only
,
long
count
)
Description
SPI_execute_plan_with_paramlist
executes a statement prepared by
SPI_prepare
. This
functionisequivalentto
SPI_execute_plan
exceptthatinformationabouttheparametervaluesto
be passed to the query is presented differently. The
ParamListInfo
representation can be
convenientforpassingdownvaluesthatarealreadyavailableinthatformat.Italsosupportsuseof
dynamicparametersetsviahookfunctionsspecifiedin
ParamListInfo
.
Arguments
SPIPlanPtr
plan
preparedstatement(returnedby
SPI_prepare
)
ParamListInfo
params
datastructurecontainingparametertypesandvalues;NULLifnone
bool
read_only
true
forread-onlyexecution
long
count
maximumnumberofrowstoreturn,or
0
fornolimit
Return Value
Thereturnvalueisthesameasfor
SPI_execute_plan
.
SPI_processed
and
SPI_tuptable
aresetasin
SPI_execute_plan
ifsuccessful.
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SPI_execp
Name
SPI_execp—executeastatementinread/writemode
Synopsis
int SPI_execp(SPIPlanPtr
plan
, Datum
values
, const char
nulls
, long
count
)
Description
SPI_execp
isthesameas
SPI_execute_plan
,withthelatter’s
read_only
parameteralwaystaken
as
false
.
Arguments
SPIPlanPtr
plan
preparedstatement(returnedby
SPI_prepare
)
Datum
values
Anarrayofactualparametervalues.Musthavesamelengthasthestatement’snumberofargu-
ments.
const char
nulls
Anarraydescribingwhichparametersarenull.Musthavesamelengthasthestatement’snumber
ofarguments.
If
nulls
is
NULL
then
SPI_execp
assumesthatnoparametersarenull.Otherwise,eachentry
ofthe
nulls
arrayshouldbe
’ ’
ifthecorrespondingparametervalueisnon-null,or
’n’
ifthe
correspondingparametervalueisnull.(Inthelattercase,theactualvalueinthecorresponding
values
entrydoesn’tmatter.)Notethat
nulls
isnotatextstring,justanarray:itdoesnotneed
a
’\0’
terminator.
long
count
maximumnumberofrowstoreturn,or
0
fornolimit
Return Value
See
SPI_execute_plan
.
SPI_processed
and
SPI_tuptable
aresetasin
SPI_execute
ifsuccessful.
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SPI_cursor_open
Name
SPI_cursor_open—setupacursorusingastatementcreatedwith
SPI_prepare
Synopsis
Portal SPI_cursor_open(const char
name
, SPIPlanPtr
plan
,
Datum
values
, const char
nulls
,
bool
read_only
)
Description
SPI_cursor_open
sets up a cursor (internally, a portal) that will execute a statement prepared
by
SPI_prepare
. The parameters have the same meanings as the corresponding parameters to
SPI_execute_plan
.
Usingacursorinsteadofexecutingthestatementdirectlyhastwobenefits.First,theresultrowscan
beretrieved afewatatime,avoidingmemoryoverrunforqueries thatreturnmanyrows.Second,
aportalcanoutlivethecurrentprocedure(itcan,infact,livetotheendofthecurrenttransaction).
Returningtheportalnametotheprocedure’scallerprovidesawayofreturningarowsetasresult.
Thepassed-inparameterdatawillbecopiedintothecursor’sportal,soitcanbefreedwhilethecursor
stillexists.
Arguments
const char
name
nameforportal,or
NULL
toletthesystemselectaname
SPIPlanPtr
plan
preparedstatement(returnedby
SPI_prepare
)
Datum
values
Anarrayofactualparametervalues.Musthavesamelengthasthestatement’snumberofargu-
ments.
const char
nulls
Anarraydescribingwhichparametersarenull.Musthavesamelengthasthestatement’snumber
ofarguments.
If
nulls
is
NULL
then
SPI_cursor_open
assumes that no parameters are null.Otherwise,
eachentryofthe
nulls
arrayshouldbe
’ ’
ifthecorrespondingparametervalueisnon-null,
or
’n’
ifthecorrespondingparametervalueis null.(Inthe lattercase,theactualvalueinthe
corresponding
values
entrydoesn’tmatter.)Notethat
nulls
isnotatextstring,justanarray:
itdoesnotneeda
’\0’
terminator.
1153
SPI_cursor_open
bool
read_only
true
forread-onlyexecution
Return Value
Pointer to portalcontainingthe cursor.Notethere is noerrorreturnconvention; any errorwill be
reportedvia
elog
.
1154
SPI_cursor_open_with_args
Name
SPI_cursor_open_with_args—setupacursorusingaqueryandparameters
Synopsis
Portal SPI_cursor_open_with_args(const char
*name
,
const char
*command
,
int
nargs
, Oid
*argtypes
,
Datum
*values
, const char
*nulls
,
bool
read_only
, int
cursorOptions
)
Description
SPI_cursor_open_with_args
sets up a cursor(internally, a portal)that will execute the spec-
ified query. Most of the parameters have the same meanings as the corresponding parameters to
SPI_prepare_cursor
and
SPI_cursor_open
.
For one-time query execution,this function should be preferred over
SPI_prepare_cursor
fol-
lowedby
SPI_cursor_open
.Ifthesamecommandistobeexecutedwithmanydifferentparame-
ters,eithermethodmightbefaster,dependingonthecostofre-planningversusthebenefitofcustom
plans.
Thepassed-inparameterdatawillbecopiedintothecursor’sportal,soitcanbefreedwhilethecursor
stillexists.
Arguments
const char
name
nameforportal,or
NULL
toletthesystemselectaname
const char
command
commandstring
int
nargs
numberofinputparameters(
$1
,
$2
,etc.)
Oid
argtypes
anarrayoflength
nargs
,containingtheOIDsofthedatatypesoftheparameters
Datum
values
anarrayoflength
nargs
,containingtheactualparametervalues
const char
*
nulls
anarrayoflength
nargs
,describingwhichparametersarenull
If
nulls
is
NULL
then
SPI_cursor_open_with_args
assumes thatnoparametersarenull.
Otherwise,eachentryofthe
nulls
arrayshouldbe
’ ’
ifthecorrespondingparametervalueis
1155
SPI_cursor_open_with_args
non-null,or
’n’
ifthecorrespondingparametervalueisnull.(Inthelattercase,theactualvalue
inthecorresponding
values
entrydoesn’tmatter.)Notethat
nulls
isnotatextstring,justan
array:itdoesnotneeda
’\0’
terminator.
bool
read_only
true
forread-onlyexecution
int
cursorOptions
integerbitmaskofcursoroptions;zeroproducesdefaultbehavior
Return Value
Pointer to portalcontainingthe cursor.Notethere is noerrorreturnconvention; any errorwill be
reportedvia
elog
.
1156
SPI_cursor_open_with_paramlist
Name
SPI_cursor_open_with_paramlist—setupacursorusingparameters
Synopsis
Portal SPI_cursor_open_with_paramlist(const char
*name
,
SPIPlanPtr
plan
,
ParamListInfo
params
,
bool
read_only
)
Description
SPI_cursor_open_with_paramlist
sets up a cursor (internally, a portal) that will execute a
statement prepared by
SPI_prepare
. This function is equivalent to
SPI_cursor_open
except
thatinformationaboutthe parametervaluestobepassedtothequeryispresenteddifferently.The
ParamListInfo
representation can be convenient for passing down values that are already
availableinthatformat.Italsosupportsuseofdynamicparametersetsviahookfunctionsspecified
in
ParamListInfo
.
Thepassed-inparameterdatawillbecopiedintothecursor’sportal,soitcanbefreedwhilethecursor
stillexists.
Arguments
const char
name
nameforportal,or
NULL
toletthesystemselectaname
SPIPlanPtr
plan
preparedstatement(returnedby
SPI_prepare
)
ParamListInfo
params
datastructurecontainingparametertypesandvalues;NULLifnone
bool
read_only
true
forread-onlyexecution
Return Value
Pointer to portalcontainingthe cursor.Notethere is noerrorreturnconvention; any errorwill be
reportedvia
elog
.
1157
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