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Manual Reference Pages  -  SPI_CURSOR_OPEN_WITH_ARGS (3)

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NAME

SPI_cursor_open_with_args - set up a cursor using a query and parameters

CONTENTS

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 specified 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 followed by SPI_cursor_open. If the same command is to be executed with many different parameters, either method might be faster, depending on the cost of re-planning versus the benefit of custom plans.

The passed-in parameter data will be copied into the cursors portal, so it can be freed while the cursor still exists.

ARGUMENTS

const char * name

name for portal, or NULL to let the system select a name

const char * command

command string

int nargs

number of input parameters ($1, $2, etc.)

Oid * argtypes

an array of length nargs, containing the OIDs of the data types of the parameters

Datum * values

an array of length nargs, containing the actual parameter values

const char * nulls

an array of length nargs, describing which parameters are null

If nulls is NULL then SPI_cursor_open_with_args assumes that no parameters are null. Otherwise, each entry of the nulls array should be if the corresponding parameter value is non-null, or n if the corresponding parameter value is null. (In the latter case, the actual value in the corresponding values entry doesnt matter.) Note that nulls is not a text string, just an array: it does not need a \0 terminator.

bool read_only

true for read-only execution

int cursorOptions

integer bit mask of cursor options; zero produces default behavior

RETURN VALUE

Pointer to portal containing the cursor. Note there is no error return convention; any error will be reported via elog.

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PostgreSQL 9.5.2 SPI_CURSOR_OPEN_WITH_ARGS (3) 2016

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