SPI_cursor_open_with_args (3)

Leading comments

    Title: SPI_cursor_open_with_args
   Author: The PostgreSQL Global Development Group
Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
     Date: 2017
   Manual: PostgreSQL 9.6.5 Documentation
   Source: PostgreSQL 9.6.5
 Language: English

(The comments found at the beginning of the groff file "man3/SPI_cursor_open_with_args.3".)

NAME

SPI_cursor_open_with_args - set up a cursor using a query and parameters

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 cursor's 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 doesn't 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.