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CentOS 7.0 - man page for spi_getargcount (centos section 3)

SPI_GETARGCOUNT(3)					  PostgreSQL 9.2.7 Documentation					SPI_GETARGCOUNT(3)

NAME
SPI_getargcount - return the number of arguments needed by a statement prepared by SPI_prepare
SYNOPSIS
int SPI_getargcount(SPIPlanPtr plan)
DESCRIPTION
SPI_getargcount returns the number of arguments needed to execute a statement prepared by SPI_prepare.
ARGUMENTS
SPIPlanPtr plan prepared statement (returned by SPI_prepare)
RETURN VALUE
The count of expected arguments for the plan. If the plan is NULL or invalid, SPI_result is set to SPI_ERROR_ARGUMENT and -1 is returned. PostgreSQL 9.2.7 2014-02-17 SPI_GETARGCOUNT(3)