PostgreSQL 9.4 Документация
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SPI_getargcount

Name

SPI_getargcount -- return the number of arguments needed by a statement prepared by SPI_prepare

int SPI_getargcount(SPIPlanPtr plan)

SPI_getargcount returns the number of arguments needed to execute a statement prepared by SPI_prepare.

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.

Пред	Начало	След
SPI_prepare_params	Выше	SPI_getargtypeid