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

SPI_EXECUTE_PLAN(3)					  PostgreSQL 9.2.7 Documentation				       SPI_EXECUTE_PLAN(3)

SPI_execute_plan - execute a statement prepared by SPI_prepare
int SPI_execute_plan(SPIPlanPtr plan, Datum * values, const char * nulls, bool read_only, long count)
SPI_execute_plan executes a statement prepared by SPI_prepare or one of its siblings. read_only and count have the same interpretation as in SPI_execute.
SPIPlanPtr plan prepared statement (returned by SPI_prepare) Datum * values An array of actual parameter values. Must have same length as the statement's number of arguments. const char * nulls An array describing which parameters are null. Must have same length as the statement's number of arguments. n indicates a null value (entry in values will be ignored); a space indicates a nonnull value (entry in values is valid). If nulls is NULL then SPI_execute_plan assumes that no parameters are null. bool read_only true for read-only execution long count maximum number of rows to return, or 0 for no limit
The return value is the same as for SPI_execute, with the following additional possible error (negative) results: SPI_ERROR_ARGUMENT if plan is NULL or invalid, or count is less than 0 SPI_ERROR_PARAM if values is NULL and plan was prepared with some parameters SPI_processed and SPI_tuptable are set as in SPI_execute if successful. PostgreSQL 9.2.7 2014-02-17 SPI_EXECUTE_PLAN(3)