points_input.h File Reference

#include <stddef.h>
#include "c_types/point_on_edge_t.h"

Include dependency graph for points_input.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions
void	pgr_get_points (char *points_sql, Point_on_edge_t **points, size_t *total_points)
	pgr_get_points More...

Function Documentation

pgr_get_points()

void pgr_get_points	(	char *	points_sql,
		Point_on_edge_t **	points,
		size_t *	total_points
	)

pgr_get_points

For queries of the type:

SELECT pid, edge_id, fraction, [side]
FROM edge_table;

Parameters

[in]	points_sql
[out]	points
[out]	total_points

Definition at line 69 of file points_input.c.

                              {
    const int tuple_limit = 1000;
 
    size_t total_tuples;
    Column_info_t info[4];
 
    int i;
    for (i = 0; i < 4; ++i) {
        info[i].colNumber = -1;
        info[i].type = 0;
        info[i].strict = true;
        info[i].eType = ANY_INTEGER;
    }
 
    info[0].name = "pid";
    info[1].name = "edge_id";
    info[2].name = "fraction";
    info[3].name = "side";
 
    info[0].strict = false;
    info[3].strict = false;
    info[2].eType = ANY_NUMERICAL;
    info[3].eType = CHAR1;
 
 
    void *SPIplan;
    SPIplan = pgr_SPI_prepare(points_sql);
 
    Portal SPIportal;
    SPIportal = pgr_SPI_cursor_open(SPIplan);
 
    bool moredata = true;
    (*total_points) = total_tuples = 0;
 
    int64_t default_pid = 1;
    char default_side = 'b';
 
    while (moredata == true) {
        SPI_cursor_fetch(SPIportal, true, tuple_limit);
        if (total_tuples == 0) {
            /* on the first tuple get the column information */
            pgr_fetch_column_info(info, 4);
        }
 
        size_t ntuples = SPI_processed;
        total_tuples += ntuples;
 
        if (ntuples > 0) {
            if ((*points) == NULL)
                (*points) = (Point_on_edge_t *)
                    palloc0(total_tuples * sizeof(Point_on_edge_t));
            else
                (*points) = (Point_on_edge_t *)
                    repalloc((*points), total_tuples * sizeof(Point_on_edge_t));
 
            if ((*points) == NULL) {
                elog(ERROR, "Out of memory");
            }
 
            SPITupleTable *tuptable = SPI_tuptable;
            TupleDesc tupdesc = SPI_tuptable->tupdesc;
            size_t t;
 
            PGR_DBG("processing %ld points tuples", ntuples);
            for (t = 0; t < ntuples; t++) {
                HeapTuple tuple = tuptable->vals[t];
                fetch_point(&tuple, &tupdesc, info,
                        &default_pid, default_side,
                        &(*points)[total_tuples - ntuples + t]);
            }
            SPI_freetuptable(tuptable);
        } else {
            moredata = false;
        }
    }
    SPI_cursor_close(SPIportal);
 
 
    if (total_tuples == 0) {
        (*total_points) = 0;
        PGR_DBG("NO points");
        return;
    }
 
    (*total_points) = total_tuples;
    PGR_DBG("Finish reading %ld points, %ld", total_tuples, (*total_points));
}

References ANY_INTEGER, ANY_NUMERICAL, CHAR1, Column_info_t::colNumber, Column_info_t::eType, fetch_point(), Column_info_t::name, PGR_DBG, pgr_fetch_column_info(), pgr_SPI_cursor_open(), pgr_SPI_prepare(), Column_info_t::strict, and Column_info_t::type.

Referenced by process().