regress.c

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

/*
 * $PostgreSQL: pgsql/src/test/regress/regress.c,v 1.64 2005/10/15 02:49:51 momjian Exp $
 */

#include "postgres.h"

#include <float.h>				/* faked on sunos */

#include "utils/geo_decls.h"	/* includes <math.h> */
#include "executor/executor.h"	/* For GetAttributeByName */
#include "commands/sequence.h"	/* for nextval() */

#define P_MAXDIG 12
#define LDELIM			'('
#define RDELIM			')'
#define DELIM			','

extern Datum regress_dist_ptpath(PG_FUNCTION_ARGS);
extern Datum regress_path_dist(PG_FUNCTION_ARGS);
extern PATH *poly2path(POLYGON *poly);
extern Datum interpt_pp(PG_FUNCTION_ARGS);
extern void regress_lseg_construct(LSEG *lseg, Point *pt1, Point *pt2);
extern Datum overpaid(PG_FUNCTION_ARGS);
extern Datum boxarea(PG_FUNCTION_ARGS);
extern char *reverse_name(char *string);
extern int	oldstyle_length(int n, text *t);
extern Datum int44in(PG_FUNCTION_ARGS);
extern Datum int44out(PG_FUNCTION_ARGS);
extern Datum do_sleep(PG_FUNCTION_ARGS);


/*
 * Distance from a point to a path
 */
PG_FUNCTION_INFO_V1(regress_dist_ptpath);

Datum
regress_dist_ptpath(PG_FUNCTION_ARGS)
{
	Point	   *pt = PG_GETARG_POINT_P(0);
	PATH	   *path = PG_GETARG_PATH_P(1);
	float8		result = 0.0;	/* keep compiler quiet */
	float8		tmp;
	int			i;
	LSEG		lseg;

	switch (path->npts)
	{
		case 0:
			PG_RETURN_NULL();
		case 1:
			result = point_dt(pt, &path->p[0]);
			break;
		default:

			/*
			 * the distance from a point to a path is the smallest distance
			 * from the point to any of its constituent segments.
			 */
			Assert(path->npts > 1);
			for (i = 0; i < path->npts - 1; ++i)
			{
				regress_lseg_construct(&lseg, &path->p[i], &path->p[i + 1]);
				tmp = DatumGetFloat8(DirectFunctionCall2(dist_ps,
														 PointPGetDatum(pt),
													  LsegPGetDatum(&lseg)));
				if (i == 0 || tmp < result)
					result = tmp;
			}
			break;
	}
	PG_RETURN_FLOAT8(result);
}

/*
 * this essentially does a cartesian product of the lsegs in the
 * two paths, and finds the min distance between any two lsegs
 */
PG_FUNCTION_INFO_V1(regress_path_dist);

Datum
regress_path_dist(PG_FUNCTION_ARGS)
{
	PATH	   *p1 = PG_GETARG_PATH_P(0);
	PATH	   *p2 = PG_GETARG_PATH_P(1);
	bool		have_min = false;
	float8		min = 0.0;		/* initialize to keep compiler quiet */
	float8		tmp;
	int			i,
				j;
	LSEG		seg1,
				seg2;

	for (i = 0; i < p1->npts - 1; i++)
	{
		for (j = 0; j < p2->npts - 1; j++)
		{
			regress_lseg_construct(&seg1, &p1->p[i], &p1->p[i + 1]);
			regress_lseg_construct(&seg2, &p2->p[j], &p2->p[j + 1]);

			tmp = DatumGetFloat8(DirectFunctionCall2(lseg_distance,
													 LsegPGetDatum(&seg1),
													 LsegPGetDatum(&seg2)));
			if (!have_min || tmp < min)
			{
				min = tmp;
				have_min = true;
			}
		}
	}

	if (!have_min)
		PG_RETURN_NULL();

	PG_RETURN_FLOAT8(min);
}

PATH *
poly2path(POLYGON *poly)
{
	int			i;
	char	   *output = (char *) palloc(2 * (P_MAXDIG + 1) * poly->npts + 64);
	char		buf[2 * (P_MAXDIG) + 20];

	sprintf(output, "(1, %*d", P_MAXDIG, poly->npts);

	for (i = 0; i < poly->npts; i++)
	{
		snprintf(buf, sizeof(buf), ",%*g,%*g",
				 P_MAXDIG, poly->p[i].x, P_MAXDIG, poly->p[i].y);
		strcat(output, buf);
	}

	snprintf(buf, sizeof(buf), "%c", RDELIM);
	strcat(output, buf);
	return DatumGetPathP(DirectFunctionCall1(path_in,
											 CStringGetDatum(output)));
}

/* return the point where two paths intersect, or NULL if no intersection. */
PG_FUNCTION_INFO_V1(interpt_pp);

Datum
interpt_pp(PG_FUNCTION_ARGS)
{
	PATH	   *p1 = PG_GETARG_PATH_P(0);
	PATH	   *p2 = PG_GETARG_PATH_P(1);
	int			i,
				j;
	LSEG		seg1,
				seg2;
	bool		found;			/* We've found the intersection */

	found = false;				/* Haven't found it yet */

	for (i = 0; i < p1->npts - 1 && !found; i++)
	{
		regress_lseg_construct(&seg1, &p1->p[i], &p1->p[i + 1]);
		for (j = 0; j < p2->npts - 1 && !found; j++)
		{
			regress_lseg_construct(&seg2, &p2->p[j], &p2->p[j + 1]);
			if (DatumGetBool(DirectFunctionCall2(lseg_intersect,
												 LsegPGetDatum(&seg1),
												 LsegPGetDatum(&seg2))))
				found = true;
		}
	}

	if (!found)
		PG_RETURN_NULL();

	/*
	 * Note: DirectFunctionCall2 will kick out an error if lseg_interpt()
	 * returns NULL, but that should be impossible since we know the two
	 * segments intersect.
	 */
	PG_RETURN_DATUM(DirectFunctionCall2(lseg_interpt,
										LsegPGetDatum(&seg1),
										LsegPGetDatum(&seg2)));
}


/* like lseg_construct, but assume space already allocated */
void
regress_lseg_construct(LSEG *lseg, Point *pt1, Point *pt2)
{
	lseg->p[0].x = pt1->x;
	lseg->p[0].y = pt1->y;
	lseg->p[1].x = pt2->x;
	lseg->p[1].y = pt2->y;
	lseg->m = point_sl(pt1, pt2);
}

PG_FUNCTION_INFO_V1(overpaid);

Datum
overpaid(PG_FUNCTION_ARGS)
{
	HeapTupleHeader tuple = PG_GETARG_HEAPTUPLEHEADER(0);
	bool		isnull;
	int32		salary;

	salary = DatumGetInt32(GetAttributeByName(tuple, "salary", &isnull));
	if (isnull)
		PG_RETURN_NULL();
	PG_RETURN_BOOL(salary > 699);
}

/* New type "widget"
 * This used to be "circle", but I added circle to builtins,
 *	so needed to make sure the names do not collide. - tgl 97/04/21
 */

typedef struct
{
	Point		center;
	double		radius;
}	WIDGET;

WIDGET	   *widget_in(char *str);
char	   *widget_out(WIDGET * widget);
extern Datum pt_in_widget(PG_FUNCTION_ARGS);

#define NARGS	3

WIDGET *
widget_in(char *str)
{
	char	   *p,
			   *coord[NARGS],
				buf2[1000];
	int			i;
	WIDGET	   *result;

	if (str == NULL)
		return NULL;
	for (i = 0, p = str; *p && i < NARGS && *p != RDELIM; p++)
		if (*p == ',' || (*p == LDELIM && !i))
			coord[i++] = p + 1;
	if (i < NARGS - 1)
		return NULL;
	result = (WIDGET *) palloc(sizeof(WIDGET));
	result->center.x = atof(coord[0]);
	result->center.y = atof(coord[1]);
	result->radius = atof(coord[2]);

	snprintf(buf2, sizeof(buf2), "widget_in: read (%f, %f, %f)\n",
			 result->center.x, result->center.y, result->radius);
	return result;
}

char *
widget_out(WIDGET * widget)
{
	char	   *result;

	if (widget == NULL)
		return NULL;

	result = (char *) palloc(60);
	sprintf(result, "(%g,%g,%g)",
			widget->center.x, widget->center.y, widget->radius);
	return result;
}

PG_FUNCTION_INFO_V1(pt_in_widget);

Datum
pt_in_widget(PG_FUNCTION_ARGS)
{
	Point	   *point = PG_GETARG_POINT_P(0);
	WIDGET	   *widget = (WIDGET *) PG_GETARG_POINTER(1);

	PG_RETURN_BOOL(point_dt(point, &widget->center) < widget->radius);
}

PG_FUNCTION_INFO_V1(boxarea);

Datum
boxarea(PG_FUNCTION_ARGS)
{
	BOX		   *box = PG_GETARG_BOX_P(0);
	double		width,
				height;

	width = Abs(box->high.x - box->low.x);
	height = Abs(box->high.y - box->low.y);
	PG_RETURN_FLOAT8(width * height);
}

char *
reverse_name(char *string)
{
	int			i;
	int			len;
	char	   *new_string;

	new_string = palloc0(NAMEDATALEN);
	for (i = 0; i < NAMEDATALEN && string[i]; ++i)
		;
	if (i == NAMEDATALEN || !string[i])
		--i;
	len = i;
	for (; i >= 0; --i)
		new_string[len - i] = string[i];
	return new_string;
}

/*
 * This rather silly function is just to test that oldstyle functions
 * work correctly on toast-able inputs.
 */
int
oldstyle_length(int n, text *t)
{
	int			len = 0;

	if (t)
		len = VARSIZE(t) - VARHDRSZ;

	return n + len;
}

#include "executor/spi.h"		/* this is what you need to work with SPI */
#include "commands/trigger.h"	/* -"- and triggers */

static TransactionId fd17b_xid = InvalidTransactionId;
static TransactionId fd17a_xid = InvalidTransactionId;
static int	fd17b_level = 0;
static int	fd17a_level = 0;
static bool fd17b_recursion = true;
static bool fd17a_recursion = true;
extern Datum funny_dup17(PG_FUNCTION_ARGS);

PG_FUNCTION_INFO_V1(funny_dup17);

Datum
funny_dup17(PG_FUNCTION_ARGS)
{
	TriggerData *trigdata = (TriggerData *) fcinfo->context;
	TransactionId *xid;
	int		   *level;
	bool	   *recursion;
	Relation	rel;
	TupleDesc	tupdesc;
	HeapTuple	tuple;
	char	   *query,
			   *fieldval,
			   *fieldtype;
	char	   *when;
	int			inserted;
	int			selected = 0;
	int			ret;

	if (!CALLED_AS_TRIGGER(fcinfo))
		elog(ERROR, "funny_dup17: not fired by trigger manager");

	tuple = trigdata->tg_trigtuple;
	rel = trigdata->tg_relation;
	tupdesc = rel->rd_att;
	if (TRIGGER_FIRED_BEFORE(trigdata->tg_event))
	{
		xid = &fd17b_xid;
		level = &fd17b_level;
		recursion = &fd17b_recursion;
		when = "BEFORE";
	}
	else
	{
		xid = &fd17a_xid;
		level = &fd17a_level;
		recursion = &fd17a_recursion;
		when = "AFTER ";
	}

	if (!TransactionIdIsCurrentTransactionId(*xid))
	{