mirror of
https://github.com/postgres/postgres.git
synced 2025-04-29 13:56:47 +03:00
d08741eab5
are now separate files "postgres.h" and "postgres_fe.h", which are meant to be the primary include files for backend .c files and frontend .c files respectively. By default, only include files meant for frontend use are installed into the installation include directory. There is a new make target 'make install-all-headers' that adds the whole content of the src/include tree to the installed fileset, for use by people who want to develop server-side code without keeping the complete source tree on hand. Cleaned up a whole lot of crufty and inconsistent header inclusions.
106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/******************************************************************************
|
|
These are user-defined functions that can be bound to a Postgres backend
|
|
and called by Postgres to execute SQL functions of the same name.
|
|
|
|
The calling format for these functions is defined by the CREATE FUNCTION
|
|
SQL statement that binds them to the backend.
|
|
|
|
NOTE: this file shows examples of "old style" function call conventions.
|
|
See funcs_new.c for examples of "new style".
|
|
*****************************************************************************/
|
|
|
|
#include "postgres.h" /* general Postgres declarations */
|
|
|
|
#include "executor/executor.h" /* for GetAttributeByName() */
|
|
#include "utils/geo_decls.h" /* for point type */
|
|
|
|
|
|
/* These prototypes just prevent possible warnings from gcc. */
|
|
|
|
int add_one(int arg);
|
|
float8 *add_one_float8(float8 *arg);
|
|
Point *makepoint(Point *pointx, Point *pointy);
|
|
text *copytext(text *t);
|
|
text *concat_text(text *arg1, text *arg2);
|
|
bool c_overpaid(TupleTableSlot *t, /* the current instance of EMP */
|
|
int32 limit);
|
|
|
|
|
|
/* By Value */
|
|
|
|
int
|
|
add_one(int arg)
|
|
{
|
|
return arg + 1;
|
|
}
|
|
|
|
/* By Reference, Fixed Length */
|
|
|
|
float8 *
|
|
add_one_float8(float8 *arg)
|
|
{
|
|
float8 *result = (float8 *) palloc(sizeof(float8));
|
|
|
|
*result = *arg + 1.0;
|
|
|
|
return result;
|
|
}
|
|
|
|
Point *
|
|
makepoint(Point *pointx, Point *pointy)
|
|
{
|
|
Point *new_point = (Point *) palloc(sizeof(Point));
|
|
|
|
new_point->x = pointx->x;
|
|
new_point->y = pointy->y;
|
|
|
|
return new_point;
|
|
}
|
|
|
|
/* By Reference, Variable Length */
|
|
|
|
text *
|
|
copytext(text *t)
|
|
{
|
|
/*
|
|
* VARSIZE is the total size of the struct in bytes.
|
|
*/
|
|
text *new_t = (text *) palloc(VARSIZE(t));
|
|
VARATT_SIZEP(new_t) = VARSIZE(t);
|
|
/*
|
|
* VARDATA is a pointer to the data region of the struct.
|
|
*/
|
|
memcpy((void *) VARDATA(new_t), /* destination */
|
|
(void *) VARDATA(t), /* source */
|
|
VARSIZE(t)-VARHDRSZ); /* how many bytes */
|
|
return new_t;
|
|
}
|
|
|
|
text *
|
|
concat_text(text *arg1, text *arg2)
|
|
{
|
|
int32 new_text_size = VARSIZE(arg1) + VARSIZE(arg2) - VARHDRSZ;
|
|
text *new_text = (text *) palloc(new_text_size);
|
|
|
|
memset((void *) new_text, 0, new_text_size);
|
|
VARATT_SIZEP(new_text) = new_text_size;
|
|
strncpy(VARDATA(new_text), VARDATA(arg1), VARSIZE(arg1)-VARHDRSZ);
|
|
strncat(VARDATA(new_text), VARDATA(arg2), VARSIZE(arg2)-VARHDRSZ);
|
|
return new_text;
|
|
}
|
|
|
|
/* Composite types */
|
|
|
|
bool
|
|
c_overpaid(TupleTableSlot *t, /* the current instance of EMP */
|
|
int32 limit)
|
|
{
|
|
bool isnull;
|
|
int32 salary;
|
|
|
|
salary = DatumGetInt32(GetAttributeByName(t, "salary", &isnull));
|
|
if (isnull)
|
|
return (false);
|
|
return salary > limit;
|
|
}
|