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344190b7ef
Removed char16 and replaced with an example using Point as suggested by Tom Lane. The dept field was changed to the cubicle field denoting the row(x) and column(y) of the employee's cube in the corporate jungle. The C function builds a 'compromise' cubicle from two suggested ones. I'll try and patchup the documentation next. Clark
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/******************************************************************************
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These are user-defined functions that can be bound to a Postgres backend
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and called by Postgres to execute SQL functions of the same name.
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The calling format for these functions is defined by the CREATE FUNCTION
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SQL statement that binds them to the backend.
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*****************************************************************************/
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#include <string.h>
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#include <stdio.h>
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#include "postgres.h" /* for variable length type */
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#include "utils/palloc.h" /* for palloc */
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#include "executor/executor.h" /* for GetAttributeByName() */
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#include "utils/geo_decls.h" /* for point type */
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/* The following prototypes declare what we assume the user declares to
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Postgres in his CREATE FUNCTION statement.
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*/
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int add_one(int arg);
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Point *makepoint(Point *pointx, Point *pointy );
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text *copytext(text *t);
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bool c_overpaid(TupleTableSlot *t, /* the current instance of EMP */
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int4 limit);
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int
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add_one(int arg)
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{
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return arg + 1;
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}
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Point *
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makepoint(Point *pointx, Point *pointy )
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{
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Point *new_point = (Point *) palloc(sizeof(Point));
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new_point->x = pointx->x;
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new_point->y = pointy->y;
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return new_point;
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}
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text *
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copytext(text *t)
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{
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/*
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* VARSIZE is the total size of the struct in bytes.
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*/
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text *new_t = (text *) palloc(VARSIZE(t));
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MemSet(new_t, 0, VARSIZE(t));
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VARSIZE(new_t) = VARSIZE(t);
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/*
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* VARDATA is a pointer to the data region of the struct.
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*/
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memcpy((void *) VARDATA(new_t), /* destination */
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(void *) VARDATA(t), /* source */
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VARSIZE(t) - VARHDRSZ); /* how many bytes */
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return new_t;
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}
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bool
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c_overpaid(TupleTableSlot *t, /* the current instance of EMP */
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int4 limit)
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{
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bool isnull = false;
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int4 salary;
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salary = (int4) GetAttributeByName(t, "salary", &isnull);
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if (isnull)
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return false;
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return salary > limit;
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}
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