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79 lines
1.8 KiB
C
79 lines
1.8 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 "postgres.h" /* for variable length type */
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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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