From: | TalGloz <glozmantal(at)gmail(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: PostgreSQL C Language Extension with C++ Code |
Date: | 2018-08-12 20:55:30 |
Message-ID: | 1534107330015-0.post@n3.nabble.com |
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Thread: | |
Lists: | pgsql-general |
OK It worked. This is how I did it, hopefully it is right
extern "C" {
#include <postgres.h>
#include <utils/rel.h>
#include <fmgr.h>
#include <utils/array.h>
#include <utils/builtins.h>
#include <catalog/pg_type.h>
#include <stdlib.h>
#include <stdint.h>
PG_MODULE_MAGIC;
}
#include <string>
#include <vector>
#include <iostream>
#include <fstream>
#include <seal/seal.h> // external compiled c++ library linked on running
'make'
extern "C" {
Datum sum_of_numbers(PG_FUNCTION_ARGS){
std::vector<int> numbers {23, 445, 64};
int sum = 0;
for (auto &item : numbers){
sum += item;
}
return sum;
};
PG_FUNCTION_INFO_V1(sum_of_numbers);
}
I've managed to create and execute the function in my PostgreSQL database.
So basically I can execute any CPP code as long as I declare my functions
like this:
extern "C" {
Datum function_name(PG_FUNCTION_ARGS){
// CPP code here
};
PG_FUNCTION_INFO_V1(function_name);
}
In addition tho thath, all the C headers should be * inside a extern "C" {
}* block and all the CPP headers *outside the extern "C" { }* block, did I
get it right?
Thanks,
Tal
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