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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
* pgwork.cc
*
* Wed Feb 26 14:49:37 CET 2014
* Copyright 2014 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of Pracro.
*
* Pracro is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Pracro is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pracro; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "pgwork.h"
#include <stdlib.h>
#include "debug.h"
/**
* Convert list of tuples to list of string arrays.
*/
static result_t toArray(PGresult *pg)
{
std::list<std::vector<std::string> > res;
for(int j = 0; j < PQntuples(pg); j++) {
std::vector<std::string> v;
for(int i = 0; i < PQnfields(pg); i++) {
v.push_back(std::string(PQgetvalue(pg, j, i)));
}
res.push_back(v);
}
return res;
}
class pq_exc : public std::exception {
public:
pq_exc(std::string _what) : w(_what) {}
~pq_exc() throw() {}
const char *what() { return w.c_str(); }
private:
std::string w;
};
Work::Work(PGconn *_c) throw(std::exception)
: c(_c)
{
state = WORK_OPEN;
try {
exec("BEGIN");
} catch(std::exception &e) {
ERR(db, "Error beginning transaction: %s\n", e.what());
state = WORK_INVALID;
throw e;
}
}
Work::~Work()
{
if(state == WORK_OPEN) abort();
}
/**
* Execute query and return result as list of string arrays.
*/
result_t Work::exec(const std::string &query)
throw(std::exception)
{
if(state != WORK_OPEN) {
ERR(db, "Transaction is not is not valid. Cannot execute query!\n");
return result_t();
}
PGresult *pg = PQexec(c, query.c_str());
if(PQresultStatus(pg) != PGRES_TUPLES_OK &&
PQresultStatus(pg) != PGRES_COMMAND_OK) {
throw pq_exc(PQerrorMessage(c));
}
result_t R = toArray(pg);
PQclear(pg);
return R;
}
void Work::commit()
throw(std::exception)
{
try {
exec("COMMIT");
} catch(std::exception &e) {
ERR(db, "Error committing transaction: %s\n", e.what());
throw e;
}
state = WORK_COMMITTED;
}
void Work::abort()
throw(std::exception)
{
try {
exec("ROLLBACK");
} catch(std::exception &e) {
ERR(db, "Error aborting transaction: %s\n", e.what());
throw e;
}
state = WORK_ABORTED;
}
std::string Work::esc(const std::string &from)
{
if(from == "") return "";
size_t buf_size = from.length() * 2 + 1;
char *buf = (char *)malloc(buf_size);
int error = 0;
size_t size = PQescapeStringConn(c, buf, from.data(),
from.length(), &error);
if(error) {
ERR(db, "SQL escaping failed due to invalid multibyte character"
" in '%s'\n", from.c_str());
return "";
}
std::string to;
if(size > 0 && error == 0) to.append(buf, size);
free(buf);
return to;
}
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