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/*
* The Mana Server
* Copyright (C) 2004-2010 The Mana World Development Team
*
* This file is part of The Mana Server.
*
* The Mana Server 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
* any later version.
*
* The Mana Server 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 The Mana Server. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pqdataprovider.h"
#include "dalexcept.h"
namespace dal
{
/**
* Constructor
*/
PqDataProvider::PqDataProvider()
throw()
: mDb(0)
{
}
/**
* Destructor
*/
PqDataProvider::~PqDataProvider()
throw()
{
if (mIsConnected)
disconnect();
}
/**
* Get the database backend name.
*/
DbBackends PqDataProvider::getDbBackend() const
throw()
{
return DB_BKEND_POSTGRESQL;
}
/**
* Create a connection to the database.
*/
void PqDataProvider::connect(const std::string& dbName,
const std::string& userName,
const std::string& password)
{
// Create string to pass to PQconnectdb
std::string connStr = "dbname = " + dbName + " "; // database name
if (userName != "")
connStr += "user = " + userName + " "; // username
if (password != "")
connStr += "password = " + password; // password
// Connect to database
mDb = PQconnectdb(connStr.c_str());
if (PQstatus(mDb) != CONNECTION_OK)
{
std::string error = PQerrorMessage(mDb);
PQfinish(mDb);
throw DbConnectionFailure(error);
}
// Save the Db Name.
mDbName = dbName;
mIsConnected = true;
}
/**
* Execute a SQL query.
*/
const RecordSet &PqDataProvider::execSql(const std::string& sql,
const bool refresh)
{
if (!mIsConnected)
throw std::runtime_error("not connected to database");
if (refresh || (sql != mSql))
{
mRecordSet.clear();
// execute the query
PGresult *res;
res = PQexec(mDb, sql.c_str());
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
PQclear(res);
throw DbSqlQueryExecFailure(PQerrorMessage(mDb));
}
// get field count
unsigned int nFields = PQnfields(res);
// fill column names
Row fieldNames;
for (unsigned int i = 0; i < nFields; i++)
{
fieldNames.push_back(PQfname(res, i));
}
mRecordSet.setColumnHeaders(fieldNames);
// fill rows
for (unsigned int r = 0; r < PQntuples(res); r++)
{
Row row;
for (unsigned int i = 0; i < nFields; i++)
row.push_back(PQgetvalue(res, r, i));
mRecordSet.add(row);
}
// clear results
PQclear(res);
}
return mRecordSet;
}
/**
* Close connection to database.
*/
void PqDataProvider::disconnect()
{
if (!mIsConnected)
return;
// finish up with Postgre.
PQfinish(mDb);
mDb = 0;
mIsConnected = false;
}
} // namespace dal
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