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/*
* The Mana World Server
* Copyright 2004 The Mana World Development Team
*
* This file is part of The Mana World.
*
* The Mana World 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 World 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 World; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id$
*/
#include "sqlitedataprovider.h"
namespace tmwserv
{
namespace dal
{
/**
* Constructor.
*/
SqLiteDataProvider::SqLiteDataProvider(void)
throw()
: mDb(0)
{
// NOOP
}
/**
* Destructor.
*/
SqLiteDataProvider::~SqLiteDataProvider(void)
throw()
{
try {
// make sure that the database is closed.
// disconnect() calls sqlite3_close() which takes care of freeing
// the memory allocated for the handle.
if (mIsConnected) {
disconnect();
}
}
catch (...) {
// ignore
}
}
/**
* Get the name of the database backend.
*/
DbBackends
SqLiteDataProvider::getDbBackend(void) const
throw()
{
return DB_BKEND_SQLITE;
}
/**
* Create a connection to the database.
*/
void
SqLiteDataProvider::connect(const std::string& dbName,
const std::string& userName,
const std::string& password)
{
// sqlite3_open creates the database file if it does not exist
// as a side-effect.
if (sqlite3_open(dbName.c_str(), &mDb) != SQLITE_OK) {
// save the error message thrown by sqlite3_open()
// as we may lose it when sqlite3_close() runs.
std::string msg(sqlite3_errmsg(mDb));
// the SQLite3 documentation suggests that we try to close
// the database after an unsuccessful call to sqlite3_open().
sqlite3_close(mDb);
// FIXME
// 21-Jun-2005: although we did invoke sqlite3_close(), there
// seems to be still a leak of 136 bytes here.
throw DbConnectionFailure(msg);
}
mIsConnected = true;
}
/**
* Execute a SQL query.
*/
const RecordSet&
SqLiteDataProvider::execSql(const std::string& sql,
const bool refresh)
{
if (!mIsConnected) {
throw std::runtime_error("not connected to database");
}
// do something only if the query is different from the previous
// or if the cache must be refreshed
// otherwise just return the recordset from cache.
if (refresh || (sql != mSql)) {
char** result;
int nRows;
int nCols;
char* errMsg;
mRecordSet.clear();
int errCode = sqlite3_get_table(
mDb, // an open database
sql.c_str(), // SQL to be executed
&result, // result of the query
&nRows, // number of result rows
&nCols, // number of result columns
&errMsg // error msg
);
if (errCode != SQLITE_OK) {
std::string msg(sqlite3_errmsg(mDb));
// free memory
sqlite3_free_table(result);
delete errMsg;
throw DbSqlQueryExecFailure(msg);
}
// the first row of result[] contains the field names.
Row fieldNames;
for(int col = 0; col < nCols; ++col) {
fieldNames.push_back(result[col]);
}
mRecordSet.setColumnHeaders(fieldNames);
// populate the RecordSet
for (int row = 0; row < nRows; ++row) {
Row r;
for(int col = 0; col < nCols; ++col) {
r.push_back(result[nCols + (row * nCols) + col]);
}
mRecordSet.add(r);
}
// free memory
sqlite3_free_table(result);
delete errMsg;
}
return mRecordSet;
}
/**
* Close the connection to the database.
*/
void
SqLiteDataProvider::disconnect(void)
{
if (!isConnected()) {
return;
}
// sqlite3_close() closes the connection and deallocates the connection
// handle.
if (sqlite3_close(mDb) != SQLITE_OK) {
throw DbDisconnectionFailure(sqlite3_errmsg(mDb));
}
mDb = 0;
mIsConnected = false;
}
} // namespace dal
} // namespace tmwserv
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