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/*
Copyright (C) 2007-2010 Tuomas Suutari <thsuut@utu.fi>
This program 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.
This program 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 this program (see the file COPYING); if not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 USA.
*/
#include "DatabaseManagers.h"
#include "TransactionGuard.h"
#include "QueryErrors.h"
#include "QSqlConnection.h"
#include "Schema/MySQLCSG.h"
#include "Schema/PostgreSQLCSG.h"
#include "Schema/SQLiteCSG.h"
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlError>
#include <QVariant>
#include <QFile>
using namespace SQLDB;
namespace
{
static QString newDatabaseName(const QString& baseName)
{
// TODO: check that database name is not in use
static int i(0);
return baseName + QString::number(++i);
}
static void setConnectionParameters(QSqlDatabase& db,
const ConnectionParameters& connParams)
{
if (!connParams.isLocal()) {
db.setHostName(connParams.hostName());
if (connParams.port())
db.setPort(connParams.port());
}
if (!connParams.userName().isNull()) {
db.setUserName(connParams.userName());
if (!connParams.password().isNull())
db.setPassword(connParams.password());
}
}
}
BaseDatabaseManager::
BaseDatabaseManager(const ConnectionParameters& connParams,
const QString& driverName,
const QString& someDbName,
const QString& selDbsQuery,
Schema::CreateStatementGenerator::APtr csg):
_someDbName(someDbName),
_selDbsQuery(selDbsQuery),
_csg(csg),
_connName(newDatabaseName(QString::fromLatin1("dbmgr"))),
_db(QSqlDatabase::addDatabase(driverName, _connName))
{
setConnectionParameters(_db, connParams);
_db.setDatabaseName(_someDbName);
if (!_db.open())
throw QtSQLError(_db.lastError(), QLatin1String("Cannot open database"));
}
QStringList BaseDatabaseManager::databases() const
{
QSqlQuery q(_db);
if (!q.exec(_selDbsQuery))
throw QtSQLError(q, QLatin1String("Error while listing databases"));
QStringList dbList;
while (q.next())
dbList.push_back(q.value(0).toString());
return dbList;
}
void BaseDatabaseManager::
createDatabase(const QString& databaseName,
const Schema::DatabaseSchema& schema)
{
using namespace Schema;
QSqlQuery q(_db);
if (!q.exec(QLatin1String("CREATE DATABASE ") + databaseName))
throw QtSQLError(q, QLatin1String("Cannot create a database"));
ConnectionSPtr newDb = connectToDatabase(databaseName);
TransactionGuard transaction(*newDb);
const list<string>& x = _csg->generateCreateStatements(schema);
for (list<string>::const_iterator i = x.begin(); i != x.end(); ++i)
newDb->executeStatement(i->c_str());
transaction.commit();
}
ConnectionSPtr
BaseDatabaseManager::connectToDatabase(const QString& databaseName)
{
QString newConnName(newDatabaseName(QString::fromLatin1("conn")));
QSqlDatabase db = QSqlDatabase::cloneDatabase(_db, newConnName);
db.setDatabaseName(databaseName);
if (!db.open())
throw QtSQLError(db.lastError(), QLatin1String("Cannot connect to database"));
return ConnectionSPtr(new QSqlConnection(db));
}
MySQLDatabaseManager::
MySQLDatabaseManager(const ConnectionParameters& connParams):
BaseDatabaseManager(connParams,
QLatin1String("QMYSQL"),
QLatin1String("INFORMATION_SCHEMA"),
QLatin1String("SHOW DATABASES"),
Schema::CreateStatementGenerator::APtr
(new Schema::MySQLCSG()))
{
}
PostgreSQLDatabaseManager::
PostgreSQLDatabaseManager(const ConnectionParameters& connParams):
BaseDatabaseManager(connParams,
QLatin1String("QPSQL"),
QLatin1String("template1"),
QLatin1String("SELECT datname "
"FROM pg_catalog.pg_database "
"WHERE datallowconn "
"AND NOT datistemplate"),
Schema::CreateStatementGenerator::APtr
(new Schema::PostgreSQLCSG()))
{
}
QStringList SQLiteDatabaseManager::databases() const
{
return QStringList();
}
bool SQLiteDatabaseManager::databaseExists(const QString& databaseName) const
{
return QFile(databaseName).exists();
}
void
SQLiteDatabaseManager::createDatabase(const QString& databaseName,
const Schema::DatabaseSchema& schema)
{
using namespace Schema;
SQLiteCSG csg;
ConnectionSPtr newDb = connectToDatabase(databaseName);
TransactionGuard transaction(*newDb);
const list<string>& x = csg.generateCreateStatements(schema);
for (list<string>::const_iterator i = x.begin(); i != x.end(); ++i)
newDb->executeStatement(i->c_str());
transaction.commit();
}
ConnectionSPtr
SQLiteDatabaseManager::connectToDatabase(const QString& databaseName)
{
QString newConnName(newDatabaseName(QString::fromLatin1("conn")));
QSqlDatabase db = QSqlDatabase::addDatabase(QString::fromLatin1("QSQLITE"), newConnName);
db.setDatabaseName(databaseName);
if (!db.open())
throw QtSQLError(db.lastError(), QLatin1String("Cannot open SQLite database"));
return ConnectionSPtr(new QSqlConnection(db));
}
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