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/*
Copyright (C) 2006-2010 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 "QSqlConnection.h"
#include "QueryErrors.h"
#include "Utilities/QStr.h"
#include <QList>
#include <QSqlField>
#include <QSqlDriver>
#include <QSqlError>
#include <memory>
using namespace SQLDB;
// To print debug message for each executed SQL query
//#define DEBUG_QUERYS
QSqlConnection::QSqlConnection(const QSqlDatabase& database):
_database(database),
_driver(_database.driver())
{
if (!_driver)
throw InitializationError();
// TODO: There should be some kind of a check for this in
// somewhere else and notification for the user too
Q_ASSERT(_driver->hasFeature(QSqlDriver::LastInsertId));
}
QString QSqlConnection::variantListAsSql(const QList<QVariant>& l) const
{
QStringList repr;
QSqlField f;
for (QList<QVariant>::const_iterator i = l.begin();
i != l.end(); ++i) {
f.setType(i->type());
f.setValue(*i);
repr << _driver->formatValue(f);
}
if (repr.isEmpty())
return QLatin1String("NULL");
else
return repr.join(QLatin1String(","));
}
void QSqlConnection::processListParameters(QString& query,
Bindings& bindings) const
{
int mark = 0;
Bindings::iterator i = bindings.begin();
while (i != bindings.end()) {
mark = query.indexOf(QChar::fromLatin1('?'), mark);
if (mark == -1)
break;
QList<QVariant> iAsList(i->toList());
if (!iAsList.isEmpty()) {
// val contained a list
QString sql = variantListAsSql(iAsList);
query.replace(mark, 1, sql);
i = bindings.erase(i);
mark += sql.length();
}
else {
// val did not contain a list (or it contained an empty
// list, which should never be passed as a binding)
++i;
++mark;
}
}
}
void QSqlConnection::bindValues(QSqlQuery& query, const Bindings& b) const
{
int n = 0;
for (Bindings::const_iterator i = b.begin(); i != b.end(); ++i) {
query.bindValue(n, *i);
++n;
}
}
std::auto_ptr<QSqlQuery>
QSqlConnection::initializeQuery(const QString& statement,
const Bindings& bindings) const
{
QString queryStr(statement);
Bindings b(bindings);
processListParameters(queryStr, b);
std::auto_ptr<QSqlQuery> query(new QSqlQuery(_database));
if (!query->prepare(queryStr))
throw QtSQLError(*query, QLatin1String("Could not prepare a query"));
bindValues(*query, b);
#ifdef DEBUG_QUERYS
int lastPos = 0;
for (Bindings::const_iterator i = b.begin(); i != b.end(); ++i) {
lastPos = queryStr.indexOf(QChar::fromLatin1('?'), lastPos);
if (lastPos == -1)
break;
QString x = i->toString();
if (i->type() == QVariant::String ||
i->type() == QVariant::DateTime ||
i->type() == QVariant::Date ||
i->type() == QVariant::Time)
x = QChar::fromLatin1('\'') + x.replace(QChar::fromLatin1('\''), QString::fromLatin1("''")) + QChar::fromLatin1('\'');
queryStr.replace(lastPos, 1, x);
lastPos += x.length();
}
qDebug("Initialized SQL: %s", queryStr.toLocal8Bit().constData());
#endif
return query;
}
QueryResult QSqlConnection::executeQuery(const char* query,
const Bindings& bindings) const
{
std::auto_ptr<QSqlQuery> q(
initializeQuery(QString::fromUtf8(query), bindings));
#ifdef DEBUG_QUERY_TIMES
QTime t;
t.start();
#endif
if (!q->exec())
throw QtSQLError(*q, QLatin1String("Error while excuting a query"));
#ifdef DEBUG_QUERY_TIMES
int te = t.elapsed();
if (te > 100) {
{
queryTimes.push_back(QPair<QString, uint>(q->executedQuery(), te));
}
}
qDebug("Time elapsed: %d ms", te);
#endif
return QueryResult(q);
}
void QSqlConnection::executeStatement(const char* statement,
const Bindings& bindings)
{
std::auto_ptr<QSqlQuery> s(
initializeQuery(QString::fromUtf8(statement), bindings));
if (!s->exec())
throw QtSQLError(*s, QLatin1String("Error while excuting a statement"));
}
QSqlConnection::RowId
QSqlConnection::executeInsert(const QString& tableName,
const QString& aiFieldName,
const QStringList& fields,
const Bindings& values)
{
Q_ASSERT(fields.count() == values.count());
QString q = QString::fromLatin1("INSERT INTO %1(%2) VALUES (%3)");
q = q.arg(tableName);
q = q.arg(fields.join(QString::fromLatin1(", ")));
QStringList l;
for (Bindings::size_type i = values.count(); i > 0; --i)
l.append(QString::fromLatin1("?"));
q = q.arg(l.join(QString::fromLatin1(", ")));
std::auto_ptr<QSqlQuery> s(initializeQuery(q, values));
if (!s->exec())
throw QtSQLError(*s, QLatin1String("Error while excuting an insert statement"));
Q_UNUSED(aiFieldName);
const QVariant idVariant = s->lastInsertId();
Q_ASSERT(!idVariant.isNull());
return idVariant.toULongLong();
}
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