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/*
* query.cc
*
* Copyright (C) 2009 Tim Marston <tim@ed.am>
*
* This file is part of sqlite3cc (hereafter referred to as "this program").
* See http://ed.am/dev/sqlite3cc for more information.
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sqlite3cc/query.h>
#include <sqlite3cc/row.h>
#include <sqlite3cc/connection.h>
#include <cassert>
sqlite::query::query(
connection &connection,
const std::string &sql )
:
basic_statement( connection, sql ),
_next_row_number( 0 )
{
assert( sqlite3_column_count( _handle ) > 0 );
}
sqlite::query::query(
connection &connection )
:
basic_statement( connection ),
_next_row_number( 0 )
{
}
int sqlite::query::prepare(
const std::string &sql )
{
_next_row_number = 0;
int code = basic_statement::prepare( sql );
assert( code != SQLITE_OK || sqlite3_column_count( _handle ) > 0 );
return code;
}
int sqlite::query::reset()
{
_next_row_number = 0;
return basic_statement::reset();
}
sqlite::row sqlite::query::step()
{
connection::mutex_guard lock( _connection );
int code = basic_statement::step();
if( code == SQLITE_DONE ) return row();
if( code == SQLITE_ROW ) return row( _handle, _next_row_number++ );
throw sqlite_error( _connection, code );
}
unsigned int sqlite::query::column_count()
{
return sqlite3_column_count( _handle );
}
const std::string sqlite::query::column_name(
unsigned int index )
{
assert( index <
static_cast< unsigned int >( sqlite3_column_count( _handle ) ) );
return sqlite3_column_name( _handle, index );
}
unsigned long long sqlite::query::num_results()
{
reset();
unsigned long long count = 0;
while( step() ) count++;
reset();
return count;
}
sqlite::query::iterator::iterator(
sqlite::query &query,
bool step )
:
_query( query )
{
if( step ) increment();
}
sqlite::row sqlite::query::iterator::dereference() const
{
return _row;
}
void sqlite::query::iterator::increment()
{
_row = _query.step();
}
bool sqlite::query::iterator::equal(
sqlite::query::iterator const &other )
const
{
return _row == other._row;
}
sqlite::query::iterator sqlite::query::begin()
{
reset();
return sqlite::query::iterator( *this, true );
}
sqlite::query::iterator sqlite::query::end()
{
return sqlite::query::iterator( *this, false );
}
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