/sqlite3cc

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  • Committer: edam
  • Date: 2010-07-29 20:56:19 UTC
  • Revision ID: edam@waxworlds.org-20100729205619-a9yo4uzu647nvnsj
- renamed database to connection to better identify what it is (would database_connection be better though?)
- moved basic_statement and basic_transaction to sqlite::detail
- made sqlite::threadsafe() return the threading mode int, not a bool
- renamed row::index() to row_number() so it isn't confused with column index
- added typedef for deferred_transaction
- added early rollback method to transaction_guard
- allowed transaction_guard::~transaction_guard() to throw exceptions, since when it needs to, we're really screwed anyway
- bugfix: query::reset() didn't reset the internal row counter
- added query::num_results()
- added docs/design-notes
- reimplemented query::iterator so that increment() (which performs a step() on the query) now caches the returned row to be returned during dereference() (previously it stashed details and returned new row!?)
- bugfix: resetting active queries during rollbacks would hang!

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src/query.cc
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#include <sqlite3cc/query.h>
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#include <sqlite3cc/row.h>
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#include <sqlite3cc/database.h>
 
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#include <sqlite3cc/connection.h>
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#include <assert.h>
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sqlite::query::query(
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        database &database,
 
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        connection &connection,
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        const std::string &sql )
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        :
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        basic_statement( database, sql ),
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        _next_row( 0 )
 
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        basic_statement( connection, sql ),
 
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        _next_row_number( 0 )
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{
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        assert( sqlite3_column_count( _handle ) > 0 );
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}
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sqlite::query::query(
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        database &database )
 
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        connection &connection )
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        :
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        basic_statement( database ),
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        _next_row( 0 )
 
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        basic_statement( connection ),
 
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        _next_row_number( 0 )
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{
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}
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int sqlite::query::prepare(
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        const std::string &sql )
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{
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        _next_row = 0;
 
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        _next_row_number = 0;
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        int code = basic_statement::prepare( sql );
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        assert( code != SQLITE_OK || sqlite3_column_count( _handle ) > 0 );
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        return code;
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}
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int sqlite::query::reset()
 
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{
 
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        _next_row_number = 0;
 
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        return basic_statement::reset();
 
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}
 
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sqlite::row sqlite::query::step()
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{
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        database::database_mutex_guard lock( _database );
 
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        connection::mutex_guard lock( _connection );
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        int code = basic_statement::step();
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        if( code == SQLITE_DONE ) return row();
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        if( code == SQLITE_ROW ) return row( _handle, _next_row++ );
 
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        if( code == SQLITE_ROW ) return row( _handle, _next_row_number++ );
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        throw sqlite_error( _database, code );
 
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        throw sqlite_error( _connection, code );
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}
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}
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unsigned long long sqlite::query::num_results()
 
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{
 
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        reset();
 
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        unsigned long long count = 0;
 
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        while( step() ) count++;
 
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        reset();
 
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        return count;
 
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}
 
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sqlite::query::iterator::iterator(
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        sqlite::query &query,
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        bool valid )
 
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        bool step )
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        :
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        _query( query )
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{
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        if( valid )
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                increment();
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        else
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                _valid = false;
 
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        if( step ) increment();
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}
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sqlite::row sqlite::query::iterator::dereference() const
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{
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        return sqlite::row( _query._handle, _query._next_row++ );
 
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        return _row;
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}
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void sqlite::query::iterator::increment()
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{
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        _valid = _query.step();
 
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        _row = _query.step();
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}
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        sqlite::query::iterator const &other )
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        const
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{
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        return _valid == other._valid;
 
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        return _row == other._row;
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}
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sqlite::query::iterator sqlite::query::begin()
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{
 
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        reset();
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        return sqlite::query::iterator( *this, true );
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}
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