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/* |
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* query.h |
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* |
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* Copyright (C) 2009 Tim Marston <tim@ed.am> |
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* |
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* This file is part of sqlite3cc (hereafter referred to as "this program"). |
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* See http://ed.am/dev/sqlite3cc for more information. |
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* |
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* This program is free software: you can redistribute it and/or modify it under |
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* the terms of the GNU Lesser General Public License as published by the Free |
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* Software Foundation, either version 3 of the License, or (at your option) any |
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* later version. |
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* |
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* This program is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more |
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* details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#ifndef SQLITE3CC_QUERY_H_ |
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#define SQLITE3CC_QUERY_H_ |
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#include <boost/iterator/iterator_facade.hpp> |
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#include <sqlite3cc/basic_statement.h> |
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#include <sqlite3cc/row.h> |
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#include <string> |
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namespace sqlite |
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{ |
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class query |
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: |
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public detail::basic_statement |
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//______________________________________________________________________________ |
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// instantiation |
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public: |
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/** |
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* Constructor that provides a connection upon which to act and the SQL |
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* query to execute. |
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* |
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* @param connection a reference to a connection |
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* @param sql an SQL statement in UTF-8 |
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*/ |
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explicit query( |
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connection &connection, |
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const std::string &sql ); |
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/** |
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* Constructor that provides a connection upon which to act. |
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* |
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* @param connection a reference to a connection |
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*/ |
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explicit query( |
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connection &connection ); |
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//______________________________________________________________________________ |
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// public interface |
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public: |
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/** |
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* Prepare an SQL statement. |
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* |
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* @param sql an SQL statement in UTF-8 |
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* @returns an sqlite error code |
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* @see sqlite3_prepare_v2() |
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*/ |
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virtual int prepare( |
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const std::string &sql ); |
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/** |
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* Reset the statement, ready to re-execute it. This does not clear any of |
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* the values bound to the statement. |
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* |
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* @returns an sqlite error code |
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* @see sqlite3_reset() |
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*/ |
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virtual int reset(); |
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/** |
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* Perform a step() and return row object that can be used to retrieve the |
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* results. |
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* |
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* @return a row object |
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*/ |
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row step(); |
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/** |
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* Get the number of columns in the results. |
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* |
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* @see sqlite3_column_count() |
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*/ |
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unsigned int column_count(); |
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/** |
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* Get the name of a column in the results. |
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* |
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* @param index column index |
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* @see sqlite3_column_name() |
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*/ |
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const std::string column_name( |
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unsigned int index ); |
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/** |
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* Gets the number of results. Be aware that this merely step()s over the |
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* results and counts them, which is something you could do yourself. This |
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* method is intended to be used for convenience, where you only need know |
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* the number of results and not what they are. You could also execute some |
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* SQL like this: "SELECT COUNT(*) ...", but this only causes SQLite to |
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* internally do the same counting as this method does. Also note that this |
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* method reset()s the query. |
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* |
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* @returns the number of results |
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*/ |
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unsigned long long num_results(); |
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/** |
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* Query iterator which can be used to obtain rows. |
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*/ |
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class iterator |
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public boost::iterator_facade< iterator, row, |
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boost::single_pass_traversal_tag, row > |
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{ |
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public: |
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explicit iterator( query &query, bool step ); |
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private: |
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friend class boost::iterator_core_access; |
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row dereference() const; |
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void increment(); |
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bool equal( iterator const &other ) const; |
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/** the current row */ |
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row _row; |
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/** the query */ |
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query &_query; |
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}; |
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/** |
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* Get an iterator to the initial row. Note that creating an iterator |
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* causes step() to be called, so it should only be called to begin |
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* iterating over the rows and not for comparison. |
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* |
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* @return a query iterator |
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*/ |
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iterator begin(); |
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/** |
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* Get an iterator to after the last row (i.e., an invalid row). |
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* |
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* @return an invalid query iterator |
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*/ |
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iterator end(); |
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//______________________________________________________________________________ |
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// implementation |
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private: |
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/** next row number */ |
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unsigned long long _next_row_number; |
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}; |
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} // namespace sqlite |
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#endif /* SQLITE3CC_QUERY_H_ */ |