/sqlite3cc : contents of include/sqlite3cc/transaction.h at revision 11

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1 by edam - initial commit	1	/*
2 by edam - further initial development	2	* transaction.h
1 by edam - initial commit	3	*
	4	* Copyright (C) 2009 Tim Marston <edam@waxworlds.org>
	5	*
2 by edam - further initial development	6	* This file is part of sqlite3cc (hereafter referred to as "this program").
2 by edam - further initial development	7	* See http://www.waxworlds.org/edam/software/sqlite3cc for more information.
1 by edam - initial commit	8	*
	9	* This program is free software: you can redistribute it and/or modify
	10	* it under the terms of the GNU Lesser General Public License as published
	11	* by the Free Software Foundation, either version 3 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU Lesser General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU Lesser General Public License
	20	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	21	*/
	22
2 by edam - further initial development	23	#ifndef SQLITE3CC_TRANSACTION_H_
2 by edam - further initial development	24	#define SQLITE3CC_TRANSACTION_H_
1 by edam - initial commit	25
	26
	27	#include <boost/utility.hpp>
11 by edam - update TODO	28	#include <string>
1 by edam - initial commit	29
	30
	31	namespace sqlite
	32	{
	33
	34
	35	class database;
	36
	37
3 by edam - rewrote transaction classes and added transaction_guard	38	class basic_transaction
1 by edam - initial commit	39	:
	40	private boost::noncopyable
	41	{
	42	//______________________________________________________________________________
	43	// instantiation
	44	public:
	45
	46	/**
	47	* Constructor that provides a database upon which to act
	48	* @param database a database
	49	*/
3 by edam - rewrote transaction classes and added transaction_guard	50	explicit basic_transaction(
1 by edam - initial commit	51	database &database );
	52
	53	//______________________________________________________________________________
	54	// public interface
3 by edam - rewrote transaction classes and added transaction_guard	55	public:
	56
	57	/**
	58	* Begin the transaction
	59	*/
	60	virtual void begin();
1 by edam - initial commit	61
	62	/**
	63	* Commit the transaction
	64	*/
	65	virtual void commit();
	66
	67	/**
	68	* Rollback the transaction
	69	*/
3 by edam - rewrote transaction classes and added transaction_guard	70	virtual void rollback();
1 by edam - initial commit	71
	72	//______________________________________________________________________________
	73	// implementation
	74	protected:
	75
3 by edam - rewrote transaction classes and added transaction_guard	76	/* the database on which to act */
1 by edam - initial commit	77	database &_database;
	78
	79	};
	80
	81
	82	////////////////////////////////////////////////////////////////////////////////
	83
	84
	85	class exclusive_transaction
	86	:
3 by edam - rewrote transaction classes and added transaction_guard	87	public basic_transaction
	88	{
	89	//______________________________________________________________________________
	90	// instantiation
	91	public:
	92
	93	/**
	94	* Constructor that provides a database upon which to act
	95	* @param database a database
	96	*/
	97	explicit exclusive_transaction(
	98	database &database );
	99
	100	//______________________________________________________________________________
	101	// public interface
	102	public:
	103
	104	/**
	105	* Begin the transaction
	106	*/
	107	virtual void begin();
	108
	109	};
	110
	111
	112	////////////////////////////////////////////////////////////////////////////////
	113
	114
	115	class recursive_transaction
	116	:
	117	public basic_transaction
	118	{
	119	//______________________________________________________________________________
	120	// instantiation
	121	public:
	122
	123	/**
	124	* Constructor that provides a database upon which to act
	125	* @param database a database
	126	*/
	127	explicit recursive_transaction(
	128	database &database );
	129
	130	//______________________________________________________________________________
	131	// public interface
	132	public:
	133
	134	/**
	135	* Begin the transaction
	136	*/
	137	virtual void begin();
	138
	139	/**
	140	* Commit the transaction
	141	*/
	142	virtual void commit();
	143
	144	/**
	145	* Rollback the transaction
	146	*/
	147	virtual void rollback();
	148
	149	//______________________________________________________________________________
	150	// implementation
151	protected:
152
153	/* this transaction's savepoint name */
154	std::string _sp_name;
155
156	};
157
158
159	////////////////////////////////////////////////////////////////////////////////
160
161
162	template< class T = basic_transaction >
163	class transaction_guard
164	:
165	private boost::noncopyable
166	{
167	//______________________________________________________________________________
168	// instantiation
169	public:
170
171	/**
172	* Constructor that provides a database upon which to act
173	* @param database a database
174	*/
175	explicit transaction_guard(
176	database &database )
177	:
178	_transaction( database ),
179	_released( false )
180	{
181	_transaction.begin();
182	}
183
184	~transaction_guard()
185	{
11 by edam - update TODO	186	if( !_released ) {
	187	try {
	188	_transaction.rollback();
	189	}
	190	catch( ... ) {
	191	}
	192	}
3 by edam - rewrote transaction classes and added transaction_guard	193	}
	194
	195	//______________________________________________________________________________
	196	// public interface
	197	public:
	198
	199	/**
	200	* Commit the transaction
	201	*/
	202	void commit()
	203	{
	204	if( !_released ) {
	205	_transaction.commit();
	206	_released = true;
	207	}
	208	}
	209
	210	//______________________________________________________________________________
	211	// implementation
	212	protected:
	213
	214	/* the transaction */
	215	T _transaction;
	216
	217	/* have we released the transaction yet? */
	218	bool _released;
1 by edam - initial commit	219
	220	};
	221
	222
2 by edam - further initial development	223	} // namespace sqlite
	224
	225
	226	#endif /* SQLITE3CC_TRANSACTION_H_ */