/sqlite3cc : contents of include/sqlite3cc/transaction.h at revision 14

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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
12 by edam - moved null_t, exec_t and set_index_t to detail namespace so only their extern instantiations are in the main namespace	38	/**
	39	* A basic (default, deferred) transaction.
	40	*/
3 by edam - rewrote transaction classes and added transaction_guard	41	class basic_transaction
1 by edam - initial commit	42	:
	43	private boost::noncopyable
	44	{
	45	//______________________________________________________________________________
	46	// instantiation
	47	public:
	48
	49	/**
	50	* Constructor that provides a database upon which to act
	51	* @param database a database
	52	*/
3 by edam - rewrote transaction classes and added transaction_guard	53	explicit basic_transaction(
1 by edam - initial commit	54	database &database );
	55
	56	//______________________________________________________________________________
	57	// public interface
3 by edam - rewrote transaction classes and added transaction_guard	58	public:
	59
	60	/**
	61	* Begin the transaction
	62	*/
	63	virtual void begin();
1 by edam - initial commit	64
	65	/**
	66	* Commit the transaction
	67	*/
	68	virtual void commit();
	69
	70	/**
	71	* Rollback the transaction
	72	*/
3 by edam - rewrote transaction classes and added transaction_guard	73	virtual void rollback();
1 by edam - initial commit	74
	75	//______________________________________________________________________________
	76	// implementation
	77	protected:
	78
13 by edam - made basic_statement::step() protected, for use by query and command only	79	/** close any in-progress statements */
	80	void invalidate_queries();
	81
	82	/** the database on which to act */
1 by edam - initial commit	83	database &_database;
	84
	85	};
	86
	87
	88	////////////////////////////////////////////////////////////////////////////////
	89
	90
12 by edam - moved null_t, exec_t and set_index_t to detail namespace so only their extern instantiations are in the main namespace	91	/**
	92	* An exclusive transaction
	93	*/
	94	class immediate_transaction
	95	:
	96	public basic_transaction
	97	{
	98	//______________________________________________________________________________
	99	// instantiation
	100	public:
	101
	102	/**
	103	* Constructor that provides a database upon which to act
	104	* @param database a database
	105	*/
	106	explicit immediate_transaction(
	107	database &database );
	108
	109	//______________________________________________________________________________
	110	// public interface
	111	public:
	112
	113	/**
	114	* Begin the transaction
	115	*/
	116	virtual void begin();
	117
	118	};
	119
	120
	121	////////////////////////////////////////////////////////////////////////////////
	122
	123
	124	/**
	125	* An exclusive transaction
	126	*/
1 by edam - initial commit	127	class exclusive_transaction
1 by edam - initial commit	128	:
3 by edam - rewrote transaction classes and added transaction_guard	129	public basic_transaction
	130	{
	131	//______________________________________________________________________________
	132	// instantiation
	133	public:
	134
	135	/**
	136	* Constructor that provides a database upon which to act
	137	* @param database a database
	138	*/
	139	explicit exclusive_transaction(
	140	database &database );
	141
	142	//______________________________________________________________________________
	143	// public interface
	144	public:
	145
	146	/**
	147	* Begin the transaction
	148	*/
	149	virtual void begin();
	150
	151	};
	152
	153
	154	////////////////////////////////////////////////////////////////////////////////
	155
	156
12 by edam - moved null_t, exec_t and set_index_t to detail namespace so only their extern instantiations are in the main namespace	157	/**
	158	* A recursive transaction, allowing transactions to be nested.
	159	*/
3 by edam - rewrote transaction classes and added transaction_guard	160	class recursive_transaction
	161	:
	162	public basic_transaction
	163	{
	164	//______________________________________________________________________________
	165	// instantiation
	166	public:
	167
	168	/**
	169	* Constructor that provides a database upon which to act
	170	* @param database a database
	171	*/
	172	explicit recursive_transaction(
	173	database &database );
	174
	175	//______________________________________________________________________________
	176	// public interface
	177	public:
	178
	179	/**
	180	* Begin the transaction
	181	*/
	182	virtual void begin();
	183
	184	/**
	185	* Commit the transaction
	186	*/
	187	virtual void commit();
	188
	189	/**
	190	* Rollback the transaction
	191	*/
	192	virtual void rollback();
	193
	194	//______________________________________________________________________________
	195	// implementation
	196	protected:
	197
	198	/* this transaction's savepoint name */
	199	std::string _sp_name;
	200
	201	};
	202
	203
	204	////////////////////////////////////////////////////////////////////////////////
	205
	206
12 by edam - moved null_t, exec_t and set_index_t to detail namespace so only their extern instantiations are in the main namespace	207	/**
	208	* A scope guard, or sentinel for use with one of the transaction classes.
	209	*/
3 by edam - rewrote transaction classes and added transaction_guard	210	template< class T = basic_transaction >
	211	class transaction_guard
	212	:
	213	private boost::noncopyable
	214	{
	215	//______________________________________________________________________________
	216	// instantiation
	217	public:
	218
	219	/**
	220	* Constructor that provides a database upon which to act
	221	* @param database a database
	222	*/
	223	explicit transaction_guard(
	224	database &database )
	225	:
	226	_transaction( database ),
	227	_released( false )
	228	{
	229	_transaction.begin();
	230	}
	231
	232	~transaction_guard()
	233	{
11 by edam - update TODO	234	if( !_released ) {
	235	try {
	236	_transaction.rollback();
	237	}
	238	catch( ... ) {
	239	}
	240	}
3 by edam - rewrote transaction classes and added transaction_guard	241	}
	242
	243	//______________________________________________________________________________
	244	// public interface
	245	public:
	246
	247	/**
	248	* Commit the transaction
	249	*/
	250	void commit()
	251	{
	252	if( !_released ) {
	253	_transaction.commit();
	254	_released = true;
	255	}
	256	}
	257
	258	//______________________________________________________________________________
	259	// implementation
	260	protected:
	261
13 by edam - made basic_statement::step() protected, for use by query and command only	262	/** the transaction */
3 by edam - rewrote transaction classes and added transaction_guard	263	T _transaction;
	264
13 by edam - made basic_statement::step() protected, for use by query and command only	265	/** have we released the transaction yet? */
3 by edam - rewrote transaction classes and added transaction_guard	266	bool _released;
1 by edam - initial commit	267
	268	};
	269
	270
2 by edam - further initial development	271	} // namespace sqlite
	272
	273
	274	#endif /* SQLITE3CC_TRANSACTION_H_ */