/usr/include/pqxx/subtransaction.hxx is in libpqxx3-dev 3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | /*-------------------------------------------------------------------------
*
* FILE
* pqxx/subtransaction.hxx
*
* DESCRIPTION
* definition of the pqxx::subtransaction class.
* pqxx::subtransaction is a nested transaction, i.e. one within a transaction
* DO NOT INCLUDE THIS FILE DIRECTLY; include pqxx/subtransaction instead.
*
* Copyright (c) 2005-2008, Jeroen T. Vermeulen <jtv@xs4all.nl>
*
* See COPYING for copyright license. If you did not receive a file called
* COPYING with this source code, please notify the distributor of this mistake,
* or contact the author.
*
*-------------------------------------------------------------------------
*/
#ifndef PQXX_H_SUBTRANSACTION
#define PQXX_H_SUBTRANSACTION
#include "pqxx/compiler-public.hxx"
#include "pqxx/compiler-internal-pre.hxx"
#include "pqxx/dbtransaction"
/* Methods tested in eg. self-test program test1 are marked with "//[t1]"
*/
namespace pqxx
{
/**
* @addtogroup transaction Transaction classes
*/
/// "Transaction" nested within another transaction
/** A subtransaction can be executed inside a backend transaction, or inside
* another subtransaction. This can be useful when, for example, statements in
* a transaction may harmlessly fail and you don't want them to abort the entire
* transaction. Here's an example of how a temporary table may be dropped
* before re-creating it, without failing if the table did not exist:
*
* @code
* void do_job(connection_base &C)
* {
* const string temptable = "fleetingtable";
*
* // Since we're dealing with a temporary table here, disallow automatic
* // recovery of the connection in case it breaks.
* C.inhibit_reactivation(true);
*
* work W(C, "do_job");
* do_firstpart(W);
*
* // Attempt to delete our temporary table if it already existed
* try
* {
* subtransaction S(W, "droptemp");
* W.exec("DROP TABLE " + temptable);
* }
* catch (const undefined_table &)
* {
* // Table did not exist. Which is what we were hoping to achieve anyway.
* // Carry on without regrets.
* }
*
* W.exec("CREATE TEMP TABLE " + fleetingtable +
* "(bar integer, splat varchar)");
*
* do_lastpart(W);
* }
* @endcode
*
* There are no isolation levels inside a transaction. They are not needed
* because all actions within the same backend transaction are always performed
* sequentially anyway.
*/
class PQXX_LIBEXPORT subtransaction :
public internal::transactionfocus,
public dbtransaction
{
public:
explicit subtransaction(dbtransaction &T,
const PGSTD::string &Name=PGSTD::string()); //[t88]
private:
virtual void do_begin(); //[t88]
virtual void do_commit(); //[t88]
virtual void do_abort(); //[t88]
void check_backendsupport() const;
dbtransaction &m_parent;
};
}
#include "pqxx/compiler-internal-post.hxx"
#endif
|