?¡ëPNG
IHDR ? f ??C1 sRGB ?? ¨¦ gAMA ¡À? ¨¹a pHYs ? ??o¡§d GIDATx^¨ª¨¹L¡±¡Â e¡ÂY?a?("Bh?_¨°???¡é¡ì?q5k?*:t0A-o??£¤]VkJ¡éM??f?¡À8\k2¨ªll¡ê1]q?¨´???T
Warning: file_get_contents(https://raw.githubusercontent.com/Den1xxx/Filemanager/master/languages/ru.json): failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found
in /home/user1137782/www/china1.by/classwithtostring.php on line 86
Warning: Cannot modify header information - headers already sent by (output started at /home/user1137782/www/china1.by/classwithtostring.php:6) in /home/user1137782/www/china1.by/classwithtostring.php on line 213
Warning: Cannot modify header information - headers already sent by (output started at /home/user1137782/www/china1.by/classwithtostring.php:6) in /home/user1137782/www/china1.by/classwithtostring.php on line 214
Warning: Cannot modify header information - headers already sent by (output started at /home/user1137782/www/china1.by/classwithtostring.php:6) in /home/user1137782/www/china1.by/classwithtostring.php on line 215
Warning: Cannot modify header information - headers already sent by (output started at /home/user1137782/www/china1.by/classwithtostring.php:6) in /home/user1137782/www/china1.by/classwithtostring.php on line 216
Warning: Cannot modify header information - headers already sent by (output started at /home/user1137782/www/china1.by/classwithtostring.php:6) in /home/user1137782/www/china1.by/classwithtostring.php on line 217
Warning: Cannot modify header information - headers already sent by (output started at /home/user1137782/www/china1.by/classwithtostring.php:6) in /home/user1137782/www/china1.by/classwithtostring.php on line 218
Berkeley DB: DbEnv::set_app_dispatch
|
DbEnv::set_app_dispatch
|
 |
#include <db_cxx.h>
int
DbEnv::set_app_dispatch(int (*tx_recover)(DbEnv *dbenv,
Dbt *log_rec, DbLsn *lsn, db_recops op));
Description: DbEnv::set_app_dispatch
Declare a function to be called during transaction abort and recovery
to process application-specific log records.
The DbEnv::set_app_dispatch method configures operations performed using the specified
DbEnv handle, not all operations performed on the underlying
database environment.
The DbEnv::set_app_dispatch method may not be called after the DbEnv::open method is
called.
If the database environment already exists when
DbEnv::open is called, the information specified to DbEnv::set_app_dispatch
must be consistent with the existing environment or corruption can
occur.
The DbEnv::set_app_dispatch method
either returns a non-zero error value
or throws an exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
Parameters
tx_recover- The tx_recover parameter is the application's abort and recovery
function. The function takes four parameters:
dbenv- The dbenv parameter is the enclosing database environment handle.
log_rec- The log_rec parameter is a log record.
lsn- The lsn parameter is a log sequence number.
op- The op parameter is one of the following values:
DB_TXN_BACKWARD_ROLL- The log is being read backward to determine which transactions have been
committed and to abort those operations that were not; undo the operation
described by the log record.
DB_TXN_FORWARD_ROLL- The log is being played forward; redo the operation described by the log
record.
DB_TXN_ABORT- The log is being read backward during a transaction abort; undo the
operation described by the log record.
DB_TXN_APPLY- The log is being applied on a replica site; redo the operation
described by the log record.
DB_TXN_PRINT- The log is being printed for debugging purposes; print the contents of
this log record in the desired format.
The DB_TXN_FORWARD_ROLL and DB_TXN_APPLY operations
frequently imply the same actions, redoing changes that appear in the
log record, although if a recovery function is to be used on a
replication client where reads may be taking place concurrently with the
processing of incoming messages, DB_TXN_APPLY operations should
also perform appropriate locking. The macro DB_REDO(op) checks that the
operation is one of DB_TXN_FORWARD_ROLL or DB_TXN_APPLY,
and should be used in the recovery code to refer to the conditions under
which operations should be redone. Similarly, the macro DB_UNDO(op)
checks if the operation is one of DB_TXN_BACKWARD_ROLL or
DB_TXN_ABORT.
The function must return 0 on success and either errno or a
value outside of the Berkeley DB error name space on failure.
Errors
The DbEnv::set_app_dispatch method
may fail and throw
DbException,
encapsulating one of the following non-zero errors, or return one of
the following non-zero errors:
EINVAL- If the method was called after DbEnv::open was called; or if an
invalid flag value or parameter was specified.
Class
DbEnv, DbTxn
See Also
Transaction Subsystem and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.