How to properly turn off reminder error environment?

Hello

I experimented with the DbEnv::set_errcall() function in 6.1.19 output and found a strange behavior. The documentation says that this detailed error message is written in stderr if error callback is not defined for the environment. It's true. When a reminder of error, detailed error message is passed to the appropriate function. It's true. But when I UN-configure callback (call 'set_errcal (nullptr)') error messages detailed interface are not written to the srderr again.

(1) here, we try to delete a record with a wrong number producing error messages to stderr

size_t flags = DB_CREATE / * create the environment if there is no * /.

| DB_INIT_LOCK / * initialization of the locking subsystem * /.

| DB_INIT_LOG / * initialize the recording subsystem * /.

| DB_INIT_TXN / * initialization of the transaction subsystem. This also enables logging. */

| DB_INIT_MPOOL;      / * Initialization of the pool memory (cached) * /.

DbEnv env (DB_CXX_NO_EXCEPTIONS);

approx. Open ("d:\\test", flags, 0);

DB db (& env, DB_CXX_NO_EXCEPTIONS);

DB.set_flags (DB_RENUMBER);

DB. Open (nullptr, "test.bdb", nullptr, DB_AUTO_COMMIT, DB_RECNO | ") DB_CREATE | DB_READ_UNCOMMITTED, 0);

db_recno_t recno = 0;

DBT k (& recno, sizeof (db_recno_t));

k.set_ulen (k.get_size ());

k.set_flags (DB_DBT_USERMEM);

DB.del (nullptr, & k, 0);

DB.del (nullptr, & k, 0);

DB.del (nullptr, & k, 0);


Output:

0 illegal registration number BDB1002

0 illegal registration number BDB1002

0 illegal registration number BDB1002

(2) here do us the same thing to the exodus 1 but adding an empty string of sense

size_t flags = DB_CREATE / * create the environment if there is no * /.

| DB_INIT_LOCK / * initialization of the locking subsystem * /.

| DB_INIT_LOG / * initialize the recording subsystem * /.

| DB_INIT_TXN / * initialization of the transaction subsystem. This also enables logging. */

| DB_INIT_MPOOL;      / * Initialization of the pool memory (cached) * /.

DbEnv env (DB_CXX_NO_EXCEPTIONS);

env.set_errcall (nullptr); <-makes NO sense IN THIS CONTEXT

approx. Open ("d:\\test", flags, 0);

DB db (& env, DB_CXX_NO_EXCEPTIONS);

DB.set_flags (DB_RENUMBER);

DB. Open (nullptr, "test.bdb", nullptr, DB_AUTO_COMMIT, DB_RECNO | ") DB_CREATE | DB_READ_UNCOMMITTED, 0);

db_recno_t recno = 0;

DBT k (& recno, sizeof (db_recno_t));

k.set_ulen (k.get_size ());

k.set_flags (DB_DBT_USERMEM);

DB.del (nullptr, & k, 0);

DB.del (nullptr, & k, 0);

DB.del (nullptr, & k, 0);

Output: < no output >

I expect 3 error message or writes to stderr in ex.2. What is the problem with the example? Definition of recall error null someway affect writes to stderr.

Thank you.

Hello

The definition of recall clears the flag which control writes to stderr, and this occurs even when you set a reminder of the NULL value. Take us a look at this topic and try to fix it.

Currently, if you want to write to 'stderr' once again, you can call the DB_ENV-> set_errfile, and provide "stderr" as an argument.

Kind regards

Winter, Oracle Berkeley DB

Tags: Database

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