Berkeley DB: DbTxn::discard
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++

### DbTxn::discard |

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###

    #include <db_cxx.h>

    int
    DbTxn::discard(u_int32_t flags);

### Description: DbTxn::discard

The DbTxn::discard method frees up all the per-process resources associated with the specified DbTxn handle, neither committing nor aborting the transaction. This call may be used only after calls to DbEnv::txn_recover when there are multiple global transaction managers recovering transactions in a single Berkeley DB environment. Any transactions returned by DbEnv::txn_recover that are not handled by the current global transaction manager should be discarded using DbTxn::discard.

The DbTxn::discard 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.

After DbTxn::discard has been called, regardless of its return, the DbTxn handle may not be accessed again.

### Parameters

flags
  The flags parameter is currently unused, and must be set to 0.

### Errors

The DbTxn::discard 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 transaction handle does not refer to a transaction that was recovered into a prepared but not yet completed state; or if an invalid flag value or parameter was specified.

### Class

DbEnv, DbTxn

### See Also

Transaction Subsystem and Related Methods`

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