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< p > Library Version 11.2.5.2< / p >
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< th colspan = "3" align = "center" > DB_TXN-> discard()< / th >
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The DB_TXN Handle
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< h2 class = "title" style = "clear: both" > < a id = "txndiscard" > < / a > DB_TXN-> discard()< / h2 >
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< pre class = "programlisting" > #include < db.h>
int
DB_TXN-> discard(DB_TXN *tid, u_int32_t flags); < / pre >
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The < code class = "methodname" > DB_TXN-> discard()< / code > method frees up all the per-process resources
associated with the specified < a class = "link" href = "txn.html" title = "Chapter > DB_TXN< / a > handle, neither
committing nor aborting the transaction. This call may be used only
after calls to < a class = "xref" href = "txnrecover.html" title = "DB_ENV->txn_recover()" > DB_ENV-> txn_recover()< / a > when
there are multiple global transaction managers recovering transactions
in a single Berkeley DB environment. Any transactions returned by
< a class = "xref" href = "txnrecover.html" title = "DB_ENV->txn_recover()" > DB_ENV-> txn_recover()< / a >
that are not handled by the current global transaction manager should
be discarded using < code class = "methodname" > DB_TXN-> discard()< / code > .
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All open cursors in the transaction are closed and the
first cursor close error, if any, is returned.
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The < code class = "methodname" > DB_TXN-> discard()< / code > < span >
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method returns a non-zero error value on failure and 0 on success.
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The errors values that this method returns include the error values of < code class = "methodname" > DBcursor-> close()< / code > and the following:
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< h4 class = "title" > < a id = "id3762386" > < / a > DB_LOCK_DEADLOCK< / h4 >
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A transactional database environment operation was selected to resolve
a deadlock.
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< h4 class = "title" > < a id = "id3762205" > < / a > DB_LOCK_NOTGRANTED< / h4 >
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A Berkeley DB Concurrent Data Store database environment configured
for lock timeouts was unable to grant a lock in the allowed time.
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< h4 class = "title" > < a id = "id3762121" > < / a > EINVAL< / h4 >
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If the cursor is already closed; or if an invalid flag value or parameter was specified.
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After < code class = "methodname" > DB_TXN-> discard()< / code > has been called, regardless of its return,
the < a class = "link" href = "txn.html" title = "Chapter > DB_TXN< / a > handle may not
be accessed again.
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< h3 class = "title" > < a id = "id3762537" > < / a > Parameters< / h3 >
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< h4 class = "title" > < a id = "id3762540" > < / a > flags< / h4 >
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The < span class = "bold" > < strong > flags< / strong > < / span > parameter is currently
unused, and must be set to 0.
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< h3 class = "title" > < a id = "id3762279" > < / a > Errors< / h3 >
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The < code class = "methodname" > DB_TXN-> discard()< / code > < span >
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method may fail and return one of the following non-zero errors:
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< h4 class = "title" > < a id = "id3762052" > < / a > EINVAL< / h4 >
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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.
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< a class = "link" href = "env.html" title = "Chapter > DB_ENV< / a > , < a class = "link" href = "txn.html" title = "Chapter > DB_TXN< / a >
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< h3 class = "title" > < a id = "id3762381" > < / a > See Also< / h3 >
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< a class = "xref" href = "txn.html#txnlist" title = "Transaction Subsystem and Related Methods" > Transaction Subsystem and Related Methods< / a >
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