Db::truncate(DbTxn *txnid, u_int32_t *countp, u_int32_t flags);
The Db::truncate interface empties the database, discarding all
records it contains.
The number of records discarded from the database is returned in
If the operation is to be transaction-protected (other than by specifying
the DB_AUTO_COMMIT flag), the txnid parameter is a
transaction handle returned from DbEnv::txn_begin; otherwise, NULL.
The flags value must be set to 0 or
the following value:
- Enclose the Db::truncate call within a transaction. If the call succeeds,
changes made by the operation will be recoverable. If the call fails,
the operation will have made no changes.
The Db::truncate 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.
The Db::truncate method may fail and throw an exception or return a non-zero error for the following conditions:
The Db::truncate method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the Db::truncate method may fail and
either return DB_RUNRECOVERY or throw a
in which case all subsequent Berkeley DB calls will fail in the same way.
Databases and Related Methods
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