public int del(DbTxn txnid, Dbt key, int flags) throws DbException;
The Db.del method removes key/data pairs from the database. The key/data pair associated with the specified key is discarded from the database. In the presence of duplicate key values, all records associated with the designated key will be discarded.
When called on a database that has been made into a secondary index using the Db.associate method, the Db.del method deletes the key/data pair from the primary database and all secondary indices.
If the operation is to be transaction-protected, the txnid parameter is a transaction handle returned from DbEnv.txn_begin; otherwise, null.
The flags parameter is currently unused, and must be set to 0.
The Db.del method throws an exception that encapsulates a non-zero error value on failure, and Db.DB_NOTFOUND if the specified key did not exist in the file.
The Db.del method may fail and throw an exception encapsulating a non-zero error for the following conditions:
If the operation was selected to resolve a deadlock, the Db.del method will fail and throw a DbDeadlockException exception.
The Db.del method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the Db.del method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way.
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