public abstract void close () throws SQLException

Implementing: java.lang.AutoCloseable

Releases this Statement object's database and JDBC resources immediately instead of waiting for this to happen when it is automatically closed. It is generally good practice to release resources as soon as you are finished with them to avoid tying up database resources.

Calling the method close on a Statement object that is already closed has no effect.

Note:When a Statement object is closed, its current ResultSet object, if one exists, is also closed.

Exceptions:
SQLException    if a database access error occurs