@Override
    public long length()  {
        assertNotFreed();
        return len;
    }
A standard implementation of the Blob interface.
<p>
By having an implementation, we do not have to
require usage of the java.sql.rowset module.

@author Per Minborg
@since 3.2.0
runtime-parent/runtime-typemapper/src/main/java/com/speedment/runtime/typemapper/largeobject/StandardBlob.java