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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def namedb_preorder_insert( cur, preorder_rec ):
 """ Add a name or namespace preorder record, if it doesn't exist already. DO NOT CALL THIS DIRECTLY. """


    preorder_row = copy.deepcopy( preorder_rec )
    
    assert 'preorder_hash' in preorder_row, "BUG: missing preorder_hash"

    try:
        preorder_query, preorder_values = namedb_insert_prepare( cur, preorder_row, "preorders" )
    except Exception, e:
        log.exception(e)
        log.error("FATAL: Failed to insert name preorder '%s'" % preorder_row['preorder_hash']) 
        os.abort()

    namedb_query_execute( cur, preorder_query, preorder_values )
    return True