sqla_regex.py 文件源码

def sqlite_regex_match(element, compiler, **kw):
    """Compile the SQL expression representing a regular expression match
    for the SQLite engine.
    """
    # determine the name of a custom SQLite function to use for the operator
    operator = element.operator.opstring
    try:
        func_name, _ = SQLITE_REGEX_FUNCTIONS[operator]
    except (KeyError, ValueError), e:
        would_be_sql_string = ' '.join((compiler.process(element.left),
                                        operator,
                                        compiler.process(element.right)))
        raise exc.StatementError(
            "unknown regular expression match operator: %s" % operator,
            would_be_sql_string, None, e)

    # compile the expression as an invocation of the custom function
    regex_func = getattr(func, func_name)
    regex_func_call = regex_func(element.left, element.right)
    return compiler.process(regex_func_call)