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Revision 3706

sql_gen.py: Added to_text() and helper value null_as_str

View differences:

sql_gen.py
961 961
    def __init__(self, *args):
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        FunctionCall.__init__(self, InternalFunction('NULLIF'), *args)
963 963

  
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null_as_str = Cast('text', 'NULL')
965

  
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def to_text(value): return Coalesce(Cast('text', value), null_as_str)
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964 968
# See <http://www.postgresql.org/docs/8.3/static/datatype-numeric.html>
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null_sentinels = {
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    'character varying': r'\N',

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