Please explain these Python Fetch types

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Please explain these Python Fetch types

Postby priyanka_hdp » Thu Mar 28, 2013 10:37 am

What is the difference between these fetching.?
please give me a examples for reference site to get clear idea.still i'm confuse with it
Code: Select all
    res = cr.dictfetchall()

    res2 = cr.dictfetchone()

    res3 = cr.fetchall()

    res4 = cr.fetchone()




cr used in openerp 7

Code: Select all
    def _max_reg_no(self, cr, uid, context=None):
        cr.execute("""
        select register_no as reg_no
        from bpl_worker
        where id in (select max(id) from bpl_worker)
        """)
        res = cr.fetchone()[0]
        return res
Last edited by priyanka_hdp on Thu Mar 28, 2013 10:47 am, edited 2 times in total.
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Re: Please explain these Python Fetch types

Postby micseydel » Thu Mar 28, 2013 10:40 am

What is cr?
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Re: Please explain these Python Fetch types

Postby setrofim » Thu Mar 28, 2013 11:07 am

It looks like cr is some kind of a query object from an ORM. If that is the case, then the difference is that fetchall() will return a list of all the results (even if there is one result, it will be returned as a list of length one). fetchone() will return the one result (not in a list); but will raise an exception if there isn't exactly one result. By default, the result will be either a list or a tuple of values. The dict- versions will return the result as a dict mapping column names to the values.

But yeah, as micseydel said, we'd need to know what cr is to be able to tell for sure.
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