batchupdate.py
author Radek Brich <radek.brich@devl.cz>
Tue, 24 Sep 2013 13:34:15 +0200
changeset 87 3ef717ee9253
parent 83 515fadd3d286
child 93 b72591087495
permissions -rwxr-xr-x
PgDiff: Add support for indexes.
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#!/usr/bin/env python3.2
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import time
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from pgtoolkit import toolbase
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from pgtoolkit.pgmanager import OperationalError
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class BatchUpdateTool(toolbase.SimpleTool):
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    def __init__(self):
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        toolbase.SimpleTool.__init__(self, name='batchupdate', desc='Run an UPDATE query until it does not update any rows.')
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        self.parser.add_argument('--query', dest='query', type=str, help='Query to run. It should be constructed using subquery with LIMIT.')
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        self.parser.add_argument('--sleep', dest='sleep', default=0, type=int, help='Sleep SLEEP seconds between subsequent queries.')
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        self.init()
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    def main(self):
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        # connect DB
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        rowcount = 1
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        while rowcount > 0:
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            print('query:', self.args.query)
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            with self.pgm.cursor('target') as curs:
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                try:
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                    curs.execute(self.args.query, [])
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                    rowcount = curs.rowcount
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                    print('updated', rowcount)
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                    curs.connection.commit()
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                except (OperationalError, SystemError) as e:
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                    print('Error:', str(e))
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            print('sleep %s seconds' % self.args.sleep)
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            time.sleep(self.args.sleep)
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tool = BatchUpdateTool()
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tool.main()
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