root / snf-pithos-backend / pithos / backends / lib / sqlite / config.py @ 4a7b190f
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1 | 6540c590 | Sofia Papagiannaki | # Copyright 2011-2012 GRNET S.A. All rights reserved.
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2 | 6540c590 | Sofia Papagiannaki | #
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3 | 6540c590 | Sofia Papagiannaki | # Redistribution and use in source and binary forms, with or
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4 | 6540c590 | Sofia Papagiannaki | # without modification, are permitted provided that the following
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5 | 6540c590 | Sofia Papagiannaki | # conditions are met:
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6 | 6540c590 | Sofia Papagiannaki | #
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7 | 6540c590 | Sofia Papagiannaki | # 1. Redistributions of source code must retain the above
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8 | 6540c590 | Sofia Papagiannaki | # copyright notice, this list of conditions and the following
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9 | 6540c590 | Sofia Papagiannaki | # disclaimer.
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10 | 6540c590 | Sofia Papagiannaki | #
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11 | 6540c590 | Sofia Papagiannaki | # 2. Redistributions in binary form must reproduce the above
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12 | 6540c590 | Sofia Papagiannaki | # copyright notice, this list of conditions and the following
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13 | 6540c590 | Sofia Papagiannaki | # disclaimer in the documentation and/or other materials
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14 | 6540c590 | Sofia Papagiannaki | # provided with the distribution.
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15 | 6540c590 | Sofia Papagiannaki | #
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16 | 6540c590 | Sofia Papagiannaki | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | 6540c590 | Sofia Papagiannaki | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | 6540c590 | Sofia Papagiannaki | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | 6540c590 | Sofia Papagiannaki | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | 6540c590 | Sofia Papagiannaki | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | 6540c590 | Sofia Papagiannaki | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | 6540c590 | Sofia Papagiannaki | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | 6540c590 | Sofia Papagiannaki | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | 6540c590 | Sofia Papagiannaki | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | 6540c590 | Sofia Papagiannaki | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | 6540c590 | Sofia Papagiannaki | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | 6540c590 | Sofia Papagiannaki | # POSSIBILITY OF SUCH DAMAGE.
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28 | 6540c590 | Sofia Papagiannaki | #
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29 | 6540c590 | Sofia Papagiannaki | # The views and conclusions contained in the software and
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30 | 6540c590 | Sofia Papagiannaki | # documentation are those of the authors and should not be
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31 | 6540c590 | Sofia Papagiannaki | # interpreted as representing official policies, either expressed
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32 | 6540c590 | Sofia Papagiannaki | # or implied, of GRNET S.A.
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33 | 6540c590 | Sofia Papagiannaki | |
34 | 6540c590 | Sofia Papagiannaki | # from collections import defaultdict
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35 | 29148653 | Sofia Papagiannaki | #
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36 | 6540c590 | Sofia Papagiannaki | from dbworker import DBWorker |
37 | 6540c590 | Sofia Papagiannaki | |
38 | 6540c590 | Sofia Papagiannaki | |
39 | 6540c590 | Sofia Papagiannaki | class Config(DBWorker): |
40 | 6540c590 | Sofia Papagiannaki | """Config are properties holding persistent information about system state.
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41 | 6540c590 | Sofia Papagiannaki | """
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42 | 6540c590 | Sofia Papagiannaki | |
43 | 6540c590 | Sofia Papagiannaki | def __init__(self, **params): |
44 | 6540c590 | Sofia Papagiannaki | DBWorker.__init__(self, **params)
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45 | 6540c590 | Sofia Papagiannaki | execute = self.execute
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46 | 6540c590 | Sofia Papagiannaki | |
47 | 6540c590 | Sofia Papagiannaki | execute(""" create table if not exists config
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48 | 6540c590 | Sofia Papagiannaki | ( key text primary key,
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49 | 6540c590 | Sofia Papagiannaki | value text ) """)
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50 | 6540c590 | Sofia Papagiannaki | |
51 | 6540c590 | Sofia Papagiannaki | def get_value(self, key): |
52 | 6540c590 | Sofia Papagiannaki | """Return configuration value for key."""
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53 | 6540c590 | Sofia Papagiannaki | |
54 | 6540c590 | Sofia Papagiannaki | q = "select value from config where key = ?"
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55 | 6540c590 | Sofia Papagiannaki | self.execute(q, (key,))
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56 | 6540c590 | Sofia Papagiannaki | r = self.fetchone()
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57 | 6540c590 | Sofia Papagiannaki | if r is not None: |
58 | 6540c590 | Sofia Papagiannaki | return r[0] |
59 | 6540c590 | Sofia Papagiannaki | return None |
60 | 29148653 | Sofia Papagiannaki | |
61 | 6540c590 | Sofia Papagiannaki | def set_value(self, key, value): |
62 | 6540c590 | Sofia Papagiannaki | """Set configuration entry.
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63 | 6540c590 | Sofia Papagiannaki | """
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64 | 6540c590 | Sofia Papagiannaki | |
65 | e647d184 | Sofia Papagiannaki | q = "insert into config (key, value) values (?, ?)"
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66 | 6540c590 | Sofia Papagiannaki | id = self.execute(q, (key, value)).lastrowid
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67 | 29148653 | Sofia Papagiannaki | return id |