root / snf-pithos-backend / pithos / backends / lib / sqlalchemy / dbwrapper.py @ 87835e94
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1 | 2e662088 | Antony Chazapis | # Copyright 2011-2012 GRNET S.A. All rights reserved.
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2 | 2715ade4 | Sofia Papagiannaki | #
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3 | 4f917833 | Sofia Papagiannaki | # Redistribution and use in source and binary forms, with or
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4 | 4f917833 | Sofia Papagiannaki | # without modification, are permitted provided that the following
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5 | 4f917833 | Sofia Papagiannaki | # conditions are met:
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6 | 2715ade4 | Sofia Papagiannaki | #
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7 | 4f917833 | Sofia Papagiannaki | # 1. Redistributions of source code must retain the above
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8 | 4f917833 | Sofia Papagiannaki | # copyright notice, this list of conditions and the following
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9 | 4f917833 | Sofia Papagiannaki | # disclaimer.
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10 | 2715ade4 | Sofia Papagiannaki | #
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11 | 4f917833 | Sofia Papagiannaki | # 2. Redistributions in binary form must reproduce the above
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12 | 4f917833 | Sofia Papagiannaki | # copyright notice, this list of conditions and the following
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13 | 4f917833 | Sofia Papagiannaki | # disclaimer in the documentation and/or other materials
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14 | 4f917833 | Sofia Papagiannaki | # provided with the distribution.
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15 | 2715ade4 | Sofia Papagiannaki | #
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16 | 4f917833 | Sofia Papagiannaki | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | 4f917833 | Sofia Papagiannaki | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | 4f917833 | Sofia Papagiannaki | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | 4f917833 | Sofia Papagiannaki | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | 4f917833 | Sofia Papagiannaki | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | 4f917833 | Sofia Papagiannaki | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | 4f917833 | Sofia Papagiannaki | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | 4f917833 | Sofia Papagiannaki | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | 4f917833 | Sofia Papagiannaki | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | 4f917833 | Sofia Papagiannaki | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | 4f917833 | Sofia Papagiannaki | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | 4f917833 | Sofia Papagiannaki | # POSSIBILITY OF SUCH DAMAGE.
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28 | 2715ade4 | Sofia Papagiannaki | #
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29 | 4f917833 | Sofia Papagiannaki | # The views and conclusions contained in the software and
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30 | 4f917833 | Sofia Papagiannaki | # documentation are those of the authors and should not be
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31 | 4f917833 | Sofia Papagiannaki | # interpreted as representing official policies, either expressed
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32 | 4f917833 | Sofia Papagiannaki | # or implied, of GRNET S.A.
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33 | 4f917833 | Sofia Papagiannaki | |
34 | 308e0de6 | Sofia Papagiannaki | from sqlalchemy import create_engine |
35 | 308e0de6 | Sofia Papagiannaki | #from sqlalchemy.event import listen
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36 | 985b9b09 | Sofia Papagiannaki | from sqlalchemy.pool import NullPool |
37 | 308e0de6 | Sofia Papagiannaki | from sqlalchemy.interfaces import PoolListener |
38 | 4f917833 | Sofia Papagiannaki | |
39 | 059857e2 | Antony Chazapis | |
40 | 85a93d09 | Antony Chazapis | class DBWrapper(object): |
41 | 85a93d09 | Antony Chazapis | """Database connection wrapper."""
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42 | 2715ade4 | Sofia Papagiannaki | |
43 | 85a93d09 | Antony Chazapis | def __init__(self, db): |
44 | a179db1b | Sofia Papagiannaki | if db.startswith('sqlite://'): |
45 | 308e0de6 | Sofia Papagiannaki | class ForeignKeysListener(PoolListener): |
46 | 308e0de6 | Sofia Papagiannaki | def connect(self, dbapi_con, con_record): |
47 | 985b9b09 | Sofia Papagiannaki | dbapi_con.execute('pragma foreign_keys=ON;')
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48 | 985b9b09 | Sofia Papagiannaki | dbapi_con.execute('pragma case_sensitive_like=ON;')
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49 | 985b9b09 | Sofia Papagiannaki | self.engine = create_engine(
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50 | 985b9b09 | Sofia Papagiannaki | db, connect_args={'check_same_thread': False}, |
51 | 985b9b09 | Sofia Papagiannaki | poolclass=NullPool, listeners=[ForeignKeysListener()], |
52 | 985b9b09 | Sofia Papagiannaki | isolation_level='SERIALIZABLE')
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53 | 413448f1 | Sofia Papagiannaki | #elif db.startswith('mysql://'):
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54 | 413448f1 | Sofia Papagiannaki | # db = '%s?charset=utf8&use_unicode=0' %db
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55 | 413448f1 | Sofia Papagiannaki | # self.engine = create_engine(db, convert_unicode=True)
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56 | a179db1b | Sofia Papagiannaki | else:
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57 | 2715ade4 | Sofia Papagiannaki | #self.engine = create_engine(db, pool_size=0, max_overflow=-1)
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58 | 985b9b09 | Sofia Papagiannaki | self.engine = create_engine(
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59 | 29148653 | Sofia Papagiannaki | db, poolclass=NullPool, isolation_level='READ COMMITTED')
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60 | 7ed99da8 | root | self.engine.echo = False |
61 | 2715ade4 | Sofia Papagiannaki | self.engine.echo_pool = False |
62 | 43be9afd | Sofia Papagiannaki | self.conn = self.engine.connect() |
63 | 85a93d09 | Antony Chazapis | self.trans = None |
64 | 2715ade4 | Sofia Papagiannaki | |
65 | d14fe290 | Antony Chazapis | def close(self): |
66 | d14fe290 | Antony Chazapis | self.conn.close()
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67 | de8fb87d | Sofia Papagiannaki | self.conn = None |
68 | 2715ade4 | Sofia Papagiannaki | |
69 | 85a93d09 | Antony Chazapis | def execute(self): |
70 | 43be9afd | Sofia Papagiannaki | self.trans = self.conn.begin() |
71 | 2715ade4 | Sofia Papagiannaki | |
72 | 85a93d09 | Antony Chazapis | def commit(self): |
73 | 85a93d09 | Antony Chazapis | self.trans.commit()
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74 | 85a93d09 | Antony Chazapis | self.trans = None |
75 | 2715ade4 | Sofia Papagiannaki | |
76 | 85a93d09 | Antony Chazapis | def rollback(self): |
77 | 85a93d09 | Antony Chazapis | self.trans.rollback()
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78 | 85a93d09 | Antony Chazapis | self.trans = None |