root / snf-pithos-backend / pithos / backends / lib / sqlalchemy / xfeatures.py @ 5f8bbf54
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1 | 2e662088 | Antony Chazapis | # Copyright 2011-2012 GRNET S.A. All rights reserved.
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2 | 4f917833 | 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 | 4f917833 | 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 | 4f917833 | 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 | 4f917833 | 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 | 4f917833 | 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 | 4f917833 | Sofia Papagiannaki | from collections import defaultdict |
35 | 4f917833 | Sofia Papagiannaki | from sqlalchemy import Table, Column, String, Integer, MetaData, ForeignKey |
36 | 4f917833 | Sofia Papagiannaki | from sqlalchemy.sql import select, and_ |
37 | 4f917833 | Sofia Papagiannaki | from sqlalchemy.schema import Index |
38 | 4f917833 | Sofia Papagiannaki | from sqlalchemy.sql.expression import desc |
39 | 4f917833 | Sofia Papagiannaki | |
40 | 4f917833 | Sofia Papagiannaki | from dbworker import DBWorker |
41 | 4f917833 | Sofia Papagiannaki | |
42 | 4f917833 | Sofia Papagiannaki | |
43 | 4f917833 | Sofia Papagiannaki | class XFeatures(DBWorker): |
44 | 4f917833 | Sofia Papagiannaki | """XFeatures are path properties that allow non-nested
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45 | 4f917833 | Sofia Papagiannaki | inheritance patterns. Currently used for storing permissions.
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46 | 4f917833 | Sofia Papagiannaki | """
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47 | 4f917833 | Sofia Papagiannaki | |
48 | 4f917833 | Sofia Papagiannaki | def __init__(self, **params): |
49 | 4f917833 | Sofia Papagiannaki | DBWorker.__init__(self, **params)
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50 | 4f917833 | Sofia Papagiannaki | metadata = MetaData() |
51 | 4f917833 | Sofia Papagiannaki | columns=[] |
52 | 4f917833 | Sofia Papagiannaki | columns.append(Column('feature_id', Integer, primary_key=True)) |
53 | 4f917833 | Sofia Papagiannaki | columns.append(Column('path', String(2048))) |
54 | 8af4c26d | Antony Chazapis | self.xfeatures = Table('xfeatures', metadata, *columns, mysql_engine='InnoDB') |
55 | 4f917833 | Sofia Papagiannaki | # place an index on path
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56 | 9e9615fe | Sofia Papagiannaki | Index('idx_features_path', self.xfeatures.c.path, unique=True) |
57 | 4f917833 | Sofia Papagiannaki | |
58 | 4f917833 | Sofia Papagiannaki | columns=[] |
59 | 4f917833 | Sofia Papagiannaki | columns.append(Column('feature_id', Integer,
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60 | 4f917833 | Sofia Papagiannaki | ForeignKey('xfeatures.feature_id',
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61 | 4f917833 | Sofia Papagiannaki | ondelete='CASCADE'),
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62 | 4f917833 | Sofia Papagiannaki | primary_key=True))
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63 | d3be972a | Sofia Papagiannaki | columns.append(Column('key', Integer, primary_key=True, |
64 | d3be972a | Sofia Papagiannaki | autoincrement=False))
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65 | 62bf8157 | Antony Chazapis | columns.append(Column('value', String(256), primary_key=True)) |
66 | 8af4c26d | Antony Chazapis | self.xfeaturevals = Table('xfeaturevals', metadata, *columns, mysql_engine='InnoDB') |
67 | 4f917833 | Sofia Papagiannaki | |
68 | 4f917833 | Sofia Papagiannaki | metadata.create_all(self.engine)
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69 | 4f917833 | Sofia Papagiannaki | |
70 | d83c93c9 | Antony Chazapis | # def xfeature_inherit(self, path):
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71 | d83c93c9 | Antony Chazapis | # """Return the (path, feature) inherited by the path, or None."""
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72 | d83c93c9 | Antony Chazapis | #
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73 | d83c93c9 | Antony Chazapis | # s = select([self.xfeatures.c.path, self.xfeatures.c.feature_id])
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74 | d83c93c9 | Antony Chazapis | # s = s.where(self.xfeatures.c.path <= path)
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75 | d83c93c9 | Antony Chazapis | # #s = s.where(self.xfeatures.c.path.like(self.escape_like(path) + '%', escape='\\')) # XXX: Implement reverse and escape like...
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76 | d83c93c9 | Antony Chazapis | # s = s.order_by(desc(self.xfeatures.c.path))
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77 | d83c93c9 | Antony Chazapis | # r = self.conn.execute(s)
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78 | d83c93c9 | Antony Chazapis | # l = r.fetchall()
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79 | d83c93c9 | Antony Chazapis | # r.close()
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80 | d83c93c9 | Antony Chazapis | # return l
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81 | 4f917833 | Sofia Papagiannaki | |
82 | cf341da4 | Antony Chazapis | def xfeature_get(self, path): |
83 | cf341da4 | Antony Chazapis | """Return feature for path."""
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84 | 4f917833 | Sofia Papagiannaki | |
85 | cf341da4 | Antony Chazapis | s = select([self.xfeatures.c.feature_id])
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86 | cf341da4 | Antony Chazapis | s = s.where(self.xfeatures.c.path == path)
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87 | 4f917833 | Sofia Papagiannaki | s = s.order_by(self.xfeatures.c.path)
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88 | 4f917833 | Sofia Papagiannaki | r = self.conn.execute(s)
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89 | cf341da4 | Antony Chazapis | row = r.fetchone() |
90 | 4f917833 | Sofia Papagiannaki | r.close() |
91 | cf341da4 | Antony Chazapis | if row:
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92 | cf341da4 | Antony Chazapis | return row[0] |
93 | cf341da4 | Antony Chazapis | return None |
94 | 4f917833 | Sofia Papagiannaki | |
95 | 4f917833 | Sofia Papagiannaki | def xfeature_create(self, path): |
96 | 4f917833 | Sofia Papagiannaki | """Create and return a feature for path.
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97 | 4f917833 | Sofia Papagiannaki | If the path has a feature, return it.
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98 | 4f917833 | Sofia Papagiannaki | """
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99 | 4f917833 | Sofia Papagiannaki | |
100 | cf341da4 | Antony Chazapis | feature = self.xfeature_get(path)
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101 | cf341da4 | Antony Chazapis | if feature is not None: |
102 | cf341da4 | Antony Chazapis | return feature
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103 | 4f917833 | Sofia Papagiannaki | s = self.xfeatures.insert()
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104 | 4f917833 | Sofia Papagiannaki | r = self.conn.execute(s, path=path)
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105 | 4f917833 | Sofia Papagiannaki | inserted_primary_key = r.inserted_primary_key[0]
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106 | 4f917833 | Sofia Papagiannaki | r.close() |
107 | 4f917833 | Sofia Papagiannaki | return inserted_primary_key
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108 | 4f917833 | Sofia Papagiannaki | |
109 | 4f917833 | Sofia Papagiannaki | def xfeature_destroy(self, path): |
110 | 4f917833 | Sofia Papagiannaki | """Destroy a feature and all its key, value pairs."""
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111 | 4f917833 | Sofia Papagiannaki | |
112 | 4f917833 | Sofia Papagiannaki | s = self.xfeatures.delete().where(self.xfeatures.c.path == path) |
113 | 4f917833 | Sofia Papagiannaki | r = self.conn.execute(s)
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114 | 4f917833 | Sofia Papagiannaki | r.close() |
115 | 4f917833 | Sofia Papagiannaki | |
116 | 8221c89d | Sofia Papagiannaki | def xfeature_destroy_bulk(self, paths): |
117 | 8221c89d | Sofia Papagiannaki | """Destroy features and all their key, value pairs."""
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118 | 8221c89d | Sofia Papagiannaki | |
119 | 8221c89d | Sofia Papagiannaki | s = self.xfeatures.delete().where(self.xfeatures.c.path.in_(paths)) |
120 | 8221c89d | Sofia Papagiannaki | r = self.conn.execute(s)
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121 | 8221c89d | Sofia Papagiannaki | r.close() |
122 | 8221c89d | Sofia Papagiannaki | |
123 | 4f917833 | Sofia Papagiannaki | def feature_dict(self, feature): |
124 | 4f917833 | Sofia Papagiannaki | """Return a dict mapping keys to list of values for feature."""
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125 | 4f917833 | Sofia Papagiannaki | |
126 | 4f917833 | Sofia Papagiannaki | s = select([self.xfeaturevals.c.key, self.xfeaturevals.c.value]) |
127 | 4f917833 | Sofia Papagiannaki | s = s.where(self.xfeaturevals.c.feature_id == feature)
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128 | 4f917833 | Sofia Papagiannaki | r = self.conn.execute(s)
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129 | 4f917833 | Sofia Papagiannaki | d = defaultdict(list)
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130 | 4f917833 | Sofia Papagiannaki | for key, value in r.fetchall(): |
131 | 4f917833 | Sofia Papagiannaki | d[key].append(value) |
132 | 4f917833 | Sofia Papagiannaki | r.close() |
133 | 4f917833 | Sofia Papagiannaki | return d
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134 | 4f917833 | Sofia Papagiannaki | |
135 | 4f917833 | Sofia Papagiannaki | def feature_set(self, feature, key, value): |
136 | 4f917833 | Sofia Papagiannaki | """Associate a key, value pair with a feature."""
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137 | 4f917833 | Sofia Papagiannaki | |
138 | 2ce96391 | Sofia Papagiannaki | s = self.xfeaturevals.select()
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139 | 2ce96391 | Sofia Papagiannaki | s = s.where(self.xfeaturevals.c.feature_id == feature)
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140 | 2ce96391 | Sofia Papagiannaki | s = s.where(self.xfeaturevals.c.key == key)
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141 | a68d51a4 | Sofia Papagiannaki | s = s.where(self.xfeaturevals.c.value == value)
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142 | 2ce96391 | Sofia Papagiannaki | r = self.conn.execute(s)
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143 | 2ce96391 | Sofia Papagiannaki | xfeaturevals = r.fetchall() |
144 | 4f917833 | Sofia Papagiannaki | r.close() |
145 | 2ce96391 | Sofia Papagiannaki | if len(xfeaturevals) == 0: |
146 | 2ce96391 | Sofia Papagiannaki | s = self.xfeaturevals.insert()
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147 | 2ce96391 | Sofia Papagiannaki | r = self.conn.execute(s, feature_id=feature, key=key, value=value)
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148 | 2ce96391 | Sofia Papagiannaki | r.close() |
149 | 4f917833 | Sofia Papagiannaki | |
150 | 4f917833 | Sofia Papagiannaki | def feature_setmany(self, feature, key, values): |
151 | 4f917833 | Sofia Papagiannaki | """Associate the given key, and values with a feature."""
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152 | 4f917833 | Sofia Papagiannaki | |
153 | 2ce96391 | Sofia Papagiannaki | #TODO: more efficient way to do it
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154 | 2ce96391 | Sofia Papagiannaki | for v in values: |
155 | 2ce96391 | Sofia Papagiannaki | self.feature_set(feature, key, v)
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156 | 4f917833 | Sofia Papagiannaki | |
157 | 4f917833 | Sofia Papagiannaki | def feature_unset(self, feature, key, value): |
158 | 4f917833 | Sofia Papagiannaki | """Disassociate a key, value pair from a feature."""
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159 | 4f917833 | Sofia Papagiannaki | |
160 | 4f917833 | Sofia Papagiannaki | s = self.xfeaturevals.delete()
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161 | 4f917833 | Sofia Papagiannaki | s = s.where(and_(self.xfeaturevals.c.feature_id == feature,
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162 | 4f917833 | Sofia Papagiannaki | self.xfeaturevals.c.key == key,
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163 | 4f917833 | Sofia Papagiannaki | self.xfeaturevals.c.value == value))
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164 | 4f917833 | Sofia Papagiannaki | r = self.conn.execute(s)
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165 | 4f917833 | Sofia Papagiannaki | r.close() |
166 | 4f917833 | Sofia Papagiannaki | |
167 | 4f917833 | Sofia Papagiannaki | def feature_unsetmany(self, feature, key, values): |
168 | 4f917833 | Sofia Papagiannaki | """Disassociate the key for the values given, from a feature."""
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169 | 4f917833 | Sofia Papagiannaki | |
170 | 4f917833 | Sofia Papagiannaki | for v in values: |
171 | 4f917833 | Sofia Papagiannaki | conditional = and_(self.xfeaturevals.c.feature_id == feature,
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172 | 4f917833 | Sofia Papagiannaki | self.xfeaturevals.c.key == key,
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173 | 4f917833 | Sofia Papagiannaki | self.xfeaturevals.c.value == v)
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174 | 4f917833 | Sofia Papagiannaki | s = self.xfeaturevals.delete().where(conditional)
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175 | 4f917833 | Sofia Papagiannaki | r = self.conn.execute(s)
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176 | 4f917833 | Sofia Papagiannaki | r.close() |
177 | 4f917833 | Sofia Papagiannaki | |
178 | 4f917833 | Sofia Papagiannaki | def feature_get(self, feature, key): |
179 | 4f917833 | Sofia Papagiannaki | """Return the list of values for a key of a feature."""
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180 | 4f917833 | Sofia Papagiannaki | |
181 | 4f917833 | Sofia Papagiannaki | s = select([self.xfeaturevals.c.value])
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182 | 4f917833 | Sofia Papagiannaki | s = s.where(and_(self.xfeaturevals.c.feature_id == feature,
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183 | 4f917833 | Sofia Papagiannaki | self.xfeaturevals.c.key == key))
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184 | 4f917833 | Sofia Papagiannaki | r = self.conn.execute(s)
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185 | 4f917833 | Sofia Papagiannaki | l = [row[0] for row in r.fetchall()] |
186 | 4f917833 | Sofia Papagiannaki | r.close() |
187 | 4f917833 | Sofia Papagiannaki | return l
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188 | 4f917833 | Sofia Papagiannaki | |
189 | 4f917833 | Sofia Papagiannaki | def feature_clear(self, feature, key): |
190 | 4f917833 | Sofia Papagiannaki | """Delete all key, value pairs for a key of a feature."""
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191 | 4f917833 | Sofia Papagiannaki | |
192 | 4f917833 | Sofia Papagiannaki | s = self.xfeaturevals.delete()
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193 | 4f917833 | Sofia Papagiannaki | s = s.where(and_(self.xfeaturevals.c.feature_id == feature,
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194 | 4f917833 | Sofia Papagiannaki | self.xfeaturevals.c.key == key))
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195 | 4f917833 | Sofia Papagiannaki | r = self.conn.execute(s)
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196 | 4f917833 | Sofia Papagiannaki | r.close() |