Mercurial > p > roundup > code

annotate roundup/backends/indexer_rdbms.py @ 3992:fe2af84a5ca5

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allow binary data for "content" props through rawToHyperdb
author Richard Jones <richard@users.sourceforge.net>
date Mon, 18 Aug 2008 06:21:53 +0000
parents b50446ff16f4
children 0bf9f8ae7d1b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #$Id: indexer_rdbms.py,v 1.17 2008-08-07 22:02:30 richard Exp $
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2 ''' This implements the full-text indexer over two RDBMS tables. The first
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3 is a mapping of words to occurance IDs. The second maps the IDs to (Class,
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4 propname, itemid) instances.
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5 '''
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6 import re, sets
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7
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8 from roundup.backends.indexer_common import Indexer as IndexerBase
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9
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10 class Indexer(IndexerBase):
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11 def __init__(self, db):
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12 IndexerBase.__init__(self, db)
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13 self.db = db
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14 self.reindex = 0
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15
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16 def close(self):
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17 '''close the indexing database'''
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18 # just nuke the circular reference
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19 self.db = None
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20
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21 def save_index(self):
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22 '''Save the changes to the index.'''
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23 # not necessary - the RDBMS connection will handle this for us
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24 pass
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25
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26 def force_reindex(self):
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27 '''Force a reindexing of the database. This essentially
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28 empties the tables ids and index and sets a flag so
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29 that the databases are reindexed'''
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30 self.reindex = 1
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31
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32 def should_reindex(self):
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33 '''returns True if the indexes need to be rebuilt'''
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34 return self.reindex
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35
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36 def add_text(self, identifier, text, mime_type='text/plain'):
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37 ''' "identifier" is (classname, itemid, property) '''
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38 if mime_type != 'text/plain':
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39 return
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40
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41 # Ensure all elements of the identifier are strings 'cos the itemid
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42 # column is varchar even if item ids may be numbers elsewhere in the
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43 # code. ugh.
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44 identifier = map(str, identifier)
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45
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46 # first, find the id of the (classname, itemid, property)
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47 a = self.db.arg
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48 sql = 'select _textid from __textids where _class=%s and '\
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49 '_itemid=%s and _prop=%s'%(a, a, a)
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50 self.db.cursor.execute(sql, identifier)
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51 r = self.db.cursor.fetchone()
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52 if not r:
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53 # not previously indexed
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54 id = self.db.newid('__textids')
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55 sql = 'insert into __textids (_textid, _class, _itemid, _prop)'\
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56 ' values (%s, %s, %s, %s)'%(a, a, a, a)
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57 self.db.cursor.execute(sql, (id, ) + identifier)
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58 else:
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59 id = int(r[0])
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60 # clear out any existing indexed values
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61 sql = 'delete from __words where _textid=%s'%a
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62 self.db.cursor.execute(sql, (id, ))
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63
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64 # ok, find all the unique words in the text
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65 text = unicode(text, "utf-8", "replace").upper()
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66 wordlist = [w.encode("utf-8", "replace")
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67 for w in re.findall(r'(?u)\b\w{2,25}\b', text)]
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68 words = sets.Set()
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69 for word in wordlist:
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70 if self.is_stopword(word): continue
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71 if len(word) > 25: continue
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72 words.add(word)
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73
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74 # for each word, add an entry in the db
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75 sql = 'insert into __words (_word, _textid) values (%s, %s)'%(a, a)
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76 words = [(word, id) for word in words]
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77 self.db.cursor.executemany(sql, words)
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78
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79 def find(self, wordlist):
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80 '''look up all the words in the wordlist.
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81 If none are found return an empty dictionary
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82 * more rules here
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83 '''
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84 if not wordlist:
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85 return {}
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86
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87 l = [word.upper() for word in wordlist if 26 > len(word) > 2]
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88
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89 if not l:
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90 return {}
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91
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92 if self.db.implements_intersect:
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93 # simple AND search
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94 sql = 'select distinct(_textid) from __words where _word=%s'%self.db.arg
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95 sql = '\nINTERSECT\n'.join([sql]*len(l))
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96 self.db.cursor.execute(sql, tuple(l))
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97 r = self.db.cursor.fetchall()
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98 if not r:
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99 return {}
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100 a = ','.join([self.db.arg] * len(r))
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101 sql = 'select _class, _itemid, _prop from __textids '\
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102 'where _textid in (%s)'%a
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103 self.db.cursor.execute(sql, tuple([int(row[0]) for row in r]))
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104
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105 else:
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106 # A more complex version for MySQL since it doesn't implement INTERSECT
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107
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108 # Construct SQL statement to join __words table to itself
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109 # multiple times.
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110 sql = """select distinct(__words1._textid)
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111 from __words as __words1 %s
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112 where __words1._word=%s %s"""
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113
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114 join_tmpl = ' left join __words as __words%d using (_textid) \n'
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115 match_tmpl = ' and __words%d._word=%s \n'
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116
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117 join_list = []
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118 match_list = []
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119 for n in xrange(len(l) - 1):
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120 join_list.append(join_tmpl % (n + 2))
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121 match_list.append(match_tmpl % (n + 2, self.db.arg))
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122
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123 sql = sql%(' '.join(join_list), self.db.arg, ' '.join(match_list))
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124 self.db.cursor.execute(sql, l)
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125
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126 r = map(lambda x: x[0], self.db.cursor.fetchall())
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127 if not r:
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128 return {}
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129
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130 a = ','.join([self.db.arg] * len(r))
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131 sql = 'select _class, _itemid, _prop from __textids '\
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132 'where _textid in (%s)'%a
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diff changeset
133
d9b4224f955c merge from maint-0-8
Richard Jones <richard@users.sourceforge.net>
parents: 3033
diff changeset
134 self.db.cursor.execute(sql, tuple(map(int, r)))
d9b4224f955c merge from maint-0-8
Richard Jones <richard@users.sourceforge.net>
parents: 3033
diff changeset
135
3076
2817a4db901d Change indexer_common.search() to take a list of nodeids...
Johannes Gijsbers <jlgijsbers@users.sourceforge.net>
parents: 3048
diff changeset
136 return self.db.cursor.fetchall()
2093
3f6024ab2c7a That's the last of the RDBMS migration steps done! Yay!
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
137
Roundup Issue Tracker: http://roundup-tracker.org/