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annotate roundup/backends/indexer_rdbms.py @ 3238:6074d290bb4e maint-0.8

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*** empty log message ***
author Richard Jones <richard@users.sourceforge.net>
date Thu, 03 Mar 2005 22:16:19 +0000
parents a7045bad20de
children 2817a4db901d 3096c4b10960
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1 ''' This implements the full-text indexer over two RDBMS tables. The first
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2 is a mapping of words to occurance IDs. The second maps the IDs to (Class,
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3 propname, itemid) instances.
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4 '''
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5 import re
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6
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7 from indexer_dbm import Indexer, is_stopword
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8
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9 class Indexer(Indexer):
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10 def __init__(self, db):
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11 self.db = db
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12 self.reindex = 0
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13
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14 def close(self):
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15 '''close the indexing database'''
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16 # just nuke the circular reference
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17 self.db = None
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18
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19 def force_reindex(self):
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20 '''Force a reindexing of the database. This essentially
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21 empties the tables ids and index and sets a flag so
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22 that the databases are reindexed'''
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23 self.reindex = 1
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24
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25 def should_reindex(self):
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26 '''returns True if the indexes need to be rebuilt'''
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27 return self.reindex
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28
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29 def add_text(self, identifier, text, mime_type='text/plain'):
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30 ''' "identifier" is (classname, itemid, property) '''
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31 if mime_type != 'text/plain':
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32 return
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33
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34 # first, find the id of the (classname, itemid, property)
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35 a = self.db.arg
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36 sql = 'select _textid from __textids where _class=%s and '\
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37 '_itemid=%s and _prop=%s'%(a, a, a)
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38 self.db.cursor.execute(sql, identifier)
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39 r = self.db.cursor.fetchone()
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40 if not r:
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41 id = self.db.newid('__textids')
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42 sql = 'insert into __textids (_textid, _class, _itemid, _prop)'\
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43 ' values (%s, %s, %s, %s)'%(a, a, a, a)
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44 self.db.cursor.execute(sql, (id, ) + identifier)
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45 self.db.cursor.execute('select max(_textid) from __textids')
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46 id = self.db.cursor.fetchone()[0]
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47 else:
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48 id = int(r[0])
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49 # clear out any existing indexed values
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50 sql = 'delete from __words where _textid=%s'%a
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51 self.db.cursor.execute(sql, (id, ))
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52
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53 # ok, find all the words in the text
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54 wordlist = re.findall(r'\b\w{2,25}\b', str(text).upper())
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55 words = {}
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56 for word in wordlist:
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57 if is_stopword(word):
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58 continue
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59 words[word] = 1
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60 words = words.keys()
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61
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62 # for each word, add an entry in the db
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63 for word in words:
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64 # don't dupe
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65 sql = 'select * from __words where _word=%s and _textid=%s'%(a, a)
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66 self.db.cursor.execute(sql, (word, id))
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67 if self.db.cursor.fetchall():
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68 continue
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69 sql = 'insert into __words (_word, _textid) values (%s, %s)'%(a, a)
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70 self.db.cursor.execute(sql, (word, id))
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71
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72 def find(self, wordlist):
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73 '''look up all the words in the wordlist.
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74 If none are found return an empty dictionary
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75 * more rules here
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76 '''
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77 if not wordlist:
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78 return {}
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79
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80 l = [word.upper() for word in wordlist if 26 > len(word) > 2]
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81
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82 if not l:
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83 return {}
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84
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85 if self.db.implements_intersect:
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86 # simple AND search
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87 sql = 'select distinct(_textid) from __words where _word=%s'%self.db.arg
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88 sql = '\nINTERSECT\n'.join([sql]*len(l))
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89 self.db.cursor.execute(sql, tuple(l))
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90 r = self.db.cursor.fetchall()
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91 if not r:
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92 return {}
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93 a = ','.join([self.db.arg] * len(r))
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94 sql = 'select _class, _itemid, _prop from __textids '\
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95 'where _textid in (%s)'%a
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96 self.db.cursor.execute(sql, tuple([int(id) for (id,) in r]))
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97
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98 else:
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99 # A more complex version for MySQL since it doesn't implement INTERSECT
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100
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101 # Construct SQL statement to join __words table to itself
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102 # multiple times.
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103 sql = """select distinct(__words1._textid)
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104 from __words as __words1 %s
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105 where __words1._word=%s %s"""
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106
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107 join_tmpl = ' left join __words as __words%d using (_textid) \n'
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108 match_tmpl = ' and __words%d._word=%s \n'
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109
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110 join_list = []
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111 match_list = []
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112 for n in xrange(len(l) - 1):
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113 join_list.append(join_tmpl % (n + 2))
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114 match_list.append(match_tmpl % (n + 2, self.db.arg))
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115
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116 sql = sql%(' '.join(join_list), self.db.arg, ' '.join(match_list))
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117 self.db.cursor.execute(sql, l)
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118
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119 r = map(lambda x: x[0], self.db.cursor.fetchall())
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120 if not r:
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121 return {}
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122
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123 a = ','.join([self.db.arg] * len(r))
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124 sql = 'select _class, _itemid, _prop from __textids '\
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125 'where _textid in (%s)'%a
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126
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127 self.db.cursor.execute(sql, tuple(map(int, r)))
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128
2093
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129 # self.search_index has the results as {some id: identifier} ...
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130 # sigh
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131 r = {}
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132 k = 0
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133 for c,n,p in self.db.cursor.fetchall():
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134 key = (str(c), str(n), str(p))
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135 r[k] = key
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136 k += 1
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137 return r
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138
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139 def save_index(self):
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140 # the normal RDBMS backend transaction mechanisms will handle this
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141 pass
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142
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143 def rollback(self):
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144 # the normal RDBMS backend transaction mechanisms will handle this
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145 pass
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146
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