annotate roundup/backends/indexer_rdbms.py @ 5932:df279b4e34a5

Run travis on 3.8 now that it's released.
author John Rouillard <rouilj@ieee.org>
date Sat, 19 Oct 2019 07:45:36 -0400
parents 56c9bcdea47f
children 8bda74ee7070
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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 roundup.backends.indexer_common import Indexer as IndexerBase
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8 from roundup.anypy.strings import us2u, u2s
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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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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 = tuple(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 = us2u(text, "replace")
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66 text = text.upper()
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67 wordlist = [u2s(w)
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68 for w in re.findall(r'(?u)\b\w{%d,%d}\b'
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69 % (self.minlength, self.maxlength), text)]
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70 words = set()
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71 for word in wordlist:
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72 if self.is_stopword(word): continue
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73 words.add(word)
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74
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75 # for each word, add an entry in the db
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76 sql = 'insert into __words (_word, _textid) values (%s, %s)'%(a, a)
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77 words = [(word, id) for word in words]
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78 self.db.cursor.executemany(sql, words)
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79
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80 def find(self, wordlist):
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81 """look up all the words in the wordlist.
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82 If none are found return an empty dictionary
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83 * more rules here
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84 """
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85 if not wordlist:
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86 return []
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87
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88 l = [word.upper() for word in wordlist
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89 if self.minlength <= len(word) <= self.maxlength]
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90 l = [word for word in l if not self.is_stopword(word)]
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91
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92 if not l:
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93 return []
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94
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95 if self.db.implements_intersect:
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96 # simple AND search
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97 sql = 'select distinct(_textid) from __words where _word=%s'%self.db.arg
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98 sql = '\nINTERSECT\n'.join([sql]*len(l))
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99 self.db.cursor.execute(sql, tuple(l))
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100 r = self.db.cursor.fetchall()
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101 if not r:
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102 return []
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103 a = ','.join([self.db.arg] * len(r))
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104 sql = 'select _class, _itemid, _prop from __textids '\
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105 'where _textid in (%s)'%a
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106 self.db.cursor.execute(sql, tuple([int(row[0]) for row in r]))
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107
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108 else:
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109 # A more complex version for MySQL since it doesn't implement INTERSECT
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110
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111 # Construct SQL statement to join __words table to itself
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112 # multiple times.
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113 sql = """select distinct(__words1._textid)
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114 from __words as __words1 %s
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115 where __words1._word=%s %s"""
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116
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117 join_tmpl = ' left join __words as __words%d using (_textid) \n'
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118 match_tmpl = ' and __words%d._word=%s \n'
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119
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120 join_list = []
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121 match_list = []
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122 for n in range(len(l) - 1):
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123 join_list.append(join_tmpl % (n + 2))
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124 match_list.append(match_tmpl % (n + 2, self.db.arg))
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125
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126 sql = sql%(' '.join(join_list), self.db.arg, ' '.join(match_list))
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127 self.db.cursor.execute(sql, l)
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128
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129 r = [x[0] for x in self.db.cursor.fetchall()]
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parents: 3033
diff changeset
130 if not r:
4008
0bf9f8ae7d1b fix bug introduced in 1.4.5 in RDBMS full-text indexing;
Richard Jones <richard@users.sourceforge.net>
parents: 3988
diff changeset
131 return []
3048
d9b4224f955c merge from maint-0-8
Richard Jones <richard@users.sourceforge.net>
parents: 3033
diff changeset
132
d9b4224f955c merge from maint-0-8
Richard Jones <richard@users.sourceforge.net>
parents: 3033
diff changeset
133 a = ','.join([self.db.arg] * len(r))
d9b4224f955c merge from maint-0-8
Richard Jones <richard@users.sourceforge.net>
parents: 3033
diff changeset
134 sql = 'select _class, _itemid, _prop from __textids '\
d9b4224f955c merge from maint-0-8
Richard Jones <richard@users.sourceforge.net>
parents: 3033
diff changeset
135 'where _textid in (%s)'%a
d9b4224f955c merge from maint-0-8
Richard Jones <richard@users.sourceforge.net>
parents: 3033
diff changeset
136
d9b4224f955c merge from maint-0-8
Richard Jones <richard@users.sourceforge.net>
parents: 3033
diff changeset
137 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
138
3076
2817a4db901d Change indexer_common.search() to take a list of nodeids...
Johannes Gijsbers <jlgijsbers@users.sourceforge.net>
parents: 3048
diff changeset
139 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
140

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