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annotate roundup/backends/indexer_rdbms.py @ 2623:4e1030d49cea

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fix: Option defaults were applied as strings... ...not converted to internal representation; add Option methods str2value and value2str for value conversion from and to the strings kept in .ini file; options MAIL_USERNAME, MAIL_TLS_KEYFILE and MAIL_TLS_CERTFILE default to empty strings: NODEFAULT value is a configuration error, and for these options it is ok to keep them unset.
author Alexander Smishlajev <a1s@users.sourceforge.net>
date Sun, 25 Jul 2004 14:36:50 +0000
parents 18addf2a8596
children d530b68e4b42
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2093
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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
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8
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9 class Indexer(Indexer):
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10 disallows = {'THE':1, 'THIS':1, 'ZZZ':1, 'THAT':1, 'WITH':1}
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11 def __init__(self, db):
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12 self.db = db
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13 self.reindex = 0
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14
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15 def close(self):
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16 '''close the indexing database'''
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17 # just nuke the circular reference
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18 self.db = None
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19
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20 def force_reindex(self):
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21 '''Force a reindexing of the database. This essentially
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22 empties the tables ids and index and sets a flag so
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23 that the databases are reindexed'''
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24 self.reindex = 1
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25
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26 def should_reindex(self):
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27 '''returns True if the indexes need to be rebuilt'''
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28 return self.reindex
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29
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30 def add_text(self, identifier, text, mime_type='text/plain'):
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31 ''' "identifier" is (classname, itemid, property) '''
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32 if mime_type != 'text/plain':
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33 return
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34
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35 # first, find the id of the (classname, itemid, property)
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36 a = self.db.arg
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37 sql = 'select _textid from __textids where _class=%s and '\
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38 '_itemid=%s and _prop=%s'%(a, a, a)
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39 self.db.cursor.execute(sql, identifier)
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40 r = self.db.cursor.fetchone()
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41 if not r:
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42 id = self.db.newid('__textids')
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43 sql = 'insert into __textids (_textid, _class, _itemid, _prop)'\
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44 ' values (%s, %s, %s, %s)'%(a, a, a, a)
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45 self.db.cursor.execute(sql, (id, ) + identifier)
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46 self.db.cursor.execute('select max(_textid) from __textids')
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47 id = self.db.cursor.fetchone()[0]
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48 else:
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49 id = int(r[0])
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50 # clear out any existing indexed values
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51 sql = 'delete from __words where _textid=%s'%a
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52 self.db.cursor.execute(sql, (id, ))
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53
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54 # ok, find all the words in the text
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55 wordlist = re.findall(r'\b\w{2,25}\b', str(text).upper())
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56 words = {}
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57 for word in wordlist:
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58 if not self.disallows.has_key(word):
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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 l = [word.upper() for word in wordlist if 26 > len(word) > 2]
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78
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79 a = ','.join([self.db.arg] * len(l))
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80 sql = 'select distinct(_textid) from __words where _word in (%s)'%a
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81 self.db.cursor.execute(sql, tuple(l))
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82 r = self.db.cursor.fetchall()
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83 if not r:
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84 return {}
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85 a = ','.join([self.db.arg] * len(r))
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86 sql = 'select _class, _itemid, _prop from __textids '\
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87 'where _textid in (%s)'%a
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88 self.db.cursor.execute(sql, tuple([int(id) for (id,) in r]))
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89 # self.search_index has the results as {some id: identifier} ...
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90 # sigh
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91 r = {}
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92 k = 0
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93 for c,n,p in self.db.cursor.fetchall():
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94 key = (str(c), str(n), str(p))
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95 r[k] = key
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96 k += 1
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97 return r
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98
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99 def save_index(self):
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100 # the normal RDBMS backend transaction mechanisms will handle this
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101 pass
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102
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103 def rollback(self):
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104 # the normal RDBMS backend transaction mechanisms will handle this
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105 pass
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106
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