Need to search with correct spelling typo snacks
HelloIf I am searching with a wrong spelling, it must ask (or) check with the correct spelling. Say, if the user performs a search for the keyword "serch", to look for the word "search".
This will make it possible to link the search words with the Thesaurus built instead of setting the spelling of all the words.
An example of the foregoing will be more useful.
Thanks in advance.
Oracle doesn't have a built-in spellchecker or similar spellings recovery method directly from the thesaurus. If you want a spell checker, then you must either get a dictionary that you can compare to or find a way to use a spellchecker online. If you get a dictionary, then you'll do something like creating a context on the dictionary and using fuzzy index to find possible spellings of correct based on a bad. If you use a spell checker online, he will do something similar. If using a spell checker in line and you wait until it is always available to your application, you should ensure that you have purchased a subscription to this service. In both cases, the final results are substantially the same as if you just do a fuzzy search in a first time and save a lot of trouble and further treatment, which can take some time. I have provided a few examples below for comparison. I first demonstrated using a dictionary. I walked just two rows, but you want to download a whole dictionary of somewhere, probably in text format, then use SQL * Loader to load it into a table. Then I have shown by using an online service, but not one who subscribes to that you can count on a method. Finally, I made a simple query using and blurred that renders the same as other methods, without all the extra code and treatment. So, I hope you can see that everything you need is probably a fuzzy search. In the examples I've provided, I used functions to concatenate all the suggested correct spellings with the | symbol, meaning the Oracle text and surrounded by each group in parentheses. You can use additional criteria to narrow the possibilities.
SCOTT@orcl_11gR2> -- test environment:
SCOTT@orcl_11gR2> create table test_tab
2 (test_col varchar2 (60))
3 /
Table created.
SCOTT@orcl_11gR2> insert all
2 into test_tab (test_col) values ('search for the rabbit')
3 into test_tab (test_col) values ('some other data')
4 select * from dual
5 /
2 rows created.
SCOTT@orcl_11gR2> create index test_idx
2 on test_tab (test_col)
3 indextype is ctxsys.context
4 /
Index created.
SCOTT@orcl_11gR2> -- method using dictionary you obtain:
SCOTT@orcl_11gR2> create table test_dict
2 (test_word varchar2(30))
3 /
Table created.
SCOTT@orcl_11gR2> insert all
2 into test_dict values ('rabbit')
3 into test_dict values ('search')
4 select * from dual
5 /
2 rows created.
SCOTT@orcl_11gR2> create index test_dict_idx
2 on test_dict (test_word)
3 indextype is ctxsys.context
4 /
Index created.
SCOTT@orcl_11gR2> create or replace function dict_check
2 (p_word in varchar2)
3 return varchar2
4 as
5 v_words varchar2 (2000);
6 begin
7 for r in
8 (select test_word
9 from test_dict
10 where contains (test_word, '?' || p_word) > 0
11 union
12 select p_word
13 from dual)
14 loop
15 v_words := v_words || '|' || r.test_word;
16 end loop;
17 return '(' || ltrim (v_words, '|') || ')';
18 end;
19 /
Function created.
SCOTT@orcl_11gR2> select dict_check ('serch') from dual
2 /
DICT_CHECK('SERCH')
--------------------------------------------------------------------------------
(search|serch)
1 row selected.
SCOTT@orcl_11gR2> select dict_check ('rabit') from dual
2 /
DICT_CHECK('RABIT')
--------------------------------------------------------------------------------
(rabbit|rabit)
1 row selected.
SCOTT@orcl_11gR2> select * from test_tab
2 where contains
3 (test_col,
4 dict_check ('serch')
5 || ' and ' ||
6 dict_check ('rabbit')) > 0
7 /
TEST_COL
------------------------------------------------------------
search for the rabbit
1 row selected.
SCOTT@orcl_11gR2> -- method using online spell checker:
SCOTT@orcl_11gR2> create or replace function spell_check
2 (p_word in varchar2)
3 return varchar2
4 as
5 l_res clob;
6 l_cnt varchar2(10);
7 l_sc varchar2(10);
8 l_words varchar2(2000);
9 begin
10 l_res := httpuritype
11 ('http://ws.cdyne.com/SpellChecker/check.asmx/CheckTextBodyV2?'
12 || utl_url.escape('BodyText=' || p_word)).getclob();
13 l_cnt := XmlType(l_res).extract
14 ('/DocumentSummary/MisspelledWordCount/text()',
15 'xmlns="http://ws.cdyne.com/').getStringVal();
16 if l_cnt > 0 then
17 l_sc := XmlType(l_res).extract
18 ('/DocumentSummary/MisspelledWord['||1||']/SuggestionCount/text()',
19 'xmlns="http://ws.cdyne.com/').getStringVal();
20 for i in 1 .. l_sc loop
21 l_words := l_words || '|' ||
22 XmlType(l_res).extract
23 ('/DocumentSummary/MisspelledWord['||1||']/Suggestions['||i||']/text()',
24 'xmlns="http://ws.cdyne.com/').getStringVal();
25 end loop;
26 else
27 l_words := p_word;
28 end if;
29 return '(' || ltrim (l_words, '|') || ')';
30 end spell_check;
31 /
Function created.
SCOTT@orcl_11gR2> select spell_check ('serch') from dual
2 /
SPELL_CHECK('SERCH')
--------------------------------------------------------------------------------
(search|such|perch|sch|sash|searches|Zach|searched|searcher|research|Sorcha|sush
i|searchers|searching|searcher's|sashay|Sacha|sushis|sashed|sashes|sash&apo
s;s|researcher|sashing|sushi's|sashays)
1 row selected.
SCOTT@orcl_11gR2> select spell_check ('rabit') from dual
2 /
SPELL_CHECK('RABIT')
--------------------------------------------------------------------------------
(rabbit|habit|robot|rabid|rabbet|rabis|rebid|rubout|Rabat|rabbits|reboot|rowboat
|rabbiter|robots|rubato|Robt|rabbited|rebate|rabbit's|rabidly|rabbets|ribbe
d|rubbed|rubatos|robbed)
1 row selected.
SCOTT@orcl_11gR2> select * from test_tab
2 where contains
3 (test_col,
4 spell_check ('serch')
5 || ' and ' ||
6 spell_check ('rabbit')) > 0
7 /
TEST_COL
------------------------------------------------------------
search for the rabbit
1 row selected.
SCOTT@orcl_11gR2> -- fuzzy search:
SCOTT@orcl_11gR2> select * from test_tab
2 where contains
3 (test_col,
4 '?serch and ?rabbit') > 0
5 /
TEST_COL
------------------------------------------------------------
search for the rabbit
1 row selected.
SCOTT@orcl_11gR2>
Tags: Database
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