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From Mead Lai <laiqi...@gmail.com>
Subject Is there any "Query" in Lucene can search the term, which is similar as "SQL-LIKE"?
Date Tue, 11 Oct 2011 07:11:48 GMT
Hello all,
*Background:
*There are *ONE MILLION* data in a table, and this table has 100 columns
inside.
The application need to search the data in EVERY column with one 'keyword'.
so, I try it in a clumsy way, using a database view, then search the view.
Just like the following SQL:
*=Step1*: create a view.

CREATE OR REPLACE VIEW V_MY_VIEW(id,title,content)
as
SELECT
mv.l_instanceid,mv.c_param1,mv.c_param2||';'||mv.c_param3||';'||mv.c_param4||';'||mv.c_param5||';'||mv.c_param6||';'||mv.c_param7||';'||mv.c_param8||';'||mv.c_param9||';'||mv.c_param10||';'||mv.c_param11||';'||mv.c_param12||';'||mv.c_param13||';'||mv.c_param14||';'||mv.c_param15||';'||mv.c_param16||';'||mv.c_param17||';'||mv.c_param18||';'||mv.c_param19||';'||mv.c_param20||';'||mv.c_param21||';'||mv.c_param22||';'||mv.c_param23||';'||mv.c_param24||';'||mv.c_param25||';'||mv.c_param26||';'||mv.c_param27||';'||mv.c_param28||';'||mv.c_param29||';'||mv.c_param30||';'||mv.c_param31||';'||mv.c_param32||';'||mv.c_param33||';'||mv.c_param34||';'||mv.c_param35||';'||mv.c_param36||';'||mv.c_param37||';'||mv.c_param38||';'||mv.c_param39||';'||mv.c_param40||';'||mv.c_param41||';'||mv.c_param42||';'||mv.c_param43||';'||mv.c_param44||';'||mv.c_param45||';'||mv.c_param46||';'||mv.c_param47||';'||mv.c_param48||';'||mv.c_param49||';'||mv.c_param50||';'||mv.c_param51||';'||mv.c_param52||';'||mv.c_param53||';'||mv.c_param54||';'||mv.c_param55||';'||mv.c_param56||';'||mv.c_param57||';'||mv.c_param58||';'||mv.c_param59||';'||mv.c_param60||';'||mv.c_param61||';'||mv.c_param62||';'||mv.c_param63||';'||mv.c_param64||';'||mv.c_param65||';'||mv.c_param66||';'||mv.c_param67||';'||mv.c_param68||';'||mv.c_param69||';'||mv.c_param70||';'||mv.c_param71||';'||mv.c_param72||';'||mv.c_param73||';'||mv.c_param74||';'||mv.c_param75||';'||mv.c_param76||';'||mv.c_param77||';'||mv.c_param78||';'||mv.c_param79||';'||mv.c_param80||';'||mv.c_param81||';'||mv.c_param82||';'||mv.c_param83||';'||mv.c_param84||';'||mv.c_param85||';'||mv.c_param86||';'||mv.c_param87||';'||mv.c_param88||';'||mv.c_param89||';'||mv.c_param90||';'||mv.c_param91||';'||mv.c_param92||';'||mv.c_param93||';'||mv.c_param94||';'||mv.c_param95||';'||mv.c_param96||';'||mv.c_param97||';'||mv.c_param98||';'||mv.c_param99||';'||mv.c_param100||';'
FROM MyTable mv

*=Step2*: search the view with LIKE '%keyword%'

SELECT *
FROM V_MY_VIEW wcv
WHERE wcv.content LIKE '%keyword%'

Finally, it works nice, but inefficiency, almost cost 5~7 seconds. cos ONE
MILLION rows are tooo huge.

*Lucene way:*
    So, I use the Lucene to store these ONE MILLION data,
code:document.add(new Field("content", content, Store.YES,
Index.ANALYZED));//variable content, is the strings which jointed from the
100 columns
     The problem is that: if some keyword is not a word or a term, the
search will return nothing.
Usually, the keyword would be a person's name or some jargon, like
'catstiger.amber','amin.ahmad','fund-in-trust'.
and 'catstiger.amber' can't be split into a term to save in the index store
    Cos, the Index.ANALYZED would fail to recognition the keyword as a term
, so there is no such index at all.
So, In short, is there any "Query" in Lucene can search the term, which is
similar as "SQL-LIKE"?

    This SQL-function will meet the purpose:

SELECT * FROM luceneDB ldb
WHERE ldb.content *LIKE* '%keyword%'

Thank you very much.

Regards,
Mead

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