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POiOS contact search app
 

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    <p>I am developing an app similar to iOS contact app . In my app it would be around 20000 contacts in the list . I would like to perform universal search in this app. Also the search should happen as we type in the search field </p> <p>, Searching "John Australia" will bring the contact where John is in the first name field and Australia in the address field . I used coredata but its performance is very poor (I dont know may be I am using not proper predicates, I used a predicate with combination of OR and AND). </p> <p>So now I moved to sqlite FTS4 data base and using FMDB to search the contacts .Performance is much better than core data .</p> <p>Here is what I did with FTS4</p> <p>imported all contacts to coredata file (uniqID,name,age,email,company,title,address,note,). Now created a fts4 virtual table with uniqID ,searchText,displayName</p> <pre><code>create virtual table searchData using FTS4 (guid, searchText, displayName) </code></pre> <p>And inserted all fields to fts4 table. ie , eg , </p> <pre><code>uniqId name age email company title address note 12312 , John,32,johnsock@style.com , style Inc, CEO , Australia Street-4 , bla bla bla </code></pre> <p>This the row in core data and it is moved to FTS4 table like this </p> <pre><code> uniqID searchText displayName 12312 John John 12312 johnsock@style.com John 12312 Style Inc John 12312 CEO John 12312 Australia Street-4 John 12312 bla bla bla John </code></pre> <p>Now I am performing search in this sqlite fts 4 table . This is my SQL query for "John Australia"</p> <pre><code>SELECT guid,displayName FROM searchData WHERE searchText MATCH John* INTERSECT SELECT guid,displayName FROM searchData WHERE searchText MATCH Australia* </code></pre> <p>If I have 3 words then I will have intersection 3 select query . The output I am getting from this query is working perfectly .</p> <p>Once I getting result from the query I used the display name to populate in tableview </p> <p>I have 2 problems .</p> <p>1 still I am facing performance issue while comparing to iOS native contact app if I have multiple word.</p> <ol> <li><p>If I am searching only one word the performance is very good , but not satisfied with multiword search.</p></li> <li><p>My query wont search email id with like (that is I need to get result even if I search with the work "sock").</p></li> </ol> <p>Is there any algorithm or logic that I could apply in this search ,so that my searching is fast (please consider the multiword search). Also the same time how could I search email id with like query keeping the same better performance </p> <p>Reference :<a href="http://www.sqlite.org/fts3.html" rel="nofollow">http://www.sqlite.org/fts3.html</a></p> <p><a href="http://www.swwritings.com/post/2013-04-30-searching-for-speedy-searching" rel="nofollow">http://www.swwritings.com/post/2013-04-30-searching-for-speedy-searching</a></p>
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