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POAndroid SQLite SELECT WHERE LIKE unexpected behavior
 

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    <p>I have an android application with a SQLite database and I am trying to implement a search interface. First of all, I realize that making a FTS database is the way to go, but I thought that I could use a LIKE statement and get similar results if I use wildcards. That way the interface can be tested and the backend updated later.</p> <p>Here is how I build the query:</p> <pre><code>public Cursor getMatching(String query) { Cursor mCursor = db.query(false, TABLE, new String[] { KEY_ROWID, KEY_NAME }, KEY_NAME + " LIKE ?", new String[] { "%" + query + "%" }, null, null, null, null); if (mCursor != null) { mCursor.moveToFirst(); } return mCursor; } </code></pre> <p>KEY_NAME is the text column that I want results for, and query is the lowercase string that I want to match against. I would expect that it would return results where the query appears anywhere in the name, case insensitive. However, what I observe is different. The results of querying "" (empty string):</p> <pre><code>Coch**** **** Squi*** St***** Owe** **** Smi** Ca**** G. Bur** Jo****** Gr******* Brown </code></pre> <p>Now when I query "o":</p> <pre><code>Owe** **** G. Bur** Jo****** Gr******* Brown </code></pre> <p>Oddly enough, the first result is filtered out, although it contains an 'o'. When I query "ow":</p> <pre><code>Gr******* Brown </code></pre> <p>And finally when I query with "own":</p> <pre><code>null </code></pre> <p>Here is the method I use to handle the cursor:</p> <pre><code>public static void logMatches(Context context, String query) { DBAdapter adapter = new DBAdapter(context); adapter.open(); Cursor c = adapter.getMatching(query); if (c == null) return; while (c.moveToNext()) { String name = c.getString(c .getColumnIndex(DBAdapter.KEY_NAME)); Log.d(TAG, name); } c.close(); adapter.close(); } </code></pre> <p>Where DBAdapter contains the SQLiteOpenHelper. The context I am passing in comes from a ContentProvider by using the getContext() method.</p> <p>I want to implement a FTS table eventually, but my database is quite small now so I hoped that I could implement similar functionality using existing tables for now. Is it possible to do what I want with the LIKE clause? Am I making an obvious mistake?</p>
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