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POHow to make recursive query in SQLite?
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  1. POHow to make recursive query in SQLite?
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    copied!<p>if my data structure is like this </p> <pre><code>parentA -------parentAA --------------parentAAA ---------------------childA </code></pre> <p>if i can get "childA.name" . how can i know all the parent name till the top level. so it will be like this > <code>parentA/parentAA/parentAAA/childA</code></p> <p>what is the best way to do this ? </p> <p>i'm working with SQLite and JAVA/android .. thanks in adv.</p> <p><em><strong></em>__<em>_</em>__<em>_</em>__<em>_</em>___</strong> EDIT</p> <p>Okay guys, thanks for all of u . so i just make it by repeating "select query". BOTTOM-UP this is the method i create</p> <pre><code>public String getPath(int id, int type) { StringBuilder pathBuilder = new StringBuilder(); String sql = null; int parentId = 0; if (id == 0) { pathBuilder.insert(0, "/root/"); return pathBuilder.toString(); } if (type == LayerManagementActivity.PARENT) { do { sql = "SELECT id, name, parent_id from parents_table where id=" + id; Cursor c = mDatabase.rawQuery(sql, null); if (c.moveToFirst()) { parentId = c.getInt(2); id = c.getInt(0); pathBuilder.insert(0, "/" + c.getString(1)); c.close(); } id = parentId; } while (parentId != 0); pathBuilder.insert(0, "/root"); pathBuilder.append("/"); } else if (type == LayerManagementActivity.CHILD) { sql = "SELECT id, name, folder_id FROM childs_table WHERE id=" + id; Cursor c = mDatabase.rawQuery(sql, null); if (c.moveToFirst()) { pathBuilder.append(c.getString(1)); id = c.getInt(0); int folderId = c.getInt(2); String path = getPath(folderId, LayerManagementActivity.PARENT); pathBuilder.insert(0, path); } c.close(); } Log.d("crumb", pathBuilder.toString()); return pathBuilder.toString(); } </code></pre>
 

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