Android Sqlite Query Detect When An Element Doesn't Exists In The Table

How can I detect when an element doesn't exist in my table? I need because I want to update/insert contacts on it. My problem it's that I want to insert a new contact by using Cont

Solution 1:

use a boolean value to check whether the contact exist or not

boolean contact = myDbHelper.checkidExitsorNot(ur table name,row name , value);

publicbooleancheckidExitsorNot(String tablename, String rowname, String id) {
    String queryf = "select * from " + tablename + " where " + rowname  + "='" + Integer.valueOf(id) + "'";

    Cursor c = myDataBase.rawQuery(queryf, null);
    if (c.getCount() == 0) {
        c.close();
        returntrue;
    }else {
        c.close();
        returnfalse;
    }
}

if the return is true then it does not exist if false it exist

Solution 2:

You can check by using count(*) function in database.