getting value from the database column

Question

I am trying to get the value of column threadid where id(which is unique) is equal to the id I am sending to the getthreadid function.threadid contains the values in data type long, But I don't know why my app crashes in doing this,Please help,Thanks in advance.

long id;
long threadid = datasource.getthreadid(id);
Toast.makeText(getActivity(), String.valueOf(threadid), Toast.LENGTH_SHORT).show();

public long getthreadid(long id)
{
    String ide = String.valueOf(id);
    String queryz = "SELECT " + "," + MySQLiteHelper.COLUMN_THREADID 
        + " FROM " + MySQLiteHelper.TABLE_NAME 
        + " WHERE " + MySQLiteHelper.COLUMN_ID + "=" + ide;
    Cursor cursor = database.rawQuery(queryz, null);
    long threadid = cursor.getLong(cursor.getColumnIndex("threadid"));
    return threadid;
}

My database create query is:

static final String DATABASE_CREATE = "create table "+"message"+
            "( " +"id"+" integer primary key autoincrement,"+ "threadid long,parentid integer,message  text not null,messagestatus text); ";

Answer 1

I think your query is wrong

 String queryz = "SELECT " + "," + MySQLiteHelper.COLUMN_THREADID 
        + " FROM " + MySQLiteHelper.TABLE_NAME 
        + " WHERE " + MySQLiteHelper.COLUMN_ID + "=" + ide;

Expected Output "SELECT , COLUMN FROM TABLE WHERE COLUMNID = VALUE " A WRONG QUERY

Should be this

  String queryz = "SELECT " + MySQLiteHelper.COLUMN_THREADID 
            + " FROM " + MySQLiteHelper.TABLE_NAME 
            + " WHERE " + MySQLiteHelper.COLUMN_ID + "=" + ide;

Expected Output "SELECT COLUMN FROM TABLE WHERE COLUMNID = VALUE "

Check for your database!=null and then database.isOpen() and if executes the

check your cursor!= null and then cursor.getCount() > 0