Question

I am trying to get the first column like below sql but my code show error.

SELECT subject FROM setting WHERE rowid=1

    public void getSetting(){
    result = "";

SQLiteDatabase db = myDbHelper.getReadableDatabase();   

Cursor c = db.query(true, "setting", new String[] {"subject", "language", "selection"}, "row=1", null, null, null, null, null);

    for(c.moveToFirst();!(c.isAfterLast());c.moveToNext()){

result = result + c.getString(0);
result = result + c.getString(0);
    result = result + c.getString(0);
    }
    if (c.getCount() == 0)              
    result = result + "result not found";   

c.close();      
db.close();         
myDbHelper.close(); 

}             

Answer 1

Your stuff is a little hard to understand, but i think i have an idea what you want. You what to get a cursor to return only one row where the row’s id is a specific value. And you only want the string from one column of that returned row. I assume that the primary issue is your designation of the _id column that you’re looking for. You either called it row or rowid, you gotta double-check that.

Moreover, i hope the following re-write clears up further issues that you might have.

public String getSetting() {
    String result = "";
    String[] columns = {"subject"}; 
    String[] selectionArgs = {"1"};
    String LIMIT = String.valueOf(1); // <-- number of results we want/expect

    SQLiteDatabase db = myDbHelper.getReadableDatabase();   
    Cursor c = db.query(true, "setting", columns, "rowid = ?", selectionArgs, null, null, null, LIMIT);     

    if (c.moveToFirst()) {
        result = result + c.getString(0);
    } else {
        result = result + "result not found";
    }

    c.close();      
    myDbHelper.close();
    return result;
}    

Moreover, moreover. If you get an error you should post it so that we have an idea what’s going on.