Iterate through rows from Sqlite-query

Question

I have a table layout that I want to populate with the result from a database query. I use a select all and the query returns four rows of data.

I use this code to

Answer 1

Found a very simple way to iterate over a cursor

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


    // access the curosr
    DatabaseUtils.dumpCurrentRowToString(cursor);
    final long id = cursor.getLong(cursor.getColumnIndex(BaseColumns._ID));


}

Answer 2

Iteration can be done in the following manner:

Cursor cur = sampleDB.rawQuery("SELECT * FROM " + Constants.TABLE_NAME, null);
ArrayList temp = new ArrayList();
if (cur != null) {
    if (cur.moveToFirst()) {
        do {
            temp.add(cur.getString(cur.getColumnIndex("Title"))); // "Title" is the field name(column) of the Table                 
        } while (cur.moveToNext());
    }
}

Answer 3

public void SQLfunction() {
    SQLiteDatabase db = getReadableDatabase();
    SQLiteQueryBuilder qb = new SQLiteQueryBuilder();

    String[] sqlSelect = {"column1","column2" ...};
    String sqlTable = "TableName";
    String selection = "column1= ?"; //optional
    String[] selectionArgs = {Value}; //optional

    qb.setTables(sqlTable);
    final Cursor c = qb.query(db, sqlSelect, selection, selectionArgs, null, null, null);

   if(c !=null && c.moveToFirst()){
        do {
           //do operations
           // example : abcField.setText(c.getString(c.getColumnIndex("ColumnName")))

          }
        while (c.moveToNext());
    }


}

NOTE: to use SQLiteQueryBuilder() you need to add

compile 'com.readystatesoftware.sqliteasset:sqliteassethelper:+' in your grade file

Answer 4

Cursor objects returned by database queries are positioned before the first entry, therefore iteration can be simplified to:

while (cursor.moveToNext()) {
    // Extract data.
}

Reference from SQLiteDatabase.

Answer 5

for (boolean hasItem = cursor.moveToFirst(); hasItem; hasItem = cursor.moveToNext()) {
    // use cursor to work with current item
}

Answer 6

I agree to chiranjib, my code is as follow:

if(cursor != null && cursor.getCount() > 0){
  cursor.moveToFirst();
  do{
    //do logic with cursor.
  }while(cursor.moveToNext());
}