SQL statement, updateString and updateRow

Question

i need some help by using updateString an updateRow
i have to update some databases ever 3 months.
all together 250,000 datasets.
one row should be read out, modified and written back.
at the moment i do it like that:
rs = dbconnect ...(..."select rrn(database),database.row from database)
while (rs.next())
str = rs.getString(2);
i = rs.getInt(1);
..executeSqlStatement(..."update database set row = " + str + " where rrn(database) = "+i);
rs.close();
but that is very longlasting.
i tryed it with updateString and updateRow, but it didn't work.
Is it possible to say SQL, if one hit made, stop the search?
my statements alsways run through the hole databases, although
its sure that there is only one hit, especially if the "rrn"-statement is
included in the condition.
is

Answer 1

we use our "own" connect-method, called dbconnect:
statement = getConnection(x_systemname).createStatement();
rs = statement.executeQuery(x_sqlstatement);
return rs;You need to explicitly say it whether you want a ResultSet updatable:
stm = getConnection(x_systemname)
  .createStatement(
    ResultSet.TYPE_SCROLL_INSENSITIVE,
    ResultSet.CONCUR_UPDATABLE
  );That way you are able to perform updates with updateXXX() methods and updateRow() at the end.