Mysql - updating only one row

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.HashMap;
import java.util.Iterator;

public class DatabaseOperations {
	DBConnection conn = new DBConnection();
	Connection con = conn.connDb();
	Statement statement = null;
	PreparedStatement preparedStatement = null;

	public void insertWordCount(HashMap<String, Integer> map) throws SQLException {
		Iterator<String> wordIterator = map.keySet().iterator();
		String sql = ("INSERT INTO words" + "(count, word)" + "VALUES (?,?)");
		statement = con.createStatement();
		preparedStatement = con.prepareStatement(sql);
		while (wordIterator.hasNext()) {
			String key = wordIterator.next();
			ResultSet rs = statement.executeQuery("SELECT * FROM words WHERE word='" + key + "'");
			String query = "UPDATE words SET count= ? WHERE word = ?";
			preparedStatement.setInt(1, map.get(key));
			preparedStatement.setString(2, key);
			preparedStatement.executeUpdate();
			while (rs.next()) {
				preparedStatement = con.prepareStatement(query);
				int oldCount = rs.getInt(1);
				int newCount = oldCount + map.get(key);
				preparedStatement.setInt(1, newCount);
				preparedStatement.setString(2, key);
				preparedStatement.executeUpdate();
			}

		}
	}