code: public int update(Connection conn, String sql, Object param)
          throws SQLException {
  
          return this.update(conn, sql, new Object[] { param });
      }
docs: Execute an SQL INSERT, UPDATE, or DELETE query with a single replacement
  parameter.
  
  @param conn The connection to use to run the query.
  @param sql The SQL to execute.
  @param param The replacement parameter.
  @return The number of rows updated.
  @throws java.sql.SQLException if a database access error occurs