mysql获取返回的主键

因为线程安全问题所以得用这方法获得主键Id

public class key {     //获取主键第一种      @Test      //select LAST_INSERT_ID()    //这是第二种      public void insert(){          Connection cn = JDBCU.getConnection();          String sql ="insert into student set sname='ss',sage="+15;          try {            PreparedStatement pst = cn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS);              pst.executeUpdate();              ResultSet rs = pst.getGeneratedKeys();              while(rs.next()){                  System.out.println(rs.getObject(1));              }        } catch (SQLException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }      }}