mysql数据库修改添加Date格式列的方法

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import java.sql.*;import java.text.DateFormat;//数据库的查询public class SelectTable {     String dbDriver="com.mysql.jdbc.Driver";       String dbUrl="jdbc:mysql://localhost:3306/sss";//根据实际情况变化      String username="root";      String password="123";      public Connection getConn()      {        Connection conn=null;        try        {          Class.forName(dbDriver);        }        catch (ClassNotFoundException e)        {          e.printStackTrace();        }        try        {          conn = DriverManager.getConnection(dbUrl,username,password);//注意是三个参数        }        catch (SQLException e)        {          e.printStackTrace();        }        return conn;      }   public void select(){Connection conn = getConn();try{ Statement stmt = conn.createStatement(); //创建Statement对象        System.out.println("成功连接到数据库！");        String sql = "select * from jdbc";  //要执行的SQL        ResultSet rs = stmt.executeQuery(sql);//创建数据对象          System.out.println("id"+"\t"+"name"+"\t"+"brithday");        while (rs.next()){                  System.out.print(rs.getInt(1) + "\t");          System.out.print(rs.getString(2) + "\t");          System.out.print(rs.getDate(3) + "\t");          System.out.println();        }}catch(Exception e){e.printStackTrace();}                      } public void insert(){Connection conn = getConn();try{Statement stmt = conn.createStatement();System.out.println("成功连接到数据库！");String sql = "insert into jdbc (id,name,birthday) values(?,?,?)";PreparedStatement pst =conn.prepareStatement(sql);DateFormat df = DateFormat.getDateInstance();  java.util.Date dd = df.parse("2000-12-12");//将YYYY-MM-DD格式的时间转换为datelong t = dd.getTime();java.sql.Date date = new java.sql.Date(t);   pst.setInt(1, 5);pst.setString(2, "limazhi");pst.setDate(3, date);pst.executeUpdate();select();}catch(Exception e){e.printStackTrace();}  }public static void main(String args[]){SelectTable st = new SelectTable();st.insert();}      }