前端插入date类型的数据到数据库

 //插入
 @Override
     public boolean insertEmp(Emp emp) {
         String sql = "insert into emp(lwlEmpno,lwlEname,lwlSalary,lwlHiredate,lwlSsex) " +
                 " values('" + emp.getLwlEmpno() + "','" + emp.getLwlEname() + "','" +
                 emp.getLwlSalary() + "',to_date('" + emp.getLwlHiredate() + "','yyyy-mm-dd'),'" + emp.getLwlSsex() + "')";
         log.debug(sql);
         return LwlDao.exeUpdate(sql);
     }

 //修改
 @Override
     public boolean updateEmp(Emp emp, String oldEmpNo) {
         String sql = "update emp set lwlEmpno='" + emp.getLwlEmpno() + "',lwlEname='" + emp.getLwlEname() +
                 "',lwlSalary='" + emp.getLwlSalary() +
                 "',lwlHiredate=to_date('" + emp.getLwlHiredate() + "','yyyy-mm-dd'),lwlSsex='" + emp.getLwlSsex() + "'  where lwlEmpno='" + oldEmpNo + "'";
         log.debug(sql);
         return LwlDao.exeUpdate(sql);
     }

 //获取
  public static List<Emp> getEmp(String sql) {
         ArrayList<Emp> lst = new ArrayList<Emp>();
         Connection conn = getConn();
         try {
             Statement st = conn.createStatement();
             ResultSet rs = st.executeQuery(sql);
             while (rs.next()) {
                 Emp emp = new Emp();
                 emp.setLwlEmpno((rs.getString("lwlEmpno")));
                 emp.setLwlEname(rs.getString("lwlEname"));
                 emp.setLwlSalary(Double.parseDouble(rs.getString("lwlSalary")));

                 emp.setLwlHiredate(rs.getDate("lwlHiredate")+"");

                 emp.setLwlSsex(rs.getString("lwlSsex"));
                 lst.add(emp);
             }
         } catch (Exception e) {
             System.err.println(e.getMessage());
         } finally {
             if (conn != null) {
                 try {
                     conn.close();
                 } catch (SQLException e) {
                     System.err.println(e.getMessage());
                 }
             }
         }
         return lst;
     }

 public class Emp {
     private String lwlEmpno;
     private String lwlEname;
     private double lwlSalary;
     private String lwlHiredate;
     private String lwlSsex;

     ………………………………
 }

 create table emp(
   lwlEmpno varchar2(20)  primary key,
   lwlEname varchar2(20),
   lwlSalary number,
   lwlHiredate date,
   lwlSsex varchar2(3)
 )