javaweb 学校管理系统 jsp+servlet+javabean

package jdbc; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.List; import util.DBConnection; public class StudentCRUD { //add public static void add( String stuid,String sname,String sex,String age,String birthday,String classname) throws SQLException { Connection conn = null; PreparedStatement ps = null; ResultSet rs = null; try{ conn = DBConnection.getConnection(); String sql = "insert into student(stuid,sname,sex,age,birthday,classname) values(?,?,?,?,?,?)"; ps = conn.prepareStatement(sql); ps.setString(1, stuid); ps.setString(2, sname); ps.setString(3, sex); ps.setString(4, age); ps.setString(5, birthday); ps.setString(6, classname); ps.executeUpdate(); }finally{ DBConnection.close(rs, ps, conn); } } //add with transaction /*public static void addwithtrans() throws SQLException { Connection conn = null; PreparedStatement ps1 = null; PreparedStatement ps2 = null; ResultSet rs = null; try{ conn = DBConnection.getConnection(); conn.setAutoCommit(false); String sql1 = "insert into user(id,name,password,sex,age,birthday) values(2,'zhangsan','123','man',21,'1990-12-31')"; String sql2="insert into student(stuid,name,sex,age,birthday) values(2,'zhangsan','man',21,'1990-12-31')"; ps1 = conn.prepareStatement(sql1); ps1.executeUpdate(); ps2 = conn.prepareStatement(sql2); ps2.executeUpdate(); conn.commit(); }catch(SQLException e){ conn.rollback(); }finally{ conn.setAutoCommit(true); DBConnection.close(null, ps1, null); DBConnection.close(rs, ps2, conn); } }*/ //update /*public static void update() throws SQLException { Connection conn = null; Statement st = null; ResultSet rs = null; try{ conn = DBConnection.getConnection(); String sql = "update student set sname='lisi' where stuid='stuid'"; st = conn.createStatement(); st.executeUpdate(sql); }finally{ DBConnection.close(rs, st, conn); } }*/ //delete /*public static void delete() throws SQLException { Connection conn = null; Statement st = null; ResultSet rs = null; try{ conn = DBConnection.getConnection(); String sql = "delete from student where stuid='stuid'"; st = conn.createStatement(); st.executeUpdate(sql); }finally{ DBConnection.close(rs, st, conn); } }*/ //get /*public static void get() throws SQLException { Connection conn = null; Statement st = null; ResultSet rs = null; try{ conn = DBConnection.getConnection(); String sql = "select stuid,sname, sex,age,birthday,classname from student"; st = conn.createStatement(); rs = st.executeQuery(sql); while(rs.next()){ int id=rs.getInt("id"); String name=rs.getString("name"); String password=rs.getString("password"); String sex=rs.getString("sex"); int age=rs.getInt("age"); Date birthday = rs.getDate("birthday"); System.out.println("id=" + id + ";name=" + name + ";password=" + password + ";sex=" + sex + ";age=" + age + ";birthday=" + birthday); } }finally{ DBConnection.close(rs, st, conn); } }*/ public static List<Student> get()throws SQLException { List<Student> stuList = new ArrayList<Student>(); Connection conn =null; Statement st = null; ResultSet rs = null; try{ conn = DBConnection.getConnection(); String sql = "select * from student;"; st = conn.createStatement(); rs = st.executeQuery(sql); while (rs!=null&&rs.next()) { Student stu = new Student(); String stuid = rs.getString("stuid"); String sname = rs.getString("sname"); String sex = rs.getString("sex"); int age = rs.getInt("age"); String birthday = rs.getString("birthday"); String classname = rs.getString("classname"); stu.setStuid(stuid); stu.setSname(sname); stu.setSex(sex); stu.setAge(age); stu.setBirthday(birthday); stu.setClassname(classname); stuList.add(stu); } }catch(Exception e){ e.printStackTrace(); System.out.println(e.getMessage()); } return stuList; } public static Student get(String stuid)throws SQLException{ Connection conn = null; PreparedStatement ps = null; ResultSet rs = null; Student stu = new Student(); try{ conn = DBConnection.getConnection(); String sql = "select sname,sex,age,birthday,classname from student where stuid=?"; ps = conn.prepareStatement(sql); ps.setString(1, stuid); rs = ps.executeQuery(); while(rs.next()){ String sname = rs.getString("sname"); String sex = rs.getString("sex"); int age = rs.getInt("age"); String birthday = rs.getString("birthday"); String classname = rs.getString("classname"); stu.setSname(sname); stu.setSex(sex); stu.setAge(age); stu.setBirthday(birthday); stu.setClassname(classname); } }catch(SQLException e){ System.out.println("错误："+e.getMessage()); }finally{ DBConnection.close(rs, ps, conn); } return stu; } public static boolean update(String stuid,String sname,String sex,String age,String birthday,String classname) throws SQLException{ Connection conn = null; PreparedStatement ps = null; boolean successflag=false; try{ conn = DBConnection.getConnection(); String sql = "update student set sname=?,sex=?,age=?,birthday=?,classname=? where stuid=?"; ps = conn.prepareStatement(sql); ps.setString(1, sname); ps.setString(2, sex); ps.setString(3, age); ps.setString(4, birthday); ps.setString(5, classname); ps.setString(6, stuid); ps.executeUpdate(); successflag=true; }catch(SQLException e){ System.out.println("错误"+e.getMessage()); }finally{ DBConnection.close(null, ps, conn); } return successflag; } public static boolean del(String stuid) throws SQLException{ boolean successflag = false; Connection conn = null; PreparedStatement ps = null; try{ conn = DBConnection.getConnection(); String sql = "delete from student where stuid=?"; ps = conn.prepareStatement(sql); ps.setString(1, stuid); ps.executeUpdate(); successflag = true; }catch(SQLException e){ System.out.println("错误"+e.getMessage()); }finally{ DBConnection.close(null, ps, conn); } return successflag; } }