基于JAVAEE的学生管理系统

package com.neusoft.dao; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; public class DeptDaoImpl implements DeptDao { @Override public void insertDept(Dept dept) { // TODO Auto-generated method stub Connection conn=null; PreparedStatement pstmt=null; try { conn=DbUtils.getConnection(); //3.操作数据库 String sql="insert into dept(deptno,dname,loc) values(?,?,?)"; pstmt=conn.prepareStatement(sql); pstmt.setInt(1, dept.getDeptno()); pstmt.setString(2, dept.getDname()); pstmt.setString(3,dept.getLoc()); pstmt.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally { //4.关闭数据库 DbUtils.closePreparedStatement(pstmt); DbUtils.closeConnection(conn); } } @Override public void updateDept(Dept dept) { // TODO Auto-generated method stub Connection conn=null; PreparedStatement pstmt=null; try { conn=DbUtils.getConnection(); String sql="update dept set dname=?,loc=? where deptno=?"; pstmt=conn.prepareStatement(sql); pstmt.setString(1, dept.getDname()); pstmt.setString(2, dept.getLoc()); pstmt.setInt(3, dept.getDeptno()); pstmt.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally { //4.关闭数据库 DbUtils.closePreparedStatement(pstmt); DbUtils.closeConnection(conn); } } @Override public void deleteDept(int deptno) { // TODO Auto-generated method stub Connection conn=null; PreparedStatement pstmt=null; try { conn=DbUtils.getConnection(); String sql="delete from dept where deptno=?"; pstmt=conn.prepareStatement(sql); pstmt.setInt(1, deptno); pstmt.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally { //4.关闭数据库 DbUtils.closePreparedStatement(pstmt); DbUtils.closeConnection(conn); } } @Override public List<Dept> getDepts() { Connection conn=null; PreparedStatement pstmt=null; ResultSet rs=null; List<Dept> depts=new ArrayList<Dept>(); try { conn=DbUtils.getConnection(); //3.操作数据库 String sql="select * from dept"; pstmt=conn.prepareStatement(sql); rs=pstmt.executeQuery(); while(rs.next()) { Dept dept=new Dept(); dept.setDeptno(rs.getInt("DEPTNO"));// dept.setDname(rs.getString("DNAME")); dept.setLoc(rs.getString("LOC")); depts.add(dept); } }catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally { DbUtils.closeResultSet(rs); DbUtils.closePreparedStatement(pstmt); DbUtils.closeConnection(conn); } return depts; } @Override public Dept getDeptByDeptno(int deptno) { Connection conn=null; PreparedStatement pstmt=null; ResultSet rs=null; Dept dept=new Dept(); try { conn=DbUtils.getConnection(); //3.操作数据库 String sql="select * from dept where deptno=?"; pstmt=conn.prepareStatement(sql); pstmt.setInt(1, deptno); rs=pstmt.executeQuery(); if(rs.next()) { dept.setDeptno(rs.getInt("DEPTNO")); dept.setDname(rs.getString("DNAME")); dept.setLoc(rs.getString("LOC")); } }catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally { DbUtils.closeResultSet(rs); DbUtils.closePreparedStatement(pstmt); DbUtils.closeConnection(conn); } return dept; } }