教务管理系统(jsp+servlet+mysql)毕业设计—（包含完整源码可运行）.zip

package com.bjsxt.drp.business.usermgr.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.sql.Timestamp; import java.util.ArrayList; import java.util.List; import com.bjsxt.drp.business.usermgr.model.User; import com.bjsxt.drp.business.util.DB; /** * 用户增删改查Dao层MySql实现 * */ public class UserDao4MySqlImpl implements UserDao { /** * 增加用户 * @param conn * @param user user对象 */ public void addUser(Connection conn, User user) { String sql = "insert into t_user(user_id, user_name, password, contact_tel, email, create_date) " + "values(?, ?, ?, ?, ?, ?)"; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement(sql); pstmt.setString(1, user.getUserId()); pstmt.setString(2, user.getUserName()); pstmt.setString(3, user.getPassword()); pstmt.setString(4, user.getContactTel()); pstmt.setString(5, user.getEmail()); pstmt.setTimestamp(6, new Timestamp(user.getCreateDate().getTime())); pstmt.executeUpdate(); } catch (SQLException e) { e.printStackTrace(); } finally { DB.closeStmt(pstmt); } } /** * 根据userId的集合删除用户 * @param conn * @param userIdList userId的集合 */ public void deleteUsers(Connection conn, String[] userIdList) { StringBuffer sbfSql = new StringBuffer(); for (int i = 0; i < userIdList.length; i++) { sbfSql.append("'") .append(userIdList[i]) .append("'") .append(","); } String sql = "delete from t_user where user_id in (" + sbfSql.substring(0, sbfSql.length()-1) + ")"; Statement stmt = null; try { stmt = conn.createStatement(); stmt.executeUpdate(sql); }catch(SQLException e) { e.printStackTrace(); }finally { DB.closeStmt(stmt); DB.closeConn(conn); } } /** * 查询所有用户 * @return user对象列表 */ public List findAllUserList() { String sql ="select * from t_user where user_id <> 'root' order by user_id "; Connection conn = null; Statement stmt = null; ResultSet rs = null; List userList = new ArrayList(); try { conn = DB.getConn(); stmt = conn.createStatement(); rs = stmt.executeQuery(sql); while (rs.next()) { User user = new User(); user.setUserId(rs.getString("user_id")); user.setUserName(rs.getString("user_name")); user.setPassword(rs.getString("password")); user.setContactTel(rs.getString("contact_tel")); user.setEmail(rs.getString("email")); user.setCreateDate(rs.getTimestamp("create_date")); userList.add(user); } }catch(SQLException e) { e.printStackTrace(); }finally { DB.closeRs(rs); DB.closeStmt(stmt); DB.closeConn(conn); } return userList; } /** * 根据用户id查询用户 * @param userId 用户id * @return user对象 */ public User findUserById(String userId) { String sql = "select * from t_user where user_id=?"; User user = null; Connection conn = null; PreparedStatement pstmt = null; ResultSet rs = null; try { conn = DB.getConn(); pstmt = conn.prepareStatement(sql); pstmt.setString(1, userId); rs = pstmt.executeQuery(); if (rs.next()) { user = new User(); user.setUserId(rs.getString("user_id")); user.setUserName(rs.getString("user_name")); user.setPassword(rs.getString("password")); user.setContactTel(rs.getString("contact_tel")); user.setEmail(rs.getString("email")); user.setCreateDate(rs.getTimestamp("create_date")); } }catch(SQLException e) { e.printStackTrace(); }finally { DB.closeRs(rs); DB.closeStmt(pstmt); DB.closeConn(conn); } return user; } /** * 修改用户 * @param conn * @param user user对象 */ public void modifyUser(Connection conn, User user) { String sql = "update t_user set user_name=?, password=?, contact_tel=?, email=? where user_id=?"; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement(sql); pstmt.setString(1, user.getUserName()); pstmt.setString(2, user.getPassword()); pstmt.setString(3, user.getContactTel()); pstmt.setString(4, user.getEmail()); pstmt.setString(5, user.getUserId()); pstmt.executeUpdate(); }catch(SQLException e) { e.printStackTrace(); }finally { DB.closeStmt(pstmt); } } }