classp.java

这是书上的<java毕业设计指南与项目实践>的第6章:基于JSP+JavaBean+Servlet的课程管理系统,供大家参考

package com.course;
import java.sql.*;
public class classp  {
  //定义班级相关的信息
  private String id;
  private String cour_id;
  private String tea_id;
  private String room_id;
  private String cour_time;
  public String getId() {
    return id;
  }
  public void setId(String id) {
    this.id = id;
  }
  public String getCour_id() {
    return cour_id;
  }
  public void setCour_id(String cour_id) {
    this.cour_id = cour_id;
  }
  public String getTea_id() {
    return tea_id;
  }
  public void setTea_id(String tea_id) {
    this.tea_id = tea_id;
  }
  public String getRoom_id() {
    return room_id;
  }
  public void setRoom_id(String room_id) {
    this.room_id = room_id;
  }
  public String getCour_time() {
    return cour_time;
  }
  public void setCour_time(String time) {
    this.cour_time = time;
  }
  //得到全部教师信息
  public ResultSet getTeachers(){
  	String sql="select id,name from teacher  ";
  	sqlBean db = new sqlBean();
  	ResultSet rs = db.executeQuery(sql);
  	return rs;
  	                          }
  //得到全部课程信息	                          
  public ResultSet getCourses(){
  	  	String sql="select id,name from course  ";
  	sqlBean db = new sqlBean();
  	ResultSet rs = db.executeQuery(sql);
  	return rs;  	          
                              }
    //检查班级是否已经存在                          
   	public boolean hasLogin(String id){   
  	boolean f=false;
    String sql="select id from classes where id ='"+id+"'";
  	sqlBean db =new sqlBean();
  	try{
  	ResultSet rs=db.executeQuery(sql);
  	if(rs.next()){ f=true;}
  	else{ f=false;}
  	}catch(Exception e){ e.getMessage();}
  	return f;
  	                       }
//  检查教师是否同一时间上两门课程                                                                              
   public String hasMoreclass(String tea_id,String cour_time){   
    
    String temp="";
    String sql="select id from classes  "+
               "where tea_id='"+tea_id+"' and cour_time='"+cour_time+"'   "; 
      sqlBean db =new sqlBean();         	
    	try{
  	ResultSet rs=db.executeQuery(sql);
  	if(rs.next()){ temp=rs.getString("id");}
  	else{ temp="no";}
  	}catch(Exception e){ System.out.print(e.getMessage());}
  	return temp;        
  	                  }
  	                  
  //添加班级 	                  
  public void addClass(){
  		
  	String sql="insert into classes(id,tea_id,cour_id,room_id,cour_time)  "+
  	           "values('"+id+"','"+tea_id+"','"+cour_id+"','"+room_id+"','"+cour_time+"') ";
  	    try{       
  		sqlBean db =new sqlBean(); 
  		db.executeInsert(sql);} catch(Exception e){System.out.print(e.toString());}
  		}
  		
  	//更新班级信息	
   public void updateClass(String id,String tea_id,String cour_id,
                           String room_id,String cour_time){    	
      String sql="update classes "+
                 " set tea_id='"+tea_id+"',cour_id='"+cour_id+"',"+
                 "room_id='"+room_id+"',cour_time='"+cour_time+"'  "+
                 " where id='"+id+"' ";
                 sqlBean db= new sqlBean();
                 db.executeInsert(sql);
                 }
    //更新班级信息的异构形式，不包含教师和时间参数             
  public void updateClass(String id,String cour_id,
                          String room_id){    	
      String sql="update classes "+
                 " set cour_id='"+cour_id+"',"+
                 "room_id='"+room_id+"' "+
                 " where id='"+id+"' ";
                 sqlBean db= new sqlBean();
                 db.executeInsert(sql);
                 }       
    //删除班级             
   public int deleteClass(String id){  
        int num=0; 	
    	String sql="delete  from classes where id ='"+id+"' ";
    	sqlBean db= new sqlBean();
        num=db.executeDelete(sql);
        return num;
    	}
    //得到全部班级信息	
   public ResultSet getClasses(){
   	
   	String sql="select classes.id,tea_id,cour_id,room_id,cour_time, "+
			"course.name as cour_name,teacher.name as tea_name "+
      		"from classes ,course,teacher  "+
     		"where classes.cour_id=course.id "+
    		"and classes.tea_id=teacher.id ";
   			sqlBean db= new sqlBean();
		ResultSet rs = db.executeQuery(sql);
		 return rs;           
   	} 	                                           	
 	   	                 
  
}