grade.java

教材管理系统,一个完整的学校教材管理系统,可以作为大学生课程设计使用

package tom.bean;
import java.sql.*;
import java.util.*;
import tom.bean.Dbconnection;

public class Grade {
	private int gradeid;
	private String grade;
	private String action;
	private String condition;
     private ResultSet rs;
     private int rowcount;
     private String message;
     private int id;
    public Grade() {
    	gradeid=0;
     	grade=null;
     	message=null;
    }
    //
    public void setAction(String s)
    {
    	action=s;
    }
    //
    public void setGradeid(int n)
    {
    	gradeid=n;
    }
    public int getGradeid()
    {
    	return gradeid;
    }
    //
    public void setGrade(String s)
    {
    	grade=s;
    }
    public String getGrade()
    {
    	return grade;
    }
    //
    public void setId(int n)
    {
    	id=n;
    }
    public int getId()
    {
    	return id;
    }
    public String getMessage()
    {
    	return message;
    }
    //
    public int getRowcount()
    {
    	return rowcount;
    }
    //
    public ResultSet gradelist()
    {
    	condition="SELECT * from grade order by gradeid";
    	Dbconnection e=new Dbconnection();
        e.condb();
    	rs=e.select(condition);
    	rowcount=e.getRowcount();
        message=e.getMessage();
    	return rs;
    }
    //
    public void selectspec()
    {
    	condition="SELECT * from grade where gradeid="+gradeid;
    	Dbconnection e=new Dbconnection();
        e.condb();
    	rs=e.select(condition);
    	try{
    		rs.next();
    		gradeid=rs.getInt(1);
    		grade=rs.getString(2);
    	}
    	catch(SQLException f){message="error";}
    }
    public void ManageGrade()
    {
    	if(action.equals("add"))
    	condition="INSERT INTO grade VALUES"+"("+gradeid+","+"'"+grade+"')";
        if(action.equals("edit"))
        condition="update grade set gradeid="+gradeid+",grade='"+grade+"' where gradeid="+id;
        if(action.equals("delete"))
        condition="DELETE FROM grade WHERE gradeid="+gradeid; 
        Dbconnection e=new Dbconnection();	
        e.condb();
    	e.update(condition);
        message=e.getMessage();
    	  	
    }
}