project_manager.java

java语言编写的程序

package cn.lab.business;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import cn.lab.dbquery.DataProcess;
import cn.lab.object.Project;

public class Project_Manager {
	public static void Add_Project(String name,String info,String time)
	{
		try{
			name = new String(name.getBytes("ISO8859_1"));
			info = new String(info.getBytes("ISO8859_1"));
			time = new String(time.getBytes("ISO8859_1"));
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		String query = "insert into project(name,info,time)values('"+name+
			"','"+info+"','"+time+"')";
		try {
			DataProcess.ExeQuery(query);
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}
	
	public static void Edit_Project(int id,String name,String info,String time)
	{
		try
		{
			name = new String(name.getBytes("ISO8859_1"));
			info = new String(info.getBytes("ISO8859_1"));
			time = new String(time.getBytes("ISO8859_1"));
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		String query="update project set name='"+name+"',info='"+info+
			"',time='"+time+"'where id="+id;
		try {
			DataProcess.ExeQuery(query);
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}
	
	public static void Delete_Project(int id)
	{
		String query="delete from project where id="+id;
		try {
			DataProcess.ExeQuery(query);
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}
	
	public static Project getProject(int ID)
	{
		String selectStr="select from project where id="+ID;
		
		Connection con =DataProcess.getConnection();
		Project pro = Project.getInstance();
		
		try
		{
			Statement stmt = con.createStatement();
			ResultSet rs = stmt.executeQuery(selectStr);
			if(rs.next())
			{
				String name = rs.getString("name");
				String info = rs.getString("info");
				String time = rs.getString("time");
				
				pro.setId(ID);
				pro.setName(name);
				pro.setInfo(info);
				pro.setTime(time);
			}
			
			rs.close();
			stmt.close();
			con.close();
			return pro;
		}
		catch(Exception e)
		{
			e.printStackTrace();
			return null;
		}
	}
	
	
	public static ArrayList getProjectList()
	{
		String query="select * from project ";
		Connection con =DataProcess.getConnection();
		ArrayList pl = new ArrayList();
		
		try
		{
			Statement stmt = con.createStatement();
			ResultSet rs = stmt.executeQuery(query);
			
			while(rs.next())
			{
				int ID = rs.getInt("id");
				String name = rs.getString("name");
				String info = rs.getString("info");
				String time = rs.getString("time");
				Project pro = Project.getInstance();
				
				pro.setId(ID);
				pro.setName(name);
				pro.setInfo(info);
				pro.setTime(time);
				
				pl.add(pro);
			}
			
			rs.close();
			stmt.close();
			con.close();
			return pl;
		}
		catch(Exception e)
		{
			e.printStackTrace();
			return null;
		}
	}

}