关于JDBC连接mysql数据库

package base.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DbOperation {
	protected Connection conn;
	protected PreparedStatement ps;
	protected ResultSet rs;
	private final String uname="root";
	private final String psw="root";
	//��ȡ��ݿ�����
	public void getConn(){		
		try {
			//������
			Class.forName("com.mysql.jdbc.Driver");
			//��ȡ����
			conn = DriverManager.getConnection(
					"jdbc:mysql:///taotao",uname,psw);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}	
	}
	//�ر�
	public void closeAll(){
			try {
				if(conn!=null){
					conn.close();
				}
				if(ps!=null){
					ps.close();
				}
				if(rs!=null){
					rs.close();
				}
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
	}
	
	//����  Object... ��Ѵ������������object���͵ı�����װ��һ������
	public void extUpdate(String sql, Object... obj){
		try {
			ps=conn.prepareStatement(sql);
			for(int i=0;i<obj.length;i++){
				ps.setObject(i+1, obj[i]);
			}
			ps.executeUpdate();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	//��ѯ
	public void extQuery(String sql, Object... obj){
		try {
			ps=conn.prepareStatement(sql);
			for(int i=0;i<obj.length;i++){
				ps.setObject(i+1, obj[i]);
			}
			rs=ps.executeQuery();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

JDBC连接类

dao层只需要继承该类并写操作数据库的方法即可

eg：

package base.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;



import java.util.ArrayList;

import base.util.DbOperation;
import base.vo.user;



public class regdao  extends DbOperation{
public void  adduser(user user) {
	//链接数据库
	getConn();
	//sql语句
	String sql="insert into user (id,username,password) values (?,?);";
	extUpdate(sql, user.getUsername(),user.getPassword());

	
	closeAll();
	
}
}