[javaEE] JDBC快速入门

JDBC：Java Data Base Connectivity java数据库连接

 

1.组成JDBC的两个包：主要是接口

java.sql javax.sql

2.相应JDBC的数据库实现

 

在tomcat的目录下面添加mysql-connector-java-5.0.8-bin.jar这个数据库驱动包

 

package com.tsh.web;import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/***/
public class DbServlet extends HttpServlet {private static final long serialVersionUID = 1L;/***/public DbServlet() {super();// TODO Auto-generated constructor stub
    }/***/protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {try {// 注册数据库驱动//DriverManager.registerDriver(new Driver());//使用反射的方式Class.forName("com.mysql.jdbc.Driver");//获取数据库连接，导包的时候，注意要导java.sql下的，面向接口编程Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/java","root","root");//获取传输器对象Statement statement=conn.createStatement();//获取结果集对象ResultSet resultSet=statement.executeQuery("select * from user");//遍历while(resultSet.next()){String username=resultSet.getString("username");response.getWriter().write(username);}} catch (Exception e) {e.printStackTrace();}}/***/protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {}}