使用jdbcTemplate

原理是把加載驅動Class.forName("com.mysql.jdbc.Driver");

和連接數據庫Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/sw_database?user=root&password=root");

用一個對象完成DriverManagerDataSource dataSource=new DriverManagerDataSource();

package com.swift;

import org.springframework.jdbc.core.JdbcTemplate;
 
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.stereotype.Component;
@Component(value="jdbcTemplateDemo")
public class JdbcTemplateDemo {
    public boolean add() {
        //設置數據庫信息
        DriverManagerDataSource dataSource=new DriverManagerDataSource();
        dataSource.setDriverClassName(
 
"com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/sw_database");
        dataSource.setUsername("root");
        dataSource.setPassword("root");
        
        //創建JdbcTemplate對象，設置數據源
        JdbcTemplate jdbcTemplate=new JdbcTemplate(dataSource);
        String sql="insert into sw_user(username,password) values(?,?)";
        
 
int count=jdbcTemplate.update(sql, "doomsday","20171125");
        if(count==1) {
            return true;
        }
        return false;
    }
}

添加數據庫操作使用JdbcTemplate對象根據數據源直接使用update方法完成，比之前簡便很多。

之前完成需按下邊方法：

PreparedStatement ps=conn.prepareStatement("insert into sw_user(username,password) values(?,?)");

ps.setString(1,“doomsday”);

ps.setString(2, “20171125”);

//ResultSet rs=ps.executeQuery();(不是這句，這句是select 語句的)

int count=ps.executeUpdate();

if(count==1) {return true;}

上邊代碼使用Spring框架註解生成對象方法

xml配置文件代碼如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> 
      <!--  開啟註解掃描  -->
     <context:component-scan base-package="com.swift"></context:component-scan>
     
</beans>

使用Servlet類進行測試：

package com.swift;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
@WebServlet("/ServletTest")
public class ServletTest extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public ServletTest() {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        response.getWriter().append("Served at: ").append(request.getContextPath());
        ApplicationContext context=new ClassPathXmlApplicationContext("beanZhujie.xml");
        JdbcTemplateDemo jdbcTemplateDemo=(JdbcTemplateDemo) context.getBean("jdbcTemplateDemo");
        if(jdbcTemplateDemo.add()) {
            response.getWriter().append("帳號註冊成功");
        }else {
            response.getWriter().append("註冊失敗");
        }
        
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}

瀏覽器中的到結果如下：

navicat premium 中成功添加數據，結果如下：

Spring框架針對dao層的jdbcTemplate操作crud之add添加數據庫操作