Spring学习笔记：jdbcTemplate和数据源配置

一、使用Spring框架jdbcTemplate实现数据库的增删改查

　　1.数据库

/*
SQLyog Ultimate v8.32
MySQL - 5.7.19-log : Database - infosm
*********************************************************************
*/

/*!40101 SET NAMES utf8 */;

/*!40101 SET SQL_MODE=''*/;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
CREATE DATABASE /*!32312 IF NOT EXISTS*/`infosm` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `infosm`;

/*Table structure for table `infosm_news` */

DROP TABLE IF EXISTS `infosm_news`;

CREATE TABLE `infosm_news` (
  `newsid` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '咨询ID',
  `newstitle` varchar(50) DEFAULT NULL COMMENT '咨询标题',
  `newscontent` varchar(1000) DEFAULT NULL COMMENT '资讯内容',
  `clickcount` bigint(20) DEFAULT NULL COMMENT '点击数',
  PRIMARY KEY (`newsid`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8 COMMENT='新闻资讯表';

/*Data for the table `infosm_news` */

insert  into `infosm_news`(`newsid`,`newstitle`,`newscontent`,`clickcount`) values (1,'大家一起来学JAVA吧','JAVA是不可或缺的程序语言',9),(2,'好好学习','天天向上',3),(3,'我最喜欢的歌曲','黯然销魂',2),(4,'哈哈哈','色调风格的',0),(5,'谁狗带','电饭锅',NULL);

/*Table structure for table `infosm_talk` */

DROP TABLE IF EXISTS `infosm_talk`;

CREATE TABLE `infosm_talk` (
  `tid` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '评论编号',
  `content` varchar(200) DEFAULT NULL COMMENT '评论内容',
  `talktime` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '评论时间',
  `nid` bigint(20) DEFAULT NULL COMMENT '咨询ID',
  PRIMARY KEY (`tid`)
) ENGINE=InnoDB AUTO_INCREMENT=35 DEFAULT CHARSET=utf8 COMMENT='评论表';

/*Data for the table `infosm_talk` */

insert  into `infosm_talk`(`tid`,`content`,`talktime`,`nid`) values (1,'很不错，我想学','2017-09-26 12:54:15',1),(2,'大家一起来学吧','2017-09-26 12:54:37',1),(3,'今天考试','2017-09-26 16:15:12',2),(4,'天气很不错哦','2017-09-26 16:15:36',1),(5,'哈哈哈','2017-09-26 17:01:24',2),(6,'国庆节放假啦','2017-09-29 12:08:22',3),(7,'中秋节放假啦','2017-09-29 12:38:58',3),(8,'中秋节放假啦','2017-09-29 13:56:21',3),(9,'中秋节放假啦','2017-09-29 13:56:22',3),(10,'中秋节放假啦','2017-09-29 13:56:23',3),(11,'中秋节放假啦','2017-09-29 13:56:23',3),(12,'中秋节放假啦','2017-09-29 13:56:23',3),(13,'中秋节放假啦','2017-09-29 13:56:23',3),(14,'中秋节放假啦','2017-09-29 13:56:23',3),(15,'中秋节放假啦','2017-09-29 13:56:24',3),(16,'中秋节放假啦','2017-09-29 13:56:39',1),(17,'中秋节放假啦','2017-09-29 13:56:40',1),(18,'中秋节放假啦','2017-09-29 13:56:40',1),(19,'中秋节放假啦','2017-09-29 13:56:40',1),(20,'中秋节放假啦','2017-09-29 13:56:40',1),(21,'中秋节放假啦','2017-09-29 13:56:40',1),(22,'中秋节放假啦','2017-09-29 13:56:40',1),(23,'中秋节放假啦','2017-09-29 13:56:41',1),(24,'中秋节放假啦','2017-09-29 13:56:41',1),(25,'中秋节放假啦','2017-09-29 13:56:41',1),(26,'中秋节放假啦','2017-09-29 13:56:50',5),(27,'中秋节放假啦','2017-09-29 13:56:50',5),(28,'中秋节放假啦','2017-09-29 13:56:51',5),(29,'中秋节放假啦','2017-09-29 13:56:51',5),(30,'中秋节放假啦','2017-09-29 13:56:51',5),(31,'中秋节放假啦','2017-09-29 13:56:57',4),(32,'中秋节放假啦','2017-09-29 13:56:57',4),(33,'中秋节放假啦','2017-09-29 13:56:57',4),(34,'中秋节放假啦','2017-09-29 13:56:57',4);

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

　　2.使用maven导入相关Jar包

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.3</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.43</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.18</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/c3p0/c3p0 -->
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/commons-dbcp/commons-dbcp -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

    </dependencies>

　　3.项目框架结构

　　4.接口和类的代码

　　　　bean：

public class News {
    private Integer newsid;
    private String newstitle;
    private String newscontent;
    private Integer clickcount;

    public Integer getNewsid() {
        return newsid;
    }

    public void setNewsid(Integer newsid) {
        this.newsid = newsid;
    }

    public String getNewstitle() {
        return newstitle;
    }

    public void setNewstitle(String newstitle) {
        this.newstitle = newstitle;
    }

    public String getNewscontent() {
        return newscontent;
    }

    public void setNewscontent(String newscontent) {
        this.newscontent = newscontent;
    }

    public Integer getClickcount() {
        return clickcount;
    }

    public void setClickcount(Integer clickcount) {
        this.clickcount = clickcount;
    }
}

import java.util.Date;

public class Talk {
    private Integer tid;
    private String content;
    private Date talktime;
    private Integer nid;

    public Integer getTid() {
        return tid;
    }

    public void setTid(Integer tid) {
        this.tid = tid;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public Date getTalktime() {
        return talktime;
    }

    public void setTalktime(Date talktime) {
        this.talktime = talktime;
    }

    public Integer getNid() {
        return nid;
    }

    public void setNid(Integer nid) {
        this.nid = nid;
    }
}

　　　　dao：

import java.util.List;

public interface INewsDao {
    public List<News> findAll();
}

import cn.infosm.bean.News;
import cn.infosm.dao.INewsDao;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

public class NewsDaoImpl extends JdbcDaoSupport implements INewsDao {
    @Override
    public List<News> findAll() {
        String sql = "SELECT * FROM infosm_news";
        List<News> list = getJdbcTemplate().query(sql, new RowMapper<News>() {
            @Override
            public News mapRow(ResultSet rs, int rowNum) throws SQLException {
                News news = new News();
                news.setNewsid(rs.getInt("newsid"));
                news.setNewstitle(rs.getString("newstitle"));
                news.setNewscontent(rs.getString("newscontent"));
                news.setClickcount(rs.getInt("clickcount"));
                return news;
            }
        });
        return list;
    }
}

　　　　service：

import java.util.List;

public interface INewsService {
    public List<News> findAll();
}

import java.util.List;

public class NewsServiceImpl implements INewsService {
    private INewsDao dao;

    public INewsDao getDao() {
        return dao;
    }

    public void setDao(INewsDao dao) {
        this.dao = dao;
    }

    @Override
    public List<News> findAll() {
        return dao.findAll();
    }
}

　　　　applicationContext.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--通过bean元素生命需要Spring创建的实例。该实例的类型通过class属性指定，
    并通过id属性为该实例制定一个名称，以便于访问-->
    <!--DataSource jdbc-->
    <bean id="dateSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql:///infosm"/>
        <property name="username" value="root"/>
        <property name="password" value="tengyu"/>
    </bean>
    <!--jdbcTemplate-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dateSource"/>
    </bean>
    <!--newsDao-->
    <bean id="newsDao" class="cn.infosm.dao.impl.NewsDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"/>
    </bean>
    <!--newsService-->
    <bean id="newsService" class="cn.infosm.service.impl.NewsServiceImpl">
        <property name="dao" ref="newsDao"/>
    </bean>
    <!--talkDao-->
    <bean id="talkDao" class="cn.infosm.dao.impl.TalkDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"/>
    </bean>
    <!--talkService-->
    <bean id="talkService" class="cn.infosm.service.impl.TalkServiceImpl">
        <property name="dao" ref="talkDao"/>
    </bean>
</beans>

　　　　测试类：

import java.util.List;

public class NewsMapperTest {
    @Test
    public void findAllNews(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        INewsService newsService = (INewsService) context.getBean("newsService");
        List<News> list = newsService.findAll();
        for (News news :list) {
            System.out.println(news.getNewstitle());
        }

    }

    @Test
    public void findAllTalks(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        ITalkService talkService = (ITalkService) context.getBean("talkService");
        List<Talk> list = talkService.findAll();
        for (Talk talk :list) {
            System.out.println(talk.getTid()+talk.getContent()+talk.getTalktime());
        }

    }
}

二、修改数据源，多种数据源配置方法（applicationContext.xml中替换jdbc数据源）

　　1、dbcp数据源

<!--DataSource dbcp-->
    <!--<bean id="dateSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql:///infosm"/>
        <property name="username" value="root"/>
        <property name="password" value="tengyu"/>
    </bean>-->

　　2、c3p0数据源

<!--DataSource c3p0-->
    <!--<bean id="dateSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql:///infosm"/>
        <property name="user" value="root"/>
        <property name="password" value="tengyu"/>
    </bean>-->

　　3、druid数据源（alibaba）

<!--DataSource druid-->
<!--<bean id="dateSource" class="com.alibaba.druid.pool.DruidDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql:///infosm"/>
    <property name="username" value="root"/>
    <property name="password" value="tengyu"/>
</bean>-->

三、修改数据源时需要引入相应的架包（注意）

　　maven引入依赖