SpringBoot非官方教程 | 第三篇：SpringBoot用JdbcTemplates访问Mysql

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http://blog.csdn.net/forezp/article/details/70477821
本文出自方志朋的博客

本文介绍springboot通过jdbc访问关系型MySQL,通过spring的JdbcTemplate去访问。

准备工作

• jdk 1.8
• maven 3.0
• idea
• mysql

初始化mysql:

-- create table `account`DROP TABLE `account` IF EXISTSCREATE TABLE `account` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `name` varchar(20) NOT NULL,  `money` double DEFAULT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;INSERT INTO `account` VALUES ('1', 'aaa', '1000');INSERT INTO `account` VALUES ('2', 'bbb', '1000');INSERT INTO `account` VALUES ('3', 'ccc', '1000');

创建工程

引入依赖：

在pom文件引入spring-boot-starter-jdbc的依赖：

          <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-jdbc</artifactId>        </dependency>

引入mysql连接类和连接池：

<dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <scope>runtime</scope>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>druid</artifactId>            <version>1.0.29</version>        </dependency>

开启web:

      <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>

配置相关文件

在application.properties文件配置mysql的驱动类，数据库地址，数据库账号、密码信息。

spring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://localhost:3306/testspring.datasource.username=rootspring.datasource.password=123456

通过引入这些依赖和配置一些基本信息，springboot就可以访问数据库类。

具体编码

实体类

public class Account {    private int id ;    private String name ;    private double money;....省略了getter. setter}

dao层

public interface IAccountDAO {    int add(Account account);    int update(Account account);    int delete(int id);    Account findAccountById(int id);    List findAccountList();}

具体的实现类：

package com.forezp.dao.impl;import com.forezp.dao.IAccountDAO;import com.forezp.entity.Account;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.jdbc.core.BeanPropertyRowMapper;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.stereotype.Repository;import java.util.List;/** * Created by fangzhipeng on 2017/4/20. */@Repositorypublic class AccountDaoImpl implements IAccountDAO {    @Autowired    private JdbcTemplate jdbcTemplate;    @Override    public int add(Account account) {        return jdbcTemplate.update("insert into account(name, money) values(?, ?)",              account.getName(),account.getMoney());    }    @Override    public int update(Account account) {        return jdbcTemplate.update("UPDATE  account SET NAME=? ,money=? WHERE id=?",                account.getName(),account.getMoney(),account.getId());    }    @Override    public int delete(int id) {        return jdbcTemplate.update("DELETE from TABLE account where id=?",id);    }    @Override    public Account findAccountById(int id) {        List list = jdbcTemplate.query("select * from account where id = ?", new Object[]{id}, new BeanPropertyRowMapper(Account.class));        if(list!=null && list.size()>0){            Account account = list.get(0);            return account;        }else{            return null;        }    }    @Override    public List findAccountList() {        List list = jdbcTemplate.query("select * from account", new Object[]{}, new BeanPropertyRowMapper(Account.class));        if(list!=null && list.size()>0){            return list;        }else{            return null;        }    }}

service层

public interface IAccountService {    int add(Account account);    int update(Account account);    int delete(int id);    Account findAccountById(int id);    List findAccountList();}

具体实现类：

@Servicepublic class AccountService implements IAccountService {    @Autowired    IAccountDAO accountDAO;    @Override    public int add(Account account) {        return accountDAO.add(account);    }    @Override    public int update(Account account) {        return accountDAO.update(account);    }    @Override    public int delete(int id) {        return accountDAO.delete(id);    }    @Override    public Account findAccountById(int id) {        return accountDAO.findAccountById(id);    }    @Override    public List findAccountList() {        return accountDAO.findAccountList();    }}

构建一组restful api来展示

package com.forezp.web;import com.forezp.entity.Account;import com.forezp.service.IAccountService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.*;import java.util.List;/** * Created by fangzhipeng on 2017/4/20. */@RestController@RequestMapping("/account")public class AccountController {    @Autowired    IAccountService accountService;    @RequestMapping(value = "/list",method = RequestMethod.GET)    public  List getAccounts(){       return accountService.findAccountList();    }    @RequestMapping(value = "/{id}",method = RequestMethod.GET)    public  Account getAccountById(@PathVariable("id") int id){        return accountService.findAccountById(id);    }    @RequestMapping(value = "/{id}",method = RequestMethod.PUT)    public  String updateAccount(@PathVariable("id")int id , @RequestParam(value = "name",required = true)String name,    @RequestParam(value = "money" ,required = true)double money){        Account account=new Account();        account.setMoney(money);        account.setName(name);        account.setId(id);        int t=accountService.update(account);        if(t==1){            return account.toString();        }else {            return "fail";        }    }    @RequestMapping(value = "",method = RequestMethod.POST)    public  String postAccount( @RequestParam(value = "name")String name,                                 @RequestParam(value = "money" )double money){        Account account=new Account();        account.setMoney(money);        account.setName(name);        int t= accountService.add(account);        if(t==1){            return account.toString();        }else {            return "fail";        }    }}

可以通过postman来测试，具体的我已经全部测试通过，没有任何问题。注意restful构建api的风格。

源码下载：https://github.com/forezp/SpringBootLearning

参考资料

relational-data-access