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第三篇：SpringBoot用JdbcTemplates访问Mysql

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12/02
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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 EXISTS

CREATE 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.Driver

spring.datasource.url=jdbc:mysql://localhost:3306/test

spring.datasource.username=root

spring.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<Account> 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.

 */

@Repository

public 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<Account> 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<Account> findAccountList() {

        List<Account> 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<Account> findAccountList();

}

具体实现类： 

@Service

public 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<Account> 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<Account> 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";

        }

    }

}

完整代码：http://pan.baidu.com/s/1nuPQC8x

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