本文主要讲解如何在springboot下整合mybatis，并访问数据库。由于mybatis这个框架太过于流行，所以我就不讲解了。

引入依赖

在pom文件引入mybatis-spring-boot-starter的依赖：

       <dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter<artifactId><version>1.3.0</version></dependency>

引入数据库连接依赖：

<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>

引入数据源

application.properties配置文件中引入数据源：

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

这样，springboot就可以访问数据了。

创建数据库表

建表语句：

-- 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');

具体实现

这篇文篇通过注解的形式实现。

创建实体：

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

dao层

@Mapper
public interface AccountMapper {@Insert("insert into account(name, money) values(#{name}, #{money})")int add(@Param("name") String name, @Param("money") double money);@Update("update account set name = #{name}, money = #{money} where id = #{id}")int update(@Param("name") String name, @Param("money") double money, @Param("id") int  id);@Delete("delete from account where id = #{id}")int delete(int id);@Select("select id, name as name, money as money from account where id = #{id}")Account findAccount(@Param("id") int id);@Select("select id, name as name, money as money from account")List<Account> findAccountList();
}

service层

@Service
public class AccountService {@Autowiredprivate AccountMapper accountMapper;public int add(String name, double money) {return accountMapper.add(name, money);}public int update(String name, double money, int id) {return accountMapper.update(name, money, id);}public int delete(int id) {return accountMapper.delete(id);}public Account findAccount(int id) {return accountMapper.findAccount(id);}public List<Account> findAccountList() {return accountMapper.findAccountList();}
}

controller层，构建restful API

package com.forezp.web;import com.forezp.entity.Account;
import com.forezp.service.AccountService;
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 {@AutowiredAccountService 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.findAccount(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) {int t= accountService.update(name,money,id);if(t==1) {return "success";}else {return "fail";}}@RequestMapping(value = "/{id}", method = RequestMethod.DELETE)public String delete(@PathVariable(value = "id")int id) {int t= accountService.delete(id);if(t==1) {return "success";}else {return "fail";}}@RequestMapping(value = "", method = RequestMethod.POST)public String postAccount(@RequestParam(value = "name") String name,@RequestParam(value = "money") double money) {int t= accountService.add(name,money);if(t==1) {return "success";}else {return "fail";}}}

通过postman测试通过。

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