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SpringBoot教程第6篇:整合mybatis

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 {
    @Autowired
    private 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 { @Autowired AccountService 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

参考资料

mybatis

MyBatis整合

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