SpringBoot | 第三十章：SpringBoot集成Mybatis注解配置详解

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：

       
			org.mybatis.spring.boot
			mybatis-spring-boot-starter
			1.3.0
		

引入数据库连接依赖：

			mysql
			mysql-connector-java
			runtime
		
		
			com.alibaba
			druid
			1.0.29
		

 完整的pom依赖

 
        org.springframework.boot
        spring-boot-starter-parent
        2.1.3.RELEASE
         
    
    com.thinkingcao
    springboot-mybatis
    0.0.1-SNAPSHOT
    springboot-mybatis
    Demo project for Spring Boot

    
        UTF-8
        UTF-8
        1.8
    

    
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.0
        
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            mysql
            mysql-connector-java
            runtime
        
        
            com.alibaba
            druid
            1.0.29
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.projectlombok
            lombok
            true
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

引入数据源

application.yml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

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test
    data-username: root
    data-password: 123456
    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：

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.ToString;

/**
 * 
 *
 * @auther: cao_wencao
 * @date: 2019/2/20 13:34
 * 
 */
@Data
@ToString
@AllArgsConstructor
public class Account {
    private int id ;
    private String name ;
    private double money;


}

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 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 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;

/**
 * 
 *
 * @auther: cao_wencao
 * @date: 2019/2/20 13:39
 * 
 */
@RestController
@RequestMapping("/account")
public class AccountController {

    @Autowired
    AccountService 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.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。

 

参考资料

mybatis

mybatis整合

Spring Boot教程第6篇：整合mybatis