Spring Boot2.0之整合Mybatis

我在写这个教程时候，踩了个坑，一下子折腾到了凌晨两点半。

坑： Spring Boot对于Mysql8.1的驱动支持不好啊

我本地安装的是Mysql8.1版本，在开发时候。pom提示不需要输入驱动版本（因为Spring Boot会自动匹配），毛啊。根本就没有匹配成功。然后我尝试了各种办法。没有解决。

最后安装的mysql5.6版本轻松搞定

废话不多说了，赶紧写完，睡觉觉。

1、创建maven工程，pom：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>jdbcTemplate</groupId>
  <artifactId>com.toov5.jdbc</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.2.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
                
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.20</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>

</project>

2、application.properties:

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

3、User类代码：

　　

package com.toov5.entity;

import lombok.Data;

@Data  
public class User {
  private Integer age;
  private String name;
  private  Integer id;
    
}

用了lombok插件

4、Mapper代码：

package com.toov5.mapper;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import com.toov5.entity.User;


public interface UserMapper {
    
        @Select("SELECT * FROM USERS WHERE NAME = #{name}")
        User findByName(@Param("name") String name);
        @Insert("INSERT INTO USERS(NAME, AGE) VALUES(#{name}, #{age})")
        int insert(@Param("name") String name, @Param("age") Integer age);

}

这里没有用到 @Mapper注解哦 因为启动类里面有个好东西代替了！请接着往下读

5、service代码

package com.toov5.service;



import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.toov5.mapper.UserMapper;

import lombok.extern.slf4j.Slf4j;

@Service
@Slf4j
public class UserService {
  @Autowired
  private UserMapper userMapper;
  
  public int insertUser(String name, Integer age){
     int result = userMapper.insert(name, age);
      log.info("####################",result);
      return result;
  }
}

6、Controller代码：

package com.toov5.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.toov5.service.UserService;

@RestController
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/insertUser")  
  public Integer insertUser(String name, Integer age){
     return userService.insertUser(name, age);
     
     }
     
}

7、启动类

package com.toov5.app;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@ComponentScan(basePackages="com.toov5")
@MapperScan(basePackages="com.toov5.mapper") 
@SpringBootApplication
public class app {
  public static void main(String[] args){
      SpringApplication.run(app.class, args);
  }
}

这里重点说下：

这个注解，省去了mapper层类的@Mapper注解

整个项目目录结构：

访问：

 查看数据库：

都成功了~~ 是不是很好玩呀