mybatis plus在spring boot中的使用

pom配置：

<?xml version="1.0" encoding="UTF-8"?>
<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>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
    </parent>

    <groupId>xx.flower</groupId>
    <artifactId>my_boot</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.1.2</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.2</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.8.0-beta4</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.15</version>
        </dependency>
    </dependencies>
</project>

说明：由于使用的是SpringBootTest进行测试，而SpringBootTest需要使用junit5以上，spring boot2.2.X以上版本才支持junit5，所以该spring-boot-starter-parent版本使用2.2.0.RELEASE，并且需要依赖：

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-test</artifactId>
</dependency>

spring boot的application.yml配置如下：

server:
  port: 8088

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test_xx?useUnicode=true&characterEncoding=UTF-8
    username: root
    password: root

mybatis-plus:
  type-aliases-package: xx.flower.test.*.mapper
  mapper-locations: classpath:mapper/test/*.xml
  global-config:
    banner: false
  configuration:
    jdbc-type-for-null: null

代码编写：

启动springboot的代码：

package xx.flower.test;


import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;

@SpringBootApplication(scanBasePackages="xx.flower")
@MapperScan({"xx.flower.*.mapper"})
public class MyApplication {

    public static void main(String[] args){
       new SpringApplicationBuilder(MyApplication.class).run(args);
    }
}

SpringBootTest的测试代码：

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import xx.flower.test.MyApplication;
import xx.flower.test.entity.Info;
import xx.flower.test.mapper.InfoMapper;

import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = MyApplication.class)
public class MybatisTest {

    @Autowired
    private InfoMapper infoMapper;

    @Test
    public void testSelect(){
        System.out.println("-------------");
        List<Info> list = infoMapper.selectList(null);
        list.forEach(System.out::println);
    }
}

说明：@SpringBootTest(classes = *)中的classes需要指定到：spring boot的启动类上，如果不指定则提示找不到自动注入类。

结果展示：

运行结果展示