Mybatis插件之Mybatis-Plus（SpringBoot）

这边只在SpringBoot下进行简单查询的测试，接下来会博客会介绍增删改的操作。

数据库表结构如下：

开始测试：

1、新建工程（trymp_springboot）并把项目结构建立好

2、导入pom.xml的依赖

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
    </parent>
    <dependencies>
        <!--测试的依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!--mysql驱动包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.0</version>
        </dependency>
        <!--日志依赖-->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
        </dependency>
        <!--Druid数据源-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.20</version>
        </dependency>
    </dependencies>

3、日志文件（log4j.properties）配置如下：

log4j.rootLogger=DEBUG,A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.Al.layout.ConversionPattern=[%t] [%c]-[%p]  %m%n

4、SpringBoot核心配置文件（application.yml），如下：

server:
  port: 8080
spring:
  datasource:
    druid:
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql:///chw?CharacterEncoding=utf8
      username: root
      password: root

5、Mapper接口内容如下：

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.jieku.pojo.User;

public interface UserMapper extends BaseMapper<User> {
}

6、实体类内容如下：

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
@TableName("tb_user")
public class User {
    @TableId(type = IdType.AUTO) // 需要指定，否则无法新增后拿到回调的id，以及进行删除等操作
    private Integer uid;
    private String uname;
    private Integer age;

    public User(String uname, Integer age) {
        this.uname = uname;
        this.age = age;
    }
}

7、启动类内容如下：

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

@SpringBootApplication
@MapperScan("com.jieku.mapper") // 设置mapper接口的扫描路径
public class MPApplication {
    public static void main(String[] args) {
        SpringApplication.run(MPApplication.class);
    }
}

8、测试类内容如下：

import com.jieku.mapper.UserMapper;
import com.jieku.pojo.User;
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.SpringJUnit4ClassRunner;

import java.util.List;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest // SpringBoot的测试
public class TestMPSpringboot {
    @Autowired
    private UserMapper userMapper;

    @Test
    public void test01(){
        // 1.进行查询
        List<User> users = userMapper.selectList(null);
        // 2.遍历打印输出
        for (User user : users) {
            System.out.println(user);
        }
    }
}

9、运行结果如下：

至此，简单查询测试结束！