[Java知识库] Mybatis-Plus

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[Java知识库]Mybatis-Plus

mybatisPlus就是mybatis的一个增强工具，在不影响原mybatis功能的情况下，提供更多高效的功能来帮助使用mybatis。

一：使用

springboot+mybatis:

创建springboot工程，导入依赖：

pom.xml

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--简化代码的?具包-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!--mybatis-plus的springboot?持-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.1</version>
        </dependency>
        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
        </dependency>
</dependencies>
<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
</build>

application.properties

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mp?
useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true&useSSL
=false
spring.datasource.username=root
spring.datasource.password=root

pojo

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
     private Long id;
     private String name;
     private Integer age;
     private String email; 
}

mapper

之前介绍过，mybatis中有个mapper插件，这里使用mybatis-plus后，使用BaseMapper即可。

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


public interface UserMapper extends BaseMapper<User> {
}

启动类

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

@MapperScan("com.lagou.mp.mapper") 
@SpringBootApplication
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

?测试类

import com.lagou.mp.mapper.UserMapper;
import com.lagou.mp.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.SpringRunner;
import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMapperTest {
 @Autowired
 private UserMapper userMapper;
 @Test
 public void testSelect() {
     List<User> userList = userMapper.selectList(null);
     for (User user : userList) {
         System.out.println(user);
       }
   }
}

?BaseMapper有很多基本方法：