springboot + mybatis-plus hello world 简单实例

sql

DROP TABLE IF EXISTS USER;

CREATE TABLE USER
(
	id BIGINT(20) NOT NULL COMMENT 主键ID,
	NAME VARCHAR(30) NULL DEFAULT NULL COMMENT 姓名,
	age INT(11) NULL DEFAULT NULL COMMENT 年龄,
	email VARCHAR(50) NULL DEFAULT NULL COMMENT 邮箱,
	PRIMARY KEY (id)
);

DELETE FROM USER;

INSERT INTO USER (id, NAME, age, email) VALUES
(1, Jone, 18, test1@baomidou.com),
(2, Jack, 20, test2@baomidou.com),
(3, Tom, 28, test3@baomidou.com),
(4, Sandy, 21, test4@baomidou.com),
(5, Billie, 24, test5@baomidou.com);

pom.xml

<?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 https://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>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <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.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.2.0</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

application.properties

server.port=8765
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://i8-mysql:3306/i8_db
spring.datasource.username=root
spring.datasource.password=12345

User.java

/**
 * @author LDC
 */
@Data
public class User extends Model<User> {
          
   
    private Long id;
    private String name;
    private Integer age;
    private String email;

    @Override
    protected Serializable pkVal() {
          
   
        return id;
    }
}

UserMapper.java

/**
 * @author LDC
 */
public interface UserMapper extends BaseMapper<User> {
          
   

}

DemoApplicationTests.java

@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {
          
   

    @Test
    public void testSelect() {
          
   
        User user=new User();
        List<User> userlist = user.selectAll();
        userlist.forEach(System.out::println);
    }

}