快速开始
官方的介绍:https://baomidou.com/guide/quick-start.html
更改数据库的使用,改成mysql
强推B站狂神说:https://space.bilibili.com/95256449
环境配置:
-
mysql8.0+
-
idea 2019
-
jdk 1.8
创建一个maven-quickStart项目
略
创建数据库
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)
);
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');
配置文件
添加依赖:pom.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.1</version>
</dependency>
<!-- mysql 驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- c3p0 数据源 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.5</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
application.yml
## 数据源配置
spring:
datasource: # 数据库的数据配置
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/mybatis_plus?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
username: root
password: 123456
## 显示dao 执⾏sql语句
logging:
level:
com.ppl.mybatisp.mapper: debug # 改成你的dao接口文件所在包路径可以打印出sql语句
进行案例测试:
User.java
@Data
public class User {
private Long id;
private String name;
private Integer age;
private String email;
}
UserMapper.java
public interface UserMapper extends BaseMapper<User> {
}
MybatispApplication.java
@SpringBootApplication
@MapperScan("com.ppl.mybatisp.mapper")
public class MybatispApplication {
public static void main(String[] args) {
SpringApplication.run(MybatispApplication.class, args);
}
}
MybatispApplicationTests.java
@SpringBootTest(classes = {MybatispApplication.class})
@RunWith(SpringRunner.class)
class MybatispApplicationTests {
@Resource
private UserMapper userMapper;
@Test
void contextLoads() {
List<User> users = userMapper.selectList(null);
users.forEach(System.out::println);
}
@Test
void testInsert(){
User user = new User();
user.setAge(10);
user.setEmail("3423423@qq.com");
user.setName("ppl");
userMapper.insert(user);
List<User> users = userMapper.selectList(null);
users.forEach(System.out::println);
}
}