快速入门
创建数据库
-
创建一个数据库db1
create database db1
-
创建一个user表
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) );
-
插入数据
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.c om‘);
编写主体类
-
初始化工程(pom文件)
<?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>2.5.2</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>MyApplication</artifactId> <version>0.0.1-SNAPSHOT</version> <name>MyApplication</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <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>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.3.0</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.38</version> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <scope>test</scope> </dependency> </dependencies> </project>
-
application
spring: datasource: username: root password: 123456 url: jdbc:mysql://localhost:3306/db1?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC driver-class-name: com.mysql.jdbc.Driver
-
User
package com.blue.bean; import lombok.Data; @Data public class User { private Long id; private String name; private Integer age; private String email; }
-
UserMapper
package com.blue.mapper; import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.blue.bean.User; public interface UserMapper extends BaseMapper<User> { }
-
MyApplication
package com.blue; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication @MapperScan("com.blue.mapper") public class MyApplication { public static void main(String[] args) { SpringApplication.run(MyApplication.class, args); } }
编写测试类
-
MyApplicationTests
package com.blue; import com.blue.bean.User; import com.blue.mapper.UserMapper; import org.junit.Assert; 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 MyApplicationTests { @Autowired private UserMapper userMapper; @Test public void testSelect() { System.out.println(("----- selectAll method test ------")); List<User> userList = userMapper.selectList(null); Assert.assertEquals(5, userList.size()); userList.forEach(System.out::println); } }
实验结果
- 控制台输出