（二）springboot+mybatis plus快速构建项目
（二）springboot+mybatis plus快速构建项目
注明：我将通过一个Demo来阐述MyBatis-Plus的强大
我的环境
- JDK1.8
- maven3.5.4
- 开发工具idea
- springboot2.0.5
- mybatis-plus3.0.3
- mysql5.7
上面是我的环境版本。
源码下载地址
对应的数据库脚本
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)
);
数据库data脚本
INSERT INTO user (id, name, age, email) VALUES
(1, 'Jone', 18, '[email protected]'),
(2, 'Jack', 20, '[email protected]'),
(3, 'Tom', 28, '[email protected]'),
(4, 'Sandy', 21, '[email protected]'),
(5, 'Billie', 24, '[email protected]');
数据库准备完成后我们来通过springboot创建初始化一个工程。初始化工程的步骤我就不阐述了，有不知道的小伙伴自行baidu
pom.xml展示
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<groupId>com.lqfgroupId>
<artifactId>springboot-mybatis-plusartifactId>
<version>0.0.1-SNAPSHOTversion>
<packaging>jarpackaging>
<name>springboot-mybatis-plusname>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>2.0.5.RELEASEversion>
<relativePath/>
parent>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<java.version>1.8java.version>
properties>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starterartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<optional>trueoptional>
dependency>
<dependency>
<groupId>com.baomidougroupId>
<artifactId>mybatis-plus-boot-starterartifactId>
<version>3.0.3version>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-jdbcartifactId>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<scope>runtimescope>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
plugins>
build>
project>
注意
引入 MyBatis-Plus 之后请不要再次引入 MyBatis 以及 MyBatis-Spring，以避免因版本差异导致的问题。
如果springboot版本是SNAPSHOT快照版还需要添加仓库
<repository>
<id>snapshotsid>
<url>https://oss.sonatype.org/content/repositories/snapshots/url>
repository>
applicaiton.yml配置
# DataSource Config
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://******:3306/crm
username: ****
password: ****
数据库连接换成自己的就可以
在 Spring Boot 启动类中添加 @MapperScan 注解，扫描 Mapper 文件夹
@MapperScan()内容填写你自己的mapper位置
package com.lqf.springbootmybatisplus;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.lqf.springbootmybatisplus.dao.mapper")
public class SpringbootMybatisPlusApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootMybatisPlusApplication.class, args);
}
}
对应数据库实体类编写
@Data注解会给此类默认提供Getter,Setter,equals,hashCode,toString方法
@Data
public class User {
private Long id;
private String name;
private Integer age;
private String email;
}
编写Mapper类 UserMapper.java
public interface UserMapper extends BaseMapper<User> {
}
测试类
package com.lqf.springbootmybatisplus;
import com.lqf.springbootmybatisplus.dao.mapper.UserMapper;
import com.lqf.springbootmybatisplus.domain.entity.User;
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 SpringbootMybatisPlusApplicationTests {
@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);
}
}
测试结果
----- selectAll method test ------
User(id=1, name=Jone, age=18, [email protected])
User(id=2, name=Jack, age=20, [email protected])
User(id=3, name=Tom, age=28, [email protected])
User(id=4, name=Sandy, age=21, [email protected])
User(id=5, name=Billie, age=24, [email protected])
到这里一个简单的springboot+mybatis-plus就整合完成了，你会发现没有写mapper.xml，mapper.java中什么也没有。对的你没看错，这只是mybatis-plus的冰山一角，让我们看他后续的强大功能吧
转自：https://blog.csdn.net/m0_37034294/article/details/82892981