（二）springboot+mybatis plus快速構建專案
阿新 • • 發佈：2018-12-12
註明：我將通過一個Demo來闡述MyBatis-Plus的強大
我的環境
- JDK1.8
- maven3.5.4
- 開發工具idea
- springboot2.0.5
- mybatis-plus3.0.3
- mysql5.7
上面是我的環境版本。
對應的資料庫指令碼
CREATE TABLE user ( id BIGINT(20) NOT NULL COMMENT '主鍵ID', name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名', age INT(11) NULL DEFAULT NULL COMMENT '年齡', email VARCHAR(50) NULL DEFAULT NULL COMMENT '郵箱', PRIMARY KEY (id) );
資料庫data指令碼
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]');
資料庫準備完成後我們來通過springboot建立初始化一個工程。初始化工程的步驟我就不闡述了，有不知道的小夥伴自行baidu
pom.xml展示
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.lqf</groupId> <artifactId>springboot-mybatis-plus</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot-mybatis-plus</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.5.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <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> </dependency> <!--web--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!--lombok用來簡化實體類--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <!--mybatis-plus--> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.0.3</version> </dependency> <!--mysql--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
注意
引入 MyBatis-Plus 之後請不要再次引入 MyBatis 以及 MyBatis-Spring，以避免因版本差異導致的問題。
如果springboot版本是SNAPSHOT快照版還需要新增倉庫
<repository>
<id>snapshots</id>
<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: ****
資料庫連線換成自己的就可以
在 Spring Boot 啟動類中新增 @MapperScan 註解，掃描 Mapper 資料夾
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);
}
}
@MapperScan()內容填寫你自己的mapper位置
對應資料庫實體類編寫
@Data
public class User {
private Long id;
private String name;
private Integer age;
private String email;
}
@Data註解會給此類預設提供Getter,Setter,equals,hashCode,toString方法
編寫Mapper類 UserMapper.java
public interface UserMapper extends BaseMapper<User> {
}
測試類
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);
}
}
測試結果
----- 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])
到這裡一個簡單的springboot+mybatis-plus就整合完成了，你會發現沒有寫mapper.xml，mapper.java中什麼也沒有。對的你沒看錯，這只是mybatis-plus的冰山一角，讓我們看他後續的強大功能吧