学习springboot整合mybatis并编写测试类

遇到的问题：

1.原因是在启动类上只有一个@MapperScan注解。需要配置这个注解的basePackages。

@MapperScan(basePackages = {"com.chenxin.springboot_0702"})

之后删除掉@EnableAutoConfiguration和@ComponentScan(basePackages = {"com.chenxin.springboot_0702"})也照样运行成功。

第二个问题：测试类 里面用@Autowired注解自动装配UserMapper时会有提示报错，但是执行起来没有问题，可以通过。

改成@Resource注解则没有红线了。

首先配置pom.xml文件。springboot的项目都是jar包，不是war包。还有就是依赖模块spring-boot-starter-jdbc不需要，因为在mybatis-spring-boot-starter中已经包含了。

<?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.chenxin</groupId><artifactId>springboot_0702</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>springboot_0702</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.9.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-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!-- Junit依赖 --><!--junit不需要springboot已经自动加载了。-->

　　　　　<!--spring-boot-starter-jdbc已经包含在了mybatis-spring-boot-starter中了。--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.5</version></dependency><!--引入mybatis--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.0</version></dependency><!--mybatis分页插件--><!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper-spring-boot-starter --><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.1.1</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
</project>

application.properties

#配置mysql的连接配置
spring.datasource.url=jdbc:mysql://localhost:3306/testx
spring.datasource.username=root
spring.datasource.password=123
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

接着是model类。

| users | CREATE TABLE `users` (  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,  `username` varchar(45) NOT NULL,  `password` varchar(145) NOT NULL,  `name` varchar(45) DEFAULT NULL,  `courseId` int(11) DEFAULT NULL,  `image` varchar(150) DEFAULT NULL,  `email` varchar(45) DEFAULT NULL,  `address` varchar(45) DEFAULT NULL,  `phone` varchar(45) DEFAULT NULL,  `createdAt` bigint(20) DEFAULT NULL,  `updatedAt` bigint(20) DEFAULT NULL,  PRIMARY KEY (`id`),  UNIQUE KEY `username` (`username`) USING HASH) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8 |

import java.io.Serializable;public class User implements Serializable {private long id;private String userName;private String password;private String name;private int courseId;private String image;private String email;private String address;private String phone;private long createdAt;protected long updatedAt;public User() {}//其他getter和setter　　 //toString方法
}

然后是mapper类。

import com.chenxin.springboot_0702.model.User;
import org.apache.ibatis.annotations.*;
import org.apache.ibatis.mapping.StatementType;import java.util.List;
import java.util.Map;@Mapper
public interface UserMapper {@Select("select * from users")public List<Map> findAll();

}

接着说springboot启动类。最开始提过了在这里只用了springboot整合mybatis和mysql。所以@ComponentScan和@EnableAutoConfiguration。

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;@SpringBootApplication
//开启通用注解扫描
//@ComponentScan(basePackages = {"com.chenxin.springboot_0702"})
@MapperScan(basePackages = {"com.chenxin.springboot_0702"})
//@EnableAutoConfiguration
public class Run {public static void main(String[] args) {SpringApplication.run(Run.class, args);}
}

测试类

import com.chenxin.springboot_0702.dao.UserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import javax.annotation.Resource;@RunWith(SpringRunner.class)
@SpringBootTest(classes = Run.class)
@EnableAutoConfiguration
public class RunTests {@Resourceprivate UserMapper userMapper;@Testpublic void contextLoads() {}@Testpublic void G() {System.out.println(userMapper.findAll());}
}

接下来是其他的增删改查。其中更新使用的@Update注解，貌似可以自动判断是否为空，只要为空就不更新了。

import com.chenxin.springboot_0702.model.User;
import org.apache.ibatis.annotations.*;
import org.apache.ibatis.mapping.StatementType;import java.util.List;
import java.util.Map;@Mapper
public interface UserMapper {//查询@Select("select * from users where id = #{id}")public User findById(@Param("id") long id) throws Exception;@Select("select * from users")public List<User> findAll() throws Exception;@Select("select * from users where phone=#{phone}")public List<User> findByPhone(@Param("phone") String phone) throws Exception;//新增@Insert("INSERT INTO users(id,username,password,name,courseId,image,email,address,phone,createdAt,updatedAt) VALUES (#{id},#{username},#{password},#{name},#{courseId},#{image},#{email},#{address},#{phone},#{createdAt},#{updatedAt})")@Options(useGeneratedKeys = true, keyProperty = "id")public int add(User user) throws Exception;//删除@Delete("delete from users where id = #{id}")public boolean delete(@Param("id") long id) throws Exception;//更新@Update("update users set username=#{username}, password=#{password}, name=#{name}, courseId=#{courseId}, image=#{image}, email=#{email}, address=#{address}, phone=#{phone}, updatedAt=#{updatedAt} where id=#{id}")public boolean update(User user) throws Exception;
}

测试单元

import com.chenxin.springboot_0702.dao.UserMapper;
import com.chenxin.springboot_0702.model.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import javax.annotation.Resource;
import java.util.List;@RunWith(SpringRunner.class)
@SpringBootTest(classes = Run.class)
@EnableAutoConfiguration
public class RunTests {@Resourceprivate UserMapper userMapper;@Testpublic void G() throws Exception {System.out.println(userMapper.findAll());}@Testpublic void g1() throws Exception {System.out.println(userMapper.findById(12L));}@Testpublic void g3() throws Exception {User user = new User();user.setName("无极");user.setUsername("六六qijiu");user.setPassword("12443345");userMapper.add(user);System.out.println(user.getId());}@Test//删除public void g4() throws Exception{long id = 14;System.out.println(userMapper.delete(id));}@Test//更新public void g5() throws Exception{User user = userMapper.findById(16);user.setUsername("七七七");System.out.println(userMapper.update(user));}@Testpublic void g6() throws Exception{List<User> users = userMapper.findByPhone("13101436674");for (User user : users)System.out.println(user.getId() + "***" + user.getPhone());}
}

原文地址：https://www.cnblogs.com/JasonChen92/p/9259629.html

转载于:https://www.cnblogs.com/jpfss/p/11375538.html

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