学习springboot整合mybatis并编写测试类

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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 {
    @Resource
    private UserMapper userMapper;    @Test
    public void contextLoads() {
    }    @Test
    public 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 {    @Resource
    private UserMapper userMapper;    @Test
    public void G() throws Exception {
        System.out.println(userMapper.findAll());
    }
    @Test
    public void g1() throws Exception {
        System.out.println(userMapper.findById(12L));
    }
    @Test
    public 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));
    }
    @Test
    public void g6() throws Exception{
        List<User> users = userMapper.findByPhone("13101436674");
        for (User user : users)
            System.out.println(user.getId() + "***" + user.getPhone());
    }
}