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。

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<?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> 
&lt;groupId&gt;com.chenxin&lt;/groupId&gt; 
&lt;artifactId&gt;springboot_0702&lt;/artifactId&gt; 
&lt;version&gt;0.0.1-SNAPSHOT&lt;/version&gt; 
&lt;packaging&gt;jar&lt;/packaging&gt; 
 
&lt;name&gt;springboot_0702&lt;/name&gt; 
&lt;description&gt;Demo project <span style="color: #0000ff;">for</span> Spring Boot&lt;/description&gt; 
 
&lt;parent&gt; 
    &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt; 
    &lt;artifactId&gt;spring-boot-starter-parent&lt;/artifactId&gt; 
    &lt;version&gt;1.5.9.RELEASE&lt;/version&gt; 
    &lt;relativePath/&gt; &lt;!-- lookup parent from repository --&gt; 
&lt;/parent&gt; 
 
&lt;properties&gt; 
    &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt; 
    &lt;project.reporting.outputEncoding&gt;UTF-8&lt;/project.reporting.outputEncoding&gt; 
    &lt;java.version&gt;1.8&lt;/java.version&gt; 
&lt;/properties&gt; 
 
&lt;dependencies&gt; 
    &lt;dependency&gt; 
        &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt; 
        &lt;artifactId&gt;spring-boot-starter-web&lt;/artifactId&gt; 
    &lt;/dependency&gt; 
 
    &lt;dependency&gt; 
        &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt; 
        &lt;artifactId&gt;spring-boot-starter-thymeleaf&lt;/artifactId&gt; 
    &lt;/dependency&gt; 
 
    &lt;dependency&gt; 
        &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt; 
        &lt;artifactId&gt;spring-boot-starter-test&lt;/artifactId&gt; 
        &lt;scope&gt;test&lt;/scope&gt; 
    &lt;/dependency&gt; 
    &lt;!-- Junit依赖 --&gt; 
    <span style="color: #808080; font-style: italic;">&lt;!--junit<span style="color: #808080; font-style: italic; font-family: '宋体';">不需要<span style="color: #808080; font-style: italic;">springboot<span style="color: #808080; font-style: italic; font-family: '宋体';">已经自动加载了。<span style="color: #808080; font-style: italic;">--&gt;<br></span></span></span></span></span></pre> 
     <!--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>
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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。

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| 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;
</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> User() { 
} 
</span><span style="color: #008000;">//</span><span style="color: #008000;">其他getter和setter<br>   //toString方法</span> 

}

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然后是mapper类。

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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(</span>"select * from users"<span style="color: #000000;">) 
</span><span style="color: #0000ff;">public</span> List&lt;Map&gt;<span style="color: #000000;"> findAll(); 


}

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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。

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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 {

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">static</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> main(String[] args) { 
    SpringApplication.run(Run.</span><span style="color: #0000ff;">class</span><span style="color: #000000;">, args); 
} 

}

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 测试类

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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 
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> contextLoads() { 
} 
 
 
@Test 
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> G() { 
    System.out.println(userMapper.findAll()); 
} 

}

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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。

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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 {

</span><span style="color: #008000;">//</span><span style="color: #008000;">查询</span> 
@Select("select * from users where id = #{id}"<span style="color: #000000;">) 
</span><span style="color: #0000ff;">public</span> User findById(@Param("id") <span style="color: #0000ff;">long</span> id) <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception; 
 
@Select(</span>"select * from users"<span style="color: #000000;">) 
</span><span style="color: #0000ff;">public</span> List&lt;User&gt; findAll() <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception; 
 
@Select(</span>"select * from users where phone=#{phone}"<span style="color: #000000;">) 
</span><span style="color: #0000ff;">public</span> List&lt;User&gt; findByPhone(@Param("phone") String phone) <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception; 
 
</span><span style="color: #008000;">//</span><span style="color: #008000;">新增</span> 
@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})"<span style="color: #000000;">) 
@Options(useGeneratedKeys </span>= <span style="color: #0000ff;">true</span>, keyProperty = "id"<span style="color: #000000;">) 
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">int</span> add(User user) <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception; 
 
</span><span style="color: #008000;">//</span><span style="color: #008000;">删除</span> 
@Delete("delete from users where id = #{id}"<span style="color: #000000;">) 
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">boolean</span> delete(@Param("id") <span style="color: #0000ff;">long</span> id) <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception; 
 
</span><span style="color: #008000;">//</span><span style="color: #008000;">更新</span> 
@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}"<span style="color: #000000;">) 
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">boolean</span> update(User user) <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception; 

}

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测试单元

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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 
</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> UserMapper userMapper; 
 
@Test 
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> G() <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception { 
    System.out.println(userMapper.findAll()); 
} 
@Test 
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> g1() <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception { 
    System.out.println(userMapper.findById(</span>12L<span style="color: #000000;">)); 
} 
@Test 
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> g3() <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception { 
    User user </span>= <span style="color: #0000ff;">new</span><span style="color: #000000;"> User(); 
    user.setName(</span>"无极"<span style="color: #000000;">); 
    user.setUsername(</span>"六六qijiu"<span style="color: #000000;">); 
    user.setPassword(</span>"12443345"<span style="color: #000000;">); 
    userMapper.add(user); 
    System.out.println(user.getId()); 
} 
@Test 
</span><span style="color: #008000;">//</span><span style="color: #008000;">删除</span> 
<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> g4() <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception{ 
    </span><span style="color: #0000ff;">long</span> id = 14<span style="color: #000000;">; 
    System.out.println(userMapper.delete(id)); 
} 
 
@Test 
</span><span style="color: #008000;">//</span><span style="color: #008000;">更新</span> 
<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> g5() <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception{ 
    User user </span>= userMapper.findById(16<span style="color: #000000;">); 
    user.setUsername(</span>"七七七"<span style="color: #000000;">); 
    System.out.println(userMapper.update(user)); 
} 
@Test 
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> g6() <span style="color: #0000ff;">throws</span><span style="color: #000000;"> Exception{ 
    List</span>&lt;User&gt; users = userMapper.findByPhone("13101436674"<span style="color: #000000;">); 
    </span><span style="color: #0000ff;">for</span><span style="color: #000000;"> (User user : users) 
        System.out.println(user.getId() </span>+ "***" +<span style="color: #000000;"> user.getPhone()); 
} 

}

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


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