遇到的問題：

1.原因是在啟動類上只有一個@MapperScan注解。需要配置這個注解的basePackages。

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

之后刪除掉@EnableAutoConfiguration和@ComponentScan(basePackages = {"com.chenxin.springboot_0702"})也照樣運行成功。

?第二個問題：測試類 里面用@Autowired注解自動裝配UserMapper時會有提示報錯，但是執行起來沒有問題，可以通過。

改成@Resource注解則沒有紅線了。

　　　　　　

?

?

首先配置pom.xml文件。springboot的項目都是jar包，不是war包。還有就是依賴模塊spring-boot-starter-jdbc不需要，因為在mybatis-spring-boot-starter中已經包含了。

<?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依賴 --><!--junit不需要springboot已經自動加載了。-->
　　　　　<!--spring-boot-starter-jdbc已經包含在了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分頁插件--><!-- 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的連接配置 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

接著是model類。

| 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類。

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(); }

接著說springboot啟動類。最開始提過了在這里只用了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 //開啟通用注解掃描 //@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);} }

?測試類

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());} }

?

接下來是其他的增刪改查。其中更新使用的@Update注解，貌似可以自動判斷是否為空，只要為空就不更新了。

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 {//查詢@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;//刪除@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; }

測試單元

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("無極");user.setUsername("六六qijiu");user.setPassword("12443345");userMapper.add(user);System.out.println(user.getId());}@Test//刪除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

轉載于:https://www.cnblogs.com/jpfss/p/11375538.html

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