集成参考官方链接：http://mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/

SpringBoot基本依赖

  1. <!--   1. 继承父项目，里面有所需的各种版本-->
  2.     <parent>
  3.         <artifactId>spring-boot-starter-parent</artifactId>
  4.         <groupId>org.springframework.boot</groupId>
  5.         <version>2.3.4.RELEASE</version>
  6.     </parent>
  9.     <dependencies>
  10. <!--       2. web项目依赖，里面已经集成了各种SpringMVC相关的依赖-->
  11.         <dependency>
  12.             <groupId>org.springframework.boot</groupId>
  13.             <artifactId>spring-boot-starter-web</artifactId>
  14.         </dependency>
  16.         <!-- 热部署 -->
  17.         <dependency>
  18.             <groupId>org.springframework.boot</groupId>
  19.             <artifactId>spring-boot-devtools</artifactId>
  20.         </dependency>
  22. <!--        只需在编译期间有即可scope设置成provided-->
  23.         <dependency>
  24.             <groupId>org.projectlombok</groupId>
  25.             <artifactId>lombok</artifactId>
  26.             <scope>provided</scope>
  27.         </dependency>
  29. <!--        当模型文件里面属性修改时，配置文件里面会有提示信息-->
  30.         <dependency>
  31.             <groupId>org.springframework.boot</groupId>
  32.             <artifactId>spring-boot-configuration-processor</artifactId>
  33.         </dependency>
  35. <!--        页面模板-->
  36.         <dependency>
  37.             <groupId>org.springframework.boot</groupId>
  38.             <artifactId>spring-boot-starter-thymeleaf</artifactId>
  39.         </dependency>
  40.     </dependencies>
  43.     <build>
  44.         <finalName>springBoot_mybatis</finalName>
  45.         <plugins>
  46.             <plugin>
  47.                 <groupId>org.springframework.boot</groupId>
  48.                 <artifactId>spring-boot-maven-plugin</artifactId>
  49.             </plugin>
  50.         </plugins>
  51.         <!-- 说明资源的位置（哪些东西算是资源） -->
  52.         <resources>
  53.             <!-- resources文件里面的内容要进行打包 -->
  54.             <resource>
  55.                 <directory>src/main/resources</directory>
  56.             </resource>
  57.             <!-- java文件里面的内容要进行打包 -->
  58.             <resource>
  59.                 <directory>src/main/java</directory>
  60.                 <includes>
  61.                     <include>**/*.properties</include>
  62.                     <include>**/*.xml</include>
  63.                 </includes>
  64.             </resource>
  65.         </resources>
  66.     </build>

SpringBoot中集成mybatis所需依赖

  1. <!--        SpringBoot集成MyBatis所需的依赖-->
  2.         <dependency>
  3.             <groupId>org.mybatis.spring.boot</groupId>
  4.             <artifactId>mybatis-spring-boot-starter</artifactId>
  5.             <version>2.1.3</version>
  6.         </dependency>
  8. <!--        使用MySQL数据库-->
  9.         <dependency>
  10.             <groupId>mysql</groupId>
  11.             <artifactId>mysql-connector-java</artifactId>
  12.         </dependency>
  13. <!--        连接池使用druid-->
  14.         <dependency>
  15.             <groupId>com.alibaba</groupId>
  16.             <artifactId>druid-spring-boot-starter</artifactId>
  17.             <version>1.2.1</version>
  18.         </dependency>

application.yml文件信息

  1. spring:
  2.   datasource:
  3.     type: com.alibaba.druid.pool.DruidDataSource
  4.     driver-class-name: com.mysql.cj.jdbc.Driver
  5.     username: root
  6.     password: root
  7.     url: jdbc:mysql://localhost:3306/customer_test?serverTimezone=UTC
  8.     druid:
  9.       initial-size: 5
  10.       max-active: 10
  11. mybatis:
  12. #  mapper映射文件的位置
  13.   #  mapper-locations: classpath:/mappers/*.xml
  14. #  类设置别名，默认是类名首字母小写
  15.   type-aliases-package: com.lff.domain
  16. #  mybatis核心配置文件位置
  17. #  config-location: classpath:mybatis-config.xml
  18. #配置，如开启驼峰等
  19. #  configuration:
  20. #    map-underscore-to-camel-case: true
  21. #    use-generated-keys: true

数据源相关的配置可以参考：

  • datasource相关

Snipaste_2021-12-05_13-01-06.png
Snipaste_2021-12-05_13-01-24.png

  • 连接池Druid配置，参考DruidDataSourceWrapper

image.png

Mybatis相关配置可以参考MybatisProperties
Snipaste_2021-12-05_13-09-33.png

入口文件编写

  1. @SpringBootApplication //标识这个是Springboot的启动类
  2. @MapperScan("com.lff.dao") //扫描dao生成代理对象
  3. public class Application {
  4.     public static void main(String[] args) {
  5.         //可以理解固定写法，启动
  6.         SpringApplication.run(Application.class,args);
  7.     }
  8. }

一定要有@MapperScan(“com.lff.dao”)生成Dao的代理对象。

MyBatis核心配置文件有3种编写方式

a) xml的方式，在application.yml文件里面指定配置文件的位置

  1. mybatis:
  2.   config-location: classpath:mybatis-config.xml

mybatis-config.xml

  1. <?xml version="1.0" encoding="UTF-8" ?>
  2. <!--        注意 XML 头部的声明，它用来验证 XML 文档的正确性。-->
  3. <!DOCTYPE configuration
  4.         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  5.         "http://mybatis.org/dtd/mybatis-3-config.dtd">
  6. <configuration>
  8.     <!-- 其他设置 -->
  9.     <settings>
  10.         <!-- 使用新生成记录的主键 -->
  11.         <setting name="useGeneratedKeys" value="true"/>
  12.         <!-- 数据库：开启驼峰标识 -->
  13.         <setting name="mapUnderscoreToCamelCase" value="true"/>
  14.     </settings>
  16. </configuration>

b) 注解的方式,参考：http://mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/

  1. @Configuration
  2. public class MyBatisConfig {
  3.     @Bean
  4.     public ConfigurationCustomizer customizer() {
  5.         return (configuration) -> {
  6.             configuration.setMapUnderscoreToCamelCase(true);
  7.             configuration.setUseGeneratedKeys(true);
  8.         };
  9.     }
  10. }

c)直接在application.yml文件中配置

  1. mybatis:
  2.   #配置，如开启驼峰等
  3.   configuration:
  4.     map-underscore-to-camel-case: true
  5.     use-generated-keys: true

业务逻辑和以前一样写Controller层、Service层、Dao层、mapper文件就可以啦。