1、SpringBoot整合MyBatis

1.1、在pom.xml中添加依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.3</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.2.1</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

1.2、在application.yml配置mybatis的数据源

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: shijikl126
    url: jdbc:mysql://localhost:3306/test_mbatis

mybatis的配置

mybatis:
  mapper-locations: classpath:/mappers/*.xml
  type-aliases-package: com.sj.domain

1.3、在主函数中添加扫描dao的注解

@SpringBootApplication
@MapperScan("com.sj.dao")
public class Application4 {
    public static void main(String[] args) {
        SpringApplication.run(Application4.class, args);
    }
}

1.4、MyBatis的配置三个方法如下

1、指定配置文件mybatis-config.xml

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

<configuration>
    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

2、直接在application.yml中指定

mybatis:
  configuration:
    map-underscore-to-camel-case: true

3、或者在java中实现ConfigurationCustomizer对象设置

@Configuration
public class MyBatisConfig {
    @Bean
    ConfigurationCustomizer customizer() {
        return (cfg)-> {
            cfg.setMapUnderscoreToCamelCase(true);
        };
    }
}

2、starter的命名规范

SpringBoot官方提供的starter: spring-boot-starter-*
自定义的starter（非SpringBoot官方）：*-spring-boot-starter