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### XML映射
1. XML名称与Mapper接口名称一致，同包同名
### SpringBoot配置文件
properties 配置文件 臃肿不清晰
yaml/yml 配置文件 清晰简洁
1. 配置文件名可以任意，但建议以application开头，如application.yml
2. 以空格为缩进，相同层级的属性，缩进相同，左边对齐
