mybatis map 驼峰

最新推荐文章于 2024-09-25 21:34:30 发布

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最新推荐文章于 2024-09-25 21:34:30 发布

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分类专栏：后端文章标签： java

原文链接：https://blog.youkuaiyun.com/sg_knight/article/details/104217329

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这篇博客介绍了如何在Mybatis配置中实现map类型结果集的下划线键名自动转换为驼峰命名，通过自定义Mapper对象包装工厂来实现这一功能，对`map-underscore-to-camel-case`进行了启用。

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@Configuration
public class MybatisConfig {
    /**
     * mybatis resultType为map时下划线键值转小写驼峰形式插
     */
    @Bean
    public ConfigurationCustomizer configurationCustomizer() {
        return configuration -> configuration.setObjectWrapperFactory(new MapWrapperFactory());
    }
 
    
    static class MapWrapperFactory implements ObjectWrapperFactory {
        @Override
        public boolean hasWrapperFor(Object object) {
            return object != null && object instanceof Map;
        }
 
        @Override
        public ObjectWrapper getWrapperFor(MetaObject metaObject, Object object) {
            return new MyMapWrapper(metaObject, (Map) object);
        }
    }
 
    static class MyMapWrapper extends MapWrapper {
        MyMapWrapper(MetaObject metaObject, Map<String, Object> map) {
            super(metaObject, map);
        }
 
        @Override
        public String findProperty(String name, boolean useCamelCaseMapping) {
            if (useCamelCaseMapping
                    && ((name.charAt(0) >= 'A' && name.charAt(0) <= 'Z')
                    || name.contains("_"))) {
                return underlineToCamelhump(name);
            }
            return name;
        }
 
        /**
         * 将下划线风格替换为驼峰风格
         *
         * @param inputString
         * @return
         */
        private String underlineToCamelhump(String inputString) {
            StringBuilder sb = new StringBuilder();
 
            boolean nextUpperCase = false;
            for (int i = 0; i < inputString.length(); i++) {
                char c = inputString.charAt(i);
                if (c == '_') {
                    if (sb.length() > 0) {
                        nextUpperCase = true;
                    }
                } else {
                    if (nextUpperCase) {
                        sb.append(Character.toUpperCase(c));
                        nextUpperCase = false;
                    } else {
                        sb.append(Character.toLowerCase(c));
                    }
                }
            }
            return sb.toString();
        }
    }
}

.yml

mybatis:
  configuration:
    #开启自动下划线格式转驼峰格式
    map-underscore-to-camel-case: true