尚医通06：数据字典+EasyExcel+mongodb

内容介绍

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| 1、数据字典列表前端 2、EasyExcel介绍、实例 3、数据字典导出接口、前端 4、数据字典导入接口、前端 5、数据字典添加redis缓存 6、MongoDB简介 7、MongoDB安装 8、MongoDB基本概念 |

数据字典列表前端

EasyExcel介绍、实例

数据字典导出、前端

数据字典导入、前端

数据字典添加redis缓存

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| 1、redis回顾 2、准备工作（1）虚拟机（2）安装redis （3）检查配置（4）启动redis 3、redis缓存访问机制 4、整合redis （1）common_utils模块，添加redis依赖 <dependencies> \<!-- redis --\><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> \<!-- spring2.X集成redis所需common-pool2--\><dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-pool2</artifactId> <version>2.6.0</version> </dependency> </dependencies> （2）common_utils模块，添加Redis配置类 @Configuration @EnableCaching public class RedisConfig { /\*\* \*设置RedisTemplate规则 \* @paramredisConnectionFactory\* @return \*/@Bean public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) { RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<>(); redisTemplate.setConnectionFactory(redisConnectionFactory); Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class); //解决查询缓存转换异常的问题 ObjectMapper om = new ObjectMapper(); //指定要序列化的域，field,get和set,以及修饰符范围，ANY是都有包括private和publicom.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); //指定序列化输入的类型，类必须是非final修饰的，final修饰的类，比如String,Integer等会跑出异常 om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL); jackson2JsonRedisSerializer.setObjectMapper(om); //序列号key valueredisTemplate.setKeySerializer(new StringRedisSerializer()); redisTemplate.setValueSerializer(jackson2JsonRedisSerializer); redisTemplate.setHashKeySerializer(new StringRedisSerializer()); redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer); redisTemplate.afterPropertiesSet(); return redisTemplate; } /\*\* \*设置CacheManager缓存规则 \* @paramfactory\* @return \*/@Bean public CacheManager cacheManager(RedisConnectionFactory factory) { RedisSerializer<String> redisSerializer = new StringRedisSerializer(); Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class); //解决查询缓存转换异常的问题 ObjectMapper om = new ObjectMapper(); om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL); jackson2JsonRedisSerializer.setObjectMapper(om); //配置序列化（解决乱码的问题）,过期时间600秒 RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig() .entryTtl(Duration.ofSeconds(600)) .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer)) .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer)) .disableCachingNullValues(); RedisCacheManager cacheManager = RedisCacheManager.builder(factory) .cacheDefaults(config) .build(); return cacheManager; } } （3）在service_cmn模块添加redis配置 spring.redis.host=192.168.140.138 spring.redis.port=6379 spring.redis.database= 0 spring.redis.timeout=1800000 spring.redis.lettuce.pool.max-active=20 spring.redis.lettuce.pool.max-wait=-1 #最大阻塞等待时间(负数表示没限制)spring.redis.lettuce.pool.max-idle=5 spring.redis.lettuce.pool.min-idle=0 (4)查询方法添加注解 @Override // redis k:v k=dict::selectIndexList v=List\<Dict\>@Cacheable(value = "dict", key = "'selectIndexList'") public List<Dict> findChildData(Long id) { //1拼写查询条件 LambdaQueryWrapper<Dict> wrapper = new LambdaQueryWrapper<>(); wrapper.eq(Dict::getParentId,id); //2查询子数据集合 List<Dict> dictList = baseMapper.selectList(wrapper); //3遍历集合,确认是否有子数据 for (Dict dict : dictList) { boolean isChildren = this.isChildren(dict); dict.setHasChildren(isChildren); } return dictList; } 5、问题解决（1）问题描述 *一级数据可以走缓存 *二级数据加载不出来（2）问题定位 *二级数据查询需要查询数据库 *二级数据没有查询数据库，查询缓存获取一级数据（3）解决方案让多次查询redis缓存的key不一样 //根据数据id查询子数据列表 @Override // redis k:v k=dict::selectIndexList v=List\<Dict\>@Cacheable(value = "dict", key = "'selectIndexList'+#id") public List<Dict> findChildData(Long id) { //1拼写查询条件 LambdaQueryWrapper<Dict> wrapper = new LambdaQueryWrapper<>(); wrapper.eq(Dict::getParentId,id); //2查询子数据集合 List<Dict> dictList = baseMapper.selectList(wrapper); //3遍历集合,确认是否有子数据 for (Dict dict : dictList) { boolean isChildren = this.isChildren(dict); dict.setHasChildren(isChildren); } return dictList; } 4、redis缓存写操作同步机制 |

MongoDB简介

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| 1 NoSQL概述 2、MongoDB是什么 MongoDB 是由C++语言编写的，是一个基于分布式文件存储的开源数据库系统。 MongoDB 是文档型NOSQL数据库 |