MongoRepository如何使用 & MongoTemplate 移除 _class 字段

1.SpringBoot 2.2.0 SpringData MongoDB使用示例(一)
https://blog.csdn.net/pingpei1133/article/details/103104426?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-16.compare&depth_1-
utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-16.compare
2.Spring boot集成mongodb使用MongoRepository完成CURD和复杂查询
https://blog.csdn.net/weixin_39214304/article/details/84791953
3.Mongodb入门教程-MongoRepository基础篇
https://www.jianshu.com/p/f47621a224a6
4.MONGOREPOSITORY 支持的所有接口
https://www.cnblogs.com/vana/p/11171755.html

MongoTemplate 移除 _class 字段

@Configuration
public class ApplicationReadyListener implements ApplicationListener<ContextRefreshedEvent> {

@Autowired
MongoTemplate mongoTemplate;

@Override
public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {
MongoConverter converter = mongoTemplate.getConverter();
if (converter.getTypeMapper().isTypeKey("_class")) {
((MappingMongoConverter) converter).setTypeMapper(new DefaultMongoTypeMapper(null));
}
}
}

MongoTemplate针对多条件查询以及复杂查询基本示例

https://blog.csdn.net/junqilong/article/details/79379399

查询或语句：a || b

1. Criteria criteria = new Criteria();
2. criteria.orOperator(Criteria.where("key1").is("0"),Criteria.where("key1").is(null));

查询且语句：a && b
Criteria criteria = new Criteria();
criteria.and(“key1”).is(false);
criteria.and(“key2”).is(type);
Query query = new Query(criteria);
long totalCount = this.mongoTemplate.count(query, Xxx.class);