如何使用MongoTemplate执行各种增删改查的语句

1.案例代码如：

Query query=new Query(Criteria.where("userName").is(userName));
UserEntity user =  mongoTemplate.findOne(query , UserEntity.class);

2.各种增删改如下;

增
mongoTemplate.save(user);
删
mongoTemplate.remove(query,UserEntity.class);
改
Update update= new Update().set("userName", user.getUserName()).set("passWord", user.getPassWord());
//更新查询返回结果集的第一条
WriteResult result =mongoTemplate.updateFirst(query,update,UserEntity.class);
查
Query query=new Query(Criteria.where("userName").is(userName));
UserEntity user =  mongoTemplate.findOne(query , UserEntity.class);

3.MongoDB分页查询如下所示：

//利用工具类拼装分页信息 
 SpringbootMongoDBPageable pageable = new SpringbootMongoDBPageable(); 
 MongoDBPageModel pm=new MongoDBPageModel(); 
 pm.setPagesize(3);
 pm.setPagenumber(1); 
 List<Order> orders = new ArrayList<>();
 //排序信息
 orders.add(new Order(Direction.DESC, "age"));
 Sort sort = new Sort(orders);
 pm.setSort(sort);
 pageable.setPage(pm);
 //拼装查询信息
 Query query = new Query();
 Criteria criteria = new Criteria();
 query.addCriteria(criteria.where("age").gte(6).lte(18));
 //检索6-18岁的
 query.addCriteria(criteria.where("name").regex("文"));
 //模糊查询名字
 Long count = mongoTemplate.count(query, OrdersData.class);
 //查询总记录数
 List<Entry> list = mongoTemplate.find(query.with(pageable), Entry.class);