MongoDB聚合框架之$facet操作符详解：高效分组统计与结果筛选

${$facet:{total:{$count:"count"},rows:{$skip:0},{$limit:3}}}$转java内容：Document facet = new Document("$$facet", new Document("total", Arrays.asList(new Document("$$count", "count"))), "rows", Arrays.asList(new Document("$$skip", 0), new Document("$$limit", 3)));Document query = new Document();query.append("$$facet", facet); // Convert to Java codeBsonDocument facet = BsonDocument.parse("{$facet: { total: [{$count: 'count'}], rows: [{$skip: 0}, {$limit: 3}]}}");BsonDocument query = new BsonDocument("$$facet", facet);