using MongoDB.Bson;
using System;
using System.Collections.Generic;
using System.Text;

namespace CZFW.MDB.Util
{
    //自增字段实现
    public class AutoInc
    {
        public static int GetNext(string sid, string pageName, string tplName)
        {
            IMongoRepository mongoRepository = new MongoRepository($"{tplName}_{Constants.AUTO_INC_TABLE_NAME}");
            var filter = new BsonDocument(Constants.AUTO_INC_FIELD, $"{sid}_{pageName}");
            var update = BsonDocument.Parse($"{{$inc:{{{Constants.AUTO_INC_VALUE_FIELD}:1}}}}");
            var res = mongoRepository.CurrentTable.FindOneAndUpdate<BsonDocument>(filter, update,new MongoDB.Driver.FindOneAndUpdateOptions<BsonDocument, BsonDocument> { IsUpsert=true, ReturnDocument=MongoDB.Driver.ReturnDocument.After});
            return res[Constants.AUTO_INC_VALUE_FIELD].AsInt32;
        }
    }
}