protected override Expression <Func <string, bool> > GetRouteToFilter(DateTime shardingKey, ShardingOperatorEnum shardingOperator)
{
var t = TimeFormatToTail(shardingKey);
switch (shardingOperator)
{
case ShardingOperatorEnum.GreaterThan:
case ShardingOperatorEnum.GreaterThanOrEqual:
return(tail => String.Compare(tail, t, StringComparison.Ordinal) >= 0);
case ShardingOperatorEnum.LessThan:
{
var currentMonth = ShardingCoreHelper.GetCurrentMonthFirstDay(shardingKey);
//处于临界值 o=>o.time < [2021-01-01 00:00:00] 尾巴20210101不应该被返回
if (currentMonth == shardingKey)
{
return(tail => String.Compare(tail, t, StringComparison.Ordinal) < 0);
}
return(tail => String.Compare(tail, t, StringComparison.Ordinal) <= 0);
}
case ShardingOperatorEnum.LessThanOrEqual:
return(tail => String.Compare(tail, t, StringComparison.Ordinal) <= 0);
case ShardingOperatorEnum.Equal: return(tail => tail == t);
default:
{
#if DEBUG
Console.WriteLine($"shardingOperator is not equal scan all table tail");
#endif
return(tail => true);
}
}
}
protected override string TimeFormatToTail(DateTime time)
{
var currentMonday = ShardingCoreHelper.GetCurrentMonday(time);
var currentSunday = ShardingCoreHelper.GetCurrentSunday(time);
return($"{currentMonday:yyyyMM}{currentMonday:dd}_{currentSunday:dd}");
}
public override List <string> GetAllTails()
{
var beginTime = ShardingCoreHelper.GetCurrentMonthFirstDay(GetBeginTime());
var tails = new List <string>();
//提前创建表
var nowTimeStamp = ShardingCoreHelper.GetNextMonthFirstDay(beginTime);
if (beginTime > nowTimeStamp)
{
throw new ArgumentException("起始时间不正确无法生成正确的表名");
}
var currentTimeStamp = beginTime;
while (currentTimeStamp <= nowTimeStamp)
{
var tail = ShardingKeyToTail(currentTimeStamp);
tails.Add(tail);
currentTimeStamp = ShardingCoreHelper.GetNextMonthFirstDay(currentTimeStamp);
}
return(tails);
}
public override List <string> GetAllTails()
{
var beginTime = GetBeginTime();
var tails = new List <string>();
//提前创建表
var nowTimeStamp = beginTime.AddYears(1).Date;
if (beginTime > nowTimeStamp)
{
throw new ArgumentException("起始时间不正确无法生成正确的表名");
}
var currentTimeStamp = beginTime;
while (currentTimeStamp <= nowTimeStamp)
{
var currentTimeStampLong = ShardingCoreHelper.ConvertDateTimeToLong(currentTimeStamp);
var tail = ShardingKeyToTail(currentTimeStampLong);
tails.Add(tail);
currentTimeStamp = currentTimeStamp.AddYears(1);
}
return(tails);
}
/// <summary>
/// 如何将shardingkey转成对应的tail
/// </summary>
/// <param name="shardingKey"></param>
/// <returns></returns>
public override string ShardingKeyToTail(object shardingKey)
{
var shardingKeyStr = ConvertToShardingKey(shardingKey);
return(Math.Abs(ShardingCoreHelper.GetStringHashCode(shardingKeyStr) % Mod).ToString());
}
protected override string TimeFormatToTail(long time)
{
var datetime = ShardingCoreHelper.ConvertLongToDateTime(time);
return($"{datetime:yyyy}");
}
