70 lines
2.3 KiB
C#
70 lines
2.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using ShardingCore.Core.VirtualRoutes;
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using ShardingCore.Core.VirtualRoutes.Abstractions;
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using ShardingCore.Helpers;
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using ShardingCore.Test50.Domain.Entities;
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namespace ShardingCore.Test50.Shardings
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{
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/*
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* @Author: xjm
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* @Description:
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* @Date: Wednesday, 20 January 2021 10:46:37
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* @Email: 326308290@qq.com
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*/
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public class SysUserRangeVirtualRoute: AbstractShardingOperatorVirtualRoute<SysUserRange, string>
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{
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private int _mod = 1000;
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protected override string ConvertToShardingKey(object shardingKey)
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{
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return shardingKey.ToString();
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}
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public override string ShardingKeyToTail(object shardingKey)
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{
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var shardingKeyStr = ConvertToShardingKey(shardingKey);
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var m = Math.Abs(ShardingCoreHelper.GetStringHashCode(shardingKeyStr) % _mod);
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if (m > 800)//801-999
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{
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return "3";
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} else if (m > 600)//601-800
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{
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return "2";
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} else if (m > 300)//301-600
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{
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return "1";
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} else //0-300
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{
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return "0";
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}
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}
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public override List<string> GetAllTails()
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{
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return new(){"0", "1","2","3"};
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}
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protected override Expression<Func<string, bool>> GetRouteToFilter(string shardingKey, ShardingOperatorEnum shardingOperator)
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{
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var t = ShardingKeyToTail(shardingKey);
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switch (shardingOperator)
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{
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case ShardingOperatorEnum.Equal: return tail => tail == t;
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default:
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{
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Console.WriteLine($"shardingOperator is not equal scan all table tail");
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return tail => true;
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}
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}
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}
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// public override List<IPhysicTable> AfterPhysicTableFilter(List<IPhysicTable> allPhysicTables, List<IPhysicTable> filterPhysicTables)
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// {
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// if (filterPhysicTables.Count > 1)
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// throw new Exception($"query {nameof(SysUserRange)} not support cross table");
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// return base.AfterPhysicTableFilter(allPhysicTables, filterPhysicTables);
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// }
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}
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} |