在.net core中完美解决多租户分库分表的问题

class Program
    {
        static IServiceProvider provider;
        static Program()
        {
            var services = new ServiceCollection();
            services.AddCRL<DBLocationCreator>();
            services.AddScoped<Code.Sharding.MemberManage>();

            provider = services.BuildServiceProvider();
            provider.UseCRL();
        }

        static void Main(string[] args)
        {

        label1:
            var instance = provider.GetService<Code.Sharding.MemberManage>();
            var data = new Code.Sharding.MemberSharding();

            data.Code = "01";
            instance.SetLocation(data);
            var find1 = instance.QueryItem(b => b.Id > 0)?.Name;
            Console.WriteLine($"定位数据输入{data.Code},查询值为{find1}");

            data.Code = "02";
            instance.SetLocation(data);
            var find2 = instance.QueryItem(b => b.Id > 0)?.Name;
            Console.WriteLine($"定位数据输入{data.Code},查询值为{find2}");
            Console.ReadLine();
            goto label1;
        }
    }

 public class DBLocationCreator : IDBLocationCreator
    {
        ISettingConfigBuilder _settingConfigBuilder;
        public DBLocationCreator(ISettingConfigBuilder settingConfigBuilder)
        {
            _settingConfigBuilder = settingConfigBuilder;
        }

        public void Init()
        {
            //自定义定位
            _settingConfigBuilder.RegisterLocation<Code.Sharding.MemberSharding>((t, a) =>
            {
                var tableName = t.TableName;
                var dbName = a.Code == "02" ? "testdb2" : "testdb";
                var dataBase = $"Data Source=.;Initial Catalog={dbName};User ID=sa;Password=123";
                //返回定位库和表名
                return new CRL.Sharding.Location(dataBase, tableName);
            });
            _settingConfigBuilder.RegisterDBAccessBuild(dbLocation =>
            {
                var connectionString = "Data Source=.;Initial Catalog=testdb;User ID=sa;Password=123";
                if (dbLocation.ShardingLocation != null)
                {
                    connectionString = dbLocation.ShardingLocation.DataBaseSource;
                }
                return new CRL.DBAccessBuild(DBType.MSSQL, connectionString);
            });
        }
    }