using FreeSql.Internal.Model;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data;
using System.Data.Common;
using System.Diagnostics;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace FreeSql.Internal.CommonProvider
{

    public abstract class Select0Provider<TSelect, T1> : ISelect0<TSelect, T1> where TSelect : class where T1 : class
    {

        protected int _limit, _skip;
        protected string _select = "SELECT ", _orderby, _groupby, _having;
        protected StringBuilder _where = new StringBuilder();
        protected List<DbParameter> _params = new List<DbParameter>();
        protected List<SelectTableInfo> _tables = new List<SelectTableInfo>();
        protected List<Func<Type, string, string>> _tableRules = new List<Func<Type, string, string>>();
        protected StringBuilder _join = new StringBuilder();
        protected IFreeSql _orm;
        protected CommonUtils _commonUtils;
        protected CommonExpression _commonExpression;
        protected DbTransaction _transaction;
        protected DbConnection _connection;
        protected Action<object> _trackToList;
        protected List<Action<object>> _includeToList = new List<Action<object>>();
        protected bool _distinct;
        protected Expression _selectExpression;
        protected List<LambdaExpression> _whereCascadeExpression = new List<LambdaExpression>();

        bool _isDisponse = false;
        ~Select0Provider()
        {
            if (_isDisponse) return;
            _isDisponse = false;
            _where.Clear();
            _params.Clear();
            _tables.Clear();
            _tableRules.Clear();
            _join.Clear();
            _trackToList = null;
            _includeToList.Clear();
            _selectExpression = null;
            _whereCascadeExpression.Clear();
        }
        public static void CopyData(Select0Provider<TSelect, T1> from, object to, ReadOnlyCollection<ParameterExpression> lambParms)
        {
            var toType = to?.GetType();
            if (toType == null) return;
            toType.GetField("_limit", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._limit);
            toType.GetField("_skip", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._skip);
            toType.GetField("_select", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._select);
            toType.GetField("_orderby", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._orderby);
            toType.GetField("_groupby", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._groupby);
            toType.GetField("_having", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._having);
            toType.GetField("_where", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, new StringBuilder().Append(from._where.ToString()));
            toType.GetField("_params", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, new List<DbParameter>(from._params.ToArray()));
            if (lambParms == null)
                toType.GetField("_tables", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, new List<SelectTableInfo>(from._tables.ToArray()));
            else
            {
                var _multiTables = toType.GetField("_tables", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(to) as List<SelectTableInfo>;
                _multiTables[0] = from._tables[0];
                for (var a = 1; a < lambParms.Count; a++)
                {
                    var tb = from._tables.Where(b => b.Alias == lambParms[a].Name && b.Table.Type == lambParms[a].Type).FirstOrDefault();
                    if (tb != null) _multiTables[a] = tb;
                    else
                    {
                        _multiTables[a].Alias = lambParms[a].Name;
                        _multiTables[a].Parameter = lambParms[a];
                    }
                }
                if (_multiTables.Count < from._tables.Count)
                    _multiTables.AddRange(from._tables.GetRange(_multiTables.Count, from._tables.Count - _multiTables.Count));
            }
            toType.GetField("_tableRules", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._tableRules);
            toType.GetField("_join", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, new StringBuilder().Append(from._join.ToString()));
            //toType.GetField("_orm", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._orm);
            //toType.GetField("_commonUtils", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._commonUtils);
            //toType.GetField("_commonExpression", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._commonExpression);
            toType.GetField("_transaction", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._transaction);
            toType.GetField("_connection", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._connection);
            toType.GetField("_trackToList", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._trackToList);
            toType.GetField("_includeToList", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._includeToList);
            toType.GetField("_distinct", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._distinct);
            toType.GetField("_selectExpression", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._selectExpression);
            toType.GetField("_whereMultiExpression", BindingFlags.Instance | BindingFlags.NonPublic)?.SetValue(to, from._whereCascadeExpression);
        }

        public Select0Provider(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere)
        {
            _orm = orm;
            _commonUtils = commonUtils;
            _commonExpression = commonExpression;
            _tables.Add(new SelectTableInfo { Table = _commonUtils.GetTableByEntity(typeof(T1)), Alias = "a", On = null, Type = SelectTableInfoType.From });
            this.Where(_commonUtils.WhereObject(_tables.First().Table, "a.", dywhere));
            if (_orm.CodeFirst.IsAutoSyncStructure && typeof(T1) != typeof(object)) _orm.CodeFirst.SyncStructure<T1>();
        }

        public TSelect TrackToList(Action<object> track)
        {
            _trackToList = track;
            return this as TSelect;
        }

        public TSelect WithTransaction(DbTransaction transaction)
        {
            _transaction = transaction;
            _connection = _transaction?.Connection;
            return this as TSelect;
        }
        public TSelect WithConnection(DbConnection connection)
        {
            if (_transaction?.Connection != connection) _transaction = null;
            _connection = connection;
            return this as TSelect;
        }

        public bool Any()
        {
            this.Limit(1);
            return this.ToList<int>("1").FirstOrDefault() == 1;
        }
        async public Task<bool> AnyAsync()
        {
            this.Limit(1);
            return (await this.ToListAsync<int>("1")).FirstOrDefault() == 1;
        }

        public long Count() => this.ToList<int>("count(1)").FirstOrDefault();
        async public Task<long> CountAsync() => (await this.ToListAsync<int>("count(1)")).FirstOrDefault();

        public TSelect Count(out long count)
        {
            count = this.Count();
            return this as TSelect;
        }

        public TSelect GroupBy(string sql, object parms = null)
        {
            _groupby = sql;
            if (string.IsNullOrEmpty(_groupby)) return this as TSelect;
            _groupby = string.Concat(" \r\nGROUP BY ", _groupby);
            if (parms != null) _params.AddRange(_commonUtils.GetDbParamtersByObject(_groupby, parms));
            return this as TSelect;
        }
        public TSelect Having(string sql, object parms = null)
        {
            if (string.IsNullOrEmpty(_groupby) || string.IsNullOrEmpty(sql)) return this as TSelect;
            _having = string.Concat(_having, " AND (", sql, ")");
            if (parms != null) _params.AddRange(_commonUtils.GetDbParamtersByObject(sql, parms));
            return this as TSelect;
        }

        public TSelect LeftJoin(Expression<Func<T1, bool>> exp)
        {
            if (exp == null) return this as TSelect;
            _tables[0].Parameter = exp.Parameters[0];
            return this.InternalJoin(exp?.Body, SelectTableInfoType.LeftJoin);
        }
        public TSelect InnerJoin(Expression<Func<T1, bool>> exp)
        {
            if (exp == null) return this as TSelect;
            _tables[0].Parameter = exp.Parameters[0];
            return this.InternalJoin(exp?.Body, SelectTableInfoType.InnerJoin);
        }
        public TSelect RightJoin(Expression<Func<T1, bool>> exp)
        {
            if (exp == null) return this as TSelect; _tables[0].Parameter = exp.Parameters[0];
            return this.InternalJoin(exp?.Body, SelectTableInfoType.RightJoin);
        }
        public TSelect LeftJoin<T2>(Expression<Func<T1, T2, bool>> exp)
        {
            if (exp == null) return this as TSelect;
            _tables[0].Parameter = exp.Parameters[0];
            return this.InternalJoin(exp?.Body, SelectTableInfoType.LeftJoin);
        }
        public TSelect InnerJoin<T2>(Expression<Func<T1, T2, bool>> exp)
        {
            if (exp == null) return this as TSelect;
            _tables[0].Parameter = exp.Parameters[0];
            return this.InternalJoin(exp?.Body, SelectTableInfoType.InnerJoin);
        }
        public TSelect RightJoin<T2>(Expression<Func<T1, T2, bool>> exp)
        {
            if (exp == null) return this as TSelect;
            _tables[0].Parameter = exp.Parameters[0];
            return this.InternalJoin(exp?.Body, SelectTableInfoType.RightJoin);
        }

        public TSelect InnerJoin(string sql, object parms = null)
        {
            if (string.IsNullOrEmpty(sql)) return this as TSelect;
            _join.Append(" \r\nINNER JOIN ").Append(sql);
            if (parms != null) _params.AddRange(_commonUtils.GetDbParamtersByObject(sql, parms));
            return this as TSelect;
        }
        public TSelect LeftJoin(string sql, object parms = null)
        {
            if (string.IsNullOrEmpty(sql)) return this as TSelect;
            _join.Append(" \r\nLEFT JOIN ").Append(sql);
            if (parms != null) _params.AddRange(_commonUtils.GetDbParamtersByObject(sql, parms));
            return this as TSelect;
        }

        public TSelect Limit(int limit)
        {
            _limit = limit;
            return this as TSelect;
        }
        public TSelect Master()
        {
            _select = " SELECT ";
            return this as TSelect;
        }
        public TSelect Offset(int offset) => this.Skip(offset) as TSelect;

        public TSelect OrderBy(string sql, object parms = null) => this.OrderBy(true, sql, parms);
        public TSelect OrderBy(bool condition, string sql, object parms = null)
        {
            if (condition == false) return this as TSelect;
            if (string.IsNullOrEmpty(sql)) _orderby = null;
            var isnull = string.IsNullOrEmpty(_orderby);
            _orderby = string.Concat(isnull ? " \r\nORDER BY " : "", _orderby, isnull ? "" : ", ", sql);
            if (parms != null) _params.AddRange(_commonUtils.GetDbParamtersByObject(sql, parms));
            return this as TSelect;
        }
        public TSelect Page(int pageNumber, int pageSize)
        {
            this.Skip(Math.Max(0, pageNumber - 1) * pageSize);
            return this.Limit(pageSize) as TSelect;
        }

        public TSelect RightJoin(string sql, object parms = null)
        {
            if (string.IsNullOrEmpty(sql)) return this as TSelect;
            _join.Append(" \r\nRIGHT JOIN ").Append(sql);
            if (parms != null) _params.AddRange(_commonUtils.GetDbParamtersByObject(sql, parms));
            return this as TSelect;
        }

        public TSelect Skip(int offset)
        {
            _skip = offset;
            return this as TSelect;
        }
        public TSelect Take(int limit) => this.Limit(limit) as TSelect;

        public TSelect Distinct()
        {
            _distinct = true;
            return this as TSelect;
        }

        public DataTable ToDataTable(string field = null)
        {
            var sql = this.ToSql(field);
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            DataTable ret = null;
            Exception exception = null;
            try
            {
                ret = _orm.Ado.ExecuteDataTable(_connection, _transaction, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            return ret;
        }
        async public Task<DataTable> ToDataTableAsync(string field = null)
        {
            var sql = this.ToSql(field);
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            DataTable ret = null;
            Exception exception = null;
            try
            {
                ret = await _orm.Ado.ExecuteDataTableAsync(_connection, _transaction, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            return ret;
        }

        public List<TTuple> ToList<TTuple>(string field)
        {
            var sql = this.ToSql(field);
            var type = typeof(TTuple);
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            var ret = new List<TTuple>();
            var flagStr = $"ToListField:{field}";
            Exception exception = null;
            try
            {
                _orm.Ado.ExecuteReader(_connection, _transaction, dr =>
                {
                    var read = Utils.ExecuteArrayRowReadClassOrTuple(flagStr, type, null, dr, 0, _commonUtils);
                    ret.Add((TTuple)read.Value);
                }, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            return ret;
        }
        async public Task<List<TTuple>> ToListAsync<TTuple>(string field)
        {
            var sql = this.ToSql(field);
            var type = typeof(TTuple);
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            var ret = new List<TTuple>();
            var flagStr = $"ToListField:{field}";
            Exception exception = null;
            try
            {
                await _orm.Ado.ExecuteReaderAsync(_connection, _transaction, dr =>
                {
                    var read = Utils.ExecuteArrayRowReadClassOrTuple(flagStr, type, null, dr, 0, _commonUtils);
                    ret.Add((TTuple)read.Value);
                    return Task.FromResult(false);
                }, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            return ret;
        }
        internal List<T1> ToListAfPrivate(string sql, GetAllFieldExpressionTreeInfo af, (string field, ReadAnonymousTypeInfo read, List<object> retlist)[] otherData)
        {
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            var ret = new List<T1>();
            Exception exception = null;
            try
            {
                _orm.Ado.ExecuteReader(_connection, _transaction, dr =>
                {
                    ret.Add(af.Read(_orm, dr));
                    if (otherData != null)
                    {
                        var idx = af.FieldCount - 1;
                        foreach (var other in otherData)
                            other.retlist.Add(_commonExpression.ReadAnonymous(other.read, dr, ref idx, false));
                    }
                }, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            foreach (var include in _includeToList) include?.Invoke(ret);
            _orm.Aop.ToList?.Invoke(this, new Aop.ToListEventArgs(ret));
            _trackToList?.Invoke(ret);
            return ret;
        }
        async internal Task<List<T1>> ToListAfPrivateAsync(string sql, GetAllFieldExpressionTreeInfo af, (string field, ReadAnonymousTypeInfo read, List<object> retlist)[] otherData)
        {
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            var ret = new List<T1>();
            Exception exception = null;
            try
            {
                await _orm.Ado.ExecuteReaderAsync(_connection, _transaction, dr =>
                {
                    ret.Add(af.Read(_orm, dr));
                    if (otherData != null)
                    {
                        var idx = af.FieldCount - 1;
                        foreach (var other in otherData)
                            other.retlist.Add(_commonExpression.ReadAnonymous(other.read, dr, ref idx, false));
                    }
                    return Task.FromResult(false);
                }, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            foreach (var include in _includeToList) include?.Invoke(ret);
            _orm.Aop.ToList?.Invoke(this, new Aop.ToListEventArgs(ret));
            _trackToList?.Invoke(ret);
            return ret;
        }
        internal List<T1> ToListPrivate(GetAllFieldExpressionTreeInfo af, (string field, ReadAnonymousTypeInfo read, List<object> retlist)[] otherData)
        {
            string sql = null;
            if (otherData?.Length > 0)
            {
                var sbField = new StringBuilder().Append(af.Field);
                foreach (var other in otherData)
                    sbField.Append(other.field);
                sql = this.ToSql(sbField.ToString());
            }
            else
                sql = this.ToSql(af.Field);

            return ToListAfPrivate(sql, af, otherData);
        }
        internal Task<List<T1>> ToListPrivateAsync(GetAllFieldExpressionTreeInfo af, (string field, ReadAnonymousTypeInfo read, List<object> retlist)[] otherData)
        {
            string sql = null;
            if (otherData?.Length > 0)
            {
                var sbField = new StringBuilder().Append(af.Field);
                foreach (var other in otherData)
                    sbField.Append(other.field);
                sql = this.ToSql(sbField.ToString());
            }
            else
                sql = this.ToSql(af.Field);

            return ToListAfPrivateAsync(sql, af, otherData);
        }
        #region ToChunk
        internal void ToListAfChunkPrivate(int chunkSize, Action<List<T1>> chunkDone, string sql, GetAllFieldExpressionTreeInfo af, (string field, ReadAnonymousTypeInfo read, List<object> retlist)[] otherData)
        {
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            var ret = new List<T1>();
            var retCount = 0;
            Exception exception = null;
            var checkDoneTimes = 0;
            try
            {
                _orm.Ado.ExecuteReader(_connection, _transaction, dr =>
                {
                    ret.Add(af.Read(_orm, dr));
                    retCount++;
                    if (otherData != null)
                    {
                        var idx = af.FieldCount - 1;
                        foreach (var other in otherData)
                            other.retlist.Add(_commonExpression.ReadAnonymous(other.read, dr, ref idx, false));
                    }
                    if (chunkSize > 0 && chunkSize == ret.Count)
                    {
                        checkDoneTimes++;

                        foreach (var include in _includeToList) include?.Invoke(ret);
                        _orm.Aop.ToList?.Invoke(this, new Aop.ToListEventArgs(ret));
                        _trackToList?.Invoke(ret);
                        chunkDone(ret);
                        

                        ret.Clear();
                        if (otherData != null)
                            foreach (var other in otherData)
                                other.retlist.Clear();
                    }
                }, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, retCount);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            if (ret.Any() || checkDoneTimes == 0)
            {
                foreach (var include in _includeToList) include?.Invoke(ret);
                _orm.Aop.ToList?.Invoke(this, new Aop.ToListEventArgs(ret));
                _trackToList?.Invoke(ret);
                chunkDone(ret);
            }
        }
        internal void ToListChunkPrivate(int chunkSize, Action<List<T1>> chunkDone, GetAllFieldExpressionTreeInfo af, (string field, ReadAnonymousTypeInfo read, List<object> retlist)[] otherData)
        {
            string sql = null;
            if (otherData?.Length > 0)
            {
                var sbField = new StringBuilder().Append(af.Field);
                foreach (var other in otherData)
                    sbField.Append(other.field);
                sql = this.ToSql(sbField.ToString());
            }
            else
                sql = this.ToSql(af.Field);

            ToListAfChunkPrivate(chunkSize, chunkDone, sql, af, otherData);
        }
        public void ToChunk(int size, Action<List<T1>> done, bool includeNestedMembers = false)
        {
            if (_selectExpression != null) throw new ArgumentException("Chunk 功能之前不可使用 Select");
            this.ToListChunkPrivate(size, done, includeNestedMembers == false ? this.GetAllFieldExpressionTreeLevel2() : this.GetAllFieldExpressionTreeLevelAll(), null);
        }
        #endregion
        public virtual List<T1> ToList(bool includeNestedMembers = false)
        {
            if (_selectExpression != null) return this.InternalToList<T1>(_selectExpression);
            return this.ToListPrivate(includeNestedMembers == false ? this.GetAllFieldExpressionTreeLevel2() : this.GetAllFieldExpressionTreeLevelAll(), null);
        }
        public virtual Task<List<T1>> ToListAsync(bool includeNestedMembers = false)
        {
            if (_selectExpression != null) return this.InternalToListAsync<T1>(_selectExpression);
            return this.ToListPrivateAsync(includeNestedMembers == false ? this.GetAllFieldExpressionTreeLevel2() : this.GetAllFieldExpressionTreeLevelAll(), null);
        }
        public T1 ToOne()
        {
            this.Limit(1);
            return this.ToList().FirstOrDefault();
        }
        async public Task<T1> ToOneAsync()
        {
            this.Limit(1);
            return (await this.ToListAsync()).FirstOrDefault();
        }

        public T1 First() => this.ToOne();
        public Task<T1> FirstAsync() => this.ToOneAsync();

        protected List<TReturn> ToListMapReader<TReturn>((ReadAnonymousTypeInfo map, string field) af)
        {
            var sql = this.ToSql(af.field);
            var type = typeof(TReturn);
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            var ret = new List<TReturn>();
            Exception exception = null;
            try
            {
                _orm.Ado.ExecuteReader(_connection, _transaction, dr =>
                {
                    var index = -1;
                    ret.Add((TReturn)_commonExpression.ReadAnonymous(af.map, dr, ref index, false));
                }, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            _orm.Aop.ToList?.Invoke(this, new Aop.ToListEventArgs(ret));
            _trackToList?.Invoke(ret);
            return ret;
        }
        async protected Task<List<TReturn>> ToListMapReaderAsync<TReturn>((ReadAnonymousTypeInfo map, string field) af)
        {
            var sql = this.ToSql(af.field);
            var type = typeof(TReturn);
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            var ret = new List<TReturn>();
            Exception exception = null;
            try
            {
                await _orm.Ado.ExecuteReaderAsync(_connection, _transaction, dr =>
                {
                    var index = -1;
                    ret.Add((TReturn)_commonExpression.ReadAnonymous(af.map, dr, ref index, false));
                    return Task.FromResult(false);
                }, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            _orm.Aop.ToList?.Invoke(this, new Aop.ToListEventArgs(ret));
            _trackToList?.Invoke(ret);
            return ret;
        }
        protected (ReadAnonymousTypeInfo map, string field) GetExpressionField(Expression newexp)
        {
            var map = new ReadAnonymousTypeInfo();
            var field = new StringBuilder();
            var index = 0;

            _commonExpression.ReadAnonymousField(_tables, field, map, ref index, newexp, null, _whereCascadeExpression);
            return (map, field.Length > 0 ? field.Remove(0, 2).ToString() : null);
        }
        static ConcurrentDictionary<Type, ConstructorInfo> _dicConstructor = new ConcurrentDictionary<Type, ConstructorInfo>();
        static ConcurrentDictionary<string, GetAllFieldExpressionTreeInfo> _dicGetAllFieldExpressionTree = new ConcurrentDictionary<string, GetAllFieldExpressionTreeInfo>();
        public class GetAllFieldExpressionTreeInfo
        {
            public string Field { get; set; }
            public int FieldCount { get; set; }
            public Func<IFreeSql, DbDataReader, T1> Read { get; set; }
        }
        protected GetAllFieldExpressionTreeInfo GetAllFieldExpressionTreeLevelAll()
        {
            return _dicGetAllFieldExpressionTree.GetOrAdd($"*{string.Join("+", _tables.Select(a => $"{_orm.Ado.DataType}-{a.Table.DbName}-{a.Alias}-{a.Type}"))}", s =>
            {
                var type = _tables.First().Table.TypeLazy ?? _tables.First().Table.Type;
                var ormExp = Expression.Parameter(typeof(IFreeSql), "orm");
                var rowExp = Expression.Parameter(typeof(DbDataReader), "row");
                var returnTarget = Expression.Label(type);
                var retExp = Expression.Variable(type, "ret");
                var dataIndexExp = Expression.Variable(typeof(int), "dataIndex");
                var readExp = Expression.Variable(typeof(Utils.RowInfo), "read");
                var readExpValue = Expression.MakeMemberAccess(readExp, Utils.RowInfo.PropertyValue);
                var readExpDataIndex = Expression.MakeMemberAccess(readExp, Utils.RowInfo.PropertyDataIndex);
                var blockExp = new List<Expression>();
                var ctor = type.GetConstructor(new Type[0]) ?? type.GetConstructors().First();
                blockExp.AddRange(new Expression[] {
                    Expression.Assign(retExp, Expression.New(ctor, ctor.GetParameters().Select(a => Expression.Default(a.ParameterType)))),
                    Expression.Assign(dataIndexExp, Expression.Constant(0))
                });
                //typeof(Topic).GetMethod("get_Type").IsVirtual

                var field = new StringBuilder();
                var dicfield = new Dictionary<string, bool>();
                var tb = _tables.First();
                var index = 0;

                var tborder = new[] { tb }.Concat(_tables.ToArray().Where((a, b) => b > 0).OrderBy(a => a.Alias));
                var tbiindex = 0;
                foreach (var tbi in tborder)
                {
                    if (tbiindex > 0 && tbi.Type == SelectTableInfoType.From) continue;
                    if (tbiindex > 0 && tbi.Alias.StartsWith($"{tb.Alias}__") == false) continue;

                    var typei = tbi.Table.TypeLazy ?? tbi.Table.Type;
                    Expression curExp = retExp;

                    var colidx = 0;
                    foreach (var col in tbi.Table.Columns.Values)
                    {
                        if (index > 0)
                        {
                            field.Append(", ");
                            if (tbiindex > 0 && colidx == 0) field.Append("\r\n");
                        }
                        var quoteName = _commonUtils.QuoteSqlName(col.Attribute.Name);
                        field.Append(_commonUtils.QuoteReadColumn(col.Attribute.MapType, $"{tbi.Alias}.{quoteName}"));
                        ++index;
                        if (dicfield.ContainsKey(quoteName)) field.Append(" as").Append(index);
                        else dicfield.Add(quoteName, true);
                        ++colidx;
                    }
                    tbiindex++;

                    if (tbiindex == 0)
                        blockExp.AddRange(new Expression[] {
                            Expression.Assign(readExp, Expression.Call(Utils.MethodExecuteArrayRowReadClassOrTuple, new Expression[] { Expression.Constant(null, typeof(string)), Expression.Constant(typei), Expression.Constant(null, typeof(int[])), rowExp, dataIndexExp, Expression.Constant(_commonUtils) })),
                            Expression.IfThen(
                                Expression.GreaterThan(readExpDataIndex, dataIndexExp),
                                Expression.Assign(dataIndexExp, readExpDataIndex)
                            ),
                            Expression.IfThen(
                                Expression.NotEqual(readExpValue, Expression.Constant(null)),
                                Expression.Assign(retExp, Expression.Convert(readExpValue, typei))
                            )
                        });
                    else
                    {
                        Expression curExpIfNotNull = Expression.IsTrue(Expression.Constant(true));
                        var curTb = tb;
                        var parentNameSplits = tbi.Alias.Split(new[] { "__" }, StringSplitOptions.None);
                        var iscontinue = false;
                        for (var k = 1; k < parentNameSplits.Length; k++)
                        {
                            var curPropName = parentNameSplits[k];
                            if (curTb.Table.Properties.TryGetValue(parentNameSplits[k], out var tryprop) == false)
                            {
                                k++;
                                curPropName = $"{curPropName}__{parentNameSplits[k]}";
                                if (curTb.Table.Properties.TryGetValue(parentNameSplits[k], out tryprop) == false)
                                {
                                    iscontinue = true;
                                    break;
                                }
                            }
                            curExp = Expression.MakeMemberAccess(curExp, tryprop);
                            if (k + 1 < parentNameSplits.Length)
                                curExpIfNotNull = Expression.AndAlso(curExpIfNotNull, Expression.NotEqual(curExp, Expression.Default(tryprop.PropertyType)));
                            curTb = _tables.Where(a => a.Alias == $"{curTb.Alias}__{curPropName}" && a.Table.Type == tryprop.PropertyType).FirstOrDefault();
                            if (curTb == null)
                            {
                                iscontinue = true;
                                break;
                            }
                        }
                        if (iscontinue) continue;

                        blockExp.Add(
                            Expression.IfThenElse(
                                curExpIfNotNull,
                                Expression.Block(new Expression[] {
                                    Expression.Assign(readExp, Expression.Call(Utils.MethodExecuteArrayRowReadClassOrTuple, new Expression[] { Expression.Constant(null, typeof(string)), Expression.Constant(typei), Expression.Constant(null, typeof(int[])), rowExp, dataIndexExp, Expression.Constant(_commonUtils) })),
                                    Expression.IfThen(
                                        Expression.GreaterThan(readExpDataIndex, dataIndexExp),
                                        Expression.Assign(dataIndexExp, readExpDataIndex)
                                    ),
                                    Expression.IfThenElse(
                                        Expression.NotEqual(readExpValue, Expression.Constant(null)),
                                        Expression.Assign(curExp, Expression.Convert(readExpValue, typei)),
                                        Expression.Assign(curExp, Expression.Constant(null, typei))
                                    )
                                }),
                                Expression.Block(
                                    Expression.Assign(readExpValue, Expression.Constant(null, typeof(object))),
                                    Expression.Assign(dataIndexExp, Expression.Constant(index))
                                )
                            )
                        );
                    }

                    if (tbi.Table.TypeLazy != null)
                        blockExp.Add(
                            Expression.IfThen(
                                Expression.NotEqual(readExpValue, Expression.Constant(null)),
                                Expression.Call(Expression.TypeAs(readExpValue, typei), tbi.Table.TypeLazySetOrm, ormExp)
                            )
                        ); //将 orm 传递给 lazy
                }

                blockExp.AddRange(new Expression[] {
                    Expression.Return(returnTarget, retExp),
                    Expression.Label(returnTarget, Expression.Default(type))
                });
                return new GetAllFieldExpressionTreeInfo
                {
                    Field = field.ToString(),
                    FieldCount = index,
                    Read = Expression.Lambda<Func<IFreeSql, DbDataReader, T1>>(Expression.Block(new[] { retExp, dataIndexExp, readExp }, blockExp), new[] { ormExp, rowExp }).Compile()
                };
            });
        }
        protected GetAllFieldExpressionTreeInfo GetAllFieldExpressionTreeLevel2()
        {
            return _dicGetAllFieldExpressionTree.GetOrAdd(string.Join("+", _tables.Select(a => $"{_orm.Ado.DataType}-{a.Table.DbName}-{a.Alias}-{a.Type}")), s =>
            {
                var tb1 = _tables.First().Table;
                var type = tb1.TypeLazy ?? tb1.Type;
                var props = tb1.Properties;

                var ormExp = Expression.Parameter(typeof(IFreeSql), "orm");
                var rowExp = Expression.Parameter(typeof(DbDataReader), "row");
                var returnTarget = Expression.Label(type);
                var retExp = Expression.Variable(type, "ret");
                var dataIndexExp = Expression.Variable(typeof(int), "dataIndex");
                var readExp = Expression.Variable(typeof(Utils.RowInfo), "read");
                var readExpValue = Expression.MakeMemberAccess(readExp, Utils.RowInfo.PropertyValue);
                var readExpDataIndex = Expression.MakeMemberAccess(readExp, Utils.RowInfo.PropertyDataIndex);
                var blockExp = new List<Expression>();
                var ctor = type.GetConstructor(new Type[0]) ?? type.GetConstructors().First();
                blockExp.AddRange(new Expression[] {
                    Expression.Assign(retExp, Expression.New(ctor, ctor.GetParameters().Select(a => Expression.Default(a.ParameterType)))),
                    Expression.Assign(dataIndexExp, Expression.Constant(0))
                });
                //typeof(Topic).GetMethod("get_Type").IsVirtual

                var field = new StringBuilder();
                var dicfield = new Dictionary<string, bool>();
                var tb = _tables.First();
                var index = 0;
                var otherindex = 0;
                foreach (var prop in props.Values)
                {
                    if (tb.Table.ColumnsByCsIgnore.ContainsKey(prop.Name)) continue;

                    if (tb.Table.ColumnsByCs.TryGetValue(prop.Name, out var col))
                    { //普通字段
                        if (index > 0) field.Append(", ");
                        var quoteName = _commonUtils.QuoteSqlName(col.Attribute.Name);
                        field.Append(_commonUtils.QuoteReadColumn(col.Attribute.MapType, $"{tb.Alias}.{quoteName}"));
                        ++index;
                        if (dicfield.ContainsKey(quoteName)) field.Append(" as").Append(index);
                        else dicfield.Add(quoteName, true);
                    }
                    else
                    {
                        var tb2 = _tables.Where((a, b) => b > 0 &&
                            (a.Type == SelectTableInfoType.InnerJoin || a.Type == SelectTableInfoType.LeftJoin || a.Type == SelectTableInfoType.RightJoin) &&
                            string.IsNullOrEmpty(a.On) == false &&
                            a.Alias.StartsWith($"{tb.Alias}__") && //开头结尾完全匹配
                            a.Alias.EndsWith($"__{prop.Name}") //不清楚会不会有其他情况 求大佬优化
                            ).FirstOrDefault(); //判断 b > 0 防止 parent 递归关系
                        if (tb2 == null && props.Where(pw => pw.Value.PropertyType == prop.PropertyType).Count() == 1)
                            tb2 = _tables.Where((a, b) => b > 0 &&
                                (a.Type == SelectTableInfoType.InnerJoin || a.Type == SelectTableInfoType.LeftJoin || a.Type == SelectTableInfoType.RightJoin) &&
                                string.IsNullOrEmpty(a.On) == false &&
                                a.Table.Type == prop.PropertyType).FirstOrDefault();
                        if (tb2 == null) continue;
                        foreach (var col2 in tb2.Table.Columns.Values)
                        {
                            if (index > 0) field.Append(", ");
                            var quoteName = _commonUtils.QuoteSqlName(col2.Attribute.Name);
                            field.Append(_commonUtils.QuoteReadColumn(col2.Attribute.MapType, $"{tb2.Alias}.{quoteName}"));
                            ++index;
                            ++otherindex;
                            if (dicfield.ContainsKey(quoteName)) field.Append(" as").Append(index);
                            else dicfield.Add(quoteName, true);
                        }
                    }
                    //只读到二级属性
                    var propGetSetMethod = prop.GetSetMethod();
                    Expression readExpAssign = null; //加速缓存
                    if (prop.PropertyType.IsArray) readExpAssign = Expression.New(Utils.RowInfo.Constructor,
                        Utils.GetDataReaderValueBlockExpression(prop.PropertyType, Expression.Call(rowExp, Utils.MethodDataReaderGetValue, dataIndexExp)),
                        //Expression.Call(Utils.MethodGetDataReaderValue, new Expression[] { Expression.Constant(prop.PropertyType), Expression.Call(rowExp, Utils.MethodDataReaderGetValue, dataIndexExp) }),
                        Expression.Add(dataIndexExp, Expression.Constant(1))
                    );
                    else
                    {
                        var proptypeGeneric = prop.PropertyType;
                        if (proptypeGeneric.IsNullableType()) proptypeGeneric = proptypeGeneric.GenericTypeArguments.First();
                        if (proptypeGeneric.IsEnum ||
                            Utils.dicExecuteArrayRowReadClassOrTuple.ContainsKey(proptypeGeneric)) readExpAssign = Expression.New(Utils.RowInfo.Constructor,
                                Utils.GetDataReaderValueBlockExpression(prop.PropertyType, Expression.Call(rowExp, Utils.MethodDataReaderGetValue, dataIndexExp)),
                                //Expression.Call(Utils.MethodGetDataReaderValue, new Expression[] { Expression.Constant(prop.PropertyType), Expression.Call(rowExp, Utils.MethodDataReaderGetValue, dataIndexExp) }),
                                Expression.Add(dataIndexExp, Expression.Constant(1))
                        );
                        else
                        {
                            var propLazyType = _commonUtils.GetTableByEntity(prop.PropertyType)?.TypeLazy ?? prop.PropertyType;
                            readExpAssign = Expression.Call(Utils.MethodExecuteArrayRowReadClassOrTuple, new Expression[] { Expression.Constant(null, typeof(string)), Expression.Constant(propLazyType), Expression.Constant(null, typeof(int[])), rowExp, dataIndexExp, Expression.Constant(_commonUtils) });
                        }
                    }
                    blockExp.AddRange(new Expression[] {
                        Expression.Assign(readExp, readExpAssign),
                        Expression.IfThen(Expression.GreaterThan(readExpDataIndex, dataIndexExp),
                            Expression.Assign(dataIndexExp, readExpDataIndex)),
						//Expression.Call(typeof(Trace).GetMethod("WriteLine", new Type[]{typeof(string)}), Expression.Call(typeof(string).GetMethod("Concat", new Type[]{typeof(object) }), readExpValue)),

						tb1.TypeLazy != null ?
                            Expression.IfThenElse(
                                Expression.NotEqual(readExpValue, Expression.Constant(null)),
                                Expression.Call(retExp, propGetSetMethod, Expression.Convert(readExpValue, prop.PropertyType)),
                                Expression.Call(retExp, propGetSetMethod, Expression.Convert(Utils.GetDataReaderValueBlockExpression(prop.PropertyType, Expression.Constant(null)), prop.PropertyType))
                            ) :
                            Expression.IfThen(
                                Expression.NotEqual(readExpValue, Expression.Constant(null)),
                                Expression.Call(retExp, propGetSetMethod, Expression.Convert(readExpValue, prop.PropertyType))
                            )
                    });
                }
                if (otherindex == 0)
                { //不读导航属性，优化单表读取性能
                    blockExp.Clear();
                    blockExp.AddRange(new Expression[] {
                        Expression.Assign(dataIndexExp, Expression.Constant(0)),
                        Expression.Assign(readExp, Expression.Call(Utils.MethodExecuteArrayRowReadClassOrTuple, new Expression[] { Expression.Constant(null, typeof(string)), Expression.Constant(type), Expression.Constant(null, typeof(int[])), rowExp, dataIndexExp, Expression.Constant(_commonUtils) })),
                        Expression.IfThen(
                            Expression.NotEqual(readExpValue, Expression.Constant(null)),
                            Expression.Assign(retExp, Expression.Convert(readExpValue, type))
                        )
                    });
                }
                if (tb1.TypeLazy != null)
                    blockExp.Add(
                        Expression.IfThen(
                            Expression.NotEqual(readExpValue, Expression.Constant(null)),
                            Expression.Call(retExp, tb1.TypeLazySetOrm, ormExp)
                        )
                    ); //将 orm 传递给 lazy
                blockExp.AddRange(new Expression[] {
                    Expression.Return(returnTarget, retExp),
                    Expression.Label(returnTarget, Expression.Default(type))
                });
                return new GetAllFieldExpressionTreeInfo
                {
                    Field = field.ToString(),
                    Read = Expression.Lambda<Func<IFreeSql, DbDataReader, T1>>(Expression.Block(new[] { retExp, dataIndexExp, readExp }, blockExp), new[] { ormExp, rowExp }).Compile()
                };
            });
        }
        protected (ReadAnonymousTypeInfo map, string field) GetAllFieldReflection()
        {
            var tb1 = _tables.First().Table;
            var type = tb1.Type;
            var constructor = _dicConstructor.GetOrAdd(type, s => type.GetConstructor(new Type[0]));
            var map = new ReadAnonymousTypeInfo { Consturctor = constructor, ConsturctorType = ReadAnonymousTypeInfoConsturctorType.Properties };

            var field = new StringBuilder();
            var dicfield = new Dictionary<string, bool>();
            var tb = _tables.First();
            var index = 0;
            var ps = tb1.Properties;
            foreach (var p in ps.Values)
            {
                var child = new ReadAnonymousTypeInfo { Property = p, CsName = p.Name };
                if (tb.Table.ColumnsByCs.TryGetValue(p.Name, out var col))
                { //普通字段
                    if (index > 0) field.Append(", ");
                    var quoteName = _commonUtils.QuoteSqlName(col.Attribute.Name);
                    field.Append(_commonUtils.QuoteReadColumn(col.Attribute.MapType, $"{tb.Alias}.{quoteName}"));
                    ++index;
                    if (dicfield.ContainsKey(quoteName)) field.Append(" as").Append(index);
                    else dicfield.Add(quoteName, true);
                }
                else
                {
                    var tb2 = _tables.Where(a => a.Table.Type == p.PropertyType && a.Alias.Contains(p.Name)).FirstOrDefault();
                    if (tb2 == null && ps.Where(pw => pw.Value.PropertyType == p.PropertyType).Count() == 1) tb2 = _tables.Where(a => a.Table.Type == p.PropertyType).FirstOrDefault();
                    if (tb2 == null) continue;
                    child.Consturctor = tb2.Table.Type.GetConstructor(new Type[0]);
                    child.ConsturctorType = ReadAnonymousTypeInfoConsturctorType.Properties;
                    foreach (var col2 in tb2.Table.Columns.Values)
                    {
                        if (index > 0) field.Append(", ");
                        var quoteName = _commonUtils.QuoteSqlName(col2.Attribute.Name);
                        field.Append(_commonUtils.QuoteReadColumn(col2.Attribute.MapType, $"{tb2.Alias}.{quoteName}"));
                        ++index;
                        if (dicfield.ContainsKey(quoteName)) field.Append(" as").Append(index);
                        else dicfield.Add(quoteName, true);
                        child.Childs.Add(new ReadAnonymousTypeInfo
                        {
                            Property = tb2.Table.Type.GetProperty(col2.CsName, BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.Instance),
                            CsName = col2.CsName
                        });
                    }
                }
                map.Childs.Add(child);
            }
            return (map, field.ToString());
        }

        protected List<Dictionary<Type, string>> GetTableRuleUnions()
        {
            var unions = new List<Dictionary<Type, string>>();
            var trs = _tableRules.Any() ? _tableRules : new List<Func<Type, string, string>>(new[] { new Func<Type, string, string>((type, oldname) => oldname) });
            foreach (var tr in trs)
            {
                var dict = new Dictionary<Type, string>();
                foreach (var tb in _tables)
                {
                    if (tb.Type == SelectTableInfoType.Parent) continue;
                    if (dict.ContainsKey(tb.Table.Type)) continue;
                    var name = tr?.Invoke(tb.Table.Type, tb.Table.DbName);
                    if (string.IsNullOrEmpty(name)) name = tb.Table.DbName;
                    else
                    {
                        if (name.IndexOf(' ') == -1) //还可以这样：select.AsTable((a, b) => "(select * from tb_topic where clicks > 10)").Page(1, 10).ToList()
                        {
                            if (_orm.CodeFirst.IsSyncStructureToLower) name = name.ToLower();
                            if (_orm.CodeFirst.IsSyncStructureToUpper) name = name.ToUpper();
                        }
                    }
                    dict.Add(tb.Table.Type, name);
                }
                unions.Add(dict);
            }
            return unions;
        }
        public TSelect AsTable(Func<Type, string, string> tableRule)
        {
            if (tableRule != null) _tableRules.Add(tableRule);
            return this as TSelect;
        }
        public TSelect AsType(Type entityType)
        {
            if (entityType == typeof(object)) throw new Exception("ISelect.AsType 参数不支持指定为 object");
            if (entityType == _tables[0].Table.Type) return this as TSelect;
            var newtb = _commonUtils.GetTableByEntity(entityType);
            _tables[0].Table = newtb ?? throw new Exception("ISelect.AsType 参数错误，请传入正确的实体类型");
            if (_orm.CodeFirst.IsAutoSyncStructure) _orm.CodeFirst.SyncStructure(entityType);
            return this as TSelect;
        }
        public abstract string ToSql(string field = null);

        public TSelect Where(string sql, object parms = null) => this.WhereIf(true, sql, parms);
        public TSelect WhereIf(bool condition, string sql, object parms = null)
        {
            if (condition == false || string.IsNullOrEmpty(sql)) return this as TSelect;
            var args = new Aop.WhereEventArgs(sql, parms);
            _orm.Aop.Where?.Invoke(this, new Aop.WhereEventArgs(sql, parms));
            if (args.IsCancel == true) return this as TSelect;

            _where.Append(" AND (").Append(sql).Append(")");
            if (parms != null) _params.AddRange(_commonUtils.GetDbParamtersByObject(sql, parms));
            return this as TSelect;
        }
        #region common

        protected TMember InternalAvg<TMember>(Expression exp) => this.ToList<TMember>($"avg({_commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, exp, true, null)})").FirstOrDefault();
        async protected Task<TMember> InternalAvgAsync<TMember>(Expression exp) => (await this.ToListAsync<TMember>($"avg({_commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, exp, true, null)})")).FirstOrDefault();
        protected TMember InternalMax<TMember>(Expression exp) => this.ToList<TMember>($"max({_commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, exp, true, null)})").FirstOrDefault();
        async protected Task<TMember> InternalMaxAsync<TMember>(Expression exp) => (await this.ToListAsync<TMember>($"max({_commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, exp, true, null)})")).FirstOrDefault();
        protected TMember InternalMin<TMember>(Expression exp) => this.ToList<TMember>($"min({_commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, exp, true, null)})").FirstOrDefault();
        async protected Task<TMember> InternalMinAsync<TMember>(Expression exp) => (await this.ToListAsync<TMember>($"min({_commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, exp, true, null)})")).FirstOrDefault();
        protected TMember InternalSum<TMember>(Expression exp) => this.ToList<TMember>($"sum({_commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, exp, true, null)})").FirstOrDefault();
        async protected Task<TMember> InternalSumAsync<TMember>(Expression exp) => (await this.ToListAsync<TMember>($"sum({_commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, exp, true, null)})")).FirstOrDefault();

        protected ISelectGrouping<TKey, TValue> InternalGroupBy<TKey, TValue>(Expression columns)
        {
            var map = new ReadAnonymousTypeInfo();
            var field = new StringBuilder();
            var index = -10000; //临时规则，不返回 as1

            _commonExpression.ReadAnonymousField(_tables, field, map, ref index, columns, null, _whereCascadeExpression);
            this.GroupBy(field.Length > 0 ? field.Remove(0, 2).ToString() : null);
            return new SelectGroupingProvider<TKey, TValue>(this, map, _commonExpression, _tables);
        }
        protected TSelect InternalJoin(Expression exp, SelectTableInfoType joinType)
        {
            _commonExpression.ExpressionJoinLambda(_tables, joinType, exp, null, _whereCascadeExpression);
            return this as TSelect;
        }
        protected TSelect InternalJoin<T2>(Expression exp, SelectTableInfoType joinType)
        {
            var tb = _commonUtils.GetTableByEntity(typeof(T2));
            if (tb == null) throw new ArgumentException("T2 类型错误");
            _tables.Add(new SelectTableInfo { Table = tb, Alias = $"IJ{_tables.Count}", On = null, Type = joinType });
            _commonExpression.ExpressionJoinLambda(_tables, joinType, exp, null, _whereCascadeExpression);
            return this as TSelect;
        }
        protected TSelect InternalOrderBy(Expression column) => this.OrderBy(_commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, column, true, null));
        protected TSelect InternalOrderByDescending(Expression column) => this.OrderBy($"{_commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, column, true, null)} DESC");

        protected List<TReturn> InternalToList<TReturn>(Expression select) => this.ToListMapReader<TReturn>(this.GetExpressionField(select));
        protected Task<List<TReturn>> InternalToListAsync<TReturn>(Expression select) => this.ToListMapReaderAsync<TReturn>(this.GetExpressionField(select));
        protected string InternalToSql<TReturn>(Expression select)
        {
            var af = this.GetExpressionField(select);
            return this.ToSql(af.field);
        }

        protected DataTable InternalToDataTable(Expression select)
        {
            var sql = this.InternalToSql<int>(select);
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            DataTable ret = null;
            Exception exception = null;
            try
            {
                ret = _orm.Ado.ExecuteDataTable(_connection, _transaction, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            return ret;
        }
        async protected Task<DataTable> InternalToDataTableAsync(Expression select)
        {
            var sql = this.InternalToSql<int>(select);
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_tables[0].Table.Type, _tables[0].Table, Aop.CurdType.Select, sql, dbParms);
            _orm.Aop.CurdBefore?.Invoke(this, before);
            DataTable ret = null;
            Exception exception = null;
            try
            {
                ret = await _orm.Ado.ExecuteDataTableAsync(_connection, _transaction, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfter?.Invoke(this, after);
            }
            return ret;
        }

        protected TReturn InternalToAggregate<TReturn>(Expression select)
        {
            var map = new ReadAnonymousTypeInfo();
            var field = new StringBuilder();
            var index = 0;

            _commonExpression.ReadAnonymousField(_tables, field, map, ref index, select, null, _whereCascadeExpression);
            return this.ToListMapReader<TReturn>((map, field.Length > 0 ? field.Remove(0, 2).ToString() : null)).FirstOrDefault();
        }
        async protected Task<TReturn> InternalToAggregateAsync<TReturn>(Expression select)
        {
            var map = new ReadAnonymousTypeInfo();
            var field = new StringBuilder();
            var index = 0;

            _commonExpression.ReadAnonymousField(_tables, field, map, ref index, select, null, _whereCascadeExpression);
            return (await this.ToListMapReaderAsync<TReturn>((map, field.Length > 0 ? field.Remove(0, 2).ToString() : null))).FirstOrDefault();
        }

        protected TSelect InternalWhere(Expression exp) => exp == null ? this as TSelect : this.Where(_commonExpression.ExpressionWhereLambda(_tables, exp, null, _whereCascadeExpression));
        #endregion
    }
}