using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using Gm_WMS.DataAccess.DataService;

namespace Stone.Entity
{
    public class EntityBase : IDisposable
    {
        public string TableName = string.Empty;
        public DataTable Table;
        public LocalDBService db;

        public string sql = string.Empty;

        #region 构造函数和初始化代码
        public EntityBase()
        {
        }

        public void Init()
        {
            if (db == null)
            {
                db = new LocalDBService();
            }
            Table = new DataTable();
            Table.TableName = TableName;

            //初始化时执行一个SQL语句，用于获取Table的结构
            sql = "select top 0 * from " + TableName;
            Table = db.Exec_DataSet(sql).Tables[0];
        }

        #endregion

        #region 获取数据
        public virtual DataSet GetData()
        {
            sql = "select * from " + TableName;
            return db.Exec_DataSet(sql);
        }

        public virtual DataSet GetData(string strwhere)
        {
            sql = "select * from " + TableName + " where " + strwhere;
            return db.Exec_DataSet(sql);
        }

        public virtual DataSet GetData(string fields, int ID)
        {
            if (fields == "") fields = "*";
            sql = "select " + fields + " from " + TableName + " where id=" + ID;
            return db.Exec_DataSet(sql);
        }

        public virtual DataSet GetData(string fields, string orderby)
        {
            if (fields == "") fields = "*";
            sql = "select " + fields + " from " + TableName + " order by " + orderby;
            return db.Exec_DataSet(sql);
        }

        public virtual DataSet GetData(string fields, string strwhere, string orderby)
        {
            if (fields == "") fields = "*";
            sql = "select " + fields + " from " + TableName + " where " + strwhere + " order by " + orderby;
            return db.Exec_DataSet(sql);
        }

        public virtual DataSet GetDataDistinct(string fields, string strwhere, string orderby)
        {
            sql = "select Distinct " + fields + " from " + TableName + " where " + strwhere + " order by " + orderby;
            return db.Exec_DataSet(sql);
        }

        #endregion

        #region 获取分页数据

        public virtual DataSet GetDataLimit(int rows1, int rows2)
        {
//            string sql = @"
//                select {0} from (
//                select ROW_NUMBER()  over(order by {1}) as rows_number_9999999, {0} from {2} where {5}
//                ) as query_temp_table_9999999 where rows_number_9999999 between {3} and {4} and ({5})
//            ";

            string sql = @"
                select {0} from (
                select ROW_NUMBER()  over(order by {1}) as rows_number_9999999, {0} from {2} where {5}
                ) as query_temp_table_9999999 where rows_number_9999999 between {3} and {4}
            ";

            object[] obj = new object[6];
            obj[0] = "*";
            obj[1] = "[ID] asc";
            obj[2] = TableName;
            obj[3] = rows1;
            obj[4] = rows2;
            obj[5] = "1=1";
            sql = string.Format(sql, obj);

            DataSet dsData = db.Exec_DataSet(sql);
            dsData.Tables[0].Columns.Remove("rows_number_9999999");

            return dsData;

        }

        public virtual DataSet GetDataLimit(int rows1, int rows2, string strwhere)
        {
//            string sql = @"
//                select {0} from (
//                select ROW_NUMBER()  over(order by {1}) as rows_number_9999999, {0} from {2} where {5}
//                ) as query_temp_table_9999999 where rows_number_9999999 between {3} and {4} and ({5})
//            ";

            string sql = @"
                select {0} from (
                select ROW_NUMBER()  over(order by {1}) as rows_number_9999999, {0} from {2} where {5}
                ) as query_temp_table_9999999 where rows_number_9999999 between {3} and {4}
            ";

            object[] obj = new object[6];
            obj[0] = "*";
            obj[1] = "[ID] asc";
            obj[2] = TableName;
            obj[3] = rows1;
            obj[4] = rows2;
            obj[5] = strwhere;
            sql = string.Format(sql, obj);

            DataSet dsData = db.Exec_DataSet(sql);
            dsData.Tables[0].Columns.Remove("rows_number_9999999");

            return dsData;

        }

        public virtual DataSet GetDataLimit(int rows1, int rows2, string fields, string orderby)
        {
            if (fields == "") fields = "*";

//            string sql = @"
//                select {0} from (
//                select ROW_NUMBER()  over(order by {1}) as rows_number_9999999, {0} from {2} where {5}
//                ) as query_temp_table_9999999 where rows_number_9999999 between {3} and {4} and ({5})
//            ";

            string sql = @"
                            select {0} from (
                            select ROW_NUMBER()  over(order by {1}) as rows_number_9999999, {0} from {2} where {5}
                            ) as query_temp_table_9999999 where rows_number_9999999 between {3} and {4}
                        ";

            object[] obj = new object[6];
            obj[0] = fields;
            obj[1] = orderby;
            obj[2] = TableName;
            obj[3] = rows1;
            obj[4] = rows2;
            obj[5] = "1=1";
            sql = string.Format(sql, obj);

            DataSet dsData = db.Exec_DataSet(sql);
            dsData.Tables[0].Columns.Remove("rows_number_9999999");

            return dsData;

        }

        public virtual DataSet GetDataLimit(int rows1, int rows2, string fields, string strwhere, string orderby)
        {
            if (fields == "") fields = "*";

//            string sql = @"
//                select {0} from (
//                select ROW_NUMBER()  over(order by {1}) as rows_number_9999999, {0} from {2} where {5}
//                ) as query_temp_table_9999999 where rows_number_9999999 between {3} and {4} and ({5})
//            ";

            string sql = @"
                            select {0} from (
                            select ROW_NUMBER()  over(order by {1}) as rows_number_9999999, {0} from {2} where {5}
                            ) as query_temp_table_9999999 where rows_number_9999999 between {3} and {4}
                        ";

            object[] obj = new object[6];
            obj[0] = fields;
            obj[1] = orderby;
            obj[2] = TableName;
            obj[3] = rows1;
            obj[4] = rows2;
            obj[5] = strwhere;
            sql = string.Format(sql, obj);

            DataSet dsData = db.Exec_DataSet(sql);
            dsData.Tables[0].Columns.Remove("rows_number_9999999");

            return dsData;
        }

        #endregion

        #region 获取不重复的数据

        public virtual DataTable GetDistinctData(string Fields)
        {
            string sql = "select Distinct [" + Fields + "] from " + TableName;
            return db.Exec_DataSet(sql).Tables[0];
        }

        #endregion

        #region 增、删、修
        public virtual DataRow Add(DataRow drData)
        {
            DataRow drResult = null;
            sql = "insert into {0}({1}) values({2});select @@Identity";
            string fields = "";
            string values = "";
            foreach (DataColumn dc in Table.Columns)
            {
                if (dc.ColumnName.ToUpper() != "ID")
                {
                    if (drData[dc.ColumnName] is DBNull) continue;

                    fields += "[" + dc.ColumnName + "]" + ",";

                    if ((dc.DataType.Name == "Int32" || dc.DataType.Name == "Decimal") && drData[dc.ColumnName].ToString() == "")
                    {
                        values += "'0',";
                    }
                    else if (dc.DataType.Name == "DateTime" && drData[dc.ColumnName].ToString() == "")
                    {
                        values += "getdate(),";
                    }
                    else
                    {
                        values += "'" + drData[dc.ColumnName] + "',";
                    }
                }
            }
            if (fields.Length > 1) fields = fields.Substring(0, fields.Length - 1);
            if (values.Length > 1) values = values.Substring(0, values.Length - 1);

            object[] o = new object[3];
            o[0] = TableName;
            o[1] = fields;
            o[2] = values;

            sql = string.Format(sql, o);

            string id = db.Exec_DataSet(sql).Tables[0].Rows[0][0].ToString();
            sql = "select * from " + TableName + " where id=" + id;
            drResult = db.Exec_DataSet(sql).Tables[0].Rows[0];
            return drResult;
        }

        public virtual DataRow Edit(DataRow drData)
        {
            DataRow drResult = null;
            sql = "update {0} set {1} where id={2}";
            string fields = "";
            string values = "";
            foreach (DataColumn dc in Table.Columns)
            {
                if (dc.ColumnName.ToUpper() != "ID")
                {
                    if (drData[dc.ColumnName] is DBNull) continue;

                    if ((dc.DataType.Name == "Int32" || dc.DataType.Name == "Decimal") && drData[dc.ColumnName].ToString() == "")
                    {
                        values = "'0'";
                    }
                    else if (dc.DataType.Name == "DateTime" && drData[dc.ColumnName].ToString() == "")
                    {
                        values = "getdate()";
                    }
                    else
                    {
                        values = "'" + drData[dc.ColumnName] + "'";
                    }

                    fields += "[" + dc.ColumnName + "]=" + values + ",";
                }
            }
            if (fields.Length > 1) fields = fields.Substring(0, fields.Length - 1);

            object[] o = new object[3];
            o[0] = TableName;
            o[1] = fields;
            o[2] = drData["id"];

            sql = string.Format(sql, o);

            db.Exec_NonQuery(sql);

            string id = drData["id"].ToString();
            sql = "select * from " + TableName + " where id=" + id;

            drResult = db.Exec_DataSet(sql).Tables[0].Rows[0];
            return drResult;
        }

        public virtual void Edit(string SetFields, string strWhere)
        {
            sql = "update {0} set {1} where {2}";

            object[] o = new object[3];
            o[0] = TableName;
            o[1] = SetFields;
            o[2] = strWhere;
            sql = string.Format(sql, o);

            db.Exec_NonQuery(sql);
        }

        public virtual void Del(DataRow drData)
        {
            string ID = drData["id"].ToString();
            sql = "delete from " + TableName + " where ID=" + ID;
            db.Exec_NonQuery(sql);
        }

        public virtual void Del(int ID)
        {
            sql = "delete from " + TableName + " where ID=" + ID;
            db.Exec_NonQuery(sql);
        }

        public virtual void Del(string strWhere)
        {
            sql = "delete from " + TableName + " where " + strWhere;
            db.Exec_NonQuery(sql);
        }
        #endregion

        #region 获取系统当前时间
        public DateTime GetDateTime()
        {
            return Convert.ToDateTime(db.Exec_DataSet("select getdate() as d").Tables[0].Rows[0]["d"]);
        }
        #endregion

        #region 释放对象
        public void Dispose()
        {
            if (Table != null) Table.Dispose();
        }
        #endregion

    }
}