using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.ServiceModel;
using System.ServiceModel.Channels;
using BP.DA;
using System.Data;
using System.Data.Odbc;
using System.Data.OleDb;
using System.IO;
using System.Text;

namespace BP.Difference
{
    public class DA_DbLoad
    {
        public static string GenerFirstTableName(string fileName)
        {
            return GenerTableNameByIndex(fileName, 0);
        }
        public static string GenerTableNameByIndex(string fileName, int index)
        {
            String[] excelSheets = GenerTableNames(fileName);
            if (excelSheets != null)
                return excelSheets[index];

            if (excelSheets.Length < index)
                throw new Exception("err@table的索引号错误" + index + "最大索引号为:" + excelSheets.Length);

            return null;
        }
        public static string[] GenerTableNames(string fileName)
        {
            try
            {
                string strConn = "Provider=Microsoft.Jet.Oledb.4.0;Data Source=" + fileName + ";Extended Properties='Excel 8.0;HDR=Yes;IMEX=1;'";
                if (fileName.ToLower().Contains(".xlsx"))
                    strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";

                OleDbConnection con = new OleDbConnection(strConn);
                con.Open();

                //计算出有多少个工作表sheet   
                DataTable dt = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
                if (dt == null)  return null;

                String[] excelSheets = new String[dt.Rows.Count];
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    excelSheets[i] = dt.Rows[i]["TABLE_NAME"].ToString();
                }

                con.Close();
                con.Dispose();
                return excelSheets;
            }
            catch (Exception ex)
            {
                throw new Exception("读取文件期间出现错误:[" + fileName + "]" + ex.Message);
            }
        }
        /// <summary>
        /// 删除表中的空数据行
        /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static DataTable DeleteEmptyRows(DataTable dt)
        {
            List<DataRow> removelist = new List<DataRow>();
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                bool rowdataisnull = true;
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    if (!string.IsNullOrEmpty(dt.Rows[i][j].ToString().Trim()))
                    {

                        rowdataisnull = false;
                    }
                }
                if (rowdataisnull)
                {
                    removelist.Add(dt.Rows[i]);
                }

            }
            for (int i = 0; i < removelist.Count; i++)
            {
                dt.Rows.Remove(removelist[i]);
            }

            return dt;
        }
        public static DataTable ReadExcelFileToDataTableBySQL(string filePath, string tableName)
        {
            string sql = "SELECT * FROM [" + tableName + "]";
            DataTable dt = new DataTable("dt");

            string typ = System.IO.Path.GetExtension(filePath).ToLower();
            string strConn;
            switch (typ.ToLower())
            {
                case ".xls":
                    if (sql == null)
                    {
                        sql = "SELECT * FROM [" + GenerFirstTableName(filePath) + "]";
                    }

                    strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source =" + filePath + ";Extended Properties=Excel 8.0";
                    System.Data.OleDb.OleDbConnection conn = new OleDbConnection(strConn);
                    OleDbDataAdapter ada = new OleDbDataAdapter(sql, conn);
                    try
                    {
                        conn.Open();
                        ada.Fill(dt);
                        dt.TableName = Path.GetFileNameWithoutExtension(filePath);
                    }
                    catch (System.Exception ex)
                    {
                        conn.Close();
                        throw ex;//(ex.Message);
                    }
                    conn.Close();
                    break;
                case ".xlsx":
                    if (sql == null)
                        sql = "SELECT * FROM [" + GenerFirstTableName(filePath) + "]";
                    try
                    {
                        strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filePath + ";Extended Properties=\"Excel 12.0 Xml;HDR=YES\"";
                        System.Data.OleDb.OleDbConnection conn121 = new OleDbConnection(strConn);
                        OleDbDataAdapter ada91 = new OleDbDataAdapter(sql, conn121);
                        conn121.Open();
                        ada91.Fill(dt);
                        dt.TableName = Path.GetFileNameWithoutExtension(filePath);
                        conn121.Close();
                        ada91.Dispose();
                    }
                    catch (System.Exception ex1)
                    {
                        try
                        {
                            strConn = "Microsoft.ACE.OLEDB.12.0;Data Source=" + filePath + ";Extended Properties=\"Excel 12.0 Xml;HDR=YES;IMEX=1\"";
                            System.Data.OleDb.OleDbConnection conn1215 = new OleDbConnection(strConn);
                            OleDbDataAdapter ada919 = new OleDbDataAdapter(sql, conn1215);
                            ada919.Fill(dt);
                            dt.TableName = Path.GetFileNameWithoutExtension(filePath);
                            ada919.Dispose();
                            conn1215.Close();
                        }
                        catch
                        {

                        }
                        throw ex1;//(ex.Message);
                    }
                    break;
                case ".dbf":
                    strConn = "Driver={Microsoft dBASE Driver (*.DBF)};DBQ=" + System.IO.Path.GetDirectoryName(filePath) + "\\"; //+FilePath;//
                    OdbcConnection conn1 = new OdbcConnection(strConn);
                    OdbcDataAdapter ada1 = new OdbcDataAdapter(sql, conn1);
                    conn1.Open();
                    try
                    {
                        ada1.Fill(dt);
                    }
                    catch//(System.Exception ex)
                    {
                        try
                        {
                            int sel = ada1.SelectCommand.CommandText.ToLower().IndexOf("select") + 6;
                            int from = ada1.SelectCommand.CommandText.ToLower().IndexOf("from");
                            ada1.SelectCommand.CommandText = ada1.SelectCommand.CommandText.Remove(sel, from - sel);
                            ada1.SelectCommand.CommandText = ada1.SelectCommand.CommandText.Insert(sel, " top 10 * ");
                            ada1.Fill(dt);
                            dt.TableName = "error";
                        }
                        catch (System.Exception ex)
                        {
                            conn1.Close();
                            throw new Exception("读取DBF数据失败！" + ex.Message + " SQL:" + sql);
                        }
                    }
                    conn1.Close();
                    break;
                default:
                    break;
            }
            return DeleteEmptyRows(dt);
        }
    }

}