using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.OleDb;

namespace KHSCALE_TP
{
    public class U3Database
    {
        private OleDbConnection mCN = null;
        private OleDbCommand mCmd = null;

        public bool SetSqlServer()
        {
            try
            {
                mCN = new OleDbConnection();
                mCN.ConnectionString = U3Config.m_SqlConnStr;
                mCN.Open();
                return true;
            }
            catch (Exception ex)
            {
                U3Util.ErrorLog("Can't connect to database." + Environment.NewLine + ex.Message);
                return false;
            }
        }

        public DataTable OpenSQL(string strSQL)
        {
            DataTable retTable = new DataTable();

            try
            {
                mCN = new OleDbConnection();
                mCN.ConnectionString = U3Config.m_SqlConnStr;
                mCN.Open();

                mCmd = new OleDbCommand(strSQL, mCN);
                OleDbDataAdapter da = new OleDbDataAdapter(mCmd);
                da.Fill(retTable);
            }
            catch (Exception ex)
            {
                U3Util.ErrorLog(strSQL);
                U3Util.ErrorLog(ex.Message);
            }
            finally
            {
                if (mCN != null) mCN.Close();
            }
            return retTable;
        }


        public DataSet OpenSQLSet(string strSQL)
        {
            DataSet retTable = new DataSet();

            try
            {
                mCN = new OleDbConnection();
                mCN.ConnectionString = U3Config.m_SqlConnStr;
                mCN.Open();

                mCmd = new OleDbCommand(strSQL, mCN);
                OleDbDataAdapter da = new OleDbDataAdapter(mCmd);
                da.Fill(retTable);
            }
            catch (Exception ex)
            {
                U3Util.ErrorLog(strSQL);
                U3Util.ErrorLog(ex.Message);
            }
            finally
            {
                if (mCN != null) mCN.Close();
            }
            return retTable;
        }

        public int ExcuteSql(string strSql)
        {
            try
            {
                mCN = new OleDbConnection();
                mCN.ConnectionString = U3Config.m_SqlConnStr;
                mCN.Open();

                mCmd = new OleDbCommand(strSql, mCN);
                int iResult = mCmd.ExecuteNonQuery();

                return iResult;
            }
            catch (Exception ex)
            {
                U3Util.ErrorLog(strSql);
                U3Util.ErrorLog(ex.Message);
                return 0;
            }
            finally
            {
                if (mCN != null) mCN.Close();
            }
        }

        public bool ExcuteSqls(List<string> strSqls)
        {
            string strMsg = "";
            return ExcuteSqls(strSqls, out strMsg);
        }

        public bool ExcuteSqls(List<string> strSqls, out string strMessage)
        {
            string strSQL = string.Empty;
            try
            {
                mCN = new OleDbConnection();
                mCN.ConnectionString = U3Config.m_SqlConnStr;
                mCN.Open();

                mCmd = new OleDbCommand();
                mCmd.Connection = mCN;
            }
            catch (Exception ex)
            {
                U3Util.ErrorLog(ex.Message);
                if (mCN != null) mCN.Close();
                strMessage = "DB접속 오류: " + ex.Message;
                return false;
            }

            int count = 0;
            foreach (string strSql in strSqls)
            {
                strSQL = strSql;
                try
                {
                    mCmd.CommandText = strSql;
                    mCmd.ExecuteNonQuery();
                    count++;
                }
                catch (Exception ex)
                {
                    U3Util.ErrorLog(strSQL);
                    U3Util.ErrorLog(ex.Message);
                }
            }
            if (mCN != null) mCN.Close();
            strMessage = string.Format("SQL 실행 완료({0}건 실행, {1}건 성공)", strSqls.Count, count);
            return true;
        }
    }
}