using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using ICSSoft.Base.Config.AppConfig;
using ICSSoft.Base.Config.DBHelper;
using Oracle.ManagedDataAccess.Client;
using System.Security.Cryptography;
using System.IO;
using System.Configuration;

namespace NFine.Data.Extensions
{
    public class DBHelper_Oracle
    {
        public static string DBServerIP = "";
        public static string OracleSID = "";
        public static string DBUserName = "";
        public static string DBPassword = "";

        public static OracleCommand cmd = null;
        public static OracleConnection conn = null;
        public static string connstr = "[DB.PLM]";

        public DBHelper_Oracle()
        { }
        #region 建立Oracle数据库连接对象
        /// <returns>返回一个数据库连接的OracleConnection对象</returns>   
        public static OracleConnection init()
        {
            try
            {
                GetDataBaseConnect();
                string connstr = "User Id={2};Password={3};Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST={0})(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME={1})))";
                connstr = string.Format(connstr, DBServerIP, OracleSID, DBUserName, DBPassword);
                conn = new OracleConnection(connstr);
                if (conn.State != ConnectionState.Open)
                {
                    conn.Open();
                }
            }
            catch (Exception e)
            {
                throw new Exception(e.Message.ToString());
            }
            return conn;
        }
        #endregion


        #region 获取数据源连接符
        /// <summary>
        /// 数据源ID（GUID)
        /// </summary>
        /// <param name="dbId"></param>
        /// <returns></returns>
        public static void GetDataBaseConnect()
        {
            string PWD = "";
            string sql = @"select DBIpAddress,DBName,DBUser,DBPwd from [ICSMES_WXZNSys].dbo.sys_DataBase
                         WHERE DBSourceName='ORL'";
            DataTable data = DBHelper.ExecuteDataset(ConfigurationManager.ConnectionStrings["connstr"].ConnectionString, CommandType.Text, sql).Tables[0];
            if (data.Rows.Count != 0)
            {
                DBServerIP = data.Rows[0]["DBIpAddress"].ToString();
                OracleSID = data.Rows[0]["DBName"].ToString();
                DBUserName = data.Rows[0]["DBUser"].ToString();
                PWD = FromMd5(data.Rows[0]["DBPwd"].ToString());
                DBPassword = PWD;
            }
        }
        #endregion
        #region 设置OracleCommand对象
        /// <param name="cmd">OracleCommand对象 </param>   
        /// <param name="cmdText">命令文本</param>   
        /// <param name="cmdType">命令类型</param>   
        /// <param name="cmdParms">参数集合</param>   
        private static void SetCommand(OracleCommand cmd, string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            cmd.CommandType = cmdType;
            if (cmdParms != null)
            {
                cmd.Parameters.AddRange(cmdParms);
            }
        }
        #endregion
        #region 执行相应的Oracle sql语句，返回相应的DataSet对象
        /// <param name="sqlstr">sql语句</param>   
        /// <returns>返回相应的DataSet对象</returns>   
        public static DataSet GetDataSet(string sqlstr)
        {
            DataSet set = new DataSet();
            try
            {
                init();
                OracleDataAdapter adp = new OracleDataAdapter(sqlstr, conn);
                adp.Fill(set);
                conn.Close();
            }
            catch (Exception e)
            {
                throw new Exception(e.Message.ToString());
            }
            return set;
        }
        #endregion
        #region 执行sql语句，返回DataSet对象
        /// <param name="sqlstr">sql语句</param>   
        /// <param name="tableName">表名</param>   
        /// <returns>返回DataSet对象</returns>   
        public static DataSet GetDataSet(string sqlstr, string tableName)
        {
            DataSet set = new DataSet();
            try
            {
                init();
                OracleDataAdapter adp = new OracleDataAdapter(sqlstr, conn);
                adp.Fill(set, tableName);
                conn.Close();
            }
            catch (Exception e)
            {
                throw new Exception(e.Message.ToString());
            }
            return set;
        }
        #endregion
        #region 执行不带参数的sql语句，返回受影响的行数
        /// <param name="cmdstr">增，删，改sql语句</param>   
        /// <returns>返回受影响的行数</returns>   
        public static int ExecuteNonQuery(string cmdText)
        {
            int count;
            try
            {
                init();
                cmd = new OracleCommand(cmdText, conn);
                count = cmd.ExecuteNonQuery();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return count;
        }
        #endregion
        #region 执行带参数的Oracle sql语句或存储过程，返回行数
        /// <param name="cmdText">带参数的sql语句和存储过程名</param>   
        /// <param name="cmdType">命令类型</param>   
        /// <param name="cmdParms">参数集合</param>   
        /// <returns>返回受影响的行数</returns>   
        public static int ExecuteNonQuery(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            int count;
            try
            {
                init();
                cmd = new OracleCommand();
                SetCommand(cmd, cmdText, cmdType, cmdParms);
                count = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return count;
        }
        #endregion
        #region 执行不带参数sql语句，返回一个从数据源读取数据的OracleDataReader对象
        /// <param name="cmdstr">相应的sql语句</param>   
        /// <returns>返回一个从数据源读取数据的OracleDataReader对象</returns>   
        public static OracleDataReader ExecuteReader(string cmdText)
        {
            OracleDataReader reader;
            try
            {
                init();
                cmd = new OracleCommand(cmdText, conn);
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return reader;
        }
        #endregion
        #region 执行带参数的sql语句或存储过程，返回一个从数据源读取数据的OracleDataReader对象
        /// <param name="cmdText">sql语句或存储过程名</param>   
        /// <param name="cmdType">命令类型</param>   
        /// <param name="cmdParms">参数集合</param>   
        /// <returns>返回一个从数据源读取数据的OracleDataReader对象</returns>   
        public static OracleDataReader ExecuteReader(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            OracleDataReader reader;
            try
            {
                init();
                cmd = new OracleCommand();
                SetCommand(cmd, cmdText, cmdType, cmdParms);
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return reader;
        }
        #endregion
        #region 执行不带参数sql语句,返回结果集首行首列的值object
        /// <param name="cmdstr">相应的sql语句</param>   
        /// <returns>返回结果集首行首列的值object</returns>   
        public static object ExecuteScalar(string cmdText)
        {
            object obj;
            try
            {
                init();
                cmd = new OracleCommand(cmdText, conn);
                obj = cmd.ExecuteScalar();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return obj;
        }
        #endregion
        #region 执行带参数sql语句或存储过程,返回结果集首行首列的值object
        /// <param name="cmdText">sql语句或存储过程名</param>   
        /// <param name="cmdType">命令类型</param>   
        /// <param name="cmdParms">返回结果集首行首列的值object</param>   
        /// <returns></returns>   
        public static object ExecuteScalar(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            object obj;
            try
            {
                init();
                cmd = new OracleCommand();
                SetCommand(cmd, cmdText, cmdType, cmdParms);
                obj = cmd.ExecuteScalar();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return obj;
        }
        #endregion

        /// <summary>
        /// MD5解密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string FromMd5(string str)
        {
            return Decrypt(str, "&%#@?,:*_");
        }
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="strText"></param>
        /// <param name="sDecrKey"></param>
        /// <returns></returns>
        private static String Decrypt(String strText, String sDecrKey)
        {

            Byte[] byKey = { };
            Byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
            Byte[] inputByteArray = new byte[strText.Length];
            try
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                inputByteArray = Convert.FromBase64String(strText);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                System.Text.Encoding encoding = System.Text.Encoding.UTF8;
                return encoding.GetString(ms.ToArray());
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }
    }
}