using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Configuration;
using System.Data;
using System.Data.OracleClient;
using System.Collections;
using CRM.Core.Model;

namespace CRM.Core.DAL
{
    public abstract class OracleHelper
    {
        //Read the connection strings from the configuration file
        //public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["AYCRMCONN"].ConnectionString;
        public static readonly string ZxdCRMConn = ConStringHelper.ZxdCRMConn;
        //public static readonly string QhCrmConn = ConStringHelper.QhCrmConn;



        //Create a hashtable for the parameter cached
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());

        /// <summary>
        /// Execute a database query which does not include a select
        /// </summary>
        /// <param name="connString">Connection string to database</param>
        /// <param name="cmdType">Command type either stored procedure or SQL</param>
        /// <param name="cmdText">Acutall SQL Command</param>
        /// <param name="commandParameters">Parameters to bind to the command</param>
        /// <returns></returns>
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {
            // Create a new Oracle command
            OracleCommand cmd = new OracleCommand();

            //Create a connection
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                try
                {
                    //Prepare the command
                    PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);

                    //Execute the command
                    int val = cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                    return val;
                }
                finally
                {
                    if (connection.State == ConnectionState.Open)
                        connection.Close();
                }
            }
        }
        /// <summary>
        /// dataTable批量导入数据
        /// </summary>
        /// <param name="connectionString">连接字符串</param>
        /// <param name="tableName">表名</param>
        /// <param name="dataTable">dataTable数据源</param>
        public static void OracleBulkInsert(string connectionString, string tableName, DataTable dataTable)
        {
            if (dataTable.Rows.Count == 0)
            {
                return;
            }
            using (Oracle.DataAccess.Client.OracleBulkCopy oracleBulkCopy = new Oracle.DataAccess.Client.OracleBulkCopy(connectionString, Oracle.DataAccess.Client.OracleBulkCopyOptions.UseInternalTransaction))
            {
                try
                {
                    oracleBulkCopy.DestinationTableName = tableName;
                    for (int i = 0; i < dataTable.Columns.Count; i++)
                    {
                        oracleBulkCopy.ColumnMappings.Add(dataTable.Columns[i].ColumnName,
                                                       dataTable.Columns[i].ColumnName);
                    }
                    oracleBulkCopy.WriteToServer(dataTable);
                }
                finally
                {
                    if (oracleBulkCopy.Connection.State == ConnectionState.Open)
                        oracleBulkCopy.Connection.Close();
                }
            }
        }
        /// <summary>
        /// dataTable批量导入数据
        /// </summary>
        /// <param name="oracleBulkCopy">传入操作对象</param>
        /// <param name="tableName">数据库表名</param>
        /// <param name="dataTable">要导入的dataTable</param>
        public static void OracleBulkInsert(Oracle.DataAccess.Client.OracleBulkCopy oracleBulkCopy, string tableName, DataTable dataTable)
        {
            if (dataTable.Rows.Count == 0)
            {
                return;
            }

            try
            {
                oracleBulkCopy.DestinationTableName = tableName;
                for (int i = 0; i < dataTable.Columns.Count; i++)
                {
                    oracleBulkCopy.ColumnMappings.Add(dataTable.Columns[i].ColumnName,
                                                   dataTable.Columns[i].ColumnName);
                }
                oracleBulkCopy.WriteToServer(dataTable);
            }
            finally
            {
                if (oracleBulkCopy.Connection.State == ConnectionState.Open)
                    oracleBulkCopy.Connection.Close();
            }
        }
        /// <summary>
        /// dataTable批量导入数据(连接字符串默认为AYCRMConn)
        /// </summary>
        /// <param name="tableName">表名</param>
        /// <param name="dataTable">dataTable数据源</param>
        public static void OracleBulkInsert(string tableName, DataTable dataTable)
        {
            OracleBulkInsert(ZxdCRMConn, tableName, dataTable);
        }
        /// <summary>
        /// 默认的连接串为AYCRMConn
        /// </summary>
        /// <param name="cmdType"></param>
        /// <param name="cmdText"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public static int ExecuteNonQuery(CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {
            return ExecuteNonQuery(ZxdCRMConn, cmdType, cmdText, commandParameters);
        }


        /// <summary>
        /// Execute an OracleCommand (that returns no resultset) against an existing database transaction 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
        /// </remarks>
        /// <param name="trans">an existing database transaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(OracleTransaction trans, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {
            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>
        /// Execute an OracleCommand (that returns no resultset) against an existing database connection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
        /// </remarks>
        /// <param name="conn">an existing database connection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(OracleConnection connection, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {

            try
            {
                OracleCommand cmd = new OracleCommand();

                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
                int val = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                return val;
            }
            finally
            {
                if(connection.State == ConnectionState.Open)
                    connection.Close();
            }
        }

        /// <summary>
        /// 返回一个dataset
        /// </summary>
        /// <param name="connectionstring"></param>
        /// <param name="cmdType"></param>
        /// <param name="cmdText"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public static DataSet DataQueray(string connectionstring, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {
            OracleConnection con = new OracleConnection(connectionstring);
            OracleCommand cmd = new OracleCommand(cmdText, con);
            try
            {
                cmd.CommandType = cmdType;
                cmd.Parameters.AddRange(commandParameters);
                OracleDataAdapter da = new OracleDataAdapter(cmd);
                DataSet ds = new DataSet();
                da.Fill(ds);
                cmd.Parameters.Clear();
                return ds;
            }
            finally
            {
                if (con.State == ConnectionState.Open)
                    con.Close();
            }
        }
        public static DataSet GetPageList(string connectionstring, CommandType cmdType, string cmdText, string orderField, string orderType, int pageIndex, int pageSize, ref int count, params OracleParameter[] commandParameters)
        {
            StringBuilder builder = new StringBuilder();
            OracleConnection con = new OracleConnection(connectionstring);
            try
            {
                string sqlcount = "Select Count(1) From (" + cmdText + ")  t";
                count = Convert.ToInt32( ExecuteScalar(connectionstring, CommandType.Text, sqlcount, commandParameters));
                int num = (pageIndex - 1) * pageSize;
                int num2 = pageSize;
                int num3 = num + num2 + 1;
                builder.Append("select * from(select t.*,rownum rn from(" + cmdText + " order by " + orderField + " " + orderType + ") t where rownum<" + num3 + ") where rn>" + num + "");

                OracleCommand cmd = new OracleCommand(builder.ToString(), con);
                cmd.CommandType = cmdType;
                cmd.Parameters.AddRange(commandParameters);
                OracleDataAdapter da = new OracleDataAdapter(cmd);
                DataSet ds = new DataSet();
                da.Fill(ds);
                cmd.Parameters.Clear();
                return ds;
            }
            catch
            {
                throw;
            }
            finally
            {
                if (con.State == ConnectionState.Open)
                    con.Close();
            }
        }
        public static DataSet DataQueray(OracleTransaction transaction, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException("The transaction was rollbacked	or commited, please	provide	an open	transaction.", "transaction");

            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, transaction.Connection, transaction, cmdType, cmdText, commandParameters);
            using (OracleDataAdapter da = new OracleDataAdapter(cmd))
            {
                DataSet ds = new DataSet();
                da.Fill(ds);
                cmd.Parameters.Clear();
                return ds;
            }



            //OracleConnection con = new OracleConnection(connectionstring);
            //OracleCommand cmd = new OracleCommand(cmdText, con);
            //try
            //{
            //    cmd.CommandType = cmdType;
            //    cmd.Parameters.AddRange(commandParameters);
            //    OracleDataAdapter da = new OracleDataAdapter(cmd);
            //    DataSet ds = new DataSet();
            //    da.Fill(ds);
            //    cmd.Parameters.Clear();
            //    return ds;
            //}
            //catch
            //{
            //    con.Close();
            //    throw;
            //}
        }
        /// <summary>
        /// 默认的连接串为AYCRMConn
        /// </summary>
        /// <param name="cmdType"></param>
        /// <param name="cmdText"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public static DataSet DataQueray(CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {
            return DataQueray(ZxdCRMConn, cmdType, cmdText, commandParameters);
        }


        /// <summary>
        /// Execute a select query that will return a result set
        /// </summary>
        /// <param name="connString">Connection string</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
        /// <returns></returns>
        public static OracleDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {

            //Create the command and connection
            OracleCommand cmd = new OracleCommand();
            OracleConnection conn = new OracleConnection(connectionString);

            try
            {
                //Prepare the command to execute
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);

                //Execute the query, stating that the connection should close when the resulting datareader has been read
                OracleDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;

            }
            finally
            {
                conn.Close();
            }
        }
        /// <summary>
        /// 默认的连接串为AYCRMConn
        /// </summary>
        /// <param name="cmdType"></param>
        /// <param name="cmdText"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public static OracleDataReader ExecuteReader(CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {
            return ExecuteReader(ZxdCRMConn, cmdType, cmdText, commandParameters);
        }


        /// <summary>
        /// Execute an OracleCommand that returns the first column of the first record against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for a SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
        public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {
            OracleCommand cmd = new OracleCommand();

            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                try
                {
                    PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                    object val = cmd.ExecuteScalar();
                    cmd.Parameters.Clear();
                    return val;
                }
                finally
                {
                    conn.Close();
                }
            }
        }
        /// <summary>
        /// 默认的连接串为AYCRMConn
        /// </summary>
        /// <param name="cmdType"></param>
        /// <param name="cmdText"></param>
        /// <param name="commandParameters"></param>
        /// <returns></returns>
        public static object ExecuteScalar(CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {
            return ExecuteScalar(ZxdCRMConn, cmdType, cmdText, commandParameters);
        }


        ///	<summary>
        ///	Execute	a OracleCommand (that returns a 1x1 resultset)	against	the	specified SqlTransaction
        ///	using the provided parameters.
        ///	</summary>
        ///	<param name="transaction">A	valid SqlTransaction</param>
        ///	<param name="commandType">The CommandType (stored procedure, text, etc.)</param>
        ///	<param name="commandText">The stored procedure name	or PL/SQL command</param>
        ///	<param name="commandParameters">An array of	OracleParamters used to execute the command</param>
        ///	<returns>An	object containing the value	in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(OracleTransaction transaction, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException("The transaction was rollbacked	or commited, please	provide	an open	transaction.", "transaction");

            // Create a	command	and	prepare	it for execution
            OracleCommand cmd = new OracleCommand();

            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

            // Execute the command & return	the	results
            object retval = cmd.ExecuteScalar();

            // Detach the SqlParameters	from the command object, so	they can be	used again
            cmd.Parameters.Clear();
            return retval;
        }

        /// <summary>
        /// Execute an OracleCommand that returns the first column of the first record against an existing database connection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  Object obj = ExecuteScalar(conn, CommandType.StoredProcedure, "PublishOrders", new OracleParameter(":prodid", 24));
        /// </remarks>
        /// <param name="conn">an existing database connection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <param name="commandParameters">an array of OracleParamters used to execute the command</param>
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
        public static object ExecuteScalar(OracleConnection connectionString, CommandType cmdType, string cmdText, params OracleParameter[] commandParameters)
        {
            try
            {
                OracleCommand cmd = new OracleCommand();

                PrepareCommand(cmd, connectionString, null, cmdType, cmdText, commandParameters);
                object val = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
                return val;
            }
            finally
            {
                connectionString.Close();
            }
        }

        /// <summary>
        /// Add a set of parameters to the cached
        /// </summary>
        /// <param name="cacheKey">Key value to look up the parameters</param>
        /// <param name="commandParameters">Actual parameters to cached</param>
        public static void CacheParameters(string cacheKey, params OracleParameter[] commandParameters)
        {
            parmCache[cacheKey] = commandParameters;
        }

        /// <summary>
        /// Fetch parameters from the cache
        /// </summary>
        /// <param name="cacheKey">Key to look up the parameters</param>
        /// <returns></returns>
        public static OracleParameter[] GetCachedParameters(string cacheKey)
        {
            OracleParameter[] cachedParms = (OracleParameter[])parmCache[cacheKey];

            if (cachedParms == null)
                return null;

            // If the parameters are in the cache
            OracleParameter[] clonedParms = new OracleParameter[cachedParms.Length];

            // return a copy of the parameters
            for (int i = 0, j = cachedParms.Length; i < j; i++)
                clonedParms[i] = (OracleParameter)((ICloneable)cachedParms[i]).Clone();

            return clonedParms;
        }

        /// <summary>
        /// Internal function to prepare a command for execution by the database
        /// </summary>
        /// <param name="cmd">Existing command object</param>
        /// <param name="conn">Database connection object</param>
        /// <param name="trans">Optional transaction object</param>
        /// <param name="cmdType">Command type, e.g. stored procedure</param>
        /// <param name="cmdText">Command test</param>
        /// <param name="commandParameters">Parameters for the command</param>
        private static void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, CommandType cmdType, string cmdText, OracleParameter[] commandParameters)
        {

            //Open the connection if required
            if (conn.State != ConnectionState.Open)
               conn.Open();

            //Set up the command
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            cmd.CommandType = cmdType;

            //Bind it to the transaction if it exists
            if (trans != null)
                cmd.Transaction = trans;

            // Bind the parameters passed in
            if (commandParameters != null)
            {
                foreach (OracleParameter parm in commandParameters)
                    cmd.Parameters.Add(parm);
            }
        }

        /// <summary>
        /// Converter to use boolean data type with Oracle
        /// </summary>
        /// <param name="value">Value to convert</param>
        /// <returns></returns>
        public static string OraBit(bool value)
        {
            if (value)
                return "Y";
            else
                return "N";
        }

        /// <summary>
        /// Converter to use boolean data type with Oracle
        /// </summary>
        /// <param name="value">Value to convert</param>
        /// <returns></returns>
        public static bool OraBool(string value)
        {
            if (value.Equals("Y"))
                return true;
            else
                return false;
        }

        #region 扩展方法
        /// <summary>
        /// 批量插入数据
        /// </summary>
        /// <param name="dt">要插入的数据</param>
        /// <param name="targetTable">数据库中的表</param>
        public static void BulkToDB(string connectionString, DataTable dt, string targetTable, int timeOut = 300)
        {
            if (dt.Rows.Count == 0)
            {
                return;
            }
            using (Oracle.DataAccess.Client.OracleBulkCopy oracleBulkCopy = new Oracle.DataAccess.Client.OracleBulkCopy(connectionString, Oracle.DataAccess.Client.OracleBulkCopyOptions.UseInternalTransaction))
            {
                try
                {
                    oracleBulkCopy.DestinationTableName = targetTable;
                    for (int i = 0; i < dt.Columns.Count; i++)
                    {
                        oracleBulkCopy.ColumnMappings.Add(dt.Columns[i].ColumnName,
                                                       dt.Columns[i].ColumnName);
                    }
                    oracleBulkCopy.WriteToServer(dt);
                }
                finally
                {
                    oracleBulkCopy.Connection.Close();
                }
            }
        }

        public static void BulkToDB(DataTable dt, string targetTable, int timeOut = 300)
        {
            BulkToDB(ZxdCRMConn, dt, targetTable, timeOut);
        }
        #endregion
    }
}