Oracle操作数据库oracleHelper

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1 Oracle OracleHelper 

//===============================================================================
// OracleHelper based on Microsoft Data Access Application Block (DAAB) for .NET
// http://msdn.microsoft.com/library/en-us/dnbda/html/daab-rm.asp
//
// OracleHelper.cs
//
// This file contains the implementations of the OracleHelper and OracleHelperParameterCache
// classes.
//
// The DAAB for MS .NET Provider for Oracle has been tested in the context of this Nile implementation,
// but has not undergone the generic functional testing that the SQL version has gone through.
// You can use it in other .NET applications using Oracle databases.  For complete docs explaining how to use
// and how it‘s built go to the originl appblock link.
// For this sample, the code resides in the Nile namespaces not the Microsoft.ApplicationBlocks namespace
//==============================================================================

using System.Globalization;
using Oracle.DataAccess.Client;
using System;
using System.Collections;
using System.Data;

namespace Oracle.Access
{
    /// <summary>
    /// The OracleHelper class is intended to encapsulate high performance, scalable best practices for
    /// common uses of OracleClient.
    /// </summary>
    public sealed class OracleHelper
    {
        #region private utility methods & constructors

        //Since this class provides only static methods, make the default constructor private to prevent
        //instances from being created with "new OracleHelper()".
        private OracleHelper()
        {
        }

        /// <summary>
        /// This method is used to attach array‘s of OracleParameters to an OracleCommand.
        ///
        /// This method will assign a value of DbNull to any parameter with a direction of
        /// InputOutput and a value of null.
        ///
        /// This behavior will prevent default values from being used, but
        /// this will be the less common case than an intended pure output parameter (derived as InputOutput)
        /// where the user provided no input value.
        /// </summary>
        /// <param name="command">The command to which the parameters will be added</param>
        /// <param name="commandParameters">an array of OracleParameters tho be added to command</param>
        private static void AttachParameters(OracleCommand command, OracleParameter[] commandParameters)
        {
            foreach (OracleParameter p in commandParameters)
            {
                //check for derived output value with no value assigned
                if ((p.Direction == ParameterDirection.InputOutput) && (p.Value == null))
                {
                    p.Value = DBNull.Value;
                }

                command.Parameters.Add(p);
            }
        }

        /// <summary>
        /// This method assigns an array of values to an array of OracleParameters.
        /// </summary>
        /// <param name="commandParameters">array of OracleParameters to be assigned values</param>
        /// <param name="parameterValues">array of objects holding the values to be assigned</param>
        private static void AssignParameterValues(OracleParameter[] commandParameters, object[] parameterValues)
        {
            if ((commandParameters == null) || (parameterValues == null))
            {
                //do nothing if we get no data
                return;
            }

            // we must have the same number of values as we pave parameters to put them in
            if (commandParameters.Length != parameterValues.Length)
            {
                throw new ArgumentException("Parameter count does not match Parameter Value count.");
            }

            //iterate through the OracleParameters, assigning the values from the corresponding position in the
            //value array
            for (int i = 0, j = commandParameters.Length; i < j; i++)
            {
                commandParameters[i].Value = parameterValues[i];
            }
        }

        /// <summary>
        /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters
        /// to the provided command.
        /// </summary>
        /// <param name="command">the OracleCommand to be prepared</param>
        /// <param name="connection">a valid OracleConnection, on which to execute this command</param>
        /// <param name="transaction">a valid OracleTransaction, or ‘null‘</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 OracleParameters to be associated with the command or ‘null‘ if no parameters are required</param>
        private static void PrepareCommand(OracleCommand command, OracleConnection connection, OracleTransaction transaction, CommandType commandType, string commandText, OracleParameter[] commandParameters)
        {
            //if the provided connection is not open, we will open it
            if (connection.State != ConnectionState.Open)
            {
                connection.Open();
            }

            //associate the connection with the command
            command.Connection = connection;

            //set the command text (stored procedure name or Oracle statement)
            command.CommandText = commandText;

            //if we were provided a transaction, assign it.
            if (transaction != null)
            {
                command.Transaction = transaction;
            }

            //set the command type
            command.CommandType = commandType;

            //attach the command parameters if they are provided
            if (commandParameters != null)
            {
                AttachParameters(command, commandParameters);
            }

            return;
        }

        /*
        /// <summary>初始化OracleCommand 对象</summary>
        /// <param name="conn">Connection 对象</param>
        /// <param name="cmdType">CommandType 值之一。</param>
        /// <param name="cmdText">已重写。 获取或设置要对数据源执行的 Transact-SQL 语句或存储过程。</param>
        /// <param name="commandParameters">参数</param>
        private static OracleCommand PrepareCommand(OracleConnection conn, CommandType cmdType, string cmdText, OracleParameter[] commandParameters)
        {
            //Open the connection if required
            if (conn.State != ConnectionState.Open)
                conn.Open();
            OracleCommand cmd = new OracleCommand(cmdText, conn);
            //Set up the command
            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 && commandParameters.Length > 0)
            {
                foreach (OracleParameter parm in commandParameters)
                    cmd.Parameters.Add(parm);
            }
            return cmd;
        }
        /// <summary>初始化SqlCommand 对象</summary>
        /// <param name="trans">Optional transaction object</param>
        /// <param name="cmdType">CommandType 值之一。</param>
        /// <param name="cmdText">已重写。 获取或设置要对数据源执行的 Transact-SQL 语句或存储过程。 </param>
        /// <param name="commandParameters">参数</param>
        private static OracleCommand PrepareCommand(OracleTransaction trans, CommandType cmdType, string cmdText, OracleParameter[] commandParameters)
        {
            if (trans == null)
                throw new ArgumentNullException("transaction");
            if (trans != null && trans.Connection == null)
                throw new ArgumentException("The transaction was rollbacked     or commited, please     provide an open transaction.", "transaction");
            //Open the connection if required
            if (trans.Connection.State != ConnectionState.Open)
                trans.Connection.Open();
            OracleCommand cmd = new OracleCommand(cmdText, trans.Connection);
            //Set up the command
            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);
            }
            return cmd;
        }
        */

        #endregion private utility methods & constructors

        #region ExecuteNonQuery

        /// <summary>
        /// Execute an OracleCommand (that returns no resultset and takes no parameters) against the database specified in
        /// the connection string.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of OracleParameters
            return ExecuteNonQuery(connectionString, commandType, commandText, (OracleParameter[])null);
        }

        /// <summary>
        /// Execute an OracleCommand (that returns no resultset) against the database specified in the connection string
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new OracleParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</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 OracleParameters used to execute the command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //create & open an OracleConnection, and dispose of it after we are done.
            using (OracleConnection cn = new OracleConnection(connectionString))
            {
                cn.Open();

                //call the overload that takes a connection in place of the connection string
                return ExecuteNonQuery(cn, commandType, commandText, commandParameters);
            }
        }

        /// <summary>
        /// Execute a stored procedure via an OracleCommand (that returns no resultset) against the database specified in
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure‘s return value parameter.
        ///
        /// e.g.:
        ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</param>
        /// <param name="spName">the name of the stored procedure</param>
        /// <param name="parameterValues">an array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
        {
            //if we got parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                //pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                OracleParameter[] commandParameters = OracleHelperParameterCache.GetSpParameterSet(connectionString, spName);

                //assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                //call the overload that takes an array of OracleParameters
                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>
        /// Execute an OracleCommand (that returns no resultset and takes no parameters) against the provided OracleConnection.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
        /// </remarks>
        /// <param name="connection">a valid OracleConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(OracleConnection connection, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of OracleParameters
            return ExecuteNonQuery(connection, commandType, commandText, (OracleParameter[])null);
        }

        /// <summary>
        /// Execute an OracleCommand (that returns no resultset) against the specified OracleConnection
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new OracleParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">a valid OracleConnection</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 OracleParameters 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 commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, connection, (OracleTransaction)null, commandType, commandText, commandParameters);

            //finally, execute the command.
            return cmd.ExecuteNonQuery();
        }

        /// <summary>
        /// Execute a stored procedure via an OracleCommand (that returns no resultset) against the specified OracleConnection
        /// using the provided parameter values.  This method will query the database to discover the parameters for the
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure‘s return value parameter.
        ///
        /// e.g.:
        ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
        /// </remarks>
        /// <param name="connection">a valid OracleConnection</param>
        /// <param name="spName">the name of the stored procedure</param>
        /// <param name="parameterValues">an array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(OracleConnection connection, string spName, params object[] parameterValues)
        {
            //if we got parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                //pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                OracleParameter[] commandParameters = OracleHelperParameterCache.GetSpParameterSet(connection.ConnectionString, spName);

                //assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                //call the overload that takes an array of OracleParameters
                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>
        /// Execute an OracleCommand (that returns no resultset and takes no parameters) against the provided OracleTransaction.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
        /// </remarks>
        /// <param name="transaction">a valid OracleTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(OracleTransaction transaction, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of OracleParameters
            return ExecuteNonQuery(transaction, commandType, commandText, (OracleParameter[])null);
        }

        /// <summary>
        /// Execute an OracleCommand (that returns no resultset) against the specified OracleTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new OracleParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">a valid OracleTransaction</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 OracleParameters used to execute the command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(OracleTransaction transaction, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

            //finally, execute the command.
            return cmd.ExecuteNonQuery();
        }

        /// <summary>
        /// Execute a stored procedure via an OracleCommand (that returns no resultset) against the specified
        /// OracleTransaction using the provided parameter values.  This method will query the database to discover the parameters for the
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure‘s return value parameter.
        ///
        /// e.g.:
        ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction">a valid OracleTransaction</param>
        /// <param name="spName">the name of the stored procedure</param>
        /// <param name="parameterValues">an array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(OracleTransaction transaction, string spName, params object[] parameterValues)
        {
            //if we got parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                //pull the parameters for this stored procedure from the parameter cache (or discover them & populet the cache)
                OracleParameter[] commandParameters = OracleHelperParameterCache.GetSpParameterSet(transaction.Connection.ConnectionString, spName);

                //assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                //call the overload that takes an array of OracleParameters
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteNonQuery

        #region ExecuteDataSet

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset and takes no parameters) against the database specified in
        /// the connection string.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of OracleParameters
            return ExecuteDataset(connectionString, commandType, commandText, (OracleParameter[])null);
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset) against the database specified in the connection string
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new OracleParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</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 OracleParameters used to execute the command</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //create & open an OracleConnection, and dispose of it after we are done.
            using (OracleConnection cn = new OracleConnection(connectionString))
            {
                cn.Open();

                //call the overload that takes a connection in place of the connection string
                return ExecuteDataset(cn, commandType, commandText, commandParameters);
            }
        }

        /// <summary>
        /// Execute a stored procedure via an OracleCommand (that returns a resultset) against the database specified in
        /// the conneciton string using the provided parameter values.  This method will query the database to discover the parameters for the
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure‘s return value parameter.
        ///
        /// e.g.:
        ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</param>
        /// <param name="spName">the name of the stored procedure</param>
        /// <param name="parameterValues">an array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
        {
            //if we got parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                //pull the parameters for this stored procedure from the parameter cache (or discover them & populet the cache)
                OracleParameter[] commandParameters = OracleHelperParameterCache.GetSpParameterSet(connectionString, spName);

                //assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                //call the overload that takes an array of OracleParameters
                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset and takes no parameters) against the provided OracleConnection.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection">a valid OracleConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(OracleConnection connection, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of OracleParameters
            return ExecuteDataset(connection, commandType, commandText, (OracleParameter[])null);
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset) against the specified OracleConnection
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new OracleParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">a valid OracleConnection</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 OracleParameters used to execute the command</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(OracleConnection connection, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, connection, (OracleTransaction)null, commandType, commandText, commandParameters);

            //create the DataAdapter & DataSet
            OracleDataAdapter da = new OracleDataAdapter(cmd);
            DataSet ds = new DataSet();
            ds.Locale = CultureInfo.InvariantCulture;
            //fill the DataSet using default values for DataTable names, etc.
            da.Fill(ds);

            //return the dataset
            return ds;
        }

        /// <summary>
        /// Execute a stored procedure via an OracleCommand (that returns a resultset) against the specified OracleConnection
        /// using the provided parameter values.  This method will query the database to discover the parameters for the
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure‘s return value parameter.
        ///
        /// e.g.:
        ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connection">a valid OracleConnection</param>
        /// <param name="spName">the name of the stored procedure</param>
        /// <param name="parameterValues">an array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(OracleConnection connection, string spName, params object[] parameterValues)
        {
            //if we got parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                //pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                OracleParameter[] commandParameters = OracleHelperParameterCache.GetSpParameterSet(connection.ConnectionString, spName);

                //assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                //call the overload that takes an array of OracleParameters
                return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset and takes no parameters) against the provided OracleTransaction.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction">a valid OracleTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(OracleTransaction transaction, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of OracleParameters
            return ExecuteDataset(transaction, commandType, commandText, (OracleParameter[])null);
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset) against the specified OracleTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new OracleParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">a valid OracleTransaction</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 OracleParameters used to execute the command</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(OracleTransaction transaction, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

            //create the DataAdapter & DataSet
            OracleDataAdapter da = new OracleDataAdapter(cmd);
            DataSet ds = new DataSet();
            ds.Locale = CultureInfo.InvariantCulture;
            //fill the DataSet using default values for DataTable names, etc.
            da.Fill(ds);

            //return the dataset
            return ds;
        }

        /// <summary>
        /// Execute a stored procedure via an OracleCommand (that returns a resultset) against the specified
        /// OracleTransaction using the provided parameter values.  This method will query the database to discover the parameters for the
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure‘s return value parameter.
        ///
        /// e.g.:
        ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction">a valid OracleTransaction</param>
        /// <param name="spName">the name of the stored procedure</param>
        /// <param name="parameterValues">an array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>a dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(OracleTransaction transaction, string spName, params object[] parameterValues)
        {
            //if we got parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                //pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                OracleParameter[] commandParameters = OracleHelperParameterCache.GetSpParameterSet(transaction.Connection.ConnectionString, spName);

                //assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                //call the overload that takes an array of OracleParameters
                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
            }
        }
        public static DataSet ExecuteDataset(string connectionString, int pageIndex, int pageSize, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //create & open an OracleConnection, and dispose of it after we are done.
            using (OracleConnection cn = new OracleConnection(connectionString))
            {
                cn.Open();

                //call the overload that takes a connection in place of the connection string
                return ExecuteDataset(cn, pageIndex, pageSize, commandType, commandText, commandParameters);
            }
        }
        public static DataSet ExecuteDataset(OracleConnection connection, int pageIndex, int pageSize, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, connection, (OracleTransaction)null, commandType, commandText, commandParameters);

            //create the DataAdapter & DataSet
            OracleDataAdapter da = new OracleDataAdapter(cmd);
            DataSet ds = new DataSet();
            ds.Locale = CultureInfo.InvariantCulture;
            //fill the DataSet using default values for DataTable names, etc.
            da.Fill(ds, (pageIndex - 1) * pageSize, pageSize, "pageTable");

            //return the dataset
            return ds;
        }

        #endregion ExecuteDataSet

        #region ExecuteReader

        /// <summary>
        /// this enum is used to indicate weather the connection was provided by the caller, or created by OracleHelper, so that
        /// we can set the appropriate CommandBehavior when calling ExecuteReader()
        /// </summary>
        private enum OracleConnectionOwnership
        {
            /// <summary>Connection is owned and managed by OracleHelper</summary>
            Internal,

            /// <summary>Connection is owned and managed by the caller</summary>
            External
        }

        /// <summary>
        /// Create and prepare an OracleCommand, and call ExecuteReader with the appropriate CommandBehavior.
        /// </summary>
        /// <remarks>
        /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
        ///
        /// If the caller provided the connection, we want to leave it to them to manage.
        /// </remarks>
        /// <param name="connection">a valid OracleConnection, on which to execute this command</param>
        /// <param name="transaction">a valid OracleTransaction, or ‘null‘</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 OracleParameters to be associated with the command or ‘null‘ if no parameters are required</param>
        /// <param name="connectionOwnership">indicates whether the connection parameter was provided by the caller, or created by OracleHelper</param>
        /// <returns>OracleDataReader containing the results of the command</returns>
        private static OracleDataReader ExecuteReader(OracleConnection connection, OracleTransaction transaction, CommandType commandType, string commandText, OracleParameter[] commandParameters, OracleConnectionOwnership connectionOwnership)
        {
            //create a command and prepare it for execution
            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters);

            //create a reader
            OracleDataReader dr;

            // call ExecuteReader with the appropriate CommandBehavior
            if (connectionOwnership == OracleConnectionOwnership.External)
            {
                dr = cmd.ExecuteReader();
            }
            else
            {
                dr = cmd.ExecuteReader((CommandBehavior)((int)CommandBehavior.CloseConnection));
            }

            return (OracleDataReader)dr;
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset and takes no parameters) against the database specified in
        /// the connection string.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  OracleDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <returns>an OracleDataReader containing the resultset generated by the command</returns>
        public static OracleDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of OracleParameters
            return ExecuteReader(connectionString, commandType, commandText, (OracleParameter[])null);
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset) against the database specified in the connection string
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  OracleDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new OracleParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</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 OracleParameters used to execute the command</param>
        /// <returns>an OracleDataReader containing the resultset generated by the command</returns>
        public static OracleDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //create & open an OraclebConnection
            OracleConnection cn = new OracleConnection(connectionString);
            cn.Open();

            try
            {
                //call the private overload that takes an internally owned connection in place of the connection string
                return ExecuteReader(cn, null, commandType, commandText, commandParameters, OracleConnectionOwnership.Internal);
            }
            catch
            {
                //if we fail to return the OracleDataReader, we need to close the connection ourselves
                cn.Close();
                throw;
            }
        }

        /// <summary>
        /// Execute a stored procedure via an OracleCommand (that returns a resultset) against the database specified in
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure‘s return value parameter.
        ///
        /// e.g.:
        ///  OracleDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</param>
        /// <param name="spName">the name of the stored procedure</param>
        /// <param name="parameterValues">an array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>an OracleDataReader containing the resultset generated by the command</returns>
        public static OracleDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
        {
            //if we got parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                //pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                OracleParameter[] commandParameters = OracleHelperParameterCache.GetSpParameterSet(connectionString, spName);

                //assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                //call the overload that takes an array of OracleParameters
                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset and takes no parameters) against the provided OracleConnection.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  OracleDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection">a valid OracleConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <returns>an OracleDataReader containing the resultset generated by the command</returns>
        public static OracleDataReader ExecuteReader(OracleConnection connection, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of OracleParameters
            return ExecuteReader(connection, commandType, commandText, (OracleParameter[])null);
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset) against the specified OracleConnection
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  OracleDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new OracleParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection">a valid OracleConnection</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 OracleParameters used to execute the command</param>
        /// <returns>an OracleDataReader containing the resultset generated by the command</returns>
        public static OracleDataReader ExecuteReader(OracleConnection connection, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //pass through the call to the private overload using a null transaction value and an externally owned connection
            return ExecuteReader(connection, (OracleTransaction)null, commandType, commandText, commandParameters, OracleConnectionOwnership.External);
        }

        /// <summary>
        /// Execute a stored procedure via an OracleCommand (that returns a resultset) against the specified OracleConnection
        /// using the provided parameter values.  This method will query the database to discover the parameters for the
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure‘s return value parameter.
        ///
        /// e.g.:
        ///  OracleDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connection">a valid OracleConnection</param>
        /// <param name="spName">the name of the stored procedure</param>
        /// <param name="parameterValues">an array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>an OracleDataReader containing the resultset generated by the command</returns>
        public static OracleDataReader ExecuteReader(OracleConnection connection, string spName, params object[] parameterValues)
        {
            //if we got parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                OracleParameter[] commandParameters = OracleHelperParameterCache.GetSpParameterSet(connection.ConnectionString, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteReader(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset and takes no parameters) against the provided OracleTransaction.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  OracleDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction">a valid OracleTransaction</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or PL/SQL command</param>
        /// <returns>an OracleDataReader containing the resultset generated by the command</returns>
        public static OracleDataReader ExecuteReader(OracleTransaction transaction, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of OracleParameters
            return ExecuteReader(transaction, commandType, commandText, (OracleParameter[])null);
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a resultset) against the specified OracleTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///   OracleDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new OracleParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction">a valid OracleTransaction</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 OracleParameters used to execute the command</param>
        /// <returns>an OracleDataReader containing the resultset generated by the command</returns>
        public static OracleDataReader ExecuteReader(OracleTransaction transaction, CommandType commandType, string commandText, params OracleParameter[] commandParameters)
        {
            //pass through to private overload, indicating that the connection is owned by the caller
            return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, OracleConnectionOwnership.External);
        }

        /// <summary>
        /// Execute a stored procedure via an OracleCommand (that returns a resultset) against the specified
        /// OracleTransaction using the provided parameter values.  This method will query the database to discover the parameters for the
        /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure‘s return value parameter.
        ///
        /// e.g.:
        ///  OracleDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction">a valid OracleTransaction</param>
        /// <param name="spName">the name of the stored procedure</param>
        /// <param name="parameterValues">an array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>an OracleDataReader containing the resultset generated by the command</returns>
        public static OracleDataReader ExecuteReader(OracleTransaction transaction, string spName, params object[] parameterValues)
        {
            //if we got parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                OracleParameter[] commandParameters = OracleHelperParameterCache.GetSpParameterSet(transaction.Connection.ConnectionString, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>分页返回执行结果</summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <param name="pageIndex">页数</param>
        /// <param name="pageSize">页大小</param>
        /// <param name="totalRecords">当此方法返回时,此参数包含在集合中返回的记录的总数。该参数未经初始化即被传递。</param>
        /// <param name="tblName">要显示的表或多个表的连接</param>
        /// <param name="fldName">要显示的字段列表</param>
        /// <param name="strCondition">查询条件,不包括WHERE</param>
        /// <param name="fldSort">排序字段列表或条件,不包括ORDER BY</param>
        /// <param name="commandParameters">传入的参数集</param>
        /// <returns></returns>
        public static OracleDataReader ExecuteReader(OracleConnection connection,
            int pageIndex, int pageSize, string tblName, string fldName, string strCondition, string fldSort,
            OracleParameter[] commandParameters)
        {
            string commandText = "";
            int PageLowerBound = (pageIndex /*- 1*/) * pageSize;
            int PageUpperBound = PageLowerBound + pageSize;
            string sTemp = "";
            if (!string.IsNullOrEmpty(strCondition))
            {
                sTemp += " WHERE " + strCondition;
            }
            if (!string.IsNullOrEmpty(fldSort))
            {
                sTemp += " ORDER BY " + fldSort;
            }
            if (pageIndex == 0)
                commandText = string.Format("SELECT * FROM (SELECT {0} FROM {1}{2}) WHERE ROWNUM<={3}", fldName, tblName, sTemp, PageUpperBound);
            else
                commandText = string.Format("SELECT * FROM (SELECT A.*,ROWNUM RNM FROM (SELECT {0} FROM {1}{2}) A WHERE ROWNUM <= {3}) WHERE RNM > {4}", fldName, tblName, sTemp, PageUpperBound, PageLowerBound);
            try
            {
                //Prepare the command to execute
                OracleCommand cmd = new OracleCommand();
                PrepareCommand(cmd, connection, (OracleTransaction)null, CommandType.Text, commandText, commandParameters);
                //OracleCommand cmd = PrepareCommand(conn, CommandType.Text, select, 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;
            }
            catch
            {
                //If an error occurs close the connection as the reader will not be used and we expect it to close the connection
                connection.Close();
                throw;
                //Log(e.Message + "\n" + select, commandParameters);
            }
        }

        public static OracleDataReader ExecuteReader(OracleConnection connection,
    int pageIndex, int pageSize, out int totalRecords, string tblName, string fldName, string strCondition, string fldSort,
    OracleParameter[] commandParameters)
        {
            string commandText = "";
            int PageLowerBound = (pageIndex /*- 1*/) * pageSize;
            int PageUpperBound = PageLowerBound + pageSize;
            totalRecords = 0;
            string sTemp = "";
            if (!string.IsNullOrEmpty(strCondition))
            {
                sTemp += " WHERE " + strCondition;
            }
            string stotalRecords = "SELECT COUNT(*) FROM {0}{1}";
            object obj = ExecuteScalar(connection, CommandType.Text, string.Format(stotalRecords, tblName, sTemp), commandParameters);
            if (obj != null && obj is decimal)
            {
                totalRecords = Convert.ToInt32(obj);
            }
            if (totalRecords < 1 || totalRecords < (PageLowerBound + 1))
            {
                return null;
            }
            if (!string.IsNullOrEmpty(fldSort))
            {
                sTemp += " ORDER BY " + fldSort;
            }
            if (pageIndex == 0)
                commandText = string.Format("SELECT * FROM (SELECT {0} FROM {1}{2}) WHERE ROWNUM<={3}", fldName, tblName, sTemp, PageUpperBound);
            else
                commandText = string.Format("SELECT * FROM (SELECT A.*,ROWNUM RNM FROM (SELECT {0} FROM {1}{2}) A WHERE ROWNUM <= {3}) WHERE RNM > {4}", fldName, tblName, sTemp, PageUpperBound, PageLowerBound);
            try
            {
                //Prepare the command to execute
                OracleCommand cmd = new OracleCommand();
                PrepareCommand(cmd, connection, (OracleTransaction)null, CommandType.Text, commandText, commandParameters);
                //OracleCommand cmd = PrepareCommand(conn, CommandType.Text, select, 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;
            }
            catch
            {
                //If an error occurs close the connection as the reader will not be used and we expect it to close the connection
                connection.Close();
                throw;
                //Log(e.Message + "\n" + select, commandParameters);
            }
        }

        #endregion ExecuteReader

        #region ExecuteScalar

        /// <summary>
        /// Execute an OracleCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in
        /// the connection string.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-Oracle command</param>
        /// <returns>an object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of OracleParameters
            return ExecuteScalar(connectionString, commandType, commandText, (OracleParameter[])null);
        }

        /// <summary>
        /// Execute an OracleCommand (that returns a 1x1 resultset) against the database specified in the connection string
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new OracleParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for an OracleConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-Oracle command</param>
        /// <param name="commandParameters">an array of OracleParameters used to execute the command</param>
        /// <returns>an object containing the value in the 1x1 res

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