OracleHelper数据库事务处理

    原理：需要开启事务的Action贴上Transaction标签，则Action执行前开启事务，Action执行完提交事务，如果Action报错，则回滚事务。

    OracleHelper代码：

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Data.OracleClient;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Web;
using System.Xml.Linq;
using System.Data.Objects.DataClasses;
using Models;

namespace DBHelper
{
    /// <summary>
    /// Oracle操作类
    /// 2015年6月20日
    /// 写程序之前，首先引用System.Data.OracleClient
    /// </summary>
    public class OracleHelper
    {
        #region 静态变量
        /// <summary>
        /// 数据库连接字符串
        /// </summary>
        private static string connectionString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString();
        #endregion

        #region OracleConnection 获取数据库连接
        /// <summary>
        /// 获取数据库连接
        /// </summary>
        private static OracleConnection GetConn()
        {
            OracleConnection connection = null;

            string key = "Simpo2016_OracleConnection";

            if (HttpContext.Current.Items[key] == null)
            {
                connection = new OracleConnection(connectionString);
                connection.Open();
                HttpContext.Current.Items[key] = connection;
            }
            else
            {
                connection = (OracleConnection)HttpContext.Current.Items[key];
            }

            return connection;
        }
        #endregion

        #region OracleTransaction 获取事务对象
        /// <summary>
        /// 获取事务对象
        /// </summary>
        private static OracleTransaction GetTran()
        {
            OracleTransaction tran = null;

            string key = "Simpo2016_OracleTransaction";

            if (HttpContext.Current.Items[key] == null)
            {
                tran = GetConn().BeginTransaction();
                HttpContext.Current.Items[key] = tran;
            }
            else
            {
                tran = (OracleTransaction)HttpContext.Current.Items[key];
            }

            return tran;
        }
        #endregion

        #region 开起事务标志
        /// <summary>
        /// 事务标志
        /// </summary>
        private static string tranFlagKey = "Simpo2016_OracleTransaction_Flag";
        /// <summary>
        /// 添加事务标志
        /// </summary>
        public static void AddTranFlag()
        {
            HttpContext.Current.Items[tranFlagKey] = true;
        }
        /// <summary>
        /// 移除事务标志
        /// </summary>
        public static void RemoveTranFlag()
        {
            HttpContext.Current.Items[tranFlagKey] = false;
        }
        /// <summary>
        /// 事务标志
        /// </summary>
        public static bool TranFlag
        {
            get
            {
                bool tranFlag = false;

                if (HttpContext.Current.Items[tranFlagKey] != null)
                {
                    tranFlag = (bool)HttpContext.Current.Items[tranFlagKey];
                }

                return tranFlag;
            }
        }
        #endregion

        #region 用于查询的数据库连接
        /// <summary>
        /// 用于查询的数据库连接
        /// </summary>
        private OracleConnection m_Conn;
        #endregion

        #region 构造函数
        public OracleHelper()
        {
            m_Conn = new OracleConnection(connectionString);
        }
        #endregion

        #region 基础方法
        #region  执行简单SQL语句
        #region Exists
        public bool Exists(string sqlString)
        {
            using (OracleCommand cmd = new OracleCommand(sqlString, m_Conn))
            {
                try
                {
                    m_Conn.Open();
                    object obj = cmd.ExecuteScalar();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return false;
                    }
                    else
                    {
                        return true;
                    }
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    cmd.Dispose();
                    m_Conn.Close();
                }
            }
        }
        #endregion

        #region 执行SQL语句，返回影响的记录数
        /// <summary>
        /// 执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="sqlString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public int ExecuteSql(string sqlString)
        {
            OracleConnection connection = GetConn();
            using (OracleCommand cmd = new OracleCommand(sqlString, connection))
            {
                try
                {
                    if (connection.State != ConnectionState.Open) connection.Open();
                    if (TranFlag) cmd.Transaction = GetTran();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (Exception ex)
                {
                    throw new Exception(ex.Message);
                }
                finally
                {
                    cmd.Dispose();
                    if (!TranFlag) connection.Close();
                }
            }
        }
        #endregion

        #region 执行一条计算查询结果语句，返回查询结果
        /// <summary>
        /// 执行一条计算查询结果语句，返回查询结果（object）
        /// </summary>
        /// <param name="sqlString">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public object GetSingle(string sqlString)
        {
            using (OracleCommand cmd = new OracleCommand(sqlString, m_Conn))
            {
                try
                {
                    m_Conn.Open();
                    object obj = cmd.ExecuteScalar();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    cmd.Dispose();
                    m_Conn.Close();
                }
            }
        }
        #endregion

        #region 执行查询语句，返回SQLiteDataReader
        /// <summary>
        /// 执行查询语句，返回SQLiteDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
        /// </summary>
        /// <param name="sqlString">查询语句</param>
        /// <returns>SQLiteDataReader</returns>
        public OracleDataReader ExecuteReader(string sqlString)
        {
            OracleConnection connection = new OracleConnection(connectionString);
            OracleCommand cmd = new OracleCommand(sqlString, connection);
            try
            {
                connection.Open();
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return myReader;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region 执行查询语句，返回DataSet
        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="sqlString">查询语句</param>
        /// <returns>DataSet</returns>
        public DataSet Query(string sqlString)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    OracleDataAdapter command = new OracleDataAdapter(sqlString, connection);
                    command.Fill(ds, "ds");
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    connection.Close();
                }
                return ds;
            }
        }
        #endregion
        #endregion

        #region 执行带参数的SQL语句
        #region 执行SQL语句，返回影响的记录数
        /// <summary>
        /// 执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public int ExecuteSql(string SQLString, params  OracleParameter[] cmdParms)
        {
            OracleConnection connection = GetConn();
            using (OracleCommand cmd = new OracleCommand())
            {
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    if (TranFlag) cmd.Transaction = GetTran();
                    int rows = cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                    return rows;
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    cmd.Dispose();
                    if (!TranFlag) connection.Close();
                }
            }
        }
        #endregion

        #region 执行查询语句，返回SQLiteDataReader
        /// <summary>
        /// 执行查询语句，返回SQLiteDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
        /// </summary>
        /// <param name="strSQL">查询语句</param>
        /// <returns>SQLiteDataReader</returns>
        public OracleDataReader ExecuteReader(string sqlString, params OracleParameter[] cmdParms)
        {
            OracleCommand cmd = new OracleCommand();
            try
            {
                PrepareCommand(cmd, m_Conn, null, sqlString, cmdParms);
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return myReader;
            }
            catch (Exception ex)
            {
                throw ex;
            }

        }
        #endregion

        #region 执行查询语句，返回DataSet
        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="sqlString">查询语句</param>
        /// <returns>DataSet</returns>
        public DataSet Query(string sqlString, params OracleParameter[] cmdParms)
        {
            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, m_Conn, null, sqlString, cmdParms);
            using (OracleDataAdapter da = new OracleDataAdapter(cmd))
            {
                DataSet ds = new DataSet();
                try
                {
                    da.Fill(ds, "ds");
                    cmd.Parameters.Clear();
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    cmd.Dispose();
                    m_Conn.Close();
                }
                return ds;
            }
        }
        #endregion

        #region PrepareCommand
        private void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, string cmdText, OracleParameter[] cmdParms)
        {
            if (conn.State != ConnectionState.Open) conn.Open();
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            if (trans != null) cmd.Transaction = trans;
            cmd.CommandType = CommandType.Text;
            if (cmdParms != null)
            {
                foreach (OracleParameter parm in cmdParms)
                {
                    cmd.Parameters.Add(parm);
                }
            }
        }
        #endregion
        #endregion
        #endregion

        #region 增删改查
        #region 获取最大编号
        /// <summary>
        /// 获取最大编号
        /// </summary>
        /// <typeparam name="T">实体Model</typeparam>
        /// <param name="key">主键</param>
        public int GetMaxID<T>(string key)
        {
            Type type = typeof(T);

            string sql = string.Format("SELECT Max({0}) FROM {1}", key, type.Name);
            using (OracleCommand cmd = new OracleCommand(sql, m_Conn))
            {
                try
                {
                    m_Conn.Open();
                    object obj = cmd.ExecuteScalar();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return 1;
                    }
                    else
                    {
                        return int.Parse(obj.ToString()) + 1;
                    }
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    cmd.Dispose();
                    m_Conn.Close();
                }
            }
        }
        #endregion

        #region 添加
        /// <summary>
        /// 添加
        /// </summary>
        public void Insert(object obj)
        {
            StringBuilder strSql = new StringBuilder();
            Type type = obj.GetType();
            strSql.Append(string.Format("insert into {0}(", type.Name));

            PropertyInfo[] propertyInfoList = GetEntityProperties(type);
            List<string> propertyNameList = new List<string>();
            foreach (PropertyInfo propertyInfo in propertyInfoList)
            {
                propertyNameList.Add(propertyInfo.Name);
            }

            strSql.Append(string.Format("{0})", string.Join(",", propertyNameList.ToArray())));
            strSql.Append(string.Format(" values ({0})", string.Join(",", propertyNameList.ConvertAll<string>(a => ":" + a).ToArray())));
            OracleParameter[] parameters = new OracleParameter[propertyInfoList.Length];
            for (int i = 0; i < propertyInfoList.Length; i++)
            {
                PropertyInfo propertyInfo = propertyInfoList[i];
                object val = propertyInfo.GetValue(obj, null);
                OracleParameter oracleParameter = new OracleParameter(":" + propertyInfo.Name, val == null ? DBNull.Value : val);
                parameters[i] = oracleParameter;
            }

            ExecuteSql(strSql.ToString(), parameters);
        }
        #endregion

        #region 修改
        /// <summary>
        /// 修改
        /// </summary>
        public void Update(object obj)
        {
            object oldObj = Find(obj);
            if (oldObj == null) throw new Exception("无法获取到旧数据");

            StringBuilder strSql = new StringBuilder();
            Type type = obj.GetType();
            strSql.Append(string.Format("update {0} ", type.Name));

            PropertyInfo[] propertyInfoList = GetEntityProperties(type);
            List<string> propertyNameList = new List<string>();
            int savedCount = 0;
            foreach (PropertyInfo propertyInfo in propertyInfoList)
            {
                object oldVal = propertyInfo.GetValue(oldObj, null);
                object val = propertyInfo.GetValue(obj, null);
                if (!object.Equals(oldVal, val))
                {
                    propertyNameList.Add(propertyInfo.Name);
                    savedCount++;
                }
            }

            strSql.Append(string.Format(" set "));
            OracleParameter[] parameters = new OracleParameter[savedCount];
            StringBuilder sbPros = new StringBuilder();
            int k = 0;
            for (int i = 0; i < propertyInfoList.Length; i++)
            {
                PropertyInfo propertyInfo = propertyInfoList[i];
                object oldVal = propertyInfo.GetValue(oldObj, null);
                object val = propertyInfo.GetValue(obj, null);
                if (!object.Equals(oldVal, val))
                {
                    sbPros.Append(string.Format(" {0}=:{0},", propertyInfo.Name));
                    OracleParameter oracleParameter = new OracleParameter(":" + propertyInfo.Name, val == null ? DBNull.Value : val);
                    parameters[k++] = oracleParameter;
                }
            }
            if (sbPros.Length > 0)
            {
                strSql.Append(sbPros.ToString(0, sbPros.Length - 1));
            }
            strSql.Append(string.Format(" where {0}='{1}'", GetIdName(obj.GetType()), GetIdVal(obj).ToString()));

            if (savedCount > 0)
            {
                ExecuteSql(strSql.ToString(), parameters);
            }
        }
        #endregion

        #region 删除
        /// <summary>
        /// 根据Id删除
        /// </summary>
        public void Delete<T>(int id)
        {
            Type type = typeof(T);
            StringBuilder sbSql = new StringBuilder();
            sbSql.Append(string.Format("delete from {0} where {2}='{1}'", type.Name, id, GetIdName(type)));

            ExecuteSql(sbSql.ToString());
        }
        /// <summary>
        /// 根据Id集合删除
        /// </summary>
        public void BatchDelete<T>(string ids)
        {
            if (string.IsNullOrWhiteSpace(ids)) return;

            Type type = typeof(T);
            StringBuilder sbSql = new StringBuilder();
            sbSql.Append(string.Format("delete from {0} where {2} in ({1})", type.Name, ids, GetIdName(type)));

            ExecuteSql(sbSql.ToString());
        }
        /// <summary>
        /// 根据条件删除
        /// </summary>
        public void Delete<T>(string conditions)
        {
            if (string.IsNullOrWhiteSpace(conditions)) return;

            Type type = typeof(T);
            StringBuilder sbSql = new StringBuilder();
            sbSql.Append(string.Format("delete from {0} where {1}", type.Name, conditions));

            ExecuteSql(sbSql.ToString());
        }
        #endregion

        #region 获取实体
        #region 根据实体获取实体
        /// <summary>
        /// 根据实体获取实体
        /// </summary>
        private object Find(object obj)
        {
            Type type = obj.GetType();

            object result = Activator.CreateInstance(type);
            bool hasValue = false;
            IDataReader rd = null;

            string sql = string.Format("select * from {0} where {2}='{1}'", type.Name, GetIdVal(obj), GetIdName(obj.GetType()));

            try
            {
                rd = ExecuteReader(sql);

                PropertyInfo[] propertyInfoList = GetEntityProperties(type);

                int fcnt = rd.FieldCount;
                List<string> fileds = new List<string>();
                for (int i = 0; i < fcnt; i++)
                {
                    fileds.Add(rd.GetName(i).ToUpper());
                }

                while (rd.Read())
                {
                    hasValue = true;
                    IDataRecord record = rd;

                    foreach (PropertyInfo pro in propertyInfoList)
                    {
                        if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value)
                        {
                            continue;
                        }

                        pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null);
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (rd != null && !rd.IsClosed)
                {
                    rd.Close();
                    rd.Dispose();
                }
            }

            if (hasValue)
            {
                return result;
            }
            else
            {
                return null;
            }
        }
        #endregion

        #region 根据Id获取实体
        /// <summary>
        /// 根据Id获取实体
        /// </summary>
        private object FindById(Type type, int id)
        {
            object result = Activator.CreateInstance(type);
            IDataReader rd = null;
            bool hasValue = false;

            string sql = string.Format("select * from {0} where {2}='{1}'", type.Name, id, GetIdName(type));

            try
            {
                rd = ExecuteReader(sql);

                PropertyInfo[] propertyInfoList = GetEntityProperties(type);

                int fcnt = rd.FieldCount;
                List<string> fileds = new List<string>();
                for (int i = 0; i < fcnt; i++)
                {
                    fileds.Add(rd.GetName(i).ToUpper());
                }

                while (rd.Read())
                {
                    hasValue = true;
                    IDataRecord record = rd;

                    foreach (PropertyInfo pro in propertyInfoList)
                    {
                        if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value)
                        {
                            continue;
                        }

                        pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null);
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (rd != null && !rd.IsClosed)
                {
                    rd.Close();
                    rd.Dispose();
                }
            }

            if (hasValue)
            {
                return result;
            }
            else
            {
                return null;
            }
        }
        #endregion

        #region 根据Id获取实体
        /// <summary>
        /// 根据Id获取实体
        /// </summary>
        public T FindById<T>(string id) where T : new()
        {
            Type type = typeof(T);
            T result = (T)Activator.CreateInstance(type);
            IDataReader rd = null;
            bool hasValue = false;

            string sql = string.Format("select * from {0} where {2}='{1}'", type.Name, id, GetIdName(type));

            try
            {
                rd = ExecuteReader(sql);

                PropertyInfo[] propertyInfoList = GetEntityProperties(type);

                int fcnt = rd.FieldCount;
                List<string> fileds = new List<string>();
                for (int i = 0; i < fcnt; i++)
                {
                    fileds.Add(rd.GetName(i).ToUpper());
                }

                while (rd.Read())
                {
                    hasValue = true;
                    IDataRecord record = rd;

                    foreach (PropertyInfo pro in propertyInfoList)
                    {
                        if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value)
                        {
                            continue;
                        }

                        pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null);
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (rd != null && !rd.IsClosed)
                {
                    rd.Close();
                    rd.Dispose();
                }
            }

            if (hasValue)
            {
                return result;
            }
            else
            {
                return default(T);
            }
        }
        #endregion

        #region 根据sql获取实体
        /// <summary>
        /// 根据sql获取实体
        /// </summary>
        public T FindBySql<T>(string sql) where T : new()
        {
            Type type = typeof(T);
            T result = (T)Activator.CreateInstance(type);
            IDataReader rd = null;
            bool hasValue = false;

            try
            {
                rd = ExecuteReader(sql);

                PropertyInfo[] propertyInfoList = GetEntityProperties(type);

                int fcnt = rd.FieldCount;
                List<string> fileds = new List<string>();
                for (int i = 0; i < fcnt; i++)
                {
                    fileds.Add(rd.GetName(i).ToUpper());
                }

                while (rd.Read())
                {
                    hasValue = true;
                    IDataRecord record = rd;

                    foreach (PropertyInfo pro in propertyInfoList)
                    {
                        if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value)
                        {
                            continue;
                        }

                        pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null);
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (rd != null && !rd.IsClosed)
                {
                    rd.Close();
                    rd.Dispose();
                }
            }

            if (hasValue)
            {
                return result;
            }
            else
            {
                return default(T);
            }
        }
        #endregion
        #endregion

        #region 获取列表
        /// <summary>
        /// 获取列表
        /// </summary>
        public List<T> FindListBySql<T>(string sql) where T : new()
        {
            List<T> list = new List<T>();
            object obj;
            IDataReader rd = null;

            try
            {
                rd = ExecuteReader(sql);

                if (typeof(T) == typeof(int))
                {
                    while (rd.Read())
                    {
                        list.Add((T)rd[0]);
                    }
                }
                else if (typeof(T) == typeof(string))
                {
                    while (rd.Read())
                    {
                        list.Add((T)rd[0]);
                    }
                }
                else
                {
                    PropertyInfo[] propertyInfoList = (typeof(T)).GetProperties();

                    int fcnt = rd.FieldCount;
                    List<string> fileds = new List<string>();
                    for (int i = 0; i < fcnt; i++)
                    {
                        fileds.Add(rd.GetName(i).ToUpper());
                    }

                    while (rd.Read())
                    {
                        IDataRecord record = rd;
                        obj = new T();


                        foreach (PropertyInfo pro in propertyInfoList)
                        {
                            if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value)
                            {
                                continue;
                            }

                            pro.SetValue(obj, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null);
                        }
                        list.Add((T)obj);
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (rd != null && !rd.IsClosed)
                {
                    rd.Close();
                    rd.Dispose();
                }
            }

            return list;
        }
        #endregion

        #region 获取列表
        /// <summary>
        /// 获取列表
        /// </summary>
        public List<T> FindListBySql<T>(string sql, params OracleParameter[] cmdParms) where T : new()
        {
            List<T> list = new List<T>();
            object obj;
            IDataReader rd = null;

            try
            {
                rd = ExecuteReader(sql, cmdParms);

                if (typeof(T) == typeof(int))
                {
                    while (rd.Read())
                    {
                        list.Add((T)rd[0]);
                    }
                }
                else if (typeof(T) == typeof(string))
                {
                    while (rd.Read())
                    {
                        list.Add((T)rd[0]);
                    }
                }
                else
                {
                    PropertyInfo[] propertyInfoList = (typeof(T)).GetProperties();

                    int fcnt = rd.FieldCount;
                    List<string> fileds = new List<string>();
                    for (int i = 0; i < fcnt; i++)
                    {
                        fileds.Add(rd.GetName(i).ToUpper());
                    }

                    while (rd.Read())
                    {
                        IDataRecord record = rd;
                        obj = new T();


                        foreach (PropertyInfo pro in propertyInfoList)
                        {
                            if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value)
                            {
                                continue;
                            }

                            pro.SetValue(obj, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null);
                        }
                        list.Add((T)obj);
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (rd != null && !rd.IsClosed)
                {
                    rd.Close();
                    rd.Dispose();
                }
            }

            return list;
        }
        #endregion

        #region 分页获取列表
        /// <summary>
        /// 分页(任意entity，尽量少的字段)
        /// </summary>
        public PagerModel FindPageBySql<T>(string sql, string orderby, int pageSize, int currentPage) where T : new()
        {
            PagerModel pagerModel = new PagerModel();

            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                connection.Open();
                string commandText = string.Format("select count(*) from ({0}) T", sql);
                IDbCommand cmd = new OracleCommand(commandText, connection);
                pagerModel.totalRows = int.Parse(cmd.ExecuteScalar().ToString());

                int startRow = pageSize * (currentPage - 1);
                int endRow = startRow + pageSize;

                StringBuilder sb = new StringBuilder();
                sb.Append("select * from ( select row_limit.*, rownum rownum_ from (");
                sb.Append(sql);
                if (!string.IsNullOrWhiteSpace(orderby))
                {
                    sb.Append(" ");
                    sb.Append(orderby);
                }
                sb.Append(" ) row_limit where rownum <= ");
                sb.Append(endRow);
                sb.Append(" ) where rownum_ >");
                sb.Append(startRow);

                List<T> list = FindListBySql<T>(sb.ToString());
                pagerModel.result = list;
            }

            return pagerModel;
        }
        #endregion

        #region 分页获取列表
        /// <summary>
        /// 分页(任意entity，尽量少的字段)
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="sql"></param>
        /// <returns></returns>
        public PagerModel FindPageBySql<T>(string sql, string orderby, int pageSize, int currentPage, params OracleParameter[] cmdParms) where T : new()
        {
            PagerModel pagerModel = new PagerModel();

            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                connection.Open();
                string commandText = string.Format("select count(*) from ({0}) T", sql);
                OracleCommand cmd = new OracleCommand(commandText, connection);
                PrepareCommand(cmd, connection, null, commandText, cmdParms);
                pagerModel.totalRows = int.Parse(cmd.ExecuteScalar().ToString());
                cmd.Parameters.Clear();

                int startRow = pageSize * (currentPage - 1);
                int endRow = startRow + pageSize;

                StringBuilder sb = new StringBuilder();
                sb.Append("select * from ( select row_limit.*, rownum rownum_ from (");
                sb.Append(sql);
                if (!string.IsNullOrWhiteSpace(orderby))
                {
                    sb.Append(" ");
                    sb.Append(orderby);
                }
                sb.Append(" ) row_limit where rownum <= ");
                sb.Append(endRow);
                sb.Append(" ) where rownum_ >");
                sb.Append(startRow);

                List<T> list = FindListBySql<T>(sb.ToString(), cmdParms);
                pagerModel.result = list;
            }

            return pagerModel;
        }


        #endregion

        #region 分页获取列表
        /// <summary>
        /// 分页(任意entity，尽量少的字段)
        /// </summary>
        public DataSet FindPageBySql(string sql, string orderby, int pageSize, int currentPage, out int totalCount, params OracleParameter[] cmdParms)
        {
            DataSet ds = null;

            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                connection.Open();
                string commandText = string.Format("select count(*) from ({0}) T", sql);
                IDbCommand cmd = new OracleCommand(commandText, connection);
                totalCount = int.Parse(cmd.ExecuteScalar().ToString());

                int startRow = pageSize * (currentPage - 1);
                int endRow = startRow + pageSize;

                StringBuilder sb = new StringBuilder();
                sb.Append("select * from ( select row_limit.*, rownum rownum_ from (");
                sb.Append(sql);
                if (!string.IsNullOrWhiteSpace(orderby))
                {
                    sb.Append(" ");
                    sb.Append(orderby);
                }
                sb.Append(" ) row_limit where rownum <= ");
                sb.Append(endRow);
                sb.Append(" ) where rownum_ >");
                sb.Append(startRow);

                ds = Query(sql, cmdParms);
            }

            return ds;
        }
        #endregion

        #region getReaderValue 转换数据
        /// <summary>
        /// 转换数据
        /// </summary>
        private Object getReaderValue(Object rdValue, Type ptype)
        {
            if (ptype == typeof(double))
                return Convert.ToDouble(rdValue);

            if (ptype == typeof(decimal))
                return Convert.ToDecimal(rdValue);

            if (ptype == typeof(int))
                return Convert.ToInt32(rdValue);

            if (ptype == typeof(long))
                return Convert.ToInt64(rdValue);

            if (ptype == typeof(DateTime))
                return Convert.ToDateTime(rdValue);

            if (ptype == typeof(Nullable<double>))
                return Convert.ToDouble(rdValue);

            if (ptype == typeof(Nullable<decimal>))
                return Convert.ToDecimal(rdValue);

            if (ptype == typeof(Nullable<int>))
                return Convert.ToInt32(rdValue);

            if (ptype == typeof(Nullable<long>))
                return Convert.ToInt64(rdValue);

            if (ptype == typeof(Nullable<DateTime>))
                return Convert.ToDateTime(rdValue);

            return rdValue;
        }
        #endregion

        #region 获取主键名称
        /// <summary>
        /// 获取主键名称
        /// </summary>
        public string GetIdName(Type type)
        {
            PropertyInfo[] propertyInfoList = GetEntityProperties(type);
            foreach (PropertyInfo propertyInfo in propertyInfoList)
            {
                if (propertyInfo.GetCustomAttributes(typeof(IsIdAttribute), false).Length > 0)
                {
                    return propertyInfo.Name;
                }
            }
            return "Id";
        }
        #endregion

        #region 获取主键值
        /// <summary>
        /// 获取主键名称
        /// </summary>
        public object GetIdVal(object val)
        {
            string idName = GetIdName(val.GetType());
            if (!string.IsNullOrWhiteSpace(idName))
            {
                return val.GetType().GetProperty(idName).GetValue(val, null);
            }
            return 0;
        }
        #endregion

        #region 获取实体类属性
        /// <summary>
        /// 获取实体类属性
        /// </summary>
        private PropertyInfo[] GetEntityProperties(Type type)
        {
            List<PropertyInfo> result = new List<PropertyInfo>();
            PropertyInfo[] propertyInfoList = type.GetProperties();
            foreach (PropertyInfo propertyInfo in propertyInfoList)
            {
                if (propertyInfo.GetCustomAttributes(typeof(EdmRelationshipNavigationPropertyAttribute), false).Length == 0
                    && propertyInfo.GetCustomAttributes(typeof(BrowsableAttribute), false).Length == 0)
                {
                    result.Add(propertyInfo);
                }
            }
            return result.ToArray();
        }
        #endregion
        #endregion

        #region 事务
        #region 开始事务
        /// <summary>
        /// 开始事务
        /// </summary>
        public static void BeginTransaction()
        {
            GetTran();
            AddTranFlag();
        }
        #endregion

        #region 提交事务
        /// <summary>
        /// 提交事务
        /// </summary>
        public static void CommitTransaction()
        {
            try
            {
                if (GetConn().State == ConnectionState.Open)
                {
                    GetTran().Commit();
                    RemoveTranFlag();
                }
            }
            catch (Exception ex)
            {
                GetTran().Rollback();
                RemoveTranFlag();
            }
            finally
            {
                if (GetConn().State == ConnectionState.Open) GetConn().Close();
            }
        }
        #endregion

        #region 回滚事务(出错时调用该方法回滚)
        /// <summary>
        /// 回滚事务(出错时调用该方法回滚)
        /// </summary>
        public static void RollbackTransaction()
        {
            GetTran().Rollback();
            RemoveTranFlag();
            GetConn().Close();
        }
        #endregion
        #endregion

    }
}

    在MVC4项目的FilterConfig.cs文件中，添加ActionFilter拦截器：

using System.Web;
using System.Web.Mvc;
using Common;

namespace TechReport.Web
{
    public class FilterConfig
    {
        public static void RegisterGlobalFilters(GlobalFilterCollection filters)
        {
            filters.Add(new HandleErrorAttribute());
            filters.Add(new ActionFilter());
        }
    }
}

    ActionFilter拦截器代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Web.Mvc;
using DBHelper;

namespace Common
{
    /// <summary>
    /// Action拦截器
    /// </summary>
    public class ActionFilter : FilterAttribute, IActionFilter
    {
        //在执行操作方法之前调用
        public void OnActionExecuting(ActionExecutingContext filterContext)
        {
            MethodInfo method = filterContext.Controller.GetType().GetMethod(filterContext.ActionDescriptor.ActionName);
            object[] transactionAttributes = method.GetCustomAttributes(typeof(TransactionAttribute), false);
            if (transactionAttributes.Length > 0)
            {
                OracleHelper.BeginTransaction();
            }
        }

        //在执行操作方法后调用
        public void OnActionExecuted(ActionExecutedContext filterContext)
        {
            MethodInfo method = filterContext.Controller.GetType().GetMethod(filterContext.ActionDescriptor.ActionName);
            object[] transactionAttributes = method.GetCustomAttributes(typeof(TransactionAttribute), false);
            if (transactionAttributes.Length > 0)
            {
                if (filterContext.Exception == null)
                {
                    OracleHelper.CommitTransaction();
                }
                else
                {
                    OracleHelper.RollbackTransaction();
                    filterContext.ExceptionHandled = true;
                    ContentResult contentResult = new ContentResult();
                    contentResult.Content = filterContext.Exception.Message;
                    filterContext.Result = contentResult;
                }
            }
        }
    }
}

    TransactionAttribute类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Common
{
    /// <summary>
    /// 开启事务，添加此特性的方法不要使用try catch，若要使用，catch中应将错误再次抛出
    /// </summary>
    [Serializable, AttributeUsage(AttributeTargets.Method)]
    public class TransactionAttribute : Attribute
    {
    }
}

    在Action上添加[Transaction]标签：

[Transaction]
public ActionResult Submit(string reportCode)
{
    string strParams = Request["params"];
    REPORTAUDIT reportAudit = new REPORTAUDIT();
    REPORTFLOW reportFlow = new REPORTFLOW();

    SYS_USER empdetail = m_UserDal.Get(strParams.Get("AUDITUSERNAME"));
    reportAudit.AUDITUSERNAME = strParams.Get("AUDITUSERNAME");
    reportAudit.AUDITEMPNAME = empdetail.EMPNAME;
    reportAudit.AUDITTYPE = (int)Enums.AuditType.审核;
    reportAudit.ISFINISHED = 0;
    reportAudit.REPORTCODE = reportCode;
    reportAudit.TASKTIME = DateTime.Now;

    long auditSID = m_ReportAudit_DAL.GetAuditSID(reportCode, 2);
    if (m_ReportAudit_DAL.Exists(auditSID))
    {
        if (m_ReportAudit_DAL.Get(auditSID).ISFINISHED == 0)
        {
            return Content("正在提交，请稍后！");
        }
        else
        {
            reportAudit.AUDITSID = auditSID;
            m_ReportAudit_DAL.Update(reportAudit);
        }
    }
    else
    {
        reportAudit.AUDITSID = m_ReportAudit_DAL.GetMaxID();
        m_ReportAudit_DAL.Insert(reportAudit);
    }

    reportFlow.FLOWSERIALID = m_ReportFlow_DAL.GetMaxID();
    reportFlow.OPERATOREMPNAME = AdminUtil.LoginUser.EMPNAME;
    reportFlow.OPRATORUSERNAME = AdminUtil.LoginUser.USERNAME;
    reportFlow.OPERATORTIME = DateTime.Now;
    reportFlow.OPERATORTYPE = 4;
    reportFlow.OPINION = strParams.Get("OPINION");

    REPORT report = m_Report_DAL.GetByReportCode(reportCode);
    report.CALLBACKSTATE = 0; 
    report.REPORTSTATEID = (long)Enums.ReportState.待审核;  
    report.SYSTAR = int.Parse(strParams.Get("SYSTAR")); 
    report.SECLEVELID = int.Parse(strParams.Get("SECLEVELID")); 
    report.COVERID = long.Parse(strParams.Get("COVERID")); 
    m_Report_DAL.Update(report);

    int flag = Convert.ToInt32(report.COVERID);
    REPORTFILE reportFile = m_ReportFile_DAL.Get(reportCode);
    if (reportFile != null)
    {
        string filename = Server.MapPath(m_ReportFile_DAL.Get(reportCode).FILEADDR.ToString());
        if ((flag != 6) && (flag != 7))
        {
            AddPageInfo(filename, flag, reportCode);
        }
    }

    m_ReportFlow_DAL.Insert(reportFlow); 

    return Content("OK");
}

    DAL示例：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DBHelper;
using Models;

namespace DAL
{
    /// <summary>
    /// 
    /// </summary>
    public class ReportAudit_DAL
    {
        #region 变量
        private OracleHelper dbHelper = new OracleHelper();
        #endregion

        #region 添加
        public void Insert(REPORTAUDIT model)
        {
            dbHelper.Insert(model);
        }
        #endregion

       
    }
}