using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Configuration;
using System.Collections.Generic;
using Oracle.ManagedDataAccess.Client;
using Oracle.ManagedDataAccess.Types;
using System.Text;
namespace FangYar.Common
{

    /// <summary>
    /// Copyright (C) Maticsoft
    /// 数据访问基础类(基于Oracle)
    /// 可以用户可以修改满足自己项目的需要。
    /// </summary>
    public abstract class SqlHelperOra
    {

        //public static string connectionString = @"Data Source =(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=orcl)));User Id=test;Password=test;Integrated Security=no;Unicode=True;";
        //public static string connectionString = "User Id=test;Password=test;Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=orcl)))";
        //public static string connectionString = System.Configuration.ConfigurationSettings.AppSettings["OraConn"].ToString();
        public static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["OraConn"].ConnectionString;

        public SqlHelperOra()
        {

        }

        #region 分页查询
        /// <summary>
        /// 分页无排序
        /// </summary>
        /// <param name="PageIndex">页面索引</param>
        /// <param name="PageSize">页面大小</param>
        /// <param name="TableName">表名</param>
        /// <param name="strwhere">查询条件</param>
        /// <returns></returns>
        public static DataTable QueryPage(int PageIndex, int PageSize, string TableName, string strwhere)
        {
            int endnum = PageIndex * PageSize;
            int startnum = (PageIndex - 1) * PageSize;
            StringBuilder strSql = new StringBuilder();
            strSql.Append("SELECT * FROM (");
            strSql.Append("SELECT t.*, ROWNUM RN  FROM " + TableName + " t where ");
            if (strwhere != "")
            {
                strSql.Append(strwhere + " and ");
            }
            strSql.Append("  ROWNUM <= " + endnum + ") tb");
            strSql.Append(" WHERE tb.RN >" + startnum);
            return QueryTable(strSql.ToString());
        }
        /// <summary>
        /// 分页有排序
        /// </summary>
        /// <param name="PageIndex">页面索引</param>
        /// <param name="PageSize">页面大小</param>
        /// <param name="TableName">表名</param>
        /// <param name="strwhere">查询条件</param>
        /// /// <param name="order">排序</param>
        /// <returns></returns>
        public static DataTable QueryPage(int PageIndex, int PageSize, string TableName, string strwhere, string order)
        {
            int endnum = PageIndex * PageSize;
            int startnum = (PageIndex - 1) * PageSize;
            StringBuilder strSql = new StringBuilder();
            strSql.Append("SELECT * FROM (SELECT tt.*, ROWNUM AS RN  FROM (  ");
            strSql.Append("SELECT t.* FROM " + TableName + " t  ");
            if (strwhere != null && strwhere != "")
            {
                strSql.Append(" where " + strwhere);
            }
            if (order != null && order != "")
            {
                strSql.Append(" ORDER BY " + order );
            }
            strSql.Append(") tt   WHERE ROWNUM <= " + endnum + ") tb ");
            strSql.Append(" WHERE tb.RN >" + startnum);
            return QueryTable(strSql.ToString());
        } 


        public static DataTable QueryJoinPage(int PageIndex, int PageSize,  string strwhere, string order)
        {
            int endnum = PageIndex * PageSize;
            int startnum = (PageIndex - 1) * PageSize;
            StringBuilder strSql = new StringBuilder();
            strSql.Append("SELECT * FROM (SELECT tt.*, ROWNUM AS RN  FROM (  ");
            strSql.Append(@"SELECT t.ID ,t.TITLE,t.CONTENT ,t.SENDER ,t.SENDERNAME,t.SENDTIME ,t.TASKID ,t.TYPE ,t.ATTACHFILE ,t.READTIME ,t.CATEGORY ,
                            t.ISPUBLIC ,t.DIGEST ,t.SOURCE ,t.UPDATETIME ,record.ID as RECORDID,record.RECEIVER ,record.RECEIVERNAME ,record.STATUS 
                                FROM  TBL_SYS_NOTICE t 
                                LEFT JOIN 
                                TBL_SYS_NOTICESENDRECORD record 
                                  ON t.ID = record.NOTICEID  ");
            if (strwhere != null && strwhere != "")
            {
                strSql.Append(" where " + strwhere);
            }
            if (order != null && order != "")
            {
                strSql.Append(" ORDER BY " + order );
            }
            strSql.Append(") tt   WHERE ROWNUM <= " + endnum + ") tb ");
            strSql.Append(" WHERE tb.RN >" + startnum);
            return QueryTable(strSql.ToString());
        }
        #endregion


        #region 公用方法

        /// <summary>
        /// 获取记录数
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static int GetCount(string sql)
        {
            
            object obj = GetSingle(sql);
            if (obj == null)
            {
                return 0;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }


        /// <summary>
        /// 获取记录数
        /// </summary>
        /// <param name="FieldName">查询条件</param>
        /// <param name="TableName">表名</param>
        /// <returns>记录数</returns>
        public static int GetCount(string strwhere, string TableName)
        {
            string strsql = string.Format("select count(*) from {0} {1}", TableName, strwhere);
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }

        
        /// <summary>
        /// 获取字段的最大值
        /// </summary>
        /// <param name="FieldName">字段名</param>
        /// <param name="TableName">表名</param>
        /// <returns>字段最大值</returns>
        public static int GetMaxID(string FieldName, string TableName)
        {
            string strsql = string.Format("select max({0})+1 from {1}", FieldName, TableName);
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }

        /// <summary>
        /// 获取字段的最大值
        /// </summary>
        /// <param name="FieldName">字段名</param>
        /// <param name="TableName">表名</param>
        /// <param name="strWhere">where条件</param>
        /// <returns>字段最大值</returns>
        public static long GetMaxID(string FieldName, string TableName, string strWhere)
        {
            string strsql = string.Format("select max({0})+1 from {1} where 1=1 {2}", FieldName, TableName, strWhere);
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return Convert.ToInt64(obj.ToString()) ;
            }
        }

        /// <summary>
        /// 根据指定Sql语句查询是否存在
        /// </summary>
        /// <param name="strSql">要执行的Sql语句</param>
        /// <returns>存在返回true，不存在返回false</returns>
        public static bool Exists(string strSql)
        {
            object obj = GetSingle(strSql);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }

            return cmdresult == 0 ? false : true;
        }

        /// <summary>
        /// 根据指定Sql语句及参数查询是否存在
        /// </summary>
        /// <param name="strSql">要执行的Sql语句（包含参数值的标识）</param>
        /// <param name="cmdParms">参数值数组</param>
        /// <returns>存在返回true，不存在返回false</returns>
        public static bool Exists(string strSql, params OracleParameter[] cmdParms)
        {
            object obj = GetSingle(strSql, cmdParms);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }


        #endregion

        #region  执行简单SQL语句

        /// <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 static int ExecuteSql(string SQLString)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                using (OracleCommand cmd = new OracleCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (OracleException E)
                    {
                        connection.Close();
                        throw new Exception(E.Message);
                    }
                }
            }
        }


        /// <summary>
        /// 执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">多条SQL语句</param>		
        public static bool ExecuteSqlTran(List<string> SQLStringList)
        {
            var _result = false;
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                conn.Open();
                OracleCommand cmd = new OracleCommand();
                cmd.Connection = conn;
                OracleTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    foreach (var strSql in SQLStringList)
                    {
                        if (strSql.Trim().Length > 1)
                        {
                            cmd.CommandText = strSql;
                            cmd.ExecuteNonQuery();
                        }
                    }
                    tx.Commit();
                    _result = true;
                }
                catch (OracleException E)
                {
                    tx.Rollback();
                }
            }
            return _result;
        }

        /// <summary>
        /// 执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">多条SQL语句</param>		
        public static void ExecuteSqlTran(ArrayList SQLStringList)
        {
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                conn.Open();
                OracleCommand cmd = new OracleCommand();
                cmd.Connection = conn;
                OracleTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    for (int n = 0; n < SQLStringList.Count; n++)
                    {
                        string strsql = SQLStringList[n].ToString();
                        if (strsql.Trim().Length > 1)
                        {
                            cmd.CommandText = strsql;
                            cmd.ExecuteNonQuery();
                        }
                    }
                    tx.Commit();
                }
                catch (OracleException E)
                {
                    tx.Rollback();
                    throw new Exception(E.Message);
                }
            }
        }
        /// <summary>
        /// 执行带一个存储过程参数的的SQL语句。
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string SQLString, string content)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand(SQLString, connection);
                OracleParameter myParameter = new OracleParameter("@content", OracleDbType.NVarchar2);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (OracleException E)
                {
                    throw new Exception(E.Message);
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        /// <summary>
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
        /// </summary>
        /// <param name="strSQL">SQL语句</param>
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand(strSQL, connection);
                OracleParameter myParameter = new OracleParameter("@fs", OracleDbType.LongRaw);
                myParameter.Value = fs;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (OracleException E)
                {
                    throw new Exception(E.Message);
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }

        /// <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 static object GetSingle(string SQLString)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                using (OracleCommand cmd = new OracleCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (OracleException e)
                    {
                        connection.Close();
                        throw new Exception(e.Message);
                    }
                }
            }
        }
        /// <summary>
        /// 执行查询语句，返回OracleDataReader ( 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>OracleDataReader</returns>
        public static OracleDataReader ExecuteReader(string strSQL)
        {
            OracleConnection connection = new OracleConnection(connectionString);
            OracleCommand cmd = new OracleCommand(strSQL, connection);
            try
            {
                connection.Open();
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return myReader;
            }
            catch (OracleException e)
            {
                throw new Exception(e.Message);
            }
            finally
            {

                connection = null;
                connection.Close();
            }

        }
        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataSet</returns>
        public static 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 (OracleException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }
        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string SQLString, DataSet ds, string TableName)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                try
                {
                    connection.Open();
                    OracleDataAdapter command = new OracleDataAdapter(SQLString, connection);
                    command.Fill(ds, TableName);
                }
                catch (OracleException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }
        /// <summary>
        /// 执行查询语句，返回DataTable
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataTable</returns>
        public static DataTable QueryTable(string SQLString)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                var dt = new DataTable();
                try
                {
                    connection.Open();
                    OracleDataAdapter command = new OracleDataAdapter(SQLString, connection);
                    command.Fill(dt);
                }
                catch (OracleException ex)
                {
                    throw new Exception(ex.Message);
                }
                return dt;
            }
        }

        #endregion

        #region 执行带参数的SQL语句

        /// <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 static int ExecuteSql(string SQLString, params OracleParameter[] cmdParms)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                using (OracleCommand cmd = new OracleCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (OracleException E)
                    {
                        throw new Exception(E.Message);
                    }
                }
            }
        }
        /// <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 static DataSet ExecuteProc(string produce, params OracleParameter[] cmdParms)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                using (OracleCommand cmd = new OracleCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null,CommandType.StoredProcedure, produce, cmdParms);
                        using (OracleDataAdapter da = new OracleDataAdapter(cmd))
                        {
                            DataSet ds = new DataSet();
                            try
                            {
                                da.Fill(ds);
                                cmd.Parameters.Clear();
                            }
                            catch (OracleException ex)
                            {
                                throw new Exception(ex.Message);
                            }
                            return ds;
                        }
                    }
                    catch (OracleException E)
                    {
                        throw new Exception(E.Message);
                    }
                }
            }
        }

        //执行(带参)存储过程返回DataTable
        public static DataTable ExecuteProcToDataTable(string strProcName, params OracleParameter[] parameters)
        {
            DataTable dt = new DataTable();
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                try
                {
                    OracleCommand cmd = new OracleCommand();
                    cmd.CommandText = strProcName;
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Connection = conn;
                    conn.Open();
                    if (parameters != null)
                    {
                        // 添加参数
                        cmd.Parameters.AddRange(parameters);
                    }

                    // 取数据
                    using (OracleDataAdapter adapter = new OracleDataAdapter(cmd))
                    {
                        adapter.Fill(dt);
                    }
                }
                catch (Exception ex)
                {
                    throw new Exception("错误:" + ex.Message + "/r/n跟踪:" + ex.StackTrace);
                }
                finally
                {
                    conn.Close();
                }
            }

            return dt;
        }


        /// <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 static OracleCommand ExecuteProcToCommand(string produce, params OracleParameter[] cmdParms)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                //connection.Open();
                using (OracleCommand cmd = new OracleCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, CommandType.StoredProcedure, produce, cmdParms);
                        cmd.ExecuteNonQuery();
                        return cmd;
                    }
                    catch (OracleException E)
                    {
                        throw new Exception(E.Message);
                    }
                }
            }
        }

        public static void ExecuteProcTest()
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                try
                {
                    string str_Sql = @"call proc_test(:p1,:p2)";
                    /*不能用：call proc_test(?,?)或者call proc_test(@p1,@p2)，这样会报ORA-01036:非法的变量名/编号错误 */
                    OracleCommand cmd = new OracleCommand(str_Sql, connection);
                    /*cmd.CommandType = CommandType.StoredProcedure;-注意这种方式调用存储过程，不能指定CommandType为StoredProcedure */

                    OracleParameter pram1 = new OracleParameter("p1", OracleDbType.Varchar2, 10);
                    pram1.Value = "test";

                    cmd.Parameters.Add(pram1);

                    OracleParameter pram2 = new OracleParameter("p2", OracleDbType.Varchar2, 10);
                    pram2.Direction = ParameterDirection.Output;

                    cmd.Parameters.Add(pram2);

                    
                        connection.Open();

                    cmd.ExecuteNonQuery();
                    string text = cmd.Parameters[1].Value.ToString();
                }
                catch (Exception ex)
                {
                    throw new Exception(ex.Message);
                }
                finally
                {
                    connection.Close();
                }
            }
        }

        public static void ExecuteProcTest2(string produce, params OracleParameter[] cmdParms)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                //connection.Open();
                using (OracleCommand cmd = new OracleCommand())
                {
                    try
                    {
                        cmd.CommandText = produce;
                        cmd.CommandType = CommandType.StoredProcedure;
                        cmd.Connection = connection;
                        connection.Open();
                        cmd.Parameters.Add(cmdParms[0]);
                        cmd.Parameters.Add(cmdParms[1]);

                        //PrepareCommand(cmd, connection, null, CommandType.StoredProcedure, produce, cmdParms);
                        cmd.ExecuteNonQuery();
                        string p1 = cmd.Parameters["p1"].Value.ToString();////执行完成后得到回传的结果
                        string p2 = cmd.Parameters["p2"].Value.ToString();////执行完成后得到回传的结果
                    }
                    catch (OracleException E)
                    {
                        throw new Exception(E.Message);
                    }
                }
            }
        }

        /// <summary>
        /// 执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OracleParameter[]）</param>
        public static void ExecuteSqlTran(Hashtable SQLStringList)
        {
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                conn.Open();
                using (OracleTransaction trans = conn.BeginTransaction())
                {
                    OracleCommand cmd = new OracleCommand();
                    try
                    {
                        //循环
                        foreach (DictionaryEntry myDE in SQLStringList)
                        {
                            string cmdText = myDE.Key.ToString();
                            OracleParameter[] cmdParms = (OracleParameter[])myDE.Value;
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();

                            trans.Commit();
                        }
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
        }


        /// <summary>
        /// 执行多条SQL语句，实现数据库事务。
        /// </summary>
        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OracleParameter[]）</param>
        public static bool ExecuteSqlTranBool(List<FangYar.Model.OA.CommonSql> SQLStringList)
        {
            var _result = false;
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                conn.Open();
                using (OracleTransaction trans = conn.BeginTransaction())
                {
                    OracleCommand cmd = new OracleCommand();
                    try
                    {
                        //循环
                        foreach (FangYar.Model.OA.CommonSql myDE in SQLStringList)
                        {
                            string cmdText = myDE.sql;
                            OracleParameter[] cmdParms = myDE.param;
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();

                        }
                        trans.Commit();
                        _result = true;
                    }
                    catch(Exception e)
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
            return _result;
        }

        /// <summary>  
        /// 使用oracle参数化批量插入、更新，实现数据库事务。--做文件上传，批量导入，批量更新  
        /// </summary>  
        /// <param name="SQLStringList">SQL语句的dictionary集合（key为OracleParameter[]语句，value是该语句的sql语句）</param>  
        public static int ExecuteSqlListParameterTran(Dictionary<OracleParameter[], string> list)
        {
            int val = 0;
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                conn.Open();
                using (OracleTransaction trans = conn.BeginTransaction())
                {
                    OracleCommand cmd = new OracleCommand();
                    cmd.Connection = conn;
                    try
                    {
                        //循环  
                        foreach (KeyValuePair<OracleParameter[], string> myDE in list)
                        {
                            if (myDE.Key == null)
                            {
                                cmd.CommandText = myDE.Value.ToString();
                                if (trans != null)
                                    cmd.Transaction = trans;
                                cmd.CommandType = CommandType.Text;
                                val += cmd.ExecuteNonQuery();
                            }
                            else
                            {
                                cmd.CommandText = myDE.Value.ToString();
                                if (trans != null)
                                    cmd.Transaction = trans;
                                cmd.CommandType = CommandType.Text;
                                OracleParameter[] cmdParms = (OracleParameter[])myDE.Key;
                                if (cmdParms != null)
                                {
                                    foreach (OracleParameter item in cmdParms)
                                    {
                                        cmd.Parameters.Add(item);
                                    }
                                }
                                val += cmd.ExecuteNonQuery();
                                cmd.Parameters.Clear();
                            }
                        }
                        trans.Commit();
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
            return val;
        }

        /// <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 static object GetSingle(string SQLString, params OracleParameter[] cmdParms)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                using (OracleCommand cmd = new OracleCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        object obj = cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (OracleException e)
                    {
                        throw new Exception(e.Message);
                    }
                }
            }
        }

        /// <summary>
        /// 执行查询语句，返回OracleDataReader ( 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>OracleDataReader</returns>
        public static OracleDataReader ExecuteReader(string SQLString, params OracleParameter[] cmdParms)
        {
            OracleConnection connection = new OracleConnection(connectionString);
            OracleCommand cmd = new OracleCommand();
            try
            {
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return myReader;
            }
            catch (OracleException e)
            {
                throw new Exception(e.Message);
            }

        }

        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string SQLString, params OracleParameter[] cmdParms)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand();
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                using (OracleDataAdapter da = new OracleDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    try
                    {
                        da.Fill(ds, "ds");
                        cmd.Parameters.Clear();
                    }
                    catch (OracleException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return ds;
                }
            }
        }

        /// <summary>
        /// 执行查询语句，返回DataTable
        /// </summary>
        /// <param name="SQLString">查询语句</param>
        /// <returns>DataTable</returns>
        public static DataTable QueryTable(string SQLString, params OracleParameter[] cmdParms)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand();
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                using (OracleDataAdapter da = new OracleDataAdapter(cmd))
                {
                    var dt = new DataTable();
                    try
                    {
                        da.Fill(dt);
                        cmd.Parameters.Clear();
                    }
                    catch (OracleException ex)
                    {
                        throw new Exception(ex.Message);

                    }
                    return dt;
                }
            }
        }

        /// <summary>
        /// 替换sql语句中的参数占位为真实的参数值
        /// </summary>
        /// <param name="cmd">OracleCommand对象</param>
        /// <param name="conn">数据库连接对象</param>
        /// <param name="trans">事务对象</param>
        /// <param name="cmdText">sql语句</param>
        /// <param name="cmdParms">参数值数组</param>
        private static 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;//cmdType;
            if (cmdParms != null)
            {
                foreach (OracleParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }
        /// <summary>
        /// 替换sql语句中的参数占位为真实的参数值
        /// </summary>
        /// <param name="cmd">OracleCommand对象</param>
        /// <param name="conn">数据库连接对象</param>
        /// <param name="trans">事务对象</param>
        /// <param name="cmdText">sql语句</param>
        /// <param name="cmdParms">参数值数组</param>
        private static void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, CommandType cmdtype, 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 = cmdtype;//cmdType;
            if (cmdParms != null)
            {
                foreach (OracleParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }
        #endregion

        #region 统计某表记录总数
        /// <summary>
        /// 统计某表记录总数
        /// </summary>
        /// <param name="KeyField">主键/索引键</param>
        /// <param name="TableName">数据库.用户名.表名</param>
        /// <param name="Condition">查询条件</param>
        /// <returns>返回记录总数</returns> 
        public static int GetRecordCount(string keyField, string tableName, string condition)
        {
            int RecordCount = 0;
            string sql = "select count(" + keyField + ") as count from " + tableName + " " + condition;
            DataSet ds = Query(sql);
            if (ds.Tables[0].Rows.Count > 0)
            {
                RecordCount = Convert.ToInt32(ds.Tables[0].Rows[0][0]);
            }
            ds.Clear();
            ds.Dispose();
            return RecordCount;
        }
        #endregion
        #region 统计某表记录总数
        /// <summary>
        /// 统计某表记录总数
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static int GetRecordCount(string sql)
        {
            int RecordCount = 0;
           
            DataSet ds = Query(sql);
            if (ds.Tables[0].Rows.Count > 0)
            {
                RecordCount = Convert.ToInt32(ds.Tables[0].Rows[0][0]);
            }
            ds.Clear();
            ds.Dispose();
            return RecordCount;
        }
        /// <summary>
        /// 统计某表记录总数
        /// </summary>
        /// <param name="Field">可重复的字段</param>
        /// <param name="tableName">数据库.用户名.表名</param>
        /// <param name="condition">查询条件</param>
        /// <param name="flag">字段是否主键</param>
        /// <returns>返回记录总数</returns> 
        public static int GetRecordCount(string Field, string tableName, string condition, bool flag)
        {
            int RecordCount = 0;
            if (flag)
            {
                RecordCount = GetRecordCount(Field, tableName, condition);
            }
            else
            {
                string sql = "select count(distinct(" + Field + ")) as count from " + tableName + " " + condition;
                DataSet ds = Query(sql);
                if (ds.Tables[0].Rows.Count > 0)
                {
                    RecordCount = Convert.ToInt32(ds.Tables[0].Rows[0][0]);
                }
                ds.Clear();
                ds.Dispose();
            }
            return RecordCount;
        }
        #endregion
        #region 统计某表分页总数
        /// <summary>
        /// 统计某表分页总数
        /// </summary>
        /// <param name="keyField">主键/索引键</param>
        /// <param name="tableName">表名</param>
        /// <param name="condition">查询条件</param>
        /// <param name="pageSize">页宽</param>
        /// <param name="RecordCount">记录总数</param>
        /// <returns>返回分页总数</returns> 
        public int GetPageCount(string keyField, string tableName, string condition, int pageSize, int RecordCount)
        {
            int PageCount = 0;
            PageCount = (RecordCount % pageSize) > 0 ? (RecordCount / pageSize) + 1 : RecordCount / pageSize;
            if (PageCount < 1) PageCount = 1;
            return PageCount;
        }
        /// <summary>
        /// 统计某表分页总数
        /// </summary>
        /// <param name="keyField">主键/索引键</param>
        /// <param name="tableName">表名</param>
        /// <param name="condition">查询条件</param>
        /// <param name="pageSize">页宽</param>
        /// <returns>返回页面总数</returns> 
        public int GetPageCount(string keyField, string tableName, string condition, int pageSize, ref int RecordCount)
        {
            RecordCount = GetRecordCount(keyField, tableName, condition);
            return GetPageCount(keyField, tableName, condition, pageSize, RecordCount);
        }
        /// <summary>
        /// 统计某表分页总数
        /// </summary>
        /// <param name="Field">可重复的字段</param>
        /// <param name="tableName">表名</param>
        /// <param name="condition">查询条件</param>
        /// <param name="pageSize">页宽</param>
        /// <param name="flag">是否主键</param>
        /// <returns>返回页页总数</returns> 
        public int GetPageCount(string Field, string tableName, string condition, ref int RecordCount, int pageSize, bool flag)
        {
            RecordCount = GetRecordCount(Field, tableName, condition, flag);
            return GetPageCount(Field, tableName, condition, pageSize, ref RecordCount);
        }
        #endregion
        #region Sql分页函数
        /// <summary>
        /// 构造分页查询SQL语句
        /// </summary>
        /// <param name="KeyField">主键</param>
        /// <param name="FieldStr">所有需要查询的字段(field1,field2...)</param>
        /// <param name="TableName">库名.拥有者.表名</param>
        /// <param name="where">查询条件1(where ...)</param>
        /// <param name="order">排序条件2(order by ...)</param>
        /// <param name="CurrentPage">当前页号</param>
        /// <param name="PageSize">页宽</param>
        /// <returns>SQL语句</returns> 
        public static string JoinPageSQL(string KeyField, string FieldStr, string TableName, string Where, string Order, int CurrentPage, int PageSize)
        {
            string sql = null;
            //if (CurrentPage == 1)
            //{
            //    sql = "select  " + CurrentPage * PageSize + " " + FieldStr + " from " + TableName + " " + Where + " " + Order + " ";
            //}
            //else
            //{
            //    sql = "select * from (";
            //    sql += "select  " + CurrentPage * PageSize + " " + FieldStr + " from " + TableName + " " + Where + " " + Order + ") a ";
            //    sql += "where " + KeyField + " not in (";
            //    sql += "select  " + (CurrentPage - 1) * PageSize + " " + KeyField + " from " + TableName + " " + Where + " " + Order + ")";
            //}
            sql = "SELECT * FROM (Select ROWNUM AS ROWNO, T.*  from " + TableName + " T " + Where + " AND ROWNUM <= " + (PageSize * CurrentPage) + ") TABLE_ALIAS WHERE TABLE_ALIAS.ROWNO >" + ((CurrentPage - 1) * PageSize);
            

            return sql;
        }
        /// <summary>
        /// 构造分页查询SQL语句
        /// </summary>
        /// <param name="Field">字段名(非主键)</param>
        /// <param name="TableName">库名.拥有者.表名</param>
        /// <param name="where">查询条件1(where ...)</param>
        /// <param name="order">排序条件2(order by ...)</param>
        /// <param name="CurrentPage">当前页号</param>
        /// <param name="PageSize">页宽</param>
        /// <returns>SQL语句</returns> 
        public static string JoinPageSQL(string Field, string TableName, string Where, string Order, int CurrentPage, int PageSize)
        {
            string sql = null;
            if (CurrentPage == 1)
            {
                sql = "select rownum " + CurrentPage * PageSize + " " + Field + " from " + TableName + " " + Where + " " + Order + " group by " + Field;
            }
            else
            {
                sql = "select * from (";
                sql += "select rownum " + CurrentPage * PageSize + " " + Field + " from " + TableName + " " + Where + " " + Order + " group by " + Field + " ) a ";
                sql += "where " + Field + " not in (";
                sql += "select rownum " + (CurrentPage - 1) * PageSize + " " + Field + " from " + TableName + " " + Where + " " + Order + " group by " + Field + ")";
            }
            return sql;
        }
        #endregion
    }
}