OracleHelper

using System;
using DevExpress.Xpo;
using System.Data.OracleClient;
using System.Data;
using System.Collections;
using System.Configuration;

namespace BYCS_查找丟失單據
{
    /// <summary>
    /// 數據訪問基礎類(基於Oracle)
    /// 能夠用戶能夠修改知足本身項目的須要。
    /// </summary>
  public abstract class OracleHelper
    {
        //數據庫鏈接字符串(web.config來配置)，能夠動態更改connectionString支持多數據庫.    
        public static string connectionString = ConfigurationManager.ConnectionStrings["V7HQS"].ToString();
        public OracleHelper()
        {
        }

        #region 公用方法
        public static int GetMaxID(string FieldName, string TableName)
        {
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }
        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());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        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  執行簡單SQL語句
        /// <summary>
        /// 執行SQL語句，返回影響的記錄數
        /// </summary>
        /// <param name="SQLString">SQL語句</param>
        /// <returns>影響的記錄數</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 (System.Data.OracleClient.OracleException E)
                    {
                        connection.Close();
                        throw new Exception(E.Message);
                    }
                }
            }
        }

        /// <summary>
        /// 執行多條SQL語句，實現數據庫事務。
        /// </summary>
        /// <param name="SQLStringList">多條SQL語句</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 (System.Data.OracleClient.OracleException E)
                {
                    tx.Rollback();
                    throw new Exception(E.Message);
                }
            }
        }

        /// <summary>
        /// 執行帶一個存儲過程參數的的SQL語句。
        /// </summary>
        /// <param name="SQLString">SQL語句</param>
        /// <param name="content">參數內容,好比一個字段是格式複雜的文章，有特殊符號，能夠經過這個方式添加</param>
        /// <returns>影響的記錄數</returns>
    public static int ExecuteSql(string SQLString, string content)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand(SQLString, connection);
                System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@content", OracleType.NVarChar);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.OracleClient.OracleException E)
                {
                    throw new Exception(E.Message);
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }

        /// <summary>
        /// 向數據庫裏插入圖像格式的字段(和上面狀況相似的另外一種實例)
        /// </summary>
        /// <param name="strSQL">SQL語句</param>
        /// <param name="fs">圖像字節,數據庫的字段類型爲image的狀況</param>
        /// <returns>影響的記錄數</returns>
    public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                OracleCommand cmd = new OracleCommand(strSQL, connection);
                System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@fs", OracleType.LongRaw);
                myParameter.Value = fs;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.OracleClient.OracleException E)
                {
                    throw new Exception(E.Message);
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }

        /// <summary>
        /// 執行一條計算查詢結果語句，返回查詢結果（object）。
        /// </summary>
        /// <param name="SQLString">計算查詢結果語句</param>
        /// <returns>查詢結果（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 (System.Data.OracleClient.OracleException e)
                    {
                        connection.Close();
                        throw new Exception(e.Message);
                    }
                }
            }
        }

        /// <summary>
        /// 執行查詢語句，返回OracleDataReader ( 注意：調用該方法後，必定要對SqlDataReader進行Close )
        /// </summary>
        /// <param name="strSQL">查詢語句</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 (System.Data.OracleClient.OracleException e)
            {
                throw new Exception(e.Message);
            }

        }

        /// <summary>
        /// 執行查詢語句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查詢語句</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 (System.Data.OracleClient.OracleException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }
        #endregion

        #region 執行帶參數的SQL語句
        /// <summary>
        /// 執行SQL語句，返回影響的記錄數
        /// </summary>
        /// <param name="SQLString">SQL語句</param>
        /// <returns>影響的記錄數</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 (System.Data.OracleClient.OracleException E)
                    {
                        throw new Exception(E.Message);
                    }
                }
            }
        }

        /// <summary>
        /// 執行多條SQL語句，實現數據庫事務。
        /// </summary>
        /// <param name="SQLStringList">SQL語句的哈希表（key爲sql語句，value是該語句的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
                    {
                        //循環
                        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>
        /// 執行一條計算查詢結果語句，返回查詢結果（object）。
        /// </summary>
        /// <param name="SQLString">計算查詢結果語句</param>
        /// <returns>查詢結果（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 (System.Data.OracleClient.OracleException e)
                    {
                        throw new Exception(e.Message);
                    }
                }
            }
        }

        /// <summary>
        /// 執行查詢語句，返回OracleDataReader ( 注意：調用該方法後，必定要對SqlDataReader進行Close )
        /// </summary>
        /// <param name="strSQL">查詢語句</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 (System.Data.OracleClient.OracleException e)
            {
                throw new Exception(e.Message);
            }

        }

        /// <summary>
        /// 執行查詢語句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查詢語句</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 (System.Data.OracleClient.OracleException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return ds;
                }
            }
        }


        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);
            }
        }
        #endregion

        #region 存儲過程操做

        /// <summary>
        /// 執行存儲過程 返回SqlDataReader ( 注意：調用該方法後，必定要對SqlDataReader進行Close )
        /// </summary>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <returns>OracleDataReader</returns>
    public static OracleDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
        {
            OracleConnection connection = new OracleConnection(connectionString);
            OracleDataReader returnReader;
            connection.Open();
            OracleCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            command.CommandType = CommandType.StoredProcedure;
            returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
            return returnReader;
        }

        /// <summary>
        /// 執行存儲過程
        /// </summary>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <param name="tableName">DataSet結果中的表名</param>
        /// <returns>DataSet</returns>
    public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                DataSet dataSet = new DataSet();
                connection.Open();
                OracleDataAdapter sqlDA = new OracleDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                sqlDA.Fill(dataSet, tableName);
                connection.Close();
                return dataSet;
            }
        }

        /// <summary>
        /// 構建 OracleCommand 對象(用來返回一個結果集，而不是一個整數值)
        /// </summary>
        /// <param name="connection">數據庫鏈接</param>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <returns>OracleCommand</returns>
    private static OracleCommand BuildQueryCommand(OracleConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            OracleCommand command = new OracleCommand(storedProcName, connection);
            command.CommandType = CommandType.StoredProcedure;
            foreach (OracleParameter parameter in parameters)
            {
                command.Parameters.Add(parameter);
            }
            return command;
        }

        /// <summary>
        /// 執行存儲過程，返回影響的行數    
        /// </summary>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <param name="rowsAffected">影響的行數</param>
        /// <returns></returns>
    public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
        {
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                int result;
                connection.Open();
                OracleCommand command = BuildIntCommand(connection, storedProcName, parameters);
                rowsAffected = command.ExecuteNonQuery();
                result = (int)command.Parameters["ReturnValue"].Value;
                //Connection.Close();
                return result;
            }
        }

        /// <summary>
        /// 建立 OracleCommand 對象實例(用來返回一個整數值)  
        /// </summary>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <returns>OracleCommand 對象實例</returns>
    private static OracleCommand BuildIntCommand(OracleConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            OracleCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            command.Parameters.Add(new OracleParameter("ReturnValue",
                      OracleType.Int32, 4, ParameterDirection.ReturnValue,
              false, 0, 0, string.Empty, DataRowVersion.Default, null));
            return command;
        }
        #endregion
  }
}