Oracle帮助类

/// 
    /// 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。
	/// 
	public abstract class DbHelperOra
	{
        //数据库连接字符串(web.config来配置),可以动态更改connectionString支持多数据库.		
        public static string connectionString = PubConstant.ConnectionString;     
		public DbHelperOra()
		{			
		}

        #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;
            }
        }

        public static int GetSequence(string SequenceName)
        {
            string strsql = "select " + SequenceName + ".nextval from dual";
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 0;
            }
            else {
                return int.Parse(obj.ToString());
            }
        } 
        #endregion

        public static string GetServerDateTime()
        {
            //string SQLString = "Select To_Char(SYSDATE,'yyyyMMddHHmmss') from dual";
            string datetime = "";
            string SQLString = "select SYSDATE from dual";
            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                using (OracleCommand cmd = new OracleCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        OracleDataReader dataReader = cmd.ExecuteReader();
                        if (dataReader.Read())
                        {
                            datetime = dataReader[0].ToString();
                        }
                        dataReader.Close();
                    }
                    catch (System.Data.OracleClient.OracleException E)
                    {
                        connection.Close();
                        throw new Exception(E.Message);
                    }
                }
            }
            return datetime;
        }
		#region  执行简单SQL语句

		/// 
		/// 执行SQL语句,返回影响的记录数
		/// 
		/// SQL语句
		/// 影响的记录数
		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);
					}
				}				
			}
		}
		
		/// 
		/// 执行多条SQL语句,实现数据库事务。
		/// 
		/// 多条SQL语句		
		public static bool 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;n1)
						{
							cmd.CommandText=strsql;
							cmd.ExecuteNonQuery();
						}
					}										
					tx.Commit();
                    return true;
				}
				catch //(System.Data.OracleClient.OracleException E)
				{		
					tx.Rollback();
                    return false;
					//throw new Exception(E.Message);
				}
			}
		}
		/// 
		/// 执行带一个存储过程参数的的SQL语句。
		/// 
		/// SQL语句
		/// 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
		/// 影响的记录数
		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();
				}	
			}
		}		
		/// 
		/// 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)
		/// 
		/// SQL语句
		/// 图像字节,数据库的字段类型为image的情况
		/// 影响的记录数
		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();
				}				
			}
		}
		
		/// 
		/// 执行一条计算查询结果语句,返回查询结果(object)。
		/// 
		/// 计算查询结果语句
		/// 查询结果(object)
		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);
					}	
				}
			}
		}
		/// 
        /// 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 )
		/// 
		/// 查询语句
		/// OracleDataReader
		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);
			}			
			
		}		
		/// 
		/// 执行查询语句,返回DataSet
		/// 
		/// 查询语句
		/// DataSet
		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 执行带参数的SQL语句

		/// 
		/// 执行SQL语句,返回影响的记录数
		/// 
		/// SQL语句
		/// 影响的记录数
		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);
					}
				}				
			}
		}
        /// 
        /// 执行多条SQL语句,实现数据库事务。
        /// 
        /// SQL语句的哈希表(key为sql语句,value是该语句的OracleParameter[])
        public static bool ExecuteSqlTran(System.Collections.Generic.List SQLStringList)
        {
            using (OracleConnection conn = new OracleConnection(connectionString))
            {
                conn.Open();
                using (OracleTransaction trans = conn.BeginTransaction())
                {
                    OracleCommand cmd = new OracleCommand();
                    try
                    {
                        //循环
                        foreach (Hashtable item in SQLStringList)
                        {
                            foreach (DictionaryEntry myDE in item)
                            {
                                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();
                        return true;
                    }
                    catch
                    {
                        trans.Rollback();
                        //throw;
                        return false;
                    }
                    finally
                    {
                        conn.Close();
                        conn.Dispose();//打开后需要关闭释放
                    }
                }
            }
        }

        public static bool Manange(System.Collections.Hashtable hash)
        {
            bool b = false;
            foreach (System.Collections.DictionaryEntry entry in hash)
            {
                OracleParameter[] parameters = (OracleParameter[])entry.Value;
                int rows = ExecuteSql(entry.Key.ToString(), parameters);
                if (rows > 0)
                {
                    b = true;
                }
                else
                {
                    b = false;
                }
            }
            return b;
        }
		/// 
		/// 执行多条SQL语句,实现数据库事务。
		/// 
		/// SQL语句的哈希表(key为sql语句,value是该语句的OracleParameter[])
		public static bool 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();
                        return true;
                    }
                    catch
                    {
                        trans.Rollback();
                        //throw;
                        return false;
                    }
                    finally
                    {
                        conn.Close();
                        conn.Dispose();//打开后需要关闭释放
                    }
				}				
			}
		}
	
				
		/// 
		/// 执行一条计算查询结果语句,返回查询结果(object)。
		/// 
		/// 计算查询结果语句
		/// 查询结果(object)
		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);
					}					
				}
			}
		}
		
		/// 
        /// 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 )
		/// 
		/// 查询语句
		/// OracleDataReader
		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);
			}					
			
		}		
		
		/// 
		/// 执行查询语句,返回DataSet
		/// 
		/// 查询语句
		/// DataSet
		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 存储过程操作

		/// 
        /// 执行存储过程 返回SqlDataReader ( 注意:调用该方法后,一定要对SqlDataReader进行Close )
		/// 
		/// 存储过程名
		/// 存储过程参数
		/// OracleDataReader
		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;			
		}
		
		
		/// 
		/// 执行存储过程
		/// 
		/// 存储过程名
		/// 存储过程参数
		/// DataSet结果中的表名
		/// DataSet
		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;
			}
		}

		
		/// 
		/// 构建 OracleCommand 对象(用来返回一个结果集,而不是一个整数值)
		/// 
		/// 数据库连接
		/// 存储过程名
		/// 存储过程参数
		/// OracleCommand
		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;			
		}
		
		/// 
		/// 执行存储过程,返回影响的行数		
		/// 
		/// 存储过程名
		/// 存储过程参数
		/// 影响的行数
		/// 
		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;
			}
		}
		
		/// 
		/// 创建 OracleCommand 对象实例(用来返回一个整数值)	
		/// 
		/// 存储过程名
		/// 存储过程参数
		/// OracleCommand 对象实例
		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	

	}

 

转载于:https://www.cnblogs.com/sunliyuan/p/6204716.html

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