数据库 oracle 函数

static OracleConnection mQracleConnecting = null;
        public static OracleConnection QracleConnecting
        {
            get
            {
                try
                {
                    if(mQracleConnecting ==null)
                        mQracleConnecting = new OracleConnection(jksg);
                    if (mQracleConnecting.State != ConnectionState.Open)
                        mQracleConnecting.Open();
                    return mQracleConnecting;
                }
                catch (Exception)
                {
                    return null;
                }
            }

        }

        public static DataTable DBGetDataTable(string sql,string conn)
        {
            DataTable dataSet = new DataTable();
            OracleDataAdapter OraDA = new OracleDataAdapter(sql, conn);
            OraDA.Fill(dataSet);
            return dataSet;
        }
        public static DataTable DBGetDataTable(string sql, OracleConnection conn)
        {
            DataTable dataSet = new DataTable();
            OracleDataAdapter OraDA = new OracleDataAdapter(sql, conn);
            OraDA.Fill(dataSet);
            return dataSet;
        }


        // 执行SQL语句,返回所影响的行数   
        public static int ExecuteSQL(string sql)
        {
            int Cmd = ;
            OracleCommand command = new OracleCommand(sql, QracleConnecting);
            try
            {
                Cmd = command.ExecuteNonQuery();
            }
            catch
            {
            }
            return Cmd;
        } 

        public static int ExecuteSQL_Update(string sql)
        {
            OracleDataAdapter OraDA = new OracleDataAdapter(sql, QracleConnecting);
            return OraDA.UpdateCommand.ExecuteNonQuery();
        }
        public static int ExecuteSQL_Insert(string sql)
        {
            OracleDataAdapter OraDA = new OracleDataAdapter(sql, QracleConnecting);
            return OraDA.InsertCommand.ExecuteNonQuery();
        }