常用操作Oracle数据库的类

   public const string CONN_STRING = "user id=用户名;data source=数据源;password=密码";

         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;
            cmd.CommandType = cmdType;

            if (trans != null)
                cmd.Transaction = trans;

            if (cmdParms != null)
            {
                foreach (OracleParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }

    public static int ExecuteNonQuery(string connString, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
        {
            OracleCommand cmd = new OracleCommand();
            using (OracleConnection conn = new OracleConnection(connString))
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
                int val = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                return val;
            }
        }

         public static object ExecuteScalar(string connString, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
        {
            OracleCommand cmd = new OracleCommand();

            using (OracleConnection conn = new OracleConnection(connString))
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
                object val = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
                return val;
            }
        }

         public static OracleDataReader ExecuteReader(string connString, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
        {
            OracleCommand cmd = new OracleCommand();
            OracleConnection conn = new OracleConnection(connString);
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
                OracleDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch (Exception e)
            {
                conn.Close();
                throw e;
            }
        }

         public static int ExecuteNonQuery(OracleTransaction trans, CommandType cmdType, string cmdText, params OracleParameter[] 　　　　          cmdParms)
        {
            OracleCommand cmd = new OracleCommand();
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, cmdParms);
            int val = 9;
            try
            {
                val = cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                string ss = ex.ToString();
                throw ex;
            }

            cmd.Parameters.Clear();
            return val;
        }

         public static DataSet Adapter(string connString, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
        {
            OracleCommand cmd = new OracleCommand();
            DataSet ds = new DataSet();
            using (OracleConnection conn = new OracleConnection(connString))
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
                OracleDataAdapter ada = new OracleDataAdapter(cmd);
                ada.Fill(ds);
                cmd.Parameters.Clear();
                return ds;
            }

        }

        public static DataSet Adapter( OracleTransaction ts, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
        {
            OracleCommand cmd = new OracleCommand();
            cmd.Transaction = ts;
            DataSet ds = new DataSet();
            PrepareCommand(cmd, ts.Connection, null, cmdType, cmdText, cmdParms);
            OracleDataAdapter ada = new OracleDataAdapter(cmd);
            ada.Fill(ds);
            cmd.Parameters.Clear();
             return ds;
         }

         public static DataSet Adapter(OracleConnection conn, CommandType cmdType, string cmdText, params OracleParameter[] cmdParms)
        {
            OracleCommand cmd = new OracleCommand();
            DataSet ds = new DataSet();
            PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
            OracleDataAdapter ada = new OracleDataAdapter(cmd);
            ada.Fill(ds);
            cmd.Parameters.Clear();
             return ds;
         }