rfc2259.txt
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2yz Positive completion reply 3yz Positive intermediate reply 4yz Transient negative completion reply 5yz Permanent negative completion reply 6yx Transient negative intermediate reply 7yx Permanent negative intermediate reply x0z Syntax or semantic problem x1z Informational reply x2z Related to transmission channel x3z Formatted (location coded) report for GUI x4z Status message to be displayed by GUI x5z Related to query resolver x6z Related to data repository x9z Component generating the error is unknown or suspect Table 2: Reply Code Structure ---------------------------------------------------------------------Elliott & Ordille Informational [Page 23] RFC 2259 SNQP January 1998 The GUI-related reply codes are only used if the server has been informed that it is communicating with a graphical user interface, via the imagui command. For such codes in the x3z space, digit "z" takes on the role of digit "y" in other codes. I.e. 735 are permanent negative intermediate replies about the query resolver. Table 3a and Table 3b list the defined regular (non-GUI) reply codes. Text messages for the reply codes may vary. The codes are sorted numerically. --------------------------------------------------------------------- 210-The following commands are available: 211-There are <n> relations defined: 212-There are <n> attributes in relation "<relation>": 213 Performing <comparison-type> type equality comparisons 214 Basic advice enabled. Query responses disabled. 214 Advice enabled for "<attribute>" in "<relation>" 215 GUI responses enabled 215 GUI responses disabled 216 Query responses enabled. Advice disabled. 220 <domain-name> <snqp-service-name> Query Service ready 221 <domain-name> closing transmission channel 250 All queries processed 250 All queries processed. Current through <time>. 251 All pending queries and responses discarded 340 Searching <n> data repositories 350 Send the query text, end with . 351 Partial response follows, ended with . 352 Beginning next query in batch 352 Beginning next query in batch. Previous current through <time>. 353 Starting next query. Any pending responses discarded. 354 The query will contact <n> data repositories, ended with . 355 There are <n> attributes that may constrain the query, ended with . 356 There are <n> possible values for attribute "<attribute>": 357 There are <n> constraining values for attribute "<attribute>": 420 Too many connections in progress. Try later. 421 Error in communicating with <snqp-service-name> 450 No query in progress 451 Cancel ignored Table 3a: Reply Codes ---------------------------------------------------------------------Elliott & Ordille Informational [Page 24] RFC 2259 SNQP January 1998 --------------------------------------------------------------------- 450 Query already in progress 490 Internal error: Invalid query reference number 491 System error: <error number or message> 492 Internal error: Out of client table space 499 <snqp-service-name> shutting down 500 Sorry, no help is available for "<command>" 501 Unknown command 502 Too many arguments for this command 502 Not enough arguments for this command 514 Advice not available 514 Advice not available on <attribute> 552 Query blocks are limited to one SQL query 553 Unknown relation 553 Unknown relation. Current through <TIME>. 554 Unknown attribute 555 Unknown comparison type 556 T-bounds not supported 557 Will not list more than <n> data repositories 557 Will not list more than <n> attribute values 557 Will not list more than <n> responses 557 Too many data repositories to list 557 Too many attribute values to list 557 Too many responses to list 557 Too many data repositories to search 651 <Error message from query resolver> 653 <Communications error> with <location> <location description> 660 <Error> from <location> <location description> 700 <SQL parse error message> 750 <SQL semantic error message> 751 <Error message from query resolver> 761 <Requirements error> for <location> <location description> 790 Internal error: <fatal error from SNQP server> Table 3b: Reply Codes (Continued) ---------------------------------------------------------------------Elliott & Ordille Informational [Page 25] RFC 2259 SNQP January 1998 Table 4 lists the defined GUI reply codes. Text messages for the reply codes may vary. The codes are sorted numerically. An explanation of the codes follows the table. --------------------------------------------------------------------- 331 nnnnnnn! <message> 331 nnnnnnn.mmmmmm <message> 331 nnnnnnn-mmmmmm <message> 730 nnnnnnnammmmmm e <parse error message> 735 nnnnnnnammmmmm e <semantic error message> 340 <status> Table 4: GUI Reply Codes --------------------------------------------------------------------- In Table 4, nnnnnnn is the line number in a query block, and mmmmmm is the column in the line. Both numbers begin counting with 1. The exclamation point response directs the program to list information after line n. The period response directs the program to break line n at column m. The hyphen response directs the program to flag line n at column m. Replies 730 and 735 direct the GUI to indicate the parsing or semantic error at line n, column m. Response 340 provides status information that can be displayed immediately in the GUI's status line. A sample status message is one that indicates which data repository is being contacted.5. Protocol Requirements SQL queries may often have more functionality then a server supports or an application demands. Moreover, query blocks larger than one SQL query, advice on query costs, some types of comparison operations or t-bounds need not be supported by a particular server. SNQP defines a minimal subset of functionality for a working SNQP protocol. Functionality beyond this subset is optional. Servers that do not support optional functionality must return replies that indicate this to the user. Table 5 lists the minimum functionality for an SNQP server.Elliott & Ordille Informational [Page 26] RFC 2259 SNQP January 1998 --------------------------------------------------------------------- Command Limitations --------------------------------------------------------------------- advice Not supported. attributes List the attributes for a relation. compare List type of comparison operation. At least one of CCSO and default comparison types must be supported. Wildcards in SQL query strings can be rejected by the query command with an appropriate semantic error message. help Explain the available SNQP commands. imagui Not supported. next Not supported. noadvice Supported, but has no effect since advice is not supported. noimagui Supported, but has no effect since imagui is not supported. query Submit a block containing one SQL query statement. The minimum supported SQL query statement is a selection query that performs equality comparisons between attribute values and constant strings. Conjunctions of such comparisons are supported. The minimum SQL query does not allow projections, but returns all the attributes for matching tuples. relations List the relations available through the SNQP server. stop End processing of current query. quit Terminate the query session. Table 5: Minimum SNQP Server Requirements (Commands do not support t-bounds) ---------------------------------------------------------------------6. Security Considerations SNQP clients and servers depend on the Domain Name Service. They are subject to all the security issues that arise in that context. This version of the SNQP protocol does not define procedures for protecting the information communicated to and from an SNQP server.Elliott & Ordille Informational [Page 27] RFC 2259 SNQP January 19987. References [1] American National Standards Institute. "SQL," ANSI Standard X3.135-1989. 1989. [2] H. Garcia-Molina, G. Wiederhold. "Read-Only Transactions in a Distributed Database," ACM Transactions on Database Systems 7(2), pp. 209-234. June 1982. [3] S. Dorner, P. Pomes. "The CCSO Nameserver: A Description," Computer and Communications Services Office Technical Report, University of Illinois, Urbana, USA. 1992. Available in the current "qi" distribution from <URL:ftp://uiarchive.cso.uiuc.edu/local/packages/ph> [4] J. Levine, T. Mason, D. Brown. "Parsing SQL," lex yacc, 2nd ed. O'Reilly and Associates, Inc. 1992. [5] Ordille, J., "The Internet Nomenclator Project", RFC 2258, January 1998. [6] J. Ordille. "Descriptive Name Services for Large Internets," Ph. D. Dissertation. University of Wisconsin. 1993. <URL:http://cm.bell-labs.com/cm/cs/doc/93/12-01.ps.gz> [7] J. Ordille, B. Miller. "Distributed Active Catalogs and Meta-Data Caching in Descriptive Name Services," Thirteenth International IEEE Conference on Distributed Computing Systems, pp. 120-129. May 1993. <URL:http://cm.bell-labs.com/cm/cs/doc/93/5-01.ps.gz> [8] J. Ordille. "Nomenclator Home Page." 1997. <URL:http://cm.bell-labs.com/cm/cs/what/nomenclator/> [9] Postel, J., "Simple Mail Transfer Protocol", STD 10, RFC 821, August 1982. [10 Yeong, W., Howes, T., and S. Kille. "Lightweight Directory Access Protocol", RFC 1777, March 1995.Elliott & Ordille Informational [Page 28] RFC 2259 SNQP January 19988. Authors' Addresses Jim Elliott Epic Systems Corporation 5301 Tokay Boulevard Madison, WI 53711 USA EMail: jim@apocalypse.org Joann J. Ordille Bell Labs, Lucent Technologies Computing Sciences Research Center 700 Mountain Avenue, Rm 2C-301 Murray Hill, NJ 07974 USA EMail: joann@bell-labs.comElliott & Ordille Informational [Page 29] RFC 2259 SNQP January 19989. Full Copyright Statement Copyright (C) The Internet Society (1998). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.Elliott & Ordille Informational [Page 30] ⌨️ 快捷键说明
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