文档视界

最新最全的文档下载
当前位置:文档视界 > SAP_HANA_Database_SQL_command_network_protocol_en

SAP_HANA_Database_SQL_command_network_protocol_en

SAP_HANA_Database_SQL_command_network_protocol_en

SAP HANA Database – SQL Command Network Protocol Reference ?SAP HANA Platform SPS 07

Target Audience

■Developers

Public

Document Version 1.0 – 27-11-2013

Copyright

? 2013 SAP AG or an SAP affiliate company. All rights reserved.

No part of this publication may be reproduced or transmitted in any form or for any purpose without the express permission of SAP AG. The information contained herein may be changed without prior notice.

Some software products marketed by SAP AG and its distributors contain proprietary software components of other software vendors.

Adobe, the Adobe logo, Acrobat, PostScript, and Reader are trademarks or registered trademarks of Adobe Systems Incorporated in the United States and other countries.

Apple, App Store, FaceTime, iBooks, iPad, iPhone, iPhoto, iPod, iTunes, Multi-Touch, Objective-C, Retina, Safari, Siri, and Xcode are trademarks or registered trademarks of Apple Inc.

Bluetooth is a registered trademark of Bluetooth SIG Inc.

Citrix, ICA, Program Neighborhood, MetaFrame now XenApp, WinFrame, VideoFrame, and MultiWin are trademarks or registered trademarks of Citrix Systems Inc.

Computop is a registered trademark of Computop Wirtschaftsinformatik GmbH.

Edgar Online is a registered trademark of EDGAR Online Inc., an R.R. Donnelley & Sons Company.

Facebook, the Facebook and F logo, FB, Face, Poke, Wall, and 32665 are trademarks of Facebook.

Google App Engine, Google Apps, Google Checkout, Google Data API, Google Maps, Google Mobile Ads, Google Mobile Updater, Google Mobile, Google Store, Google Sync, Google Updater, Google Voice, Google Mail, Gmail, YouTube, Dalvik, and Android are trademarks or registered trademarks of Google Inc.

HP is a registered trademark of the Hewlett-Packard Development Company L.P.

HTML, XML, XHTML, and W3C are trademarks, registered trademarks, or claimed as generic terms by the Massachusetts Institute of Technology (MIT), European Research Consortium for Informatics and Mathematics (ERCIM), or Keio University.

IBM, DB2, DB2 Universal Database, System i, System i5, System p, System p5, System x, System z, System z10, z10, z/VM, z/OS, OS/390, zEnterprise, PowerVM, Power Architecture, Power Systems, POWER7, POWER6+, POWER6, POWER, PowerHA, pureScale, PowerPC, BladeCenter, System Storage, Storwize, XIV, GPFS, HACMP, RETAIN, DB2 Connect, RACF, Redbooks, OS/2, AIX, Intelligent Miner, WebSphere, Tivoli, Informix, and Smarter Planet are trademarks or registered trademarks of IBM Corporation.

Microsoft, Windows, Excel, Outlook, PowerPoint, Silverlight, and Visual Studio are registered trademarks of Microsoft Corporation.

INTERMEC is a registered trademark of Intermec Technologies Corporation.

IOS is a registered trademark of Cisco Systems Inc.

The Klout name and logos are trademarks of Klout Inc.

Linux is the registered trademark of Linus Torvalds in the United States and other countries. Motorola is a registered trademark of Motorola Trademark Holdings LLC.

Mozilla and Firefox and their logos are registered trademarks of the Mozilla Foundation. Novell and SUSE Linux Enterprise Server are registered trademarks of Novell Inc. OpenText is a registered trademark of OpenText Corporation.

Oracle and Java are registered trademarks of Oracle and its affiliates.

QR Code is a registered trademark of Denso Wave Incorporated.

RIM, BlackBerry, BBM, BlackBerry Curve, BlackBerry Bold, BlackBerry Pearl, BlackBerry Torch, BlackBerry Storm, BlackBerry Storm2, BlackBerry PlayBook, and BlackBerry AppWorld are trademarks or registered trademarks of Research in Motion Limited.

SAVO is a registered trademark of The Savo Group Ltd.

The Skype name is a trademark of Skype or related entities.

Twitter and Tweet are trademarks or registered trademarks of Twitter.

UNIX, X/Open, OSF/1, and Motif are registered trademarks of the Open Group.

Wi-Fi is a registered trademark of Wi-Fi Alliance.

SAP, R/3, ABAP, BAPI, SAP NetWeaver, Duet, PartnerEdge, ByDesign, SAP BusinessObjects Explorer, StreamWork, SAP HANA, the Business Objects logo, BusinessObjects, Crystal Reports, Crystal Decisions, Web Intelligence, Xcelsius, Sybase, Adaptive Server, Adaptive Server Enterprise, iAnywhere, Sybase 365, SQL Anywhere, Crossgate, B2B 360° and B2B 360° Services, m@gic EDDY, Ariba, the Ariba logo, Quadrem, b-process, Ariba Discovery, SuccessFactors, Execution is the Difference, BizX Mobile Touchbase, It's time to love work again, SuccessFactors Jam and BadAss SaaS, and other SAP products and services mentioned herein as well as their respective logos are trademarks or registered trademarks of SAP AG in Germany or an SAP affiliate company.

All other product and service names mentioned are the trademarks of their respective companies. Data contained in this document serves informational purposes only. National product specifications may vary.

These materials are subject to change without notice. These materials are provided by SAP AG and its affiliated companies ("SAP Group") for informational purposes only, without representation or warranty of any kind, and SAP Group shall not be liable for errors or omissions with respect to the materials. The only warranties for SAP Group products and services are those that are set forth in the express warranty statements accompanying such products and services, if any. Nothing herein should be construed as constituting an additional warranty.

Icons in Body Text

Icon Meaning

SAP_HANA_Database_SQL_command_network_protocol_en

Caution

SAP_HANA_Database_SQL_command_network_protocol_en

Example

SAP_HANA_Database_SQL_command_network_protocol_en

Note

SAP_HANA_Database_SQL_command_network_protocol_en

Recommendation

SAP_HANA_Database_SQL_command_network_protocol_en

Syntax

Additional icons are used in SAP Library documentation to help you identify different types of information at a glance. For more information, see Help on Help→General Information

Classes and Information Classes for Business Information Warehouse on the first page of any version of SAP Library.

Typographic Conventions

Type Style Description

Example text Words or characters quoted from the screen. These include field

names, screen titles, pushbuttons labels, menu names, menu paths,

and menu options.

Cross-references to other documentation.

Example text Emphasized words or phrases in body text, graphic titles, and table

titles.

EXAMPLE TEXT Technical names of system objects. These include report names,

program names, transaction codes, table names, and key concepts of a

programming language when they are surrounded by body text, for

example, SELECT and INCLUDE.

Example text Output on the screen. This includes file and directory names and their

paths, messages, names of variables and parameters, source text, and

names of installation, upgrade and database tools.

Example text Exact user entry. These are words or characters that you enter in the

system exactly as they appear in the documentation.

Variable user entry. Angle brackets indicate that you replace these

words and characters with appropriate entries to make entries in the

system.

EXAMPLE TEXT Keys on the keyboard, for example, F2 or ENTER.

Introduction (8)

Content Overview (8)

Terminology (8)

Protocol Modification (9)

Message Format (10)

Message Header (10)

Segment Header (11)

Segment Kind (11)

Message Type (12)

Command Options (12)

Function Code (13)

Part Header (13)

Part Kind (13)

Part Attributes (14)

Use of Parts in Request Messages (15)

Use of Parts in Reply Messages (16)

Type Codes (17)

Part Data Format (19)

Option Part Format (19)

Multi-Line Option Part Format (20)

COMMAND (20)

RESULTSET (20)

ERROR (21)

STATEMENTID (21)

TRANSACTIONID (21)

ROWSAFFECTED (21)

RESULTSETID (22)

TOPOLOGYINFORMATION (22)

TABLELOCATION (23)

READLOBREQUEST (23)

READLOBREPLY (23)

ABAPISTREAM (24)

ABAPOSTREAM (24)

COMMANDINFO (24)

WRITELOBREQUEST (25)

WRITELOBREPLY (25)

PARAMETERS (25)

AUTHENTICATION (25)

SESSIONCONTEXT (26)

PARTITIONINFORMATION (27)

OUTPUTPARAMETERS (28)

CONNECTOPTIONS (28)

COMMITOPTIONS (32)

FETCHOPTIONS (32)

FETCHSIZE (33)

PARAMETERMETADATA (33)

RESULTSETMETADATA (34)

FINDLOBREQUEST (34)

FINDLOBREPLY (35)

ITABSHM (35)

CLIENTINFO (35)

STREAMDATA (36)

BATCHPREPARE (36)

BATCHEXECUTE (36)

TRANSACTIONFLAGS (36)

Input Field Format (36)

TINYINT (36)

SMALLINT (36)

INT (36)

BIGINT (37)

DECIMAL (37)

REAL (37)

DOUBLE (37)

STRING/NSTRING (37)

BINARY (37)

BLOB/CLOB/NCLOB (37)

DATE (38)

TIME (38)

TIMESTAMP (38)

ABAPSTRUCT (38)

LONGDATE (39)

SECONDDATE (39)

DAYDATE (39)

SECONDTIME (39)

Output Field Format (39)

TINYINT (39)

SMALLINT (40)

INT (40)

DECIMAL (40)

REAL (41)

DOUBLE (41)

STRING/NSTRING (41)

BINARY (41)

BLOB/CLOB/NCLOB (41)

DATE (42)

TIME (42)

TIMESTAMP (42)

ABAPITAB (42)

ABAPSTRUCT (42)

LONGDATE (42)

SECONDDATE (42)

DAYDATE (43)

SECONDTIME (43)

Usage Scenarios (43)

Communication Initialization (43)

Authentication and Connect (43)

SCRAMSHA256 Authentication (45)

GSS Authentication (46)

SAML Authentication (47)

Session Cookie Authentication (49)

Statement Execution (50)

Direct Statement Execution (50)

Preparing a Statement (51)

Executing a Statement (51)

Fetching Result Data (51)

Writing Large Object Data (52)

Reading Large Object Data (52)

ABAP Stream Handling (53)

Distributed Transaction Handling (53)

Statement Routing (53)

Definition (53)

Preconditions (54)

Glossary (54)

Introduction

This document describes the SQL Command Network Protocol of the SAP HANA database, the protocol used by SAP HANA database clients to communicate with the SAP HANA database.

Content Overview

This document is divided in to the following chapters:

Chapter 2: Message Format

This chapter describes the binary message format used in the communication, and explains the purpose of the various protocol elements.

Chapter 3: Usage Scenarios

This chapter discusses usage scenarios for the various messages defined in the SQL Command Network Protocol, and defines usage sequences to utilize certain functionalities of the database server, such as:

?User authentication and connect process

?Execution of prepared statements

?Handling of large object data

?Usage of distributed transaction handling

Terminology

Within this document, a message describes requests or replies exchanged between client and server. A request is always a message sent by the client, and a reply is always the message sent by the server.

The following abbreviations are used to describe data types in message formats:

Abbreviation Data Type C Data Type1

I1 1-byte integer value char

UI1 1-byte unsigned integer value unsigned char B 1-byte unsigned integer value, or “one byte” unsigned char I2 2-byte integer in little-endian format short

UI2 2-byte unsigned integer in little-endian format unsigned short BI2 2-byte integer in big-endian format unsigned short I4 4-byte integer in little-endian format int

NI4 4-byte integer in client native (big/little-endian) format int

UI4 4-byte unsigned integer in little-endian format unsigned int

I8 8-byte integer in little-endian format long

NUI8 8-byte unsigned integer in client native (big/little-

endian) format

unsigned long

FLOAT IEEE single precision floating point value in little-

endian format

float

1 For a Linux GCC in an x86-64 architecture environment

DOUBLE IEEE double precision floating point value in little-

endian format

double

X[n] Array of n elements of data type X. -

Protocol Modification

The SQL Command Network Protocol must be kept stable so that clients are able to communicate with recent version server software, and vice versa. A more recent client may have to degrade the usage of the protocol depending on the server version, and a more recent server may have to use only certain features if non-recent client software is detected. Detection is performed during connection by exchanging connect options, which specify the required behavior of the client, and getting the supported feature set from the server. This detection does not perform global versioning, but enables or disables feature flags, or modifies certain functionality.

Additions to the protocol usually require careful modification and extension of the exchanged connect options.

Message Format

This chapter discusses the format of messages exchanged between the client and the server. The communication between client and server is completely synchronous, such that the client can only send the next request once the reply of the previous request has been fully received.

A client is, however, free to continue with its own processing, or communicate with other servers of a SAP HANA database system while waiting for the answer.

A message consists of a fixed part, called the message header, and a variable length message buffer. The message buffer contains message segments, which, in turn, consist of a segment header and a segment buffer. The segment buffer contains parts, and the parts have a fixed length part header, and a variable length buffer.

+----------------------------+

| MESSAGE HEADER |

| +------------------------+ |

| | SEGMENT HEADER | |

| | +--------------------+ | |

| | | PART HEADER | | |

| | +--------------------+ | |

| | | PART BUFFER | | |

| | +--------------------+ | |

| | ... | |

| +------------------------+ |

| ... |

+----------------------------+

There is one exception to this format – during the communication initialization a different message pair is exchanged, which is necessary to distinguish the current and former protocol variants.

Message Header

The message header is a structure which has a size of 32-bytes, and consists of the following fields:

+---------+-----------+-------------+-----------+--------+-------------+--------+

|SESSIONID|PACKETCOUNT|VARPARTLENGTH|VARPARTSIZE|NOOFSEGM|PACKETOPTIONS|RESERVED|

+---------+-----------+-------------+-----------+--------+-------------+--------+

Field Data Type Description

SESSIONID I8 Session identifier

PACKETCOUNT I4 Packet sequence number in this session. Packets having the same sequence number belong to one

request/response pair.

VARPARTLENGTH UI4 Used space in packet, maximum is 2G -1 VARPARTSIZE UI4 Total space in packet, maximum is 2G -1 NOOFSEGM I2 Number of segments in packet PACKETOPTIONS I1 Reserved, do not use

RESERVED B[9] Reserved, do not use

Segment Header

The segment header has a length of 24-bytes. There are different segment header structures for request and reply, but both have the same definition for first 13-bytes of the structure. They are structured as follows:

Request Segment Header

+---------------+------------+-----------+-----------+-------------+

| SEGMENTLENGTH | SEGMENTOFS | NOOFPARTS | SEGMENTNO | SEGMENTKIND | . . .

+---------------+------------+-----------+-----------+-------------+

+-------------+--------+----------------+-----------+

. . . | MESSAGETYPE | COMMIT | COMMANDOPTIONS | RESERVED1 |

+-------------+--------+----------------+-----------+

Reply Segment Header

+---------------+------------+-----------+-----------+-------------+

| SEGMENTLENGTH | SEGMENTOFS | NOOFPARTS | SEGMENTNO | SEGMENTKIND | . . .

+---------------+------------+-----------+-----------+-------------+

+-----------+--------------+-----------+

. . . | RESERVED2 | FUNCTIONCODE | RESERVED3 |

+-----------+--------------+-----------+

Field Data Type Description

SEGMENTLENGTH I4 Length of the segment, including the header SEGMENTOFS I4 Offset of the segment within the message buffer NOOFPARTS I2 Number of contained parts

SEGMENTNO I2 Number of segments within packet

SEGMENTKIND I1 See Segment Kind

MESSAGETYPE I1 See Message Type

COMMIT I1 Whether the command is committed COMMANDOPTIONS I1 See Command Options

RESERVED1 B[8] Reserved, do not use

RESERVED2 I1 Reserved, do not use

FUNCTIONCODE I2 See Function Code

RESERVED3 B[8] Reserved, do not use

Segment Kind

This field is the last field of the segment header part, common to all types (kinds) of segments, and defines the segment kind, which further specifies the layout of the remaining segment header structure. The following values are defined:

Value Description

0 Reserved for invalid segments, do not use

1 Request segment

2 Reply segment

5 Error segment (reply segment containing error)

Message Type

The message type defines the action requested from the database server. The following values are defined:

Value Identifier Description

0 NIL Reserved for invalid messages, do not use

2 EXECUTEDIRECT Directly execute SQL statement

3 PREPARE Prepare an SQL statement

4 ABAPSTREAM Handle ABAP stream parameter of database procedure

5 XA_START Start a distributed transaction

6 XA_JOIN Join a distributed transaction

13 EXECUTE Execute a previously prepared SQL statement

16 WRITELOB Writes large object data

17 READLOB Reads large object data

18 FINDLOB Finds data in a large object

25 PING Reserved (was PING message)

65 AUTHENTICATE Sends authentication data

66 CONNECT Connects to the database

67 COMMIT Commits current transaction

68 ROLLBACK Rolls back current transaction

69 CLOSERESULTSET Closes result set

70 DROPSTATEMENTID Drops prepared statement identifier

71 FETCHNEXT Fetches next data from result set

72 FETCHABSOLUTE Moves the cursor to the given row number and fetches

the data.

73 FETCHRELATIVE Moves the cursor a number of rows relative to the

position, either positive or negative, and fetches the data.

74 FETCHFIRST Moves the cursor to the first row and fetches the data.

75 FETCHLAST Moves the cursor to the last row and fetches the data.

77 DISCONNECT Disconnects session

78 EXECUTEITAB Executes command in Fast Data Access mode

79 FETCHNEXTITAB Fetches next data for ITAB object in Fast Data Access mode

80 INSERTNEXTITAB Inserts next data for ITAB object in Fast Data Access

mode

81 BATCHPREPARE Reserved (was multiple statement preparation) Command Options

The command options field is a bit set that allows specific options for the sent message to be defined:

Bit Identifier Description

1 RESERVED_FIELD Reserved field, do not use

3 HOLD_CURSORS_OVER_COMMIT Keeps result set created by this command over commit time

4 EXECUTE_LOCALLY Executes command only on local partitions of affected partitioned table

5 SCROLL_INSENSITIVE Marks result set created by this command as scroll insensitive

Function Code

The function code identifies the nature of the statement or functionality that has been prepared or executed.

Value Identifier Description

0 NIL Invalid command or function

1 DDL DDL statement

2 INSERT INSERT statement

3 UPDATE UPDATE statement

4 DELETE DELETE statement

6 SELECTFORUPDATE SELECT … FOR UPDATE statement

7 EXPLAIN EXPLAIN statement

8 DBPROCEDURECALL CALL statement

9 DBPROCEDURECALLWITHRESULT CALL statement returning one or more

results

10 FETCH FETCH message

11 COMMIT COMMIT message or statement

12 ROLLBACK ROLLBACK message or statement

13 SAVEPOINT Reserved, do not use

14 CONNECT CONNECT or AUTHENTICATION message

15 WRITELOB WRITELOB message

16 READLOB READLOB message

17 PING Reserved, do not use

18 DISCONNECT DISCONNECT message

19 CLOSECURSOR CLOSECURSOR message

20 FINDLOB FINDLOB message

21 ABAPSTREAM ABAPSTREAM message

22 XASTART XA_START message

23 XAJOIN XA_JOIN message

Part Header

The part header is 16-bytes in length, and has the following structure:

+--------+--------------+-------------+----------------+------------+----------+

|PARTKIND|PARTATTRIBUTES|ARGUMENTCOUNT|BIGARGUMENTCOUNT|BUFFERLENGTH|BUFFERSIZE|

+--------+--------------+-------------+----------------+------------+----------+

The header fields are defined as follows:

Field Data Type Description

PARTKIND I1 Specifies nature of part data (see Part Kind) PARTATTRIBUTES I1 Further attributes of part (see Part Attributes) ARGUMENTCOUNT I2 Argument count, number of elements in part data

BIGARGUMENTCOUNT I4 Argument count, number of elements in part data (only for some part kinds)

BUFFERLENGTH I4 Length of part buffer in bytes (used space) BUFFERSIZE I4 Length in packet remaining without this part

Part Kind

The following values are defined for the PARTKIND field:

Value Identifier Description

0 NIL Reserved for invalid part, do not use

3 COMMAND SQL Command Data

5 RESULTSET Tabular result set data

6 ERROR Error information

10 STATEMENTID Prepared statement identifier

11 TRANSACTIONID Transaction identifier

12 ROWSAFFECTED Number of affected rows of DML statement

13 RESULTSETID Identifier of result set

15 TOPOLOGYINFORMATION Topology information

16 TABLELOCATION Location of table data

17 READLOBREQUEST Request data of READLOB message

18 READLOBREPLY Reply data of READLOB message

25 ABAPISTREAM ABAP input stream identifier

26 ABAPOSTREAM ABAP output stream identifier

27 COMMANDINFO Command information

28 WRITELOBREQUEST Request data of WRITELOB message

30 WRITELOBREPLY Reply data of WRITELOB message

32 PARAMETERS Parameter data

33 AUTHENTICATION Authentication data

34 SESSIONCONTEXT Session context information

39 STATEMENTCONTEXT Statement visibility context

40 PARTITIONINFORMATION Table partitioning information

41 OUTPUTPARAMETERS Output parameter data

42 CONNECTOPTIONS Connect options

43 COMMITOPTIONS Commit options

44 FETCHOPTIONS Fetch options

45 FETCHSIZE Number of rows to fetch

47 PARAMETERMETADATA Parameter metadata (type and length information)

48 RESULTSETMETADATA Result set metadata (type, length, and name information)

49 FINDLOBREQUEST Request data of FINDLOB message

50 FINDLOBREPLY Reply data of FINDLOB message

51 ITABSHM Information on shared memory segment used for ITAB transfer

53 ITABCHUNKMETADATA Reserved, do not use

55 ITABMETADATA Information on ABAP ITAB structure for ITAB transfer

56 ITABRESULTCHUNK ABAP ITAB data chunk

57 CLIENTINFO Client information values

58 STREAMDATA ABAP stream data

59 OSTREAMRESULT ABAP output stream result information

60 FDAREQUESTMETADATA Information on memory and request details for FDA

request

61 FDAREPLYMETADATA Information on memory and request details for FDA

reply

62 BATCHPREPARE Reserved, do not use

63 BATCHEXECUTE Reserved, do not use

64 TRANSACTIONFLAGS Transaction handling flags

65 ROWDATAPARTMETADATA Reserved, do not use

66 COLDATAPARTMETADATA Reserved, do not use

Part Attributes

The part attributes make up a bit set to indicate special features of a certain part. The following values are defined:

Bit Identifier Description

0 LASTPACKET Last part in a sequence of parts (FETCH, array command

EXECUTE)

1 NEXTPACKET Part in a sequence of parts

2 FIRSTPACKET First part in a sequence of parts

3 ROWNOTFOUND Empty part, caused by “row not found” error

4 RESULTSETCLOSED The result set that produced this part is closed

5 RESERVED5 Reserved, do not use

6 RESERVED6 Reserved, do not use

7 RESERVED7 Reserved, do not use

Use of Parts in Request Messages

The following table shows the parts that can be used in various request message types. The letter X denotes the default relationship between the part and message. Any letters other than X denote a conditional relationship, which are described in further detail below the table. MESSAGE TYPE PART KIND E X E C U T E D I R E C T P R E P A R E A B A P S

T R E A M X A _S T A R T X A _J O I N E X E C U T E W R I T E L O B

R E

A D L O

B F I N D L O B A U T H E N T I

C A T E C O N N E C T C O M M I T R O L

L B A C K F E

T C H

N E

X T

D I

S C O N N E C

T

C L O S E R E S U L T S E T

D R O P S T A T

E M E N T I D

E X E

C U T E

I

T A B F E

T C H N E X

T I T A

B

I

N S

E

R

T

N E

X

T

I T

A

B

NIL COMMAND X X RESULTSET ERROR STATEMENTID X X TRANSACTIONID X ROWSAFFECTED RESULTSETID X X TOPOLOGYINFORMATION TABLELOCATION READLOBREQUEST X READLOBREPLY ABAPISTREAM X ABAPOSTREAM X COMMANDINFO X X X WRITELOBREQUEST X WRITELOBREPLY PARAMETERS B AUTHENTICATION X X SESSIONCONTEXT A A A A A A A A A A A A A A A A A A A A STATEMENTCONTEXT A A A A A A A A A A A A A A A A A A A A PARTITIONINFORMATION OUTPUTPARAMETERS CONNECTOPTIONS X COMMITOPTIONS X X FETCHOPTIONS X FETCHSIZE X

PARAMETERMETADATA RESULTSETMETADATA FINDLOBREQUEST X FINDLOBREPLY ITABSHM ITABCHUNKMETADATA ITABMETADATA ITABRESULTCHUNK CLIENTINFO C C C C STREAMDATA X OSTREAMRESULT X FDAREQUESTMETADATA FDAREPLYMETADATA BATCHPREPARE BATCHEXECUTE TRANSACTIONFLAGS

A – This part can always be sent if distributed transaction handling requires it

B – Only in the case that the prepared statement has input parameters

C – In the case the client application did set information flags

Use of Parts in Reply Messages

The following table shows the parts that can be used in various reply message types. The letter X denotes the default relationship between the part and message. Any letters other than X denote a conditional relationship, which are described in further detail below the table. MESSAGE TYPE PART KIND E X E C U T E D I R E C T P R E P A R E

A B A P S T R E A M X A _S T A R T X A _J O I N E X E C U T E

W R I T E L O B R E A D L O B F I

N D L O

B A U T H E

N T I C A T E C O N N E C T

C O M M I T R O L L B A C K

F E T C H N E X T D I

S C

O

N N E C

T C L O S E R E S U L T S E T

D R O P S T A T

E M E N T I

D

E X E

C

U T

E

I

T

A

B F E

T

C H

N E

X

T I

T A

B

I

N S

E

R

T

N E

X

T I

T

A B

NIL COMMAND RESULTSET A A ERROR B B B B B B B B B

STATEMENTID X TRANSACTIONID X ROWSAFFECTED C C RESULTSETID A A TOPOLOGYINFORMATION TABLELOCATION E READLOBREQUEST READLOBREPLY X ABAPISTREAM X ABAPOSTREAM X COMMANDINFO WRITELOBREQUEST WRITELOBREPLY X PARAMETERS

AUTHENTICATION X

SESSIONCONTEXT

STATEMENTCONTEXT H H H H H H H H H

PARTITIONINFORMATION E

OUTPUTPARAMETERS G

CONNECTOPTIONS

COMMITOPTIONS

FETCHOPTIONS

FETCHSIZE

PARAMETERMETADATA F

RESULTSETMETADATA A A A

FINDLOBREQUEST

FINDLOBREPLY X

ITABSHM

ITABCHUNKMETADATA

ITABMETADATA

ITABRESULTCHUNK

CLIENTINFO

STREAMDATA X

OSTREAMRESULT X

FDAREQUESTMETADATA

FDAREPLYMETADATA

BATCHPREPARE

BATCHEXECUTE

TRANSACTIONFLAGS D D D D D D D D

A – Only in the case that the message yields one or more result sets

B – Always as a reply in case of errors while processing the statement

C – Only in the case that the statement generates a row count of affected rows

D – Always if the statement caused an action in transaction handling (commit, rollback, or

start of a new write transaction)

E – Only in the case that the server has information useful to applying statement routing (see the corresponding Usage Scenario Statement Routing)

F – Only in the case that the statement has input and/or output parameters

G – Only in the case that the statement has output parameters

H – Indicates a possible change of visible version

Type Codes

Type codes identify the type of a field transferred from or to the database. Not all type codes known and processed internally are used in the protocol, and clients may support a different level of type support depending on their version. The protocol mechanism (connect options)for connecting to the database is used to ensure that the client sends the server data it is able to process, and receives only data it can process from the server.

Type codes are in the range of 0-127, as the most significant bit is used on input to signal a NULL value of a certain type.

Value Identifier Description Support Level

0 NULL NULL value -

1 TINYINT TINYINT 1

2 SMALLINT SMALLINT 1

3 INT INTEGER 1

4 BIGINT BIGINT 1

5 DECIMAL DECIMAL, and

1

DECIMAL(p,s)

6 REAL REAL 1

7 DOUBLE DOUBLE 1

8 CHAR CHAR 1

9 VARCHAR VARCHAR 1

10 NCHAR NCHAR (Unicode character

1

type)

11 NVARCHAR NVARCHAR (Unicode

1

character type)

12 BINARY BINARY 1

13 VARBINARY VARBINARY 1

14 DATE DATE (deprecated type) 1 (deprecated with 3)

15 TIME TIME (deprecated type) 1 (deprecated with 3)

16 TIMESTAMP TIMESTAMP (millisecond

1 (deprecated with 3)

precision)

17 TIME_TZ Reserved, do not use -

18 TIME_LTZ Reserved, do not use -

19 TIMESTAMP_TZ Reserved, do not use -

20 TIMESTAMP_LTZ Reserved, do not use -

21 INTERVAL_YM Reserved, do not use -

22 INTERVAL_DS Reserved, do not use -

23 ROWID Reserved, do not use -

24 UROWID Reserved, do not use -

25 CLOB Character Large Object 1

26 NCLOB Unicode Character Large

1

Object

27 BLOB Binary Large Object 1

28 BOOLEAN Reserved, do not use -

29 STRING Character string 1

30 NSTRING Unicode character string 1

31 BLOCATOR Binary locator 1

32 NLOCATOR Unicode character locator 1

33 BSTRING Binary string 1

34 DECIMAL_DIGIT_ARRAY Reserved, do not use -

35 VARCHAR2 VARCHAR -

36 VARCHAR3 VARCHAR -

37 NVARCHAR3 NVARCHAR -

38 VARBINARY3 VARBINARY -

39 VARGROUP Reserved, do not use -

40 TINYINT_NOTNULL Reserved, do not use -

41 SMALLINT_NOTNULL Reserved, do not use -

42 INT_NOTNULL Reserved, do not use -

43 BIGINT_NOTNULL Reserved, do not use -

44 ARGUMENT Reserved, do not use -

45 TABLE Reserved, do not use -

46 CURSOR Reserved, do not use -

47 SMALLDECIMAL SMALLDECIMAL data type -

48 ABAPITAB ABAPSTREAM procedure

1

parameter

49 ABAPSTRUCT ABAP structure procedure

1

parameter

50 ARRAY Reserved, do not use -

51 TEXT TEXT data type 3

52 SHORTTEXT SHORTTEXT data type 3

53 BINTEXT BINTEXT data type 6

54 FIXEDPOINTDECIMAL Reserved, do not use -

55 ALPHANUM ALPHANUM data type 3

56 TLOCATOR Reserved, do not use -

61 LONGDATE TIMESTAMP data type 3

62 SECONDDATE TIMESTAMP type with

3

second precision

63 DAYDATE DATE data type 3

64 SECONDTIME TIME data type 3

65 CSDATE Reserved, do not use -

66 CSTIME Reserved, do not use -

71 BLOB_DISK Reserved, do not use -

72 CLOB_DISK Reserved, do not use -

73 NCLOB_DISK Reserved, do not use -

74 GEOMETRY Spatial data 5

75 POINT Spatial data 5

76 FIXED16 Reserved, do not use -

77 BLOB_HYBRID Reserved, do not use -

78 CLOB_HYBRID Reserved, do not use -

79 NCLOB_HYBRID Reserved, do not use -

80 POINTZ Spatial data 5

Part Data Format

This section describes the format of parts transmitted in messages between the client and the database server. The format of the data transmitted is uniquely identified by the part kind, some part kinds share the same format as the contained data.

Option Part Format

A common format is used to transmit options, that is, typed key-value pairs. An option part contains elements having the following structure:

+------------+------------+-------------+

| OPTIONNAME | OPTIONTYPE | OPTIONVALUE |

+------------+------------+-------------+

The fields are defined as follows:

Field Data Type Description

OPTIONNAME I1 Option key to identify the option

OPTIONTYPE I1 Type code of option value

OPTIONVALUE B[…] Option data

TOP相关主题