这是 SQL GET DIAGNOSTICS 的正确行为吗？

【问题标题】：Is this the correct behavior for SQL GET DIAGNOSTICS?这是 SQL GET DIAGNOSTICS 的正确行为吗？
【发布时间】：2019-06-27 22:30:59
【问题描述】：

SQL 语句GET DIAGNOSTICS 的documentation 表示您可以请求将诊断数据放在特定变量中，并列出相关的变量名称和类型。文章 here 和 here 展示了如何在 RPG 程序的上下文中使用此 SQL 语句。

看起来我从 DB2 得到的一些结果与文档和文章所说的不符。我使用的是 IBM i，版本 7.3。

我正在查看从 SQL 用户定义表函数 (UDTF) 返回的诊断数据。如果您使用子句“ALL”，您可以获得一个包含所有值的字符串：

COMMAND_FUNCTION=FETCH;
COMMAND_FUNCTION_CODE=+45;
DB2_NUMBER_CONNECTIONS=+1;
MORE=N;
NUMBER=+1;
CONDITION_NUMBER=+1;
DB2_MESSAGE_ID=SQL0443;
DB2_MESSAGE_ID1=CPF503E;
DB2_MODULE_DETECTING_ERROR=QSQFETCH;
DB2_ORDINAL_TOKEN_1=*N.*N;
DB2_ORDINAL_TOKEN_2=DUMMYUDTF;
DB2_ORDINAL_TOKEN_3=*******.DUMMYUDTF;
DB2_ORDINAL_TOKEN_4=Parameter '2' cannot be null.;
DB2_RETURNED_SQLCODE=-443;
DB2_TOKEN_COUNT=+4;
DB2_TOKEN_STRING=*N.*NDUMMYUDTFDUMMYUDTFParameter '2' cannot be null.;
MESSAGE_LENGTH=Parameter '2' cannot be null.;
MESSAGE_OCTET_LENGTH=Parameter '2' cannot be null.;
MESSAGE_TEXT=Parameter '2' cannot be null.;
RETURNED_SQLSTATE=90002;
ROUTINE_NAME=DUMMYUDTF;
ROUTINE_SCHEMA=QGPL;
SERVER_NAME=******;
SPECIFIC_NAME=DUMMYUDTF;
DB2_SQLERRD_SET=Y;
DB2_SQLERRD1=-168758331;
CONNECTION_NAME=******;
DB2_AUTHORIZATION_ID=********;
DB2_CONNECTION_METHOD=D;
DB2_CONNECTION_NUMBER=+1;
DB2_CONNECTION_STATE=+1;
DB2_CONNECTION_TYPE=+1;
DB2_PRODUCT_ID=QSQ07030;
DB2_SERVER_CLASS_NAME=DB2 for i;
DB2_SERVER_NAME=******;

文档指出字段MESSAGE_LENGTH 和MESSAGE_OCTET_LENGTH 应该是整数。如您所见，它们都是 VARCHAR。如果我编写将这些变量定义为整数的代码，我会在作业日志中收到转义消息：Scalar operand does not have attributes required by instruction.，以及两个诊断、严重性 50 SQL system error. 以及 SQL 服务转储 QSQSVCDMP。另一个异常情况是变量DB2_MESSAGE_ID2 看起来并没有实现，并且可以使程序在SQL 分配它的那一行崩溃。

相比之下，如果我在内置函数上使用GET DIAGNOSTICS，则数据类型都与文档中的内容相匹配，并且所有变量看起来都可用：

COMMAND_FUNCTION=SELECT;
COMMAND_FUNCTION_CODE=+65;
DB2_NUMBER_CONNECTIONS=+1;
MORE=N;
NUMBER=+1;
CLASS_ORIGIN=ISO9075;
CONDITION_NUMBER=+1;
DB2_MESSAGE_ID=SQL0138;
DB2_MESSAGE_ID1=CPF4278;
DB2_MESSAGE_ID2=CPD4317;
DB2_MODULE_DETECTING_ERROR=QSQOPEN;
DB2_ORDINAL_TOKEN_1=*N;
DB2_RETURNED_SQLCODE=-138;
DB2_TOKEN_COUNT=+1;
DB2_TOKEN_STRING=*N;
MESSAGE_LENGTH=+47;
MESSAGE_OCTET_LENGTH=+47;
MESSAGE_TEXT=Argument *N of substringing function not valid.;
RETURNED_SQLSTATE=22011;
ROUTINE_CATALOG=******;
SERVER_NAME=******;
SUBCLASS_ORIGIN=ISO9075;
DB2_SQLERRD_SET=Y;
DB2_SQLERRD1=-185403400;
DB2_SQLERRD2=-185339401;
CONNECTION_NAME=******;
DB2_AUTHORIZATION_ID=********;
DB2_CONNECTION_METHOD=D;
DB2_CONNECTION_NUMBER=+1;
DB2_CONNECTION_STATE=+1;
DB2_CONNECTION_TYPE=+1;
DB2_PRODUCT_ID=QSQ07030;
DB2_SERVER_CLASS_NAME=DB2 for i;
DB2_SERVER_NAME=******;

这是一个应该报告给 IBM 的错误吗？如何做到这一点？我制作了一个 UDTF 和一个调用 RPGLE 程序来演示这个问题。如果有人想验证我的发现，该代码如下。您可能需要注释掉 RPGLE 程序 TSTDIAUDTF 中的几行，因为您没有我的错误消息服务程序 ERRFUNC。

DUMMYUDTF 是一个外部用户定义的 SQL 函数，其代码在 SQL 和 RPGLE 中。 TSTDIAUDTF 是一个 RPGLE 程序，我用它来测试 GET DIAGNOSTICS SQL 语句的行为。

这似乎与过去报告的一些错误大致相似，例如SI44066，但细节不同。

编辑： 更正了之前拙劣的粘贴操作中的代码格式错误。

DUMMYUDTF，TXT

-- Build function by calling:
-- RUNSQLSTM SRCFILE(*******/QTXTSRC) SRCMBR(DUMMYUDTF) COMMIT(*NONE)

CREATE OR REPLACE FUNCTION DummyUDTF( 
                             parm1    NUMERIC(7,0),
                             parm2    VARCHAR(7)
                             parm3    VARCHAR(4))
   RETURNS TABLE (Out1    NUMERIC(7,0),
                  Out2    VARCHAR(13),
                  Out3    VARCHAR(4),
                  Out4    NUMERIC(7,2), 
                  Out5    NUMERIC(5,4))
   LANGUAGE RPGLE 
   DETERMINISTIC 
   READS SQL DATA   
   CALLED ON NULL INPUT 
   DISALLOW PARALLEL 
   NOT FENCED
   EXTERNAL NAME '******/DUMMYUDTF'  
   PARAMETER STYLE DB2SQL;

DUMMYUDTF、SQLRPGLE

/IF DEFINED (*CRTBNDRPG)
H DFTACTGRP(*NO) ACTGRP('DUMMYUDTF')
/ENDIF
H DEBUG
H ALWNULL(*USRCTL) OPTION(*NoDebugIO) EXTBININT(*YES)

D DUMMYUDTF       PI

*  Input Parameters
D parm1                          7S 0
D parm2                          7A   VARYING
D parm3                          4A   VARYING

* Columns to be returned
D out1                           7S 0
D out2                          13A   VARYING
D out3                           4A   VARYING
D out4                           7S 2
D out5                           5S 4

* NULL Indicators for all input and output parameters
D parm1_n                        5I 0
D parm2_n                        5I 0
D parm3_n                        5I 0

D out1_n                         5I 0
D out2_n                         5I 0
D out3_n                         5I 0
D out4_n                         5I 0
D out5_n                         5I 0

* SQL Function Parameters

D OutputSQLState                 5A
D FunctionName                 517A   VARYING CONST
D SpecificName                 128A   VARYING CONST
D MessageText                 1000A   VARYING
D CallType                      10I 0


* Locals

D CallTypeFirst   C                   CONST(-2)
D CallTypeOpen    C                   CONST(-1)
D CallTypeFetch   C                   CONST(0)
D CallTypeClose   C                   CONST(1)
D CallTypeFinal   C                   CONST(2)

D out             DS                  TEMPLATE QUALIFIED
D  out1                          7S 0
D  out2                         13A   VARYING
D  out3                          4A   VARYING
D  out4                          7S 2
D  out5                          5S 4

D results         DS                  DIM(99) LIKEDS(out)
D index           S              2S 0
D count           S              2S 0

D var4            S              7S 2
D var5            S              5S 4

MONITOR;

OutputSQLState = *ZEROS;       // Initialize Output Parameters
CLEAR MessageText;

SELECT;
WHEN CallType = CallTypeOpen;
IF parm1_n = -1;
MessageText = BuildNullError('1');
RETURN;
ENDIF;
IF parm2_n = -1;
MessageText = BuildNullError('2');
RETURN;
ENDIF;
IF parm3_n = -1;
MessageText = BuildNullError('3');
RETURN;
ENDIF;
IF parm1 < 1;
OutputSQLState = '90002';
MessageText = 'Parameter 1 must be a number greater than 0.';
RETURN;
ENDIF;
EXSR BuildDummyData;

WHEN CallType = CallTypeFetch;
index += 1;
IF index > count;
OutputSQLState = '02000';
RETURN;
ENDIF;

out1 = results(index).out1;
out2 = results(index).out2;
out3 = results(index).out3;
out4 = results(index).out4;
out5 = results(index).out5;
WHEN CallType = CallTypeClose;
*INLR = *ON;
ENDSL;
ON-ERROR;
DUMP;  // This dump ends up in the output queue QUSRSYS\QEZDEBUG
OutputSQLState = '90001';
MessageText = 'Error occurred in RPG program ''DUMMYUDTF''. ' +
'See program dump for additional details.';
ENDMON;
RETURN;

********************************************************************
BEGSR BuildDummyData;

EXEC SQL SELECT 350.05, .65
INTO :var4, :var5
FROM SYSIBM.SYSDUMMY1;

SaveToResults(parm1 : parm2 : parm3 : var4 : var5);
SaveToResults(219 : 'ABCDEF'     : 'ZYXW' : 20.1 : .65);
SaveToResults(438 : 'GHIJKLMNOP' : 'ZYXW' : 2.95 : 0);
ENDSR;

********************************************************************

P BuildNullError...
P                 B
D                 PI          1000A   VARYING
D  parmName                     20A   VALUE VARYING

OutputSQLState = '90002';
RETURN 'Parameter ''' + parmName + ''' cannot be null.';
P                 E

********************************************************************

P SaveToResults...
P                 B
D                 PI
D  loc1                          7S 0 VALUE
D  loc2                         13A   VALUE VARYING
D  loc3                          4A   VALUE VARYING
D  loc4                          7S 2 VALUE
D  loc5                          5S 4 VALUE

IF count = 99;
OutputSQLState = '10Z01';
MessageText = 'SQL warning in DUMMYUDTF +
More than 99 parts generated.';
ELSE;
count += 1;
results(count).out1 = loc1;
results(count).out2 = loc2;
results(count).out3 = loc3;
results(count).out4 = loc4;
results(count).out5 = loc5;
ENDIF;
P                 E

TSTDIAUDTF、SQLRPGLE

H DEBUG(*YES)
H MAIN(Main)
H DFTACTGRP(*NO)
H BNDDIR('ERRFUNC')

/copy QRPGLESRC,ERRFUNCPR
D  Message        DS                  LIKEDS(ErrorMsg)

D success         S              3I 0
D failure         S              3I 0
D diagAll         S          32740A   VARYING
D displayText     S             52A

D dummyItem       DS                  INZ
D  out1                          7S 0
D  out2                         13A
D  out3                          4A
D  out4                          7S 2
D  out5                          5S 4

D SQLDiagData     DS                  INZ
D  MessageID                    10A
D  MessageID1                    7A
D  MessageID2                    7A
D  MessageLength                 5I 0
D  MessageText               32740A   VARYING
D  otherType                 32740A   VARYING
D  ReturnedSQLCode...
D                                5A
D  ReturnedSQLState...
D                                5A
D  RowCount                     10I 0

P Main            B

DSPLY 'Beginning of test';
TestDummyUDTF();
TestDiagnoticsFromUDTF();
TestDiagnoticsFromBIF();

DSPLY ('Successful tests: ' + %char(success));
DSPLY ('Failed tests:     ' + %char(failure));
RETURN;

BEGSR *PSSR;
DUMP;
DSPLY 'Unexpected error while running tests.';
GetErrorMsg(Message);
DSPLY ('Message.MsgId: ' + Message.MsgId);
DSPLY (%subst(Message.MsgText:1:52));
RETURN;
ENDSR;
P                 E

********************************************************************

P TestDiagnoticsFromBIF...
P                 B

D text            S             10A
DSPLY 'Causing error from SUBSTR to read diagnostics.';
EXEC SQL SELECT SUBSTR('ABC', 1, -1) INTO :text
FROM SYSIBM.SYSDUMMY1;
IF SQLSTATE = '00000';
failure +=1;
DSPLY 'Test failed. Data returned, no error.';
ELSEIF SQLSTATE = '02000';
failure +=1;
DSPLY 'Test failed. No error returned.';
ELSE;
ReadSQLDiagnosticsAll();
IF diagAll <> '';
success += 1;
DisplayTextWindow(diagAll : 'CPF9898':'QCPFMSG');
DSPLY 'GET DIAGNOSTICS ALL succeeded.';
ELSE;
failure +=1;
DSPLY 'GET DIAGNOSTICS ALL failed.';
ENDIF;

ReadSQLDiagnosticsAllCondition();
IF diagAll <> '';
success += 1;
DisplayTextWindow(diagAll : 'CPF9898':'QCPFMSG');
DSPLY 'GET DIAGNOSTICS ALL CONDITION succeeded.';
ELSE;
failure +=1;
DSPLY 'GET DIAGNOSTICS ALL CONDITION failed.';
ENDIF;

ReadSQLDiagnostics();
IF ReturnedSQLCode <> '-138 ' OR
ReturnedSQLState <> '22011';
failure +=1;
DSPLY 'Test failed. Unexpected diagnostic.';
displayText = 'SQLCODE  ' + ReturnedSQLCode +
'   SQLSTATE ' + ReturnedSQLState;
DSPLY displayText;
ELSE;
displayText = MessageText;
DSPLY displayText;
displayText = 'MESSAGE_LENGTH ' + %char(MessageLength);
DSPLY displayText;
displayText = 'DB2_MESSAGE_ID  ' + MessageID +
' DB2_MESSAGE_ID1 ' + MessageID1;
DSPLY displayText;
displayText = 'DB2_MESSAGE_ID2 ' + MessageID2;
DSPLY displayText;
IF MessageText <> '';
success += 1;
DSPLY 'GET DIAGNOSTICS MessageText succeeded.';
ELSE;
failure +=1;
DSPLY 'GET DIAGNOSTICS MessageText failed.';
ENDIF;
ENDIF;
ENDIF;
P                 E

********************************************************************

P TestDiagnoticsFromUDTF...
P                 B

D var2            S              7A
D var2_n          S              5I 0

var2_n = -1;
DSPLY 'Causing error from DummyUDTF to read diagnostics.';
EXEC SQL DECLARE CUR_DIAG_UDTF CURSOR FOR (
SELECT ITEMS.*
FROM TABLE (QGPL.DummyUDTF(22, :var2 :var2_n, 'ZZ')) AS ITEMS
);
EXEC SQL OPEN CUR_DIAG_UDTF;
DOW 1=1;
EXEC SQL FETCH CUR_DIAG_UDTF INTO :dummyItem;
IF SQLSTATE = '00000';
failure +=1;
DSPLY 'Test failed. Records returned, no error.';
LEAVE;
ELSEIF SQLSTATE = '02000';
failure +=1;
DSPLY 'Test failed. No error returned.';
LEAVE;
ELSE;
ReadSQLDiagnosticsAll();
IF diagAll <> '';
success += 1;
DisplayTextWindow(diagAll : 'CPF9898':'QCPFMSG');
DSPLY 'GET DIAGNOSTICS ALL succeeded.';
ELSE;
failure +=1;
DSPLY 'GET DIAGNOSTICS ALL failed.';
ENDIF;

ReadSQLDiagnosticsAllCondition();
IF diagAll <> '';
success += 1;
DisplayTextWindow(diagAll : 'CPF9898':'QCPFMSG');
DSPLY 'GET DIAGNOSTICS ALL CONDITION succeeded.';
ELSE;
failure +=1;
DSPLY 'GET DIAGNOSTICS ALL CONDITION failed.';
ENDIF;

ReadSQLDiagnosticsUDTF();
IF ReturnedSQLCode <> '-443 ' OR
ReturnedSQLState <> '90002';
failure +=1;
DSPLY 'Test failed. Unexpected diagnostic.';
displayText = 'SQLCODE  ' + ReturnedSQLCode +
'   SQLSTATE ' + ReturnedSQLState;
DSPLY displayText;
ELSE;
*        DSPLY MessageID;
*        DSPLY %char(MessageLength);
displayText = MessageText;
DSPLY displayText;
displayText = 'MESSAGE_LENGTH ' + OtherType;
DSPLY displayText;
displayText = 'DB2_MESSAGE_ID  ' + MessageID +
' DB2_MESSAGE_ID1 ' + MessageID1;
DSPLY displayText;
IF MessageText <> '';
success += 1;
DSPLY 'GET DIAGNOSTICS MessageText succeeded.';
ELSE;
failure +=1;
DSPLY 'GET DIAGNOSTICS MessageText failed.';
ENDIF;
ENDIF;
LEAVE;
ENDIF;
ENDDO;
EXEC SQL CLOSE CUR_DIAG_UDTF;
P                 E
********************************************************************

P TestDummyUDTF...
P                 B

D expected        DS                  DIM(3) LIKEDS(dummyItem)
D index           S              3I 0

expected(1).out1 = 22;
expected(1).out2 = 'AAAA';
expected(1).out3 = 'ZZ';
expected(1).out4 = 350.05;
expected(1).out5 = .65;
expected(2).out1 = 219;
expected(2).out2 = 'ABCDEF';
expected(2).out3 = 'ZYXW';
expected(2).out4 = 20.1;
expected(2).out5 = .65;
expected(3).out1 = 438;
expected(3).out2 = 'GHIJKLMNOP';
expected(3).out3 = 'ZYXW';
expected(3).out4 = 2.95;
expected(3).out5 = 0;

DSPLY 'Running test on DummyUDTF, success expected.';
EXEC SQL DECLARE CUR_UDTF CURSOR FOR (
SELECT ITEMS.*
FROM TABLE (QGPL.DummyUDTF(22, 'AAAA', 'ZZ')) AS ITEMS
);
EXEC SQL OPEN CUR_UDTF;
DOW 1=1;
EXEC SQL FETCH CUR_UDTF INTO :dummyItem;
IF SQLSTATE = '00000';
index += 1;
IF out1 <> expected(index).out1 OR
out2 <> expected(index).out2 OR
out3 <> expected(index).out3 OR
out4 <> expected(index).out4 OR
out5 <> expected(index).out5;
failure +=1;
DSPLY 'Test failed. Data mismatch from UDTF.';
ELSE;
success += 1;
DSPLY 'Test succeeded.';
ENDIF;
LEAVE;
ELSEIF SQLSTATE = '02000';
IF index = 0;
failure +=1;
DSPLY 'Test failed. No records returned.';
ENDIF;
LEAVE;
ELSE;
failure +=1;
DSPLY ('Test failed. SQLSTATE ' + SQLSTATE);
// ReadSQLDiagnostics();
LEAVE;
ENDIF;
ENDDO;
EXEC SQL CLOSE CUR_UDTF;
RETURN;
P                 E

**************************************************************************

P ReadSQLDiagnostics...
P                 B
D                 PI
D  condition#                    5I 0 VALUE OPTIONS(*NOPASS)

IF %parms = 0 OR condition# < 1;
condition# = 1;
ENDIF;
EXEC SQL GET DIAGNOSTICS CONDITION :condition#
:SQLDiagData.ReturnedSQLCode  = DB2_RETURNED_SQLCODE,
:SQLDiagData.ReturnedSQLState = RETURNED_SQLSTATE,
:SQLDiagData.MessageText      = MESSAGE_TEXT,
:SQLDiagData.MessageLength    = MESSAGE_LENGTH,
:SQLDiagData.MessageID        = DB2_MESSAGE_ID,
:SQLDiagData.MessageID1       = DB2_MESSAGE_ID1,
:SQLDiagData.MessageID2       = DB2_MESSAGE_ID2;
RETURN;
P                 E

**************************************************************************

P ReadSQLDiagnosticsUDTF...
P                 B
D                 PI
D  condition#                    5I 0 VALUE OPTIONS(*NOPASS)

IF %parms = 0 OR condition# < 1;
condition# = 1;
ENDIF;
EXEC SQL GET DIAGNOSTICS CONDITION :condition#
:SQLDiagData.ReturnedSQLCode  = DB2_RETURNED_SQLCODE,
:SQLDiagData.ReturnedSQLState = RETURNED_SQLSTATE,
:SQLDiagData.MessageText      = MESSAGE_TEXT,
:SQLDiagData.otherType        = MESSAGE_LENGTH,
:SQLDiagData.MessageID        = DB2_MESSAGE_ID,
:SQLDiagData.MessageID1       = DB2_MESSAGE_ID1;

//   :SQLDiagData.MessageLength    = MESSAGE_LENGTH,
//   :SQLDiagData.MessageID        = DB2_MESSAGE_ID;

RETURN;
P                 E

************************4*************************************************

P ReadSQLDiagnosticsAll...
P                 B

EXEC SQL GET DIAGNOSTICS :diagAll = ALL;
RETURN;
P                 E
**************************************************************************

P ReadSQLDiagnosticsAllCondition...
P                 B
D                 PI
D  condition#                    5I 0 VALUE OPTIONS(*NOPASS)

IF %parms = 0 OR condition# < 1;
condition# = 1;
ENDIF;
EXEC SQL GET DIAGNOSTICS :diagAll = ALL CONDITION;
RETURN;
P                 E

P DisplayTextWindow...
P                 B                   Export
D                 PI
D Text                        8192    Const Varying
D MessageId                      7    Const
D MessageFile                   21    Const

D ErrCode         DS
D  BytesIn                      10I 0 INZ(0)
D  BytesOut                     10I 0 INZ(0)

DQUILNGTX         PR                  EXTPGM('QUILNGTX')
D MsgText                     8192    CONST
D MsgLength                     10I 0 CONST
D MessageId                      7    CONST
D MessageFile                   21    CONST
D dsErrCode                           LIKE(ErrCode)

QUILNGTX(Text : %Len(Text) :
MessageId : MessageFile : ErrCode);
P                 E

【问题讨论】：

    标签： db2 ibm-midrange db2-400 rpgle


    【解决方案1】：

    是的，它看起来可能是一个错误...或者考虑到您链接到的 PTF...在使用外部 UDTF 时，这可能是 GET DIAGNOSTICS 的限制。

    我在 7.2 上看到了同样的情况。

    您的 PTF 级别是多少？如果不是最新的，IBM 会要求您获得最新的。

    您可以在这里报告问题：https://www-946.ibm.com/support/servicerequest/Home.action

    IBM 可能会要求重现代码。您可能希望将您的示例减少到最低限度以进行重现。实际上，在下次发布到 stackoverflow 之前这样做是个好主意。

    例如，调用 UDTF 以查看问题所需的全部内容如下：

    **free
ctl-opt actgrp(*NEW) main(mainline) cvtopt(*NOVARCHAR) debug(*yes);
dcl-pr mainline extpgm('TESTRPGLE');
end-pr;


dcl-proc mainline;

  dcl-s diagAll varchar(32740);
  dcl-ds dummyItem qualified;
    out1 zoned(7);
    out2 varchar(13);
    out3 varchar(4);
    out4 zoned(7:2);
    out5 zoned(5:4);
  end-ds;
  dcl-s nullArr int(5) dim(5);

  exec sql
    declare C1 cursor for (
    SELECT ITEMS.*
     FROM TABLE (DummyUDTF(22, cast(null as varchar(7)), 'ZZ')) AS ITEMS
     );

  exec sql
    open C1;

  //I expected  SQLSTATE to be 90002 here, but it's not
  if sqlstate <> *ZEROS;
    exec sql
      get diagnostics :diagAll = ALL;
    dump;
    return;
  endif;

  exec sql
    fetch C1 into :dummyItem :nullArr;

  //here's where the SQLSTATE of 90002 is returned.
  if sqlstate <> *ZEROS;
    exec sql
      get diagnostics :diagAll = ALL;
    dump;
    return;
  endif;
  return;
end-proc;

    旁注：开始使用完全免费的格式；）

    【讨论】：

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