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Two functionalities that work perfectly together.

 

One of my favorite programming techniques is linking together functionality to make even-more-powerful functionality. An example of this is wrapping an SQL user-defined table function (UDTF) around a System i list API to retrieve a given list through an SQL interface. As an example, let's explore a service program that can be used for exactly that purpose.

SQLLSTAPI

The SQLLSTAPI service program contains two subprocedures. The getMessages subprocedure utilizes the retrieve message API (QMHRTVM) to retrieve a list of message file messages. The getSpooledFileList subprocedure retrieves a list of spooled files through the QUSLSPL API. The full source for the code associated with this tip can be found here.

 

getMessages

This subprocedure retrieves individual messages from the message file identified by the subprocedure's two parameters (inLibrary and inMsgf). Below is the source for this subprocedure.

      //*********************************************************************

      //  Procedure: getMessages

      //  Function:  Retrieve message descriptions for all messages in a

      //             given message file. Data is returned as an SQL table

      //             function.

      //*********************************************************************

     d getMessages     pr

      * Input Parameters

     d   inLibrary                   10a   Const varying

     d   inMsgF                      10a   Const varying

      * Output Parameters

     d   outMsgId                     7a

     d   outMsgSev                    2  0

     d   outMsgDesc                 500a   varying

     d   outMsgHelp                 500a   varying

      * NULL Indicators

     d   niLibr                       5i 0

     d   niMsgf                       5i 0

     d   niMsgId                      5i 0

     d   niMsgSev                     5i 0

     d   niMsgDesc                    5i 0

     d   niMsgHelp                    5i 0

      * SQL Info

     d   SQLState                     5

     d   FunctName                  517a   varying

     d   SpecName                   128a   varying

     d   SQLMsg                      70a   varying

     d   CallType                    10I 0

      //*********************************************************************

      //  Procedure: getSpooledFileList

      //  Function:  Retrieve a list of spooled files based on supplied

      //             criteria. Data is returned as an SQL table function.

      //*********************************************************************

     d getSpooledFileList...

     d                 pr

      * Input Parameters

     D  inpUserId                    10a   varying

     D  inpOutQueue                  20a   varying

     D  inpFormType                  10a   varying

     D  inpUserData                  10a   varying

      * Output Parameters

     d  outSplfNam                   10a

     d  outSplfnum                   10i 0

     d  outSplfSts                   10a

     d  outFrmTyp                    10a

     d  outOutq                      10a

     d  outPages                     10i 0

     d  outCopies                    10i 0

     d  outJobNam                    10a

     d  outUserNam                   10a

     d  outJob#                       6a

      * NULL Indicators

     d   niUserId                     5i 0

     d   niOutQueue                   5i 0

     d   niFormType                   5i 0

     d   niUserData                   5i 0

     d   niSplfNam                    5i 0

     d   niSplfnum                    5i 0

     d   niSplfSts                    5i 0

     d   niFrmTyp                     5i 0

     d   niOutq                       5i 0

     d   niPages                      5i 0

     d   niCopies                     5i 0

     d   niJobNam                     5i 0

     d   niUserNam                    5i 0

     d   niJob#                       5i 0

      * SQL Info

     d   SQLState                     5

     d   FunctName                  517a   varying

     d   SpecName                   128a   varying

     d   SQLMsg                      70a   varying

     d   CallType                    10I 0

      //*********************************************************************

      //  Procedure: getMessages

      //  Function:  Retrieve message descriptions for all messages in a

      //             given message file. Data is returned as an SQL table

      //             function.

      //*********************************************************************

     p getMessages     b                   EXPORT

     d getMessages     pi

      * Input Parameters

     d   inLibrary                   10a   Const varying

     d   inMsgF                      10a   Const varying

      * Output Parameters

     d   outMsgId                     7a

     d   outMsgSev                    2  0

     d   outMsgDesc                 500a   varying

     d   outMsgHelp                 500a   varying

      * NULL Indicators

     d   niLibr                       5i 0

     d   niMsgf                       5i 0

     d   niMsgId                      5i 0

     d   niMsgSev                     5i 0

     d   niMsgDesc                    5i 0

     d   niMsgHelp                    5i 0

      * SQL Info

     d   SQLState                     5

     d   FunctName                  517a   varying

     d   SpecName                   128a   varying

     d   SQLMsg                      70a   varying

     d   CallType                    10I 0

     dRetrieveMsg      pr                  ExtPgm('QMHRTVM')

     d MsgInfo                    32767a   Options(*varsize)

     d RtnLength                     10i 0 Const

     d RtnFormat                      8a   Const

     d MsgID                          7a   Const

     d QualMsgF                      20a   Const

     d RplData                    32767a   Options(*varsize) Const

     d RplDataLen                    10i 0 Const

     d RplSubValue                   10a   Const

     d RtnCtlChar                    10a   Const

     d ErrorCode                    500a

     d RtvOption                     10a   Const

     d CCSIDCnvTo                    10i 0 Const Options(*Omit)

     d CCSIDRplDta                   10i 0 Const Options(*Omit)

     dRTVM0300         ds                  Qualified

     d BytesReturned                 10i 0

     d BytesAvailable                10i 0

     d MsgSev                        10i 0

     d AlertIndex                    10i 0

     d AlertOption                    9a

     d LogPrb                         1a

     d MsgID                          7a

     d                                3a

     d NbrSubValueFormat...

     d                               10i 0

     d CCSIDConvStsText...

     d                               10i 0

     d CCSIDConvRplDta...

     d                               10i 0

     d CCSIDRtnText                  10i 0

     d OffsetDftRpy                  10i 0

     d DftRpyRtnLen                  10i 0

     d DftRpyAvlLen                  10i 0

     d OffsetMsg                     10i 0

     d MsgLenRtn                     10i 0

     d MsgLenAvl                     10i 0

     d OffsetMsgHlp                  10i 0

     d MsgHlpRtnLen                  10i 0

     d MsgHlpAvlLen                  10i 0

     d OffsetSubVar...

     d                               10i 0

     d SubVarRtnLen...

     d                               10i 0

     d SubVarAvlLen...

     d                               10i 0

     d SubVarElement...

     d                               10i 0

     d                              500a   Varying

     d DftRpy                       500a   Varying

     d Msg                          500a   Varying

     d MsgHlp                       500a   Varying

     d SubVar                       500a   Varying

     d SQL_OK          c                   '00000'

     d SQL_EOF         c                   '02000'

     d SQL_FILE_NOT_FOUND...

     d                 c                   '00204'

     d ErrorDS         ds                  Qualified

     d BytesReturned                 10i 0 Inz(%Size(ErrorDS))

     d BytesAvailable                10i 0

     d MsgID                          7a

     d                                1a

     d MsgText                      512a

     d MsgID           s              7a

     d LogPrb          s              4a

     d msgRtv          s             10a   STATIC

     d lastMsg         s              7a   STATIC

      /free

          SQLState = SQL_OK;

          if calltype = -1;

            if niLibr = 1 OR niMsgf = 1;

              SQLState=SQL_FILE_NOT_FOUND;

              msgRtv = '';

              *INLR = *ON;

              Return;

            ENDIF;

            lastMsg = '';

            msgRtv = '*FIRST';

          else;

            msgRtv = '*NEXT';

          ENDIF;

          RetrieveMsg( RTVM0300

                     : %Len(RTVM0300)

                     : 'RTVM0300'

                     : LastMsg

                     : inMsgF  + inLibrary

                     : ' '

                     : 1

                     : '*NO'

                     : '*NO'

                     : ErrorDS

                     : msgRtv

                     : 0

                     : 0 );

          If ErrorDS.BytesAvailable <> 0;

              exsr setEOF;

          Else;

            If RTVM0300.MsgID <> '';

              outMsgId = RTVM0300.MsgId;

              outMsgSev = RTVM0300.MsgSev;

              outMsgDesc = %subst( RTVM0300

                                 : RTVM0300.OffsetMsg+1

                                 : RTVM0300.MsgLenRtn);

              outMsgHelp = %subst( RTVM0300

                                 : RTVM0300.OffsetMsgHlp+1

                                 : RTVM0300.MsgHlpRtnLen);

              lastMsg = outMsgId;

            else;

              exsr setEOF;

            EndIf;

          EndIf;

          Return;

          Begsr setEOF;

            outMsgId = '';

            outMsgSev = 0;

            outMsgDesc = '';

            outMsgHelp = '';

            SQLState = SQL_EOF;

            msgRtv = '';

            *InLR = *On;

            niMsgID = 1;

            niMsgID = 1;

            niMsgID = 1;

            niMsgID = 1;

            lastMsg = '';

          ENDSR;

      /end-free

     p getMessages     e

 

This subprocedure is designed to return a different "record" each time that the routine is called with different parameters. This is how the SQL table function that will later be associated with the subprocedure is able to retrieve an entire record set from the routine. The output parameters sent back by the subprocedure will include the message ID, the message severity value, the message text description, and the message help text. Just a side note: the value returned into the text description and the help text will include any replacement variables in the original form (&1, &2). For purposes of the SQL function, the subprocedure also includes a set of null indicators—one for each of the previously defined parameters, both input and output. A set of SQL information values is also sent back to the caller to indicate the status of the call along with any message information. Each time this subprocedure is called, it will continue to return records until there is no more data available. At that point, it will return an SQL State value of SQL_EOF, which will indicate an end-of-file condition to the calling SQL interface. Note that when the message file identified on the subprocedure's input parameters cannot be found, the routine will return an SQL_FILE_NOT_FOUND condition as the SQL State value.

 

getSpooledFileList

This subprocedure retrieves information about spooled files based on a supplied set of four parameters. These include the user ID for the user who generated the spooled file, the output queue that contains the spooled file, the form type of the spooled file and the user data specified on the spooled file. The source for this subprocedure is shown below.

      //*********************************************************************

      //  Procedure: getSpooledFileList

      //  Function:  Retrieve spooled file list entries based on specified

      //             input parameters. Data is returned as an SQL table

      //             function.

      //*********************************************************************

     p getSpooledFileList...

     p                 b                   export

     d getSpooledFileList...

     d                 pi

      * Input Parameters

     D  inpUserId                    10a   varying

     D  inpOutQueue                  20a   varying

     D  inpFormType                  10a   varying

     D  inpUserData                  10a   varying

      * Output Parameters

     d  outSplfNam                   10a

     d  outSplfnum                   10i 0

     d  outSplfSts                   10a

     d  outFrmTyp                    10a

     d  outOutq                      10a

     d  outPages                     10i 0

     d  outCopies                    10i 0

     d  outJobNam                    10a

     d  outUserNam                   10a

     d  outJob#                       6a

      * NULL Indicators

     d   niUserId                     5i 0

     d   niOutQueue                   5i 0

     d   niFormType                   5i 0

     d   niUserData                   5i 0

     d   niSplfNam                    5i 0

     d   niSplfnum                    5i 0

     d   niSplfSts                    5i 0

     d   niFrmTyp                     5i 0

     d   niOutq                       5i 0

     d   niPages                      5i 0

     d   niCopies                     5i 0

     d   niJobNam                     5i 0

     d   niUserNam                    5i 0

     d   niJob#                       5i 0

      * SQL Info

     d   SQLState                     5

     d   FunctName                  517a   varying

     d   SpecName                   128a   varying

     d   SQLMsg                      70a   varying

     d   CallType                    10I 0

      //***************************************************************

      // Miscellaneous Variables

      //***************************************************************

     D RRn1            S              5  0

     D Spl#            S              6a

      //***************************************

      // Input format for API QUSLSPL

      //**************************************

     D outFormat       S              8a

     D usrSpace        S             20a   static

     D listID          S             10i 0 static inz(0)

     D ofStart         S             10i 0  static

     D ofLen           S             10i 0  static

      /FREE

         if calltype = -1;

           *INLR = *OFF;

           usrSpace= 'SPLFLIST  QTEMP     ';

           descTxt = 'SPLF List User Space';

           extAttr = ' ';

           inzSize = 5000;

           intlVal  = ' ';

           pubAuth = '*CHANGE';

           outFormat = 'SPLF0300';

           deleteUserSpace( usrSpace

                          : errorDS);

           createUserSpace( usrSpace

                         : extAttr

                         : inzSize

                         : intlVal

                         : pubAuth

                         : descTxt

                         : rplc

                         : errorDS);

           if ErrorDS.BytesAvailable = 0;

             User = inpUserID;

             OutQ = inpOutQueue;

             FormType = inpFormType;

             UserData = inpUserData;

             retrieveSpooledFileList( usrSpace

                                    : outFormat

                                    : User

                                    : OutQ

                                    : FormType

                                    : UserData

                                    : errorDS

                                     );

             ofStart = 1;

             ofLen = 140;

              retrieveUserSpaceHeader( usrSpace

                                     : ofStart

                                     : ofLen

                                     : headerDS

                                     : errorDS);

             if ErrorDS.BytesAvailable <> 0;

               exsr setEOF;

               return;

             endif;

             ofStart = headerDS.ListOffset + 1;

           else;

              exsr setEOF;

              return;

           endif;

         endif;

        if niUserId   = 1 OR

           niOutQueue = 1 OR

           niFormType = 1 OR

           niUserData = 1;

           SQLState=SQL_FILE_NOT_FOUND;

           usrSpace = '';

           *INLR = *ON;

           Return;

         ENDIF;

         if calltype <= 0;

                if listId < headerDS.ListNumber;

                  listid += 1;

                  clear Splf0300;

                  retrieveUserSpaceSpl0300( usrSpace

                                         : ofStart

                                         : ofLen

                                         : Splf0300

                                         : errorDS);

                 if ErrorDS.BytesAvailable = 0 and SSplfName <> '';

                    Select;

                    When SSplfStat = 1;

                      outSplfsts = 'READY';

                    When SSplfStat = 2;

                      outSplfsts = 'OPENED';

                    When SSplfStat = 3;

                      outSplfsts = 'CLOSED';

                    When SSplfStat = 4;

                      outSplfsts = 'SAVED';

                    When SSplfStat = 5;

                      outSplfsts = 'WRITING';

                    When SSplfStat = 6;

                      outSplfsts = 'ON HOLD';

                    When SSplfStat = 7 or SSplfStat = 8;

                      outSplfsts = 'PENDING';

                    When SSplfStat = 10;

                      outSplfsts = 'FINISHED';

                    When SSplfStat = 11;

                      outSplfsts = 'SENDING';

                    When SSplfStat = 12;

                      outSplfsts = 'DEFERRED';

                    Endsl;

                    outSplfNam = SSplfName;

                    outSplfnum = SSplfNum;

                    outFrmTyp = SFormType;

                    outOutq = Soutq;

                    outPages = SPages;

                    outCopies = SCopies;

                    outJobNam =  SJObName;

                    outUserNam = SUserName;

                    outJob#    = SJob#;

                    SQLState = SQL_OK;

                  else;

                    exsr setEOF;

                    Return;

                  endif;

                  ofStart = ofStart + headerDS.EntrySize;

             else;

               exsr setEOF;

               Return;

             Endif;

           Endif;

           Return;

           Begsr setEOF;

             outSplfNam = '';

             outSplfnum = 0;

             outFrmTyp  = '';

             outOutq =  '';

             outPages = 0;

             outCopies  = 0;

             outJobNam  = '';

             outUserNam = '';

             outJob#    = '';

             SQLMsg  = '';

             SQLState = SQL_EOF;

             listId = 0;

             *InLR = *On;

             niSplfNam = 1;

             niSplfnum = 1;

             niFrmTyp = 1;

             niOutq = 1;

             niPages = 1;

             niCopies = 1;

             niJobNam = 1;

             niUserNam = 1;

             niJob# = 1;

          ENDSR;

      /END-FREE

     p getSpooledFileList...

     p                 e

 

Note that all of the special values supported by the WRKSPLF command for these parameters are also supported here. The output parameters from this subprocedure include the spooled file name, the spooled file number, the status of the spooled file at the time the subprocedure is called, the form type, the output queue, the number of pages in the spooled file, the number of copies specified on the spooled file, along with the job name, user name, and job number that created the file. As with the getMessages subprocedure, this subprocedure also returns a set of null indicators and SQL status information to be passed back to the caller.

Creating the Functions

Now that we have examined the subprocedures that will act as our SQL functions, we need to execute the commands to create those functions. First, we need to compile to service program that contains these two subprocedures. To do this, execute the two commands below to create the module and service program;

 

CRTRPGMOD MODULE(mylib/SQLLSTAPI) SRCFILE(mylib/QRPGLESRC) 

    SRCMBR(SQLLSTAPI) REPLACE(*NO)               

CRTSRVPGM SRVPGM(mylib/SQLLSTAPI) MODULE(mylib/SQLLSTAPI)  

          EXPORT(*ALL)             

 

Now that we have our compiled service program, we need to associate that service program—or more appropriately, the subprocedures contained in that service program—with an SQL user-defined table function (UDTF). To do this, we need to execute an SQL statement. The easiest way to do this is to enter the statements into a source file member for each UDTF that we're creating. Below is the text of the statements to create the getMessages UDTF.

 

CREATE FUNCTION mylib/GETMESSAGES(Library VARCHAR (10),           

                                  MessageFile VARCHAR (10))       

RETURNS TABLE ( MsgID CHAR (7 ),                                  

                MsgSev DECIMAL (2 , 0),                            

                MsgDesc VARCHAR (500 ),                           

                MsgHelp VARCHAR (500 ))                           

LANGUAGE RPGLE                                                    

EXTERNAL NAME 'mylib/SQLLSTAPI(GETMESSAGES)'                      

PARAMETER STYLE DB2SQL                                            

DISALLOW PARALLEL                                                 

NO SQL                                                            

NO FINAL CALL                                                      

 

Note that the function accepts the same two input parameters identified in our getMessages subprocedure and returns the four values that we identified as output parameters from that subprocedure. The external name value is specified in the following format:

 

library/service program(sub-procedure)

 

The value "PARAMETER STYLE DB2SQSL" identifies that the program will return and expect the null indicator and SQL info variables. Once you have the source for each of the subprocedures saved into a source member, execute the following commands to run the statements to create the UDTF.

 

RUNSQLSTM SRCFILE(mylib/QSQLSRC) SRCMBR(GETMSGF)      

RUNSQLSTM SRCFILE(mylib/QSQLSRC) SRCMBR(GETSPLF)          

 

Note that these commands assume that you have each of the subprocedures saved into a source file QSQLSRC in the library mylib. The advantage to saving these statements in a source member versus simply executing them from an interactive SQL prompt or from the SQL utility within Operations Navigator is that it makes it easier to recreate the function in the future or on multiple systems. Once you've completed both of these commands, the UDTFs are available for use.

Calling the UDTFs

Now that we've created our UDTFs, we can execute them from anywhere that an SQL command is accepted. This includes the interactive SQL tool (STRSQL) as well as embedded SQL (SQLRPGLE type) programs. This also means that remote applications that access the System i through OLE DB or ODBC connections can call these functions. Below is a sample of calling the getMessages UDTF from interactive SQL.

 

SELECT * FROM TABLE(mylib/getMessages('QSYS      ', 'QCEEMSG   ')) Msgs

 

Note that the Msgs value at the end of the line is an alias that is required when calling a UDTF. The "TABLE" prefix is used to identify that we are calling a user-defined table function. Figure 1 shows a sample of the output generated by this call.

 

090911FaustFig1

Figure 1: These are the results generated by the getMessages UDTF.

 

Similarly the getSpooledFileList function can be called as shown below;

 

SELECT * FROM

 TABLE(mylib/getSpooledFileList('*CURRENT  ', '*ALL ','*ALL ', '*ALL ')) Splf

 

Note that in this example the parameters are all passed as special values. In each of the examples given, we may choose to filter results using a WHERE clause. Figure 2 shows an example of the output from this statement.

 

090911FaustFig2

Figure 2: These are the results from the getSpooledFileList UDTF.

What's Your Function?

Now that we've explored combining functionality like user-defined table functions and system APIs, I hope you'll think of other ways to make use of this concept in your shop.

as/400, os/400, iseries, system i, i5/os, ibm i, power systems, 6.1, 7.1, V7, V6R1

Mike Faust

Mike Faust is a senior consultant/analyst for Retail Technologies Corporation in Orlando, Florida. Mike is also the author of the books Active Server Pages Primer, The iSeries and AS/400 Programmer's Guide to Cool Things, JavaScript for the Business Developer, and SQL Built-in Functions and Stored Procedures. You can contact Mike at This email address is being protected from spambots. You need JavaScript enabled to view it..


MC Press books written by Mike Faust available now on the MC Press Bookstore.

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  • FORTRAManaging messages on your IBM i can be more than a full-time job if you have to do it manually. Messages need a response and resources must be monitored—often over multiple systems and across platforms. How can you be sure you won’t miss important system events? Automate your message center with the Robot Message Management Solution. Key features include:

  • FORTRAThe thought of printing, distributing, and storing iSeries reports manually may reduce you to tears. Paper and labor costs associated with report generation can spiral out of control. Mountains of paper threaten to swamp your files. Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing. Manage your reports with the Robot Report Management Solution. Key features include:

  • FORTRAFor over 30 years, Robot has been a leader in systems management for IBM i. With batch job creation and scheduling at its core, the Robot Job Scheduling Solution reduces the opportunity for human error and helps you maintain service levels, automating even the biggest, most complex runbooks. Manage your job schedule with the Robot Job Scheduling Solution. Key features include:

  • LANSA Business users want new applications now. Market and regulatory pressures require faster application updates and delivery into production. Your IBM i developers may be approaching retirement, and you see no sure way to fill their positions with experienced developers. In addition, you may be caught between maintaining your existing applications and the uncertainty of moving to something new.

  • LANSAWhen it comes to creating your business applications, there are hundreds of coding platforms and programming languages to choose from. These options range from very complex traditional programming languages to Low-Code platforms where sometimes no traditional coding experience is needed. Download our whitepaper, The Power of Writing Code in a Low-Code Solution, and:

  • LANSASupply Chain is becoming increasingly complex and unpredictable. From raw materials for manufacturing to food supply chains, the journey from source to production to delivery to consumers is marred with inefficiencies, manual processes, shortages, recalls, counterfeits, and scandals. In this webinar, we discuss how:

  • The MC Resource Centers bring you the widest selection of white papers, trial software, and on-demand webcasts for you to choose from. >> Review the list of White Papers, Trial Software or On-Demand Webcast at the MC Press Resource Center. >> Add the items to yru Cart and complet he checkout process and submit

  • Profound Logic Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.

  • SB Profound WC 5536Join us for this hour-long webcast that will explore:

  • Fortra IT managers hoping to find new IBM i talent are discovering that the pool of experienced RPG programmers and operators or administrators with intimate knowledge of the operating system and the applications that run on it is small. This begs the question: How will you manage the platform that supports such a big part of your business? This guide offers strategies and software suggestions to help you plan IT staffing and resources and smooth the transition after your AS/400 talent retires. Read on to learn: