RE: dynamic SQL in RPG

["Russell Conerly" <rconerly@xxxxxxxxxxx>]

James,

It looks like a "AND" is missing on the vendor search...maybe I'm just
looking at it wrong.  Does the SEARCHVND field end with a % sign?

Suggestion,  put the program into debug and then look at the job log.  It
should tell you whether the prepare statement completed or not.  If not it
is probably the syntax of the statement.

Good Luck,

Russell Conerly
Tupelo, MS


> On Wed, 31 Mar 2004, Bob Cozzi wrote:
>
>> Look at the PREPARE and DECLARE SQL statements. They will do what you
>> want.
>
> That's exactly what I've been looking at.  Everything that I've tried
> doesn't work.  I'll post some actual code so maybe someone will point out
> where I'm being stupid.
>
> C                   if        (SHVNDNAME = *blanks)
> C                   eval      sqlstatement = 'SELECT POHDRP.POCOMP#,' +
> C                                     'POHDRP.POLOC#,POHDRP.POPO#,' +
> C                                     'POHDRP.POPOSUF,POHDRP.POWO#,' +
> C                                     'POHDRP.POPODATE,POHDRP.POSUPNAME '+
> C                                     'FROM POHDRP ' +
> C                                     'WHERE POHDRP.POPO# >= ' +
> C                                     %trim(%editc(SHPO#:'3')) + ' ' +
> C                                     'AND POHDRP.POCOMP# IN (' +
> C                                     %trim(%editc(co#0:'3')) + ',' +
> C                                     %trim(%editc(co#1:'3')) + ',' +
> C                                     %trim(%editc(co#2:'3')) + ') ' +
> C                                     'ORDER BY POHDRP.POCOMP#,' +
> C                                     'POHDRP.POLOC#,POHDRP.POPO#,' +
> C                                     'POHDRP.POPOSUF'
> C*
> C                   else
> C                   eval      sqlstatement = 'SELECT POHDRP.POCOMP#,' +
> C                                     'POHDRP.POLOC#,POHDRP.POPO#,' +
> C                                     'POHDRP.POPOSUF,POHDRP.POWO#,' +
> C                                     'POHDRP.POPODATE,VENDORP.VMNAME ' +
> C                                     'FROM POHDRP,VENDORP ' +
> C                                     'WHERE POHDRP.POPO# >= ' +
> C                                     %trim(%editc(SHPO#:'3')) + ' ' +
> C                                   'VENDORP.VMVNDRID=POHDRP.POSUPPLIER'+
> C                                     ' AND VENDORP.VMNAME LIKE ' +
> C                                     searchvnd + ' ' +
> C                                     'AND POHDRP.POCOMP# IN (' +
> C                                     %trim(%editc(co#0:'3')) + ',' +
> C                                     %trim(%editc(co#1:'3')) + ',' +
> C                                     %trim(%editc(co#2:'3')) + ') ' +
> C                                     'ORDER BY POHDRP.POCOMP#,' +
> C                                     'POHDRP.POLOC#,POHDRP.POPO#,' +
> C                                     'POHDRP.POPOSUF'
> C                   endif
> C*
> C/EXEC SQL
> C+ PREPARE S1 FROM :sqlstatement
> C/END-EXEC
> C/EXEC SQL
> C+ DECLARE C1 CURSOR FOR S1
> C/END-EXEC
> C/EXEC SQL
> C+ OPEN C1
> C/END-EXEC
>
> Notice that the difference between the two if conditions is that the first
> does use the vendor name and part of the selection criteria and the second
> does (as well and joining with another file).  When I run this it does
> work.  I tried putting the PREPARE statement inside the if conditionals
> and that doesn't work, either.
>
> I don't want to just have variables in the select statement (like using
> :variablename for instance) but I want to dynamically change the entire
> sql statement.
>
> This is a piece of cake with C and MySQL:
>
> if (condition)
> {
>       sprintf (query,
>       "SELECT custnum,description FROM todolistheader WHERE id = %d",
>       job_id);
> }
> else
> {
>       sprintf (query,
>       "SELECT name, nickname FROM customerlist WHERE id = %d",
>       cust_id);
> }
>
> mysql_query (&mysql, query);
>
> Can RPG with SQL really be that much harder?  Am I just being stupid?
>
> James Rich
>
> Zvpebfbsg vf abg gur nafjre.
> Zvpebfbsg vf gur dhrfgvba.
> AB (be Yvahk) vf gur nafjre.
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> haxabja
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