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Write YAJL docNode to IFS

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  • Write YAJL docNode to IFS

    Scott recently added a third parameter to this function so you can save your incoming JSON right to the IFS. It's awesome.

    Code:
    docNode = yajl_stdin_load_tree(*on : errMsg : filename);

    However, now I'm finding I actually want to work with the incoming JSON a bit before saving it. Is there a command to write docNode, which I believe is a pointer (like yajl_val) to the IFS or would I need to convert that to a string and then do an IFS_WRITE?



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  • #2
    In case it helps anyone else, I went this route. I probably found it in one of Scott's presentations

    Code:
    d retstr                  s                   sqltype(clob:2000000)
    d VARPREF         c                   const(2)      
    d VARPREF4       c                   const(4)      
    d char                   s            1c   ccsid(1200)    ​
    
    
    
    docNode = yajl_stdin_load_tree(*on : errMsg);
    
    x = yajl_stringify( docNode                          
                      : %addr(retstr) + VARPREF4          
                      : %len(retstr) * %size(char)        
                      );                                  
    if (x > 0);                                          
     ​   exec sql 
        CALL QSYS2.IFS_WRITE_UTF8(PATH_NAME => :filename,    
                                  LINE => trim(:retstr),    
                             OVERWRITE => 'APPEND',          
                           END_OF_LINE => 'CRLF');          
    endif;                                                    ​
    Last edited by mjhaston; 2 weeks ago. Reason: Edited to add the missing "exec sql"
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    • #3
      You certainly didn't gt that "CALL QSYS2.IFSWRITE" business from me. I would never do that...

      Also, wouldn't you need an "EXEC SQL" in there to do that CALL statement? Pretty sure this code won't work as given.

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      • #4
        I really don't understand this whole thread. You want to receive a JSON document inside a program that's acting as a REST API. Then you apparently want to re-generate a whole new JSON document from it and save that to the IFS rather than saving the original one via yajl_stdin_load_tree. Why do that? Has the data in the JSON changed somehow?

        Why not just read the JSON into your program instead of letting yajl_stdin_load_tree do it for you? Then parse it with yajl_string_load_tree or yajl_buf_load_tree?

        I just don't understand what you're trying to do, here.

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        • #5
          docNode = yajl_stdin_load_tree(*on : errMsg : filename);

          This works great and is a perfect solution to save the JSON automatically, but later I found that I needed to make sure the sessionid sent with that JSON was valid before writing to the IFS.

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          • #6
            By the way, instead of hardcoding the length of the varying length prefix like this:
            Code:
            %addr(retstr) + VARPREF4
            you can use *DATA with %ADDR like this:
            Code:
            %addr(retstr : *data)
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