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MDRYAJLR4 copybook

This copybook contains RPG Prototypes for YAJL with mdr_ prefix. The procedures for these functions are found in the MDRYAJLR4 *SRVPGM, which is bound in by the MDRFRAME Binding directory.

mdr_beginArray

If called without parameter or with blank parameter, it starts non-labeled array. If parameter, writes an labeled array eg. "myarray": [

  • @param (input/opt) array label
  • @return Yajl generation status
dcl-pr mdr_beginArray int(10) extproc('YAJL_BEGINARRAY');
  label varchar(65535) const options(*varsize:*nopass);
end-pr;

mdr_endArray

Ends the array by adding closing square bracket - @return: Yajl generation status

dcl-pr mdr_endArray int(10) extproc('YAJL_ENDARRAY')
end-pr;

mdr_beginObject

if called without parameter or with blank parameter, it starts non-labeled object. Otherwise, it writes labeled object eg. "myobject": {

  • @param (input/opt) array label
  • @return Yajl generation status
dcl-pr mdr_beginObject int(10) extproc('YAJL_BEGINOBJ');
  label varchar(65535) const options(*varsize:*nopass);
end-pr;

mdr_endObject

ends the object by adding closing curly bracket

  • @return Yajl generation status
dcl-pr mdr_endObject int(10) extproc('YAJL_ENDOBJ')
end-pr;

mdr_addNull

Add a null value to a JSON data stream

  • @param label (input) = label of property to add to object value of 'label' will be set to null. e.g "name": null

  • @return Yajl generation status

dcl-pr mdr_addNull int(10) extproc('YAJL_ADDNULL');
  value varchar(65535) const options(*varsize:*nopass);
end-pr;

mdr_addChar

Add a character value to the JSON data stream if one parameter: add character string to add to JSON stream if two parameters: key of property to add to object, and value

  • @param label (input) = key of property to add to object

  • @param value (input) = character string to set as property value

if the third parameter is given:

  • @param isNull (input) = if *ON output is null, otherwise is value above

  • @return yajl_gen_status_ok upon success, or generator status code upon failure. Example: mdr_addChar('name':mdlReq.name:mdlReq.name=' ');

    if mdlReq.name is blank, then the JSON will look like this:
"name": null

if mdlReq.name is 'stuart', then the JSON will look like this:
"name": "stuart"

dcl-pr mdr_addChar int(10) extproc('YAJL_ADDCHAR');
  label varchar(65535) const options(*varsize);
  value varchar(65535) const options(*varsize:*nopass:*omit);
  isnull ind const options(*nopass:*omit);
end-pr;

mdr_addNum

Add a numeric value to the JSON data stream if one parameter: add number to JSON stream (in string form) if two parameters: key of property to add to object, and value

  • @param label (input) = key of property to add to object

  • @param value (input) = number to set as property value (in string form)

if the third parameter is given:

  • @param isNull (input) = if *ON output is null, otherwise is value above

  • @return yajl_gen_status_ok upon success, or generator status code upon failure.

dcl-pr mdr_addNum int(10) extproc('YAJL_ADDNUM');
  label varchar(65535) const options(*varsize);
  value varchar(65535) const options(*varsize:*nopass:*omit);
  isnull ind const options(*nopass:*omit);
end-pr;

mdr_addBool

Add a boolean value to the JSON data stream if one parameter: RPG indicator, where ON=true, OFF=false to add to JSON data stream if two parameters: key of property to add to object, and value(true or false)

  • @param label (input) = key of property to add to object

  • @param value (input) = RPG indicator to set as a boolean value.

if the third parameter is given:

  • @param isNull (input) = if *ON output is null, otherwise is value above

  • @return yajl_gen_status_ok upon success, or generator status code upon failure.

dcl-pr mdr_addBool int(10) extproc('YAJL_ADDBOOL');
  label varchar(65535) const options(*varsize);
  Value ind const options(*nopass);
  isnull ind const options(*nopass:*omit);
end-pr;

mdr_startJson

Open a YAJL JSON generator mdr_addchar etc functions to build JSON in memory

  • @param beautify (input) = ON would add line breaks and indentation for readability OFF would generate compact JSON
  • @param escSolidus (input) = On would escape the solidus (aka forward slash) characters. default is Off
  • @return: yajl_gen_status_ok (i.e. 0) if successful yajl_gen_open_fail (i.e. 1000001) upon failure
dcl-pr mdr_startJson int(10) Extproc('YAJL_GENOPEN');
  beautify ind const;
  escSolidus ind const options(*nopass);
end-pr;

mdr_endJson

Closes the JSON generation channel and deallocates memory. Subsequently mdr_addchar, mdr_getJson etc cannot be used

dcl-pr mdr_endJson Extproc('YAJL_GENCLOSE')
end-pr;

mdr_getJson

Copies JSON generator buffer to the caller's variable or buffer.

  • @param ccsid = (input) CCSID to convert data to. 0=job CCSID.
  • @param bufptr = (input) Pointer to variable or buffer to copy the data to.
  • @param bufSize = (input) Size of the jsonBuf buffer (in bytes)
  • @param rtnLen = (output) length of data placed in buffer
  • @return YAJL generator status.
dcl-pr mdr_getJson int(10) Extproc('YAJL_COPYBUF');
  ccsid  int(10) value;
  bufptr pointer value;
  bufsize int(10) value;
  rtnlen int(10);
end-pr;

mdr_getJsonPtr

  • @param returns a pointer to JSON internal buffer where JSON data is stored.
  • @param rtnptr = (output) pointer to YAJL's generator buffer
  • @param rtnlen = (output) length of returned buffer in bytes
  • @return YAJL generator status.
dcl-pr mdr_getJsonPtr int(10) Extproc('YAJL_GETBUF');
  bufptr pointer;
  bufsize uns(10);
end-pr;

mdr_getJsonStr

  • @return the current JSON buffer to an RPG variable of max 2000000 size. Receiving variable must be a varchar. It is not optimized and for larger payloads can impact performance. If so, se mdr_getJson for larger size or better performance.
dcl-pr mdr_getJsonStr varucs2(2000000) extproc('YAJL_COPYBUFSTR')
end-pr;

MDR_addTimestamp

Adds an ISO 8601 timestamp in: YYYY-MM-DDTHH:MM:SS.sss format to the JSON document.

  • @param (input) name = key name if within an object, or *omit
  • @param (input) val = standard RPG timestamp field
  • @param (input/opt) tz = time zone to use, examples are: 'Z' = UTC '+0500' = 5 hours east of UTC '-0600' = 6 hours west of UTC ' ' = local time '*UTC' (default) Convert to UTC and report as a UTC timestamp
  • @param (input) datesep = date separator (default: -)
  • @param (input) timesep = time separator (default: :)
  • @param (input) tzsep = timezone sep (default: none)
  • @return returns yajl_gen_status_ok upon success, or generator status code upon failure.
dcl-pr MDR_addTimestamp extproc('YAJL_ADDTIMESTAMP');
  name           Varchar(65535) CONST OPTIONS(*VARSIZE:*OMIT);
  val            Timestamp  CONST;
  tz             Varchar(6)  CONST OPTIONS(*OMIT:*NOPASS);
  datesep        Varchar(1)  CONST OPTIONS(*OMIT:*NOPASS);
  timesep        Varchar(1)  CONST OPTIONS(*OMIT:*NOPASS);
  tzsep          Varchar(1)  CONST OPTIONS(*OMIT:*NOPASS);
  isnull         ind         CONST OPTIONS(*OMIT:*NOPASS);
end-pr;

mdr_getEntry

  • @return the value at the specified key node. e.g. for the node "city":"Paris", it will return "Paris". The node value must be of string type, otherwise, it will return blank
dcl-pr mdr_getEntry varchar(1024) extproc('YAJL_GETSTRKEY');
  bgnNode pointer value;
  entry varchar(50) const;
end-pr;

mdr_GetNumKey

  • @return the numeric value in string form at the specified key node. for the node "orderno":57689, it will return '57689'. The node must be of numeric type. Otherwise, it returns blank
dcl-pr mdr_GetNumKey varchar(50) extproc('YAJL_GETNUMSTR');
  node pointer value;
end-pr;

MDR_object_insert

Inserts a new node into an object in a YAJL tree structure

  • @param node = (i/o) object node to insert into
  • @param type = (input) type of node to insert (one of the MDR_t_xxx constants below)
  • @param newKey = (input) new key name to insert
  • @param newVal = (input) string representation of new value to insert (only used for numbers/strings)
  • @param rel = (input/opt) relationship to refKey (MDR_xx below)
  • @param refKey = (input/opt) key to reference when inserting
  • @return the newly created node (yajl_val) or *NULL upon failure
dcl-pr MDR_object_insert Pointer extproc('YAJL_OBJECT_INSERT');
  node           Pointer        VALUE;
  type           Int(10)        VALUE;
  newKey         Varchar(1024)  CONST OPTIONS(*VARSIZE);
  newVal         Varchar(65535) CONST OPTIONS(*VARSIZE);
  xrel           Int(10)        VALUE OPTIONS(*NOPASS);
  refKey         Varchar(1024)  CONST OPTIONS(*VARSIZE: *NOPASS: *OMIT);
end-pr;

Constants

Dcl-C MDR_before  CONST(1);
Dcl-C MDR_after   CONST(2);
Dcl-C MDR_replace CONST(3);
Dcl-C MDR_append  CONST(X'1FFFFFFF');

Dcl-C MDR_t_string CONST(1);
Dcl-C MDR_t_number CONST(2);
Dcl-C MDR_t_object CONST(3);
Dcl-C MDR_t_array  CONST(4);
Dcl-C MDR_t_true   CONST(5);
Dcl-C MDR_t_false  CONST(6);
Dcl-C MDR_t_null   CONST(7);

MDR_array_add

Adds data to the end of an array in a tree node - @param node = (i/o) array node to add onto - @param type = (input) type of node to insert (one of the yajl_t_xxx constants - @param newVal = (input) string representation of new value to insert (only used for numbers/strings) - @return the newly created node (yajl_val) or *NULL upon failure

dcl-pr MDR_array_add Pointer extproc('YAJL_ARRAY_ADD');
  node           Pointer        VALUE;
  type           Int(10)        VALUE;
  newVal         Varchar(65535) CONST OPTIONS(*VARSIZE);
end-pr;