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    Search data base for entries with specified characteristics


    Function to search data base for entries with specified
    search characteristics.

Calling Sequence

    result = dbfind(spar,[ listin, /SILENT, /FULLSTRING, ERRMSG=, Count = ])


    spar - search_parameters (string)...each search parameter
              is of the form:
              option 1) min_val < item_name < max_val
              option 2) item_name = value
              option 3) item_name = [value_1, value_10]
                      Note: option 3 is also the slowest.
              option 4) item_name > value
              option 5) item_name < value
              option 6) item_name = value(tolerance) ;eg. temp=25.0(5.2)
              option 7) item_name ;must be non-zero
              Multiple search parameters are separated by a comma.
              eg. 'cam_no=2,14<ra<20'
              Note: < is interpreted as less than or equal.
                    > is interpreted as greater than or equal.
              RA and DEC keyfields are stored as floating point numbers
              in the data base may be entered as HH:MM:SEC and
              DEG:MIN:SEC. Where:
                      HH:MM:SEC equals HH + MM/60.0 + SEC/3600.
                      DEG:MIN:SEC equals DEG + MIN/60.0 + SEC/3600.
              For example:
                      40:34:10.5 < dec < 43:25:19 , 8:22:1.0 < ra < 8:23:23.0
              Specially encoded date/time in the data base may
              be entered by CCYY/DAY:hr:min:sec which is
              interpreted as
              If a two digit year is supplied and YY GE 40 then it is
              understood to refer to year 1900 +YY; if YY LT 40 then it is
              understood to refer to year 2000 +YY
              For example
              would specify all entries between:
                      year 1985 day 201 at 10:35:30 to
                      day 302 at 10:33:33.4
              The date/time may also be encoded as:
                      DD-MMM-YEAR HH::MM:SS.SS
                      eg. 12-JUL-86 10:23:33.45
              (this is the format of system variable !stime)
              Multiple search parameters may be stored in a string
              array (one parameter per array element) instead of
              concatenating them with commas in a single string.


                      input_array = strarr(2)
                      input_array[0] = '14<ra<16' ; 14-16 hrs of ra.
                      input_array[1] = '8<dec<20' ; + 8-20 deg. decl.

Optional Input

      listin - gives list of entries to be searched. If not supplied or
              set to -1 then all entries are searched.


      List of ENTRY numbers satisfying search characteristics
              is returned as the function value.

Optional Input Keywords

      /SILENT - If the keyword SILENT is set and non-zero, then DBFIND
              will not print the number of entries found.
      /FULLSTRING - By default, one has a match if a search string is
              included in any part of a database value (substring match).
              But if /FULLSTRING is set, then all characters in the database
              value must match the search string (excluding leading and
              trailing blanks). Both types of string searches are case
      ERRMSG = If defined and passed, then any error messages will
                  be returned to the user in this parameter rather
                  than depending on the MESSAGE routine in IDL. If no
                  errors are encountered, then a null string is
                  returned. In order to use this feature, ERRMSG must
                  be defined first, e.g.
                      ERRMSG = ''
                      DB_ITEM, ERRMSG=ERRMSG, ...
                      IF ERRMSG NE '' THEN ...;

Optional Output Keyword

      COUNT - Integer scalar giving the number of valid matches

Procedure Calls



      The data base must be previously opened with DBOPEN.

Side Effects

      The obsolete system variable !ERR is set to number of entries found

Revision History

      Written : D. Lindler, GSFC/HRS, November 1987
      Version 2, Wayne Landsman, GSFC/UIT (STX), 1 April 1994
                      Added FULLSTRING keyword.
      Version 3, William Thompson, GSFC, 1 April 1994
                      Added check for empty database
      Version 4, William Thompson, GSFC, 5 April 1994
                      Changed so that !ERR is zero when database is empty,
                      and LISTIN is returned, based on discussion with Wayne
      Version 5, Wayne Landsman, GSFC/UIT (STX), 26 May 1994
                      Added error message when database is empty.
      Version 6, William Thompson, GSFC, 14 March 1995
                      Added FULLSTRING keyword to DBFIND_SORT call
      Version 7, Richard Schwartz, GSFC/SDAC 23 August 1996
                      Move external to host conversion from DBRD to
                      operation on extracted values only.
      Version 8, William Thompson, GSFC, 3 December 1996
                      Renamed BYTESWAP variable to BSWAP--appeared to be
                      conflicting with function of same name.
      Version 9, William Thompson, GSFC, 17-Mar-1997
                      Added keyword ERRMSG
      Version 10, July, 1997 W. Landsman, added CATCH errors
      Converted to IDL V5.0 W. Landsman October 1997
      Update documentation for new Y2K compliant DBFPARSE W. Landsman Nov 1998
      Suppress empty database message with /SILENT, W. Landsman Jan 1999
      Added COUNT keyword, deprecate !ERR W. Landsman March 2000
      Added new unsigned & 64bit datatypes W. Landsman July 2001
      Fix possible floating illegand operand error W. Landsman July 2009
      Change arrays to LONG to support entries >32767 bytes W.L. Oct. 2010

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