?? database.readme
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/database December 2006This subdirectory contains the IDL procedures, mostly written by Don Lindler,(ACC/Goddard) to create and access an IDL database. Although the coresoftware is quite old (written in 1987?), it still allows the use of a simpledatabase well suited to the IDL environment. The LaTex file database.tex in the/text directory describes the use of the database procedures with an emphasison astronomical applications. The database procedures require the non-standard system variables!PRIV, !TEXTOUT, and !TEXTUNIT. These can be added to the IDL session by using the procedure ASTROLIB.Sample astronomical catalogs, formatted as IDL databases, are available in the/zdbase directory. These include the Yale Bright Star Catalog, the RC3 Galaxy catalog, and a catalog of HST observations.Dec-2006: Automatically enlarge the index (.dbx) file if necessary. Avoid use of EXECUTE() if possible.Nov-2006: A version of DBBUILD in the /V61 directory now allows up to 50 input items, and does not use the EXECUTE() routine.26-Sep-2006: Removed DBCOMPRESS since DBDELETE now calls TRUNCATE_LUN to compress the file after removing entries. 14-Jul-2006: DBCREATE - New MAXENTRY keyword to override hardcoded #maxentries 24-Sep-2002: DBTARGET() - Find database entries within specified radius of supplied astronomical target name. 20-Sep-2002: DBPRINT - New /AdjustFormat will adjust the format length for string items to the maximum length for the entries to be printed. 23-Jul-2001: DBCREATE, DBFIND, DBFIND_SORT, DBXVAL, DBINDEX_BLK, DBBUILD - Now allow user to specify items with 64 bit or unsigned integer datatypes.2-Dec-2000: DBINDEX, DBEXT_IND - Now allow multiple-valued index items Minor updates to database.tex file17-Nov-2000: DBFIND, DBFIND_ENTRY, DBFIND_SORT, DBSEARCH, IMDBASE - Now have a Count keyword; deprecate use of !ERR11-Oct-2000: DBXVAL - Work for multiple-valued strings08-Aug-2000: DBPRINT - Change a loop index to type LONG (sigh...)5-Feb-2000: DBPRINT - Only byteswap when necessary, for much improved speed.1-Nov-1999: DBINDEX, DBEXT_DBF - Now allow a maximum of 18 instead of 15 items
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