STAG-DB(1p)						User Contributed Perl Documentation					       STAG-DB(1p)

NAME

       stag-db - persistent storage and retrieval for stag data (xml, sxpr, itext)

SYNOPSIS

	 stag-db -r person -k social_security_no -i ./person-idx myrecords.xml
	 stag-db -i ./person-idx -q 999-9999-9999 -q 888-8888-8888

DESCRIPTION

       Builds a simple file-based database for persistent storage and retrieval of nodes from a stag compatible document.

       Imagine you have a very large file of data, in a stag compatible format such as XML. You want to index all the elements of type person;
       each person can be uniquely identified by social_security_no, which is a direct subnode of person

       The first thing to do is to build an index file, which will be stored in your current directory:

	 stag-db -r person -k social_security_no -i ./person-idx myrecords.xml

       You can then use the index "person-idx" to retrieve person nodes by their social security number

	 stag-db -i ./person-idx -q 999-9999-9999 > some-person.xml

       You can export using different stag formats

	 stag-db -i ./person-idx -q 999-9999-9999 -w sxpr > some-person.xml

       You can retrieve multiple nodes (although these need to be rooted to make a valid file)

	 stag-db -i ./person-idx -q 999-9999-9999 -q 888-8888-8888 -top personset

       Or you can use a list of IDs from a file (newline delimited)

	 stag-db -i ./person-idx -qf my_ss_nmbrs.txt -top personset

   ARGUMENTS
       -i INDEXFILE

       This file will be used as the persistent index for storage/retrieval

       -r RELATION-NAME

       This is the name of the stag node (XML element) that will be stored in the index; for example, with the XML below you may want to use the
       node name person and the unique key id

	 <person_set>
	   <person>
	     <id>...</id>
	   </person>
	   <person>
	     <id>...</id>
	   </person>
	   ...
	 </person_set>

       This flag should only be used when you want to store data

       -k UNIQUE-KEY

       This node will be used as the unique/primary key for the data

       This node should be nested directly below the node that is being stored in the index - if it is more that one below, specify a path

       This flag should only be used when you want to store data

       -u UNIQUE-KEY

       Synonym for -k

       -p PARSER

       This can be the name of a stag supported format (xml, sxpr, itext) - XML is assumed by default

       It can also be a module name - this module is used to parse the input file into a stag stream; see Data::Stag::BaseGenerator for details on
       writing your own parsers/event generators

       This flag should only be used when you want to store data

       -q QUERY-ID

       Fetches the relation/node with unique key value equal to query-id

       Multiple arguments can be passed by specifying -q multple times

       This flag should only be used when you want to query data

       -top NODE-NAME

       If this is specified in conjunction with -q or -qf then all the query result nodes will be nested inside a node with this name (ie this
       provides a root for the resulting document tree)

       -qf QUERY-FILE

       This is a file of newline-seperated IDs; this is useful for querying the index in batch

       -keys

       This will write a list of all primary keys in the index

       -w WRITER

       This format will be used to write the data; can be any stag format (xml, sxpr, itext) - default XML.

       Can also be a module that catches the incoming stag event stream and does something with it (for example, this could be a module you write
       yourself that transforms the stag events into HTML)

SEE ALSO

       Data::Stag

       For more complex stag to database mapping, see DBIx::DBStag and the scripts

       stag-storenode

       selectall_xml

perl v5.10.0							    2008-12-23							       STAG-DB(1p)