Metacat

/*

 * xmltables.sql -- Create or replace tables for storing XML in the db

 *

 *      Purpose: creates tables needed for XML database

 * 

 *      Created: 12 September 1999

 *       Author: Matt Jones

 * Organization: National Center for Ecological Analysis and Synthesis

 *    Copyright: 2000 Regents of the University of California and the

 *               National Center for Ecological Analysis and Synthesis

 *  For Details: http://www.nceas.ucsb.edu/

 *    File Info: '$Id: xmltables.sql 123 2000-06-07 00:44:37Z jones $'

 *

 */

/*

 * Drop all of the objects in proper order

 */

set echo off

DROP SEQUENCE xml_nodes_id_seq;

DROP SEQUENCE xml_catalog_id_seq;

DROP SEQUENCE xml_documents_id_seq;

DROP TRIGGER xml_nodes_before_insert;

DROP TRIGGER xml_documents_before_insert;

DROP TRIGGER xml_catalog_before_insert;

DROP TABLE xml_index;

DROP TABLE xml_catalog;

DROP TABLE xml_documents;

DROP TABLE xml_nodes;

/* 

 * Nodes -- table to store XML Nodes (both elements and attributes)

 */

CREATE TABLE xml_nodes (

	nodeid		NUMBER(20),	-- the unique node id (pk)

	nodeindex	NUMBER(10),	-- order of nodes within parent

	nodetype	VARCHAR2(20),	-- type (DOCUMENT, COMMENT, PI,

					-- ELEMENT, ATTRIBUTE, TEXT)

	nodename	VARCHAR2(250),	-- the name of an element or attribute

	nodedata	VARCHAR2(4000), -- the data for this node (e.g., 

					-- for TEXT it is the content)

	parentnodeid	NUMBER(20),	-- index of the parent of this node

	rootnodeid	NUMBER(20),	-- index of the root node of this tree

	docid		NUMBER(20),	-- index to the document id

	date_created	DATE,

	date_updated	DATE,

   CONSTRAINT xml_nodes_pk PRIMARY KEY (nodeid),

   CONSTRAINT xml_nodes_root_fk 

		FOREIGN KEY (rootnodeid) REFERENCES xml_nodes,

   CONSTRAINT xml_nodes_parent_fk 

		FOREIGN KEY (parentnodeid) REFERENCES xml_nodes

);

CREATE SEQUENCE xml_nodes_id_seq;

CREATE TRIGGER xml_nodes_before_insert

BEFORE INSERT ON xml_nodes FOR EACH ROW

BEGIN

  SELECT xml_nodes_id_seq.nextval

    INTO :new.nodeid

    FROM dual;

END;

/

/* 

 * Documents -- table to store XML documents

 */

CREATE TABLE xml_documents (

	docid		NUMBER(20),	-- the document id #

	rootnodeid	NUMBER(20),	-- refernce to the root node of the DOM

	docname		VARCHAR2(100),	-- usually the root element name

	doctype		VARCHAR2(100),	-- public id indicating document type

	doctitle	VARCHAR2(1000),	-- title of document if exists

	date_created	DATE,

	date_updated	DATE,

   CONSTRAINT xml_documents_pk PRIMARY KEY (docid),

   CONSTRAINT xml_documents_root_fk 

		FOREIGN KEY (rootnodeid) REFERENCES xml_nodes

);

CREATE SEQUENCE xml_documents_id_seq;

CREATE TRIGGER xml_documents_before_insert

BEFORE INSERT ON xml_documents FOR EACH ROW

BEGIN

  SELECT xml_documents_id_seq.nextval

    INTO :new.docid

    FROM dual;

END;

/

/* 

 * XML Catalog -- table to store all external sources for XML documents

 */

CREATE TABLE xml_catalog (

	catalog_id	NUMBER(20),	-- the id for this catalog entry

	entry_type	VARCHAR2(500),	-- the type of this catalog entry

					-- (e.g., DTD, XSD, XSL)

	source_doctype	VARCHAR2(500),	-- the source public_id for transforms

	target_doctype	VARCHAR2(500),	-- the target public_id for transforms

	public_id	VARCHAR2(500),	-- the unique id for this type

	system_id	VARCHAR2(1000),	-- the local location of the object

   CONSTRAINT xml_catalog_pk PRIMARY KEY (catalog_id)

   -- CONSTRAINT xml_catalog_uk UNIQUE (entry_type, source_doctype, target_doctype, public_id)

);

CREATE SEQUENCE xml_catalog_id_seq;

CREATE TRIGGER xml_catalog_before_insert

BEFORE INSERT ON xml_catalog FOR EACH ROW

BEGIN

  SELECT xml_catalog_id_seq.nextval

    INTO :new.catalog_id

    FROM dual;

END;

/

/* 

 * Index of Nodes -- table to store precomputed paths through tree for 

 * quick searching in structured searches

 */

CREATE TABLE xml_index (

	nodeid		NUMBER(20),	-- the unique node id

	path		VARCHAR2(20),	-- precomputed path through tree

   CONSTRAINT xml_index_pk PRIMARY KEY (nodeid,path),

   CONSTRAINT xml_nodes_fk FOREIGN KEY (nodeid) REFERENCES xml_nodes

);