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/**
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* Name: DBReader.java
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* Purpose: A Class that creates an XML text document
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* from a query to a relational DB containing a DOM representation
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Matt Jones
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*
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* Version: '$Id: DBReader.java 35 2000-04-13 16:48:37Z jones $'
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*/
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import java.io.*;
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import java.net.URL;
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import java.net.MalformedURLException;
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import java.sql.*;
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import java.util.Stack;
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/**
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* A Class that creates an XML text document
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* from a query to a relational DB containing a DOM representation
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*/
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public class DBReader {
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static String defaultDB = "jdbc:oracle:thin:@localhost:1521:test";
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private Connection conn = null;
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/**
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* main routine used for testing.
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*
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* Usage: java DBReader <nodeid> <user> <password> [dbstring]
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*
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* @param nodeid the id number of the root of the subtree to display
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* @param user the username to use for the database connection
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* @param password the password to use for the database connection
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* @param dbstring the connection info to use for the database connection
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*/
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static public void main(String[] args) {
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if (args.length < 3)
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{
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System.err.println("Wrong number of arguments!!!");
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System.err.println("USAGE: java DBReader " +
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"<nodeid> <user> <password> [dbstring]");
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return;
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} else {
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try {
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String nodeidstr = args[0];
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long nodeid = (new Long(nodeidstr).longValue());
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String user = args[1];
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String password = args[2];
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String dbstring = null;
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if (args.length <= 3) {
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dbstring = defaultDB;
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} else {
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dbstring = args[3];
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}
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DBReader rd = new DBReader(user, password, dbstring);
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String xml = rd.readXMLDocument(nodeid);
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System.out.println(xml);
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} catch (Exception e) {
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System.err.println("EXCEPTION HANDLING REQUIRED");
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System.err.println(e.getMessage());
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e.printStackTrace(System.err);
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}
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}
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}
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/**
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* construct a DBReader instance.
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*
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* Generally, one calls readXMLDocument() after constructing the instance
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*
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* @param user the username to use for the database connection
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* @param password the password to use for the database connection
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* @param dbstring the connection info to use for the database connection
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*/
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public DBReader( String user, String password, String dbstring)
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throws IOException,
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SQLException,
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ClassNotFoundException
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{
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// Open a connection to the database
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conn = openDBConnection(
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"oracle.jdbc.driver.OracleDriver",
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dbstring, user, password);
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}
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/** open a connection to the database with the supplied information */
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private Connection openDBConnection(String dbDriver, String connection,
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String user, String password)
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throws SQLException, ClassNotFoundException {
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// Load the Oracle JDBC driver
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Class.forName (dbDriver);
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// Connect to the database
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Connection conn = DriverManager.getConnection( connection, user, password);
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return conn;
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}
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/**
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* Create an XML document from the database starting with the element
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* having element_id nodeid
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*
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* @param nodeid the node that will represent the root of the document
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*/
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public String readXMLDocument(long nodeid) {
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StringBuffer doc = new StringBuffer();
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ReaderElement element = new ReaderElement(conn, nodeid);
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doc.append("<?xml version=\"1.0\"?>\n");
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doc.append(element.toString());
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return (doc.toString());
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}
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}
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