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/**
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* Name: DBSimpleQuery.java
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* Purpose: A Class that searches a relational DB for elements and
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* attributes that have free text matches to the query string.
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* It returns a result set consisting of the root nodeid for
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* each document that satisfies the query
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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: '$Id$'
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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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import java.util.Hashtable;
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import java.util.Enumeration;
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/**
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* A Class that searches a relational DB for elements and attributes that
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* have free text matches to the query string. It returns a result set
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* consisting of the root nodeid for each document that satisfies the query
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*/
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public class DBSimpleQuery {
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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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* the main routine used to test the DBSimpleQuery utility.
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*
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* Usage: java DBSimpleQuery <query> <user> <password> [dbstring]
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*
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* @param query the text to search for in the element and attribute content
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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 DBSimpleQuery " +
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"<query> <user> <password> [dbstring]");
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return;
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} else {
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try {
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String query = args[0];
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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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// Execute the simple query
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DBSimpleQuery rd = new DBSimpleQuery(user, password, dbstring);
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Hashtable nodelist = rd.findRootNodes(query);
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// Print the reulting root nodes
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StringBuffer result = new StringBuffer();
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long nodeid;
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result.append("<?xml version=\"1.0\"?>\n");
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result.append("<resultset>\n");
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Enumeration rootlist = nodelist.keys();
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while (rootlist.hasMoreElements()) {
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nodeid = ((Long)rootlist.nextElement()).longValue();
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result.append(" <nodeid>").append(nodeid).append("</nodeid>\n");
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}
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result.append("</resultset>");
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System.out.println(result);
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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 an instance of the DBSimpleQuery class
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*
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* Generally, one would call the findRootNodes() routine after creating
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* an instance to specify the query to search for
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*
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* @param query the text to search for in the element and attribute content
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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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private DBSimpleQuery( 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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/** Utility message to establish a JDBC database connection */
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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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31
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jones
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/**
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* routine to search the elements and attributes looking to match query
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*
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* @param query the text to search for
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*/
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public Hashtable findRootNodes(String query) {
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Hashtable nodeListResult = new Hashtable();
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Hashtable rootListResult = new Hashtable();
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PreparedStatement pstmt;
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long nodeid;
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try {
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pstmt =
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conn.prepareStatement("SELECT nodeid " +
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"FROM xml_nodes WHERE nodedata LIKE ?");
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// Bind the values to the query
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pstmt.setString(1, query);
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pstmt.execute();
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try {
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ResultSet rs = pstmt.getResultSet();
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try {
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boolean tableHasRows = rs.next();
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while (tableHasRows) {
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try {
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nodeid = rs.getLong(1);
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nodeListResult.put(new Long(nodeid),new Long(nodeid));
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} catch (SQLException e) {
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System.out.println("Error with getInt: " + e.getMessage());
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}
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// Advance to the next record in the cursor
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tableHasRows = rs.next();
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}
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} catch (SQLException e) {
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System.out.println("Error with next: " + e.getMessage());
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}
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} catch (SQLException e) {
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System.out.println("Error with getrset: " + e.getMessage());
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}
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pstmt.close();
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} catch (SQLException e) {
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System.out.println("Error getting id: " + e.getMessage());
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}
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Enumeration nodelist = nodeListResult.keys();
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while (nodelist.hasMoreElements()) {
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nodeid = ((Long)nodelist.nextElement()).longValue();
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try {
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pstmt =
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conn.prepareStatement("SELECT nodeid " +
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"FROM xml_nodes START WITH nodeid = ? " +
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"CONNECT BY nodeid = PRIOR parentnodeid");
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// Bind the values to the query
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pstmt.setLong(1, nodeid);
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pstmt.execute();
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try {
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ResultSet rs = pstmt.getResultSet();
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try {
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boolean tableHasRows = rs.next();
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while (tableHasRows) {
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try {
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nodeid = rs.getLong(1);
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} catch (SQLException e) {
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System.out.println("Error with getInt: " + e.getMessage());
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}
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// Advance to the next record in the cursor
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tableHasRows = rs.next();
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}
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} catch (SQLException e) {
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System.out.println("Error with next: " + e.getMessage());
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}
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} catch (SQLException e) {
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System.out.println("Error with getrset: " + e.getMessage());
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}
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pstmt.close();
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} catch (SQLException e) {
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System.out.println("Error getting id: " + e.getMessage());
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}
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// Record that the last record should be the root
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rootListResult.put(new Long(nodeid),new Long(nodeid));
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}
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return rootListResult;
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}
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}
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