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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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package edu.ucsb.nceas.metacat;
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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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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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* <p>
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* Usage: java DBSimpleQuery <query>
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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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*/
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static public void main(String[] args) {
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if (args.length < 2)
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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 <query> <doctype>");
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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 doctype = args[1];
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// Open a connection to the database
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MetaCatUtil util = new MetaCatUtil();
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Connection dbconn = util.openDBConnection();
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// Execute the simple query
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DBSimpleQuery rd = new DBSimpleQuery(dbconn);
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Hashtable nodelist = null;
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if (doctype.equals("any") || doctype.equals("ANY")) {
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nodelist = rd.findDocuments(query);
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} else {
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nodelist = rd.findDocuments(query, doctype);
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}
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// Print the reulting root nodes
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StringBuffer result = new StringBuffer();
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String document = null;
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String docid = null;
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result.append("<?xml version=\"1.0\"?>\n");
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result.append("<resultset>\n");
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result.append(" <query>" + query + "</query>\n");
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Enumeration doclist = nodelist.keys();
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while (doclist.hasMoreElements()) {
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docid = (String)doclist.nextElement();
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document = (String)nodelist.get(docid);
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result.append(" <document>\n " + document +
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"\n </document>\n");
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}
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result.append("</resultset>\n");
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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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* <p>Generally, one would call the findDocuments() routine after creating
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* an instance to specify the search query</p>
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*
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* @param conn the JDBC connection that we use for the query
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*/
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public DBSimpleQuery( Connection conn )
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throws IOException,
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SQLException,
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ClassNotFoundException
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{
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this.conn = conn;
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}
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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 findDocuments(String query) {
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return this.findDocuments(query, null);
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}
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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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* @param requestedDoctype the type of documents to return from the query
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*/
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public Hashtable findDocuments(String query, String requestedDoctype) {
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Hashtable docListResult = new Hashtable();
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PreparedStatement pstmt;
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// Now look up the document id
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String docid = null;
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String docname = null;
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String doctype = null;
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String doctitle = null;
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//StringBuffer document = null;
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try {
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if (requestedDoctype == null ||
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requestedDoctype.equals("any") ||
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requestedDoctype.equals("ANY")) {
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pstmt = conn.prepareStatement(
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"SELECT docid,docname,doctype,doctitle " +
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"FROM xml_documents " +
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"WHERE docid IN " +
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"(SELECT docid " +
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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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} else {
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pstmt = conn.prepareStatement(
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"SELECT docid,docname,doctype,doctitle " +
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"FROM xml_documents " +
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"WHERE docid IN " +
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"(SELECT docid " +
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"FROM xml_nodes WHERE nodedata LIKE ? ) " +
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"AND doctype = ?");
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// Bind the values to the query
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pstmt.setString(1, query);
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pstmt.setString(2, requestedDoctype);
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}
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pstmt.execute();
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ResultSet rs = pstmt.getResultSet();
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boolean tableHasRows = rs.next();
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while (tableHasRows) {
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docid = rs.getString(1);
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docname = rs.getString(2);
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doctype = rs.getString(3);
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doctitle = rs.getString(4);
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StringBuffer document = new StringBuffer();
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document.append("<docid>").append(docid).append("</docid>");
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if (docname != null) {
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document.append("<docname>" + docname + "</docname>");
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}
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if (doctype != null) {
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document.append("<doctype>" + doctype + "</doctype>");
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}
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if (doctitle != null) {
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document.append("<doctitle>" + doctitle + "</doctitle>");
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}
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// Store the document id and the root node id
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docListResult.put(docid,(String)document.toString());
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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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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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return docListResult;
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}
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}
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