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/**
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* Name: DBElement.java
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* Purpose: A Class that represents an XML element and can
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* write its contents to a database connection
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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 com.sun.xml.tree.ElementNode;
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import org.w3c.dom.DOMException;
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import org.w3c.dom.Element;
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import org.w3c.dom.Attr;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import org.w3c.dom.NamedNodeMap;
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import org.w3c.dom.ProcessingInstruction;
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import org.w3c.dom.Text;
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import java.sql.*;
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import java.io.IOException;
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public class DBElement extends ElementNode {
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public DBElement () {
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super();
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};
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/**
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* Writes this element and all of its children out to the
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* given database connection
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*/
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public void writeXmlToDB(Connection conn, int parentID)
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throws IOException {
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int maxid=0;
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int newid=0;
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Statement stmt;
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try {
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stmt = conn.createStatement();
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stmt.execute("SELECT MAX(nodeid) FROM xml_elements");
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try {
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ResultSet rs = stmt.getResultSet();
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try {
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boolean tableHasRows = rs.next();
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if (tableHasRows) {
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try {
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maxid = rs.getInt(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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}
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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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stmt.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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// assign a new ID number
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newid = maxid + 1;
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try {
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PreparedStatement pstmt;
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if (parentID != 0) {
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pstmt = conn.prepareStatement(
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"INSERT INTO xml_elements(nodeid, nodename, parentnodeid) " +
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"VALUES (?, ?, ?)");
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} else {
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pstmt = conn.prepareStatement(
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"INSERT INTO xml_elements(nodeid, nodename) " +
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"VALUES (?, ?)");
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}
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// Bind the values to the query
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pstmt.setInt(1, newid); // The first ? is for NODEID
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pstmt.setString(2, getTagName());// The second ? is for NODENAME
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if (parentID != 0) {
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pstmt.setInt(3, parentID);
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}
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// Do the insertion
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pstmt.execute();
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pstmt.close();
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} catch (SQLException e) {
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System.out.println(e.getMessage());
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}
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System.out.println("ID: " + newid + "\tTag: " + getTagName());
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// Now save this node's attributes
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writeAttributesToDB(conn, newid);
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// Now save this node's children
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if (hasChildNodes()) {
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try {
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writeChildrenXmlToDB(conn, newid);
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} catch (SQLException e) {
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System.out.println(e.getMessage());
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}
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}
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}
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public void writeChildrenXmlToDB(Connection conn, int parentID)
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throws IOException, SQLException {
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NodeList children = getChildNodes();
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if (children != null) {
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for (int i = 0; i < children.getLength(); i++) {
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if (children.item(i) instanceof ElementNode) {
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((DBElement)children.item(i)).writeXmlToDB(conn, parentID);
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} else if (children.item(i) instanceof Text) {
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// Write the text to the now created parent node
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PreparedStatement pstmt = conn.prepareStatement(
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"UPDATE xml_elements SET nodedata = ? " +
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"WHERE nodeid = ?");
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pstmt.setString(1, ((Text)children.item(i)).getNodeValue());
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pstmt.setInt(2, parentID);
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pstmt.execute();
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pstmt.close();
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} else {
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System.out.println(" Other Node Type skipped.");
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}
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}
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}
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}
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/**
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* Writes this element's attributes out to the
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* given database connection
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*/
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public void writeAttributesToDB(Connection conn, int nodeid)
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throws IOException {
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NamedNodeMap attributes = getAttributes();
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if (attributes != null) {
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for (int i=0; i < attributes.getLength(); i++) {
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String name = ((Attr)attributes.item(i)).getName();
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String value = ((Attr)attributes.item(i)).getValue();
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System.out.println(" Saving attribute: " + name + "=" + value);
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int maxid=0;
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int newid=0;
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Statement stmt;
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try {
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stmt = conn.createStatement();
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stmt.execute("SELECT MAX(attributeid) FROM xml_attributes");
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try {
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ResultSet rs = stmt.getResultSet();
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try {
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boolean tableHasRows = rs.next();
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if (tableHasRows) {
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try {
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maxid = rs.getInt(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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}
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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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stmt.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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// assign a new ID number
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newid = maxid + 1;
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try {
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PreparedStatement pstmt;
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pstmt = conn.prepareStatement(
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"INSERT INTO xml_attributes(attributeid, nodeid, " +
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"attributenumber, attributename, attributevalue) " +
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"VALUES (?, ?, ?, ?, ?)");
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// Bind the values to the query
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pstmt.setInt(1, newid); // ATTRIBUTEID
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pstmt.setInt(2, nodeid); // NODEID
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pstmt.setInt(3, i+1); // ATTRIBUTENUMBER
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pstmt.setString(4, name); // ATTRIBUTENAME
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pstmt.setString(5, value); // ATTRIBUTEVALUE
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// Do the insertion
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pstmt.execute();
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pstmt.close();
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} catch (SQLException e) {
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System.out.println(e.getMessage());
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}
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}
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}
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}
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// used by JTree to display this node
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public String toString ()
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{
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StringBuffer value = new StringBuffer ();
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value.append ('<');
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value.append (getTagName ());
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value.append (getAttributes ().toString ());
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value.append ('>');
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return value.toString ();
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}
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}
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