Revision 374
Added by bojilova over 23 years ago
| DBUtil.java | ||
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| 19 | 19 |
import java.sql.SQLException; |
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import java.sql.PreparedStatement; |
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import java.sql.ResultSet; |
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import java.util.Hashtable; |
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import java.util.Enumeration; |
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import java.util.Vector; |
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import java.util.Stack; |
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/** |
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* A suite of utility classes for quering DB |
| ... | ... | |
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if (args.length < 1) |
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{
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System.err.println("Wrong number of arguments!!!");
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System.err.println("USAGE: java DBUtil <-dt | -dg doctype>");
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System.err.println("USAGE: java DBUtil <-dt | -dg [doctype]>");
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return; |
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} else {
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try {
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String dataguide = dbutil.readDataGuide(doctype); |
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System.out.println(dataguide); |
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} else {
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System.err.println("USAGE: java DBUtil <-dt | -dg doctype>");
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System.err.println("USAGE: java DBUtil <-dt | -dg [doctype]>");
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} |
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} catch (Exception e) {
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"ORDER BY nodeid"); |
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pstmt.setString(1, doctype); |
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} else {
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pstmt = conn.prepareStatement("SELECT distinct path, nodeid " +
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pstmt = conn.prepareStatement("SELECT distinct path, doctype, nodeid " +
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"FROM xml_index " + |
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"WHERE path LIKE '/%' " + |
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"ORDER BY nodeid"); |
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"ORDER BY doctype, nodeid");
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} |
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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("DBUtil.readDoctypes(): " + e.getMessage());
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System.out.println("DBUtil.readDataGuide(): " + e.getMessage());
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throw e; |
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} |
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return formatToXML(dataguide, "path");
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return formatToXML(dataguide); |
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} |
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/** |
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* format the DataGuide ResultSet to XML |
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*/ |
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private String formatToXML(Vector resultset) {
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String currPath = null; |
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String currElement = null; |
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String prevElement = null; |
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StringBuffer result = new StringBuffer(); |
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Enumeration rs = resultset.elements(); |
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Stack st = new Stack(); |
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int i = 0; |
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result.append("<?xml version=\"1.0\"?>\n");
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result.append("<resultset>\n");
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while (rs.hasMoreElements()) {
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currPath = (String)rs.nextElement(); |
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while ( !In(prevElement, currPath) ) {
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currElement = (String)st.pop(); |
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result.append(pad(" ",i--) + "</" + currElement + ">\n");
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if ( st.empty() ) |
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prevElement = null; |
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else |
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prevElement = (String)st.peek(); |
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} |
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currElement = getElementFromPath(currPath); |
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st.push(currElement); |
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result.append(pad(" ",++i) + "<" + currElement + ">\n");
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prevElement = currElement; |
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} |
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while ( !st.empty() ) {
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prevElement = (String)st.pop(); |
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result.append(pad(" ",i--) + "</" + prevElement + ">\n");
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} |
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result.append("</resultset>\n");
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return result.toString(); |
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} |
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/** |
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* check if element is in path like /elem1/elem2/elemn3 |
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*/ |
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private boolean In(String element, String path) {
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if ( element == null ) return true; |
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return ( path.indexOf(element) != -1 ); |
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} |
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/** |
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* get last element from path like /elem1/elem2/elemn3 |
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*/ |
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private String getElementFromPath(String path) {
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return ( path.substring(path.lastIndexOf("/")+1) );
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} |
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/** |
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* repeates the str n-times |
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*/ |
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private String pad(String str, int n) {
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String result = ""; |
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for ( int i = 0; i < n; i++ ) |
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result = result.concat(str); |
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return result; |
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} |
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/** |
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* format the ResultSet to XML |
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*/ |
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private String formatToXML(Vector resultset, String tag) {
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String val = null; |
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String doctype = null; |
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StringBuffer result = new StringBuffer(); |
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Enumeration rs = resultset.elements(); |
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Also available in: Unified diff
change the resultset format for DataGuide