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I am getting some problem when I am connection to
database, using the same
>example JDBCAppl.java, when connected using connectbutton
it gets
>connectted, but when I use the same code outside of event
method, I am
>getting security exception.
>
>Please help me to rectify this programme. I am sending the
entire code here.
>
>
>import java.applet.*;
>import java.awt.*;
>import java.sql.*;
>import java.util.Properties;
>import java.util.Enumeration;
>file://import java.util.*;
>import jdbc.*;
>
>public class JDBCAppl extends Applet {
>
>Connection con; // the database connection
>Label urlLabel; // label set to URL:
>public TextField urlText; // holds the current URL
>Button connectButton; // used to start a database
connection
>Label sqlLabel; // holds the SQL: prompt
>public TextField sqlText; // holds the current SQL
statement
>Button submitButton; // used to submit the SQL
>Label tableLabel; // holds the Tables label
>Label outputLabel; // holds the Output label
>List tableList; // holds list of tables
>public List rowList; // list of rows selected
>Label statusLabel; // show operational status
>Button disconnectButton; // used to disconnect
>Button browseButton; // used to browse for a url
>FileDialog urlBrowse; // the file dialog used to browse
>public TextArea displayText; // used to show full contents
of selected
>row
>boolean v;
>/**
>* Loads some popular JDBC drivers.
>*/
>void loadDrivers () {
>String[] drivers = {"jdbc.idbDriver", "RmiJdbc.RJDriver",
>"sun.jdbc.odbc.JdbcOdbcDriver"};
>for (int i=0; i<drivers.length; i++) {
>try {
>System.out.print ("Loading driver: "+drivers[i]+"...");
>Class.forName (drivers[i]).newInstance();
>System.out.println ("success");
>} catch (Exception e) {
>System.out.println ("failed. Error="+e);
>} // try-catch
>} // for
>} // method loadDrivers
>
>/**
>* Sets the URL
>*/
>void setUrl (String s) {
>urlText.setText(s);
>} // method setUrl
>
>
>public void init () {
>try {
>DriverManager.setLogStream (System.out);
>loadDrivers();
>
>// create the components for the applet
>urlLabel = new Label ("URL:");
>urlText = new
>TextField
("jdbc:idb:C:\\AFI_MASTER\\JapanIDBtest\\JapanAfiMaster.prp"
);
>connectButton = new Button ("Connect");
>sqlLabel = new Label ("SQL:");
>sqlText= new TextField ("");
>submitButton = new Button ("Submit");
>tableLabel = new Label ("Tables");
>outputLabel = new Label ("Results");
>tableList = new List ();
>rowList = new List();
>statusLabel = new Label ("Enter a URL and click on
Connect");
>disconnectButton = new Button ("Disconnect");
>browseButton = new Button ("Browse");
>displayText = new TextArea(4,40);
>
>// overall layout is 3 panels - top, center and bottom
>Panel top = new Panel (); // top part of applet
>Panel center = new Panel (); // center part of applet
>setLayout (new BorderLayout(5,5)); // overall layout is a
NSEWC one
>add ("North", top);
>add ("Center", center);
>// add ("South", displayText);
>
>// set the top panel - consists of three more horizontally
arranged
>panels
>top.setLayout (new BorderLayout(5, 5)); // give it
distinct center
>Panel topLeft = new Panel (); // holds the prompt labels
>Panel topCenter = new Panel (); // holds the text fields
>Panel topRight = new Panel (); // holds the buttons
>top.add ("West", topLeft);
>top.add ("Center", topCenter);
>top.add ("East", topRight);
>
>// Each of the top panels has a 2 rows x 1 col grid (2 for
right panel)
>topLeft.setLayout (new GridLayout (2,1,5,5));
>topCenter.setLayout (new GridLayout (2,1,5,5));
>topRight.setLayout (new GridLayout (2,2,5,5));
>
>// finally - add all the top components
>topLeft.add (urlLabel);
>topLeft.add (sqlLabel);
>topCenter.add (urlText);
>topCenter.add (sqlText);
>topRight.add (connectButton);
>// topRight.add (browseButton);
>topRight.add (submitButton);
>// topRight.add (disconnectButton);
>
>// Center panel consists of two more horizontally arranged
panels
>center.setLayout (new BorderLayout(5, 5)); // give it
distinct center
>Panel centerLeft = new Panel (); // holds the tables
>Panel centerCenter = new Panel (); // holds the results
>center.add ("West", centerLeft);
>center.add ("Center", centerCenter);
>
>// Each of the center panels has a north and a center
>centerLeft.setLayout (new BorderLayout (5,5));
>centerCenter.setLayout (new BorderLayout (5,5));
>
>// finally add the center components
>centerLeft.add ("North", tableLabel);
>centerCenter.add ("North", outputLabel);
>centerLeft.add ("Center", tableList);
>centerCenter.add ("Center", rowList);
>centerCenter.add ("South", statusLabel);
>
>StringBuffer rowEntry = new StringBuffer (500);
>Properties sysProps = System.getProperties(); // get the
systen
>properties
>Enumeration propNames = sysProps.propertyNames();// get
their names
>while (propNames.hasMoreElements()) {
>String propName = (String)propNames.nextElement(); // get
next name
>rowEntry.setLength(0); // clear down buffer
>rowEntry.append (propName); // set prop name
>rowEntry.append ('=');
>try {
>rowEntry.append (System.getProperty (propName));
>} catch (Exception e) {
>rowEntry.append (e.toString());
>} // try-catch
>// rowList.add (rowEntry.toString());
>} // while
>} catch (Exception ex) {
>ex.printStackTrace();
>}
>
>cunnction();
>} // init
>
>/**
>*
>*/
>
>private String addResultstoList (ResultSet rs, List ls,
String colName) {
>StringBuffer curRow = new StringBuffer (500); // create a
bug string
>buffer
>
>try {
>ls.removeAll(); // clear out the list
>
>ResultSetMetaData rsmd = rs.getMetaData (); // get results
set info
>int numCols = rsmd.getColumnCount (); // get number of
columns
>
>while (rs.next ()) { // while more rows
>curRow.setLength (0); // clear out the buffer
>for (int i=1; i<=numCols; i++) { // for each column
>if (colName != null) { // if only one col reqd
>if (!rsmd.getColumnLabel(i).equalsIgnoreCase(colName))
>continue;
>} // if
>if (curRow.length() > 0) curRow.append("  , ");// check
for later
>columns
>curRow.append(rs.getString(i)); // add to cur row
>}
>ls.add (curRow.toString()); // add row to list
>}
>
>curRow.setLength (0); // clear out the buffer
>for (int i=1; i<=numCols; i++) { // for each column header
>if (curRow.length() > 0) curRow.append(",");// check for
comma to
>separate
>curRow.append(rsmd.getColumnLabel(i)); // and add new
column header
>}
>
>} catch (Exception e) {
>statusLabel.setText (e.toString());
>e.printStackTrace();
>} // try-catch
>return curRow.toString(); // return columns headers
>} // method addResultstoList
>
>
>public void cunnction() {
>file://changed
>
>statusLabel.setText ("Connecting...");
>
>try {
>
>con = DriverManager.getConnection (urlText.getText());
>
>DatabaseMetaData dbmd = con.getMetaData();
>
>statusLabel.setText ("Connected to "
>+dbmd.getDatabaseProductName()+" "
>+dbmd.getDatabaseProductVersion());
>ResultSet rs = dbmd.getTables (null,null,"%",null);
>addResultstoList (rs, tableList, "TABLE_NAME");
>rs.close();
>      }
>catch( Exception e) {sqlText.setText(e.toString()); }
>// return true;
>file://up to here
>} file://cunnction
>
>
>
>/**
>*
>*/
>public boolean action (Event evt, Object what) {
>try {
>if (evt.target==submitButton || evt.target==sqlText) { //
check for
>submit SQL
>
>statusLabel.setText ("Executing...");
>Statement stmt = con.createStatement ();
>if (stmt.execute(sqlText.getText())) {
>// Result set available
>ResultSet rs = stmt.getResultSet();
>String colNames = addResultstoList (rs, rowList, null);
>outputLabel.setText (colNames);
>rs.close();
>statusLabel.setText ("SQL Executed");
>} // if
>stmt.close();
>return true;
>
>} else if (evt.target==connectButton || evt.target ==
this.urlText)
>{ // check for connect
>statusLabel.setText ("Connecting...");
>System.out.println ("Connecting to "+urlText.getText());
>con = DriverManager.getConnection (urlText.getText());
>DatabaseMetaData dbmd = con.getMetaData();
>statusLabel.setText ("Connected to "
>+dbmd.getDatabaseProductName()+" "
>+dbmd.getDatabaseProductVersion());
>ResultSet rs = dbmd.getTables (null,null,"%",null);
>addResultstoList (rs, tableList, "TABLE_NAME");
>rs.close();
>return true;
>} else if (evt.target==disconnectButton) { // check for
disconnect
>if (con != null) con.close();
>con=null;
>statusLabel.setText ("Disconnected");
>} else if (evt.target==browseButton) { // check for url
browse
>if (urlBrowse==null) { // if not created yet
>urlBrowse=new FileDialog (
>(Frame)getParent(), "Select a database", FileDialog.LOAD);
>} // if
>urlBrowse.show();
>urlText.setText ("jdbc:idb:"
>+urlBrowse.getDirectory()+urlBrowse.getFile());
>} // if-else
>} catch (Exception e) {
>statusLabel.setText (e.toString());
>e.printStackTrace();
>} // try-catch
>return false;
>} // method action
>
>/**
>* Handles the list selection event.
>*/
>public boolean handleEvent (Event evt) {
>if (evt.target == tableList && // if the table list
>evt.id == Event.LIST_SELECT) { // and a select event
>sqlText.setText("SELECT * FROM
"+tableList.getSelectedItem());
>return true;
>} // if
>if (evt.target == rowList && // if the row list
>evt.id == Event.LIST_SELECT) { // and a select event
>displayText.append("\n"+rowList.getSelectedItem());
>return true;
>} // if
>return super.handleEvent (evt); // let Applet handle it
>} // method handleEvent
>
>
>/**
>*
>*/
>public void destroy () {
>try {
>if (con != null) con.close();
>} catch (Exception e) {
>statusLabel.setText (e.toString());
>e.printStackTrace();
>} // try-catch
>} // method destroy
>
>} // Class JDBCAppl
>
>
>
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