/**
* Queries a database to load results from the specified table name. The database connection must
* have already made by m_InstanceQuery.
*
* @param tableName the name of the table containing results to retrieve.
*/
protected void setInstancesFromDatabaseTable(String tableName) {
try {
m_FromLab.setText("Reading from database, please wait...");
final Instances i = m_InstanceQuery.retrieveInstances("SELECT * FROM " + tableName);
SwingUtilities.invokeAndWait(
new Runnable() {
public void run() {
setInstances(i);
}
});
m_InstanceQuery.disconnectFromDatabase();
} catch (Exception ex) {
m_FromLab.setText(ex.getMessage());
}
}
/**
* Test the class from the command line. The instance query should be specified with -Q sql_query
*
* @param args contains options for the instance query
*/
public static void main(String args[]) {
try {
InstanceQuery iq = new InstanceQuery();
String query = Utils.getOption('Q', args);
if (query.length() == 0) {
iq.setQuery("select * from Experiment_index");
} else {
iq.setQuery(query);
}
iq.setOptions(args);
try {
Utils.checkForRemainingOptions(args);
} catch (Exception e) {
System.err.println("Options for weka.experiment.InstanceQuery:\n");
Enumeration en = iq.listOptions();
while (en.hasMoreElements()) {
Option o = (Option) en.nextElement();
System.err.println(o.synopsis() + "\n" + o.description());
}
System.exit(1);
}
Instances aha = iq.retrieveInstances();
iq.disconnectFromDatabase();
// query returned no result -> exit
if (aha == null) return;
// The dataset may be large, so to make things easier we'll
// output an instance at a time (rather than having to convert
// the entire dataset to one large string)
System.out.println(new Instances(aha, 0));
for (int i = 0; i < aha.numInstances(); i++) {
System.out.println(aha.instance(i));
}
} catch (Exception e) {
e.printStackTrace();
System.err.println(e.getMessage());
}
}
/** Queries the user enough to make a database query to retrieve experiment results. */
protected void setInstancesFromDBaseQuery() {
try {
if (m_InstanceQuery == null) {
m_InstanceQuery = new InstanceQuery();
}
String dbaseURL = m_InstanceQuery.getDatabaseURL();
String username = m_InstanceQuery.getUsername();
String passwd = m_InstanceQuery.getPassword();
/*dbaseURL = (String) JOptionPane.showInputDialog(this,
"Enter the database URL",
"Query Database",
JOptionPane.PLAIN_MESSAGE,
null,
null,
dbaseURL);*/
DatabaseConnectionDialog dbd = new DatabaseConnectionDialog(null, dbaseURL, username);
dbd.setVisible(true);
// if (dbaseURL == null) {
if (dbd.getReturnValue() == JOptionPane.CLOSED_OPTION) {
m_FromLab.setText("Cancelled");
return;
}
dbaseURL = dbd.getURL();
username = dbd.getUsername();
passwd = dbd.getPassword();
m_InstanceQuery.setDatabaseURL(dbaseURL);
m_InstanceQuery.setUsername(username);
m_InstanceQuery.setPassword(passwd);
m_InstanceQuery.setDebug(dbd.getDebug());
m_InstanceQuery.connectToDatabase();
if (!m_InstanceQuery.experimentIndexExists()) {
System.err.println("not found");
m_FromLab.setText("No experiment index");
m_InstanceQuery.disconnectFromDatabase();
return;
}
System.err.println("found");
m_FromLab.setText("Getting experiment index");
Instances index =
m_InstanceQuery.retrieveInstances("SELECT * FROM " + InstanceQuery.EXP_INDEX_TABLE);
if (index.numInstances() == 0) {
m_FromLab.setText("No experiments available");
m_InstanceQuery.disconnectFromDatabase();
return;
}
m_FromLab.setText("Got experiment index");
DefaultListModel lm = new DefaultListModel();
for (int i = 0; i < index.numInstances(); i++) {
lm.addElement(index.instance(i).toString());
}
JList jl = new JList(lm);
jl.setSelectedIndex(0);
int result;
// display dialog only if there's not just one result!
if (jl.getModel().getSize() != 1) {
ListSelectorDialog jd = new ListSelectorDialog(null, jl);
result = jd.showDialog();
} else {
result = ListSelectorDialog.APPROVE_OPTION;
}
if (result != ListSelectorDialog.APPROVE_OPTION) {
m_FromLab.setText("Cancelled");
m_InstanceQuery.disconnectFromDatabase();
return;
}
Instance selInst = index.instance(jl.getSelectedIndex());
Attribute tableAttr = index.attribute(InstanceQuery.EXP_RESULT_COL);
String table = InstanceQuery.EXP_RESULT_PREFIX + selInst.toString(tableAttr);
setInstancesFromDatabaseTable(table);
} catch (Exception ex) {
// 1. print complete stacktrace
ex.printStackTrace();
// 2. print message in panel
m_FromLab.setText("Problem reading database: '" + ex.getMessage() + "'");
}
}