Examples of org.gdbms.engine.data.DataSource.start()

org.gdbms.engine.data.DataSource.start()
Opens the DataSource to access the data it contains. If the data is accessed without a previous opening a ClosedDataSourceException is thrown. If this method is invoked twice then only the second call to stop will close the DataSource.
If the DataSource was obtained with an AUTOMATIC_OPENING mode, there's no need to open the DataSource. Indeed start calls are ignored. It's possible to close the DataSource by a single call to the close method @throws DriverException if the operation fails

    
    public void testDistinctAllFields() throws Exception {
        DataSource d = ds.executeSQL(
                "select distinct * from sort ;");
        
        d.start();
        assertTrue(d.getRowCount() == 4);
        assertTrue(((BooleanValue)d.getFieldValue(0, 0).equals(ValueFactory.createValue(0))).getValue());
        assertTrue(((BooleanValue)d.getFieldValue(0, 1).equals(ValueFactory.createValue(1))).getValue());
        assertTrue(((BooleanValue)d.getFieldValue(1, 0).equals(ValueFactory.createValue(0))).getValue());
        assertTrue(((BooleanValue)d.getFieldValue(1, 1).equals(ValueFactory.createValue(3))).getValue());

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     * @throws DriverLoadException 
     */
    private void doTestNullValues(String dsName)
        throws NoSuchTableException, DriverException, DriverLoadException, DataSourceCreationException {
        DataSource d = ds.getDataSource(dsName);
        d.start();


        for (int i = 0; i < d.getRowCount(); i++) {
            for (int j = 0; j < d.getDataSourceMetadata().getFieldCount(); j++) {
                assertTrue(d.getFieldValue(i, j) != null);
                assertFalse(d.getFieldValue(i, j).toString().equals("'null'"));

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     *
     * @throws Throwable DOCUMENT ME!
     */
    public void testUnion() throws Throwable {
      DataSource d = ds.executeSQL("(select id, nombre, apellido from persona) union (select  id, nombre, apellido from persona);");
      d.start();
      String aux = d.getAsString();
      d.stop();
    
      FileInputStream fis = new FileInputStream("src/test/resources/union.txt");
      byte[] correcto = new byte[aux.getBytes().length];

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     * @throws Throwable DOCUMENT ME!
     */
    public void testSelect() throws Throwable {
      DataSource d = ds.executeSQL("select apellido from persona where nombre='fernando';");
    
      d.start();
      String aux = d.getAsString();
      d.stop();
    
      FileInputStream fis = new FileInputStream("src/test/resources/select.txt");
      byte[] correcto = new byte[aux.getBytes().length];

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