Method start

src/java/simpledb/Parser.java:593–688

(String[] argv)

    protected boolean interactive = true;

    protected void start(String[] argv) throws IOException {
        // first add tables to database
        Database.getCatalog().loadSchema(argv[0]);
        TableStats.computeStatistics();

        String queryFile = null;

        if (argv.length > 1) {
            for (int i = 1; i < argv.length; i++) {
                if (argv[i].equals("-explain")) {
                    explain = true;
                    System.out.println("Explain mode enabled.");
                } else if (argv[i].equals("-f")) {
                    interactive = false;
                    if (i++ == argv.length) {
                        System.out.println("Expected file name after -f\n"
                                + usage);
                        System.exit(0);
                    }
                    queryFile = argv[i];

                } else {
                    System.out.println("Unknown argument " + argv[i] + "\n "
                            + usage);
                }
            }
        }
        if (!interactive) {
            try {
                // curtrans = new Transaction();
                // curtrans.start();
                try {
                    Thread.sleep(SLEEP_TIME);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                long startTime = System.currentTimeMillis();
                processNextStatement(new FileInputStream(queryFile));
                long time = System.currentTimeMillis() - startTime;
                System.out.printf("----------------\n%.2f seconds\n\n",
                        ((double) time / 1000.0));
                System.out.println("Press Enter to exit");
                System.in.read();
                this.shutdown();
            } catch (FileNotFoundException e) {
                System.out.println("Unable to find query file" + queryFile);
                e.printStackTrace();
            }
        } else { // no query file, run interactive prompt
            ConsoleReader reader = new ConsoleReader();

            // Add really stupid tab completion for simple SQL
            ArgumentCompletor completor = new ArgumentCompletor(
                    new SimpleCompletor(SQL_COMMANDS));
            completor.setStrict(false); // match at any position
            reader.addCompletor(completor);