<?php
// Create a new Db4 Instance
$db = new Db4();
// Open it outside a Db4Env environment with datafile db4
// and database name "test." This creates a non-transactional database
$db->open(null, "./db4", "test");
// Get the current value of "counter"
$counter = $db->get("counter");
print "Counter Value is {$counter}\n";
// Increment $counter and put() it.
$db->put("counter", $counter + 1);
// Sync to be certain, since we're leaving the handle open
$db->sync();
<?php
// Open a new Db4Env
$dbenv = new Db4Env();
$dbenv->set_data_dir("/var/tmp/dbhome");
$dbenv->open("/var/tmp/dbhome");
// Open a database in $dbenv. Note that even though
// we pass null in as the transaction, db4 forces this
// operation to be transactionally protected, so PHP
// will force auto-commit internally.
$db = new Db4($dbenv);
$db->open(null, 'a', 'foo');
$counter = $db->get("counter");
// Create a new transaction
$txn = $dbenv->txn_begin();
if ($txn == false) {
print "txn_begin failed";
exit;
}
print "Current value of counter is {$counter}\n";
// Increment and reset counter, protect it with $txn
$db->put("counter", $counter + 1, $txn);
// Commit the transaction, otherwise the above put() will rollback.
$txn->commit();
// Sync for good measure
$db->sync();
// This isn't a real close, use _close() for that.
$db->close();
<?php
// Create a new Db4 Instance
$db = new Db4();
// Open it outside a Db4Env environment with datafile /var/lib/db4
// and database name "test." This creates a non-transactional database
$db->open(null, "/var/tmp/db4", "test");
// Get the current value of "counter"
$counter = $db->get("counter");
print "Counter Value is {$counter}\n";
// Increment $counter and put() it.
$db->put("counter", $counter + 1);
// Sync to be certain, since we're leaving the handle open
$db->sync();
<?php
// Open a new Db4Env. By default it is transactional. The directory
// path in the open() call must exist.
$dbenv = new Db4Env();
$dbenv->set_data_dir("/var/tmp/dbhome");
$dbenv->open("/var/tmp/dbhome");
// Open a database in $dbenv.
$db = new Db4($dbenv);
$txn = $dbenv->txn_begin();
$db->open($txn, 'a', 'foo');
$txn->commit();
$counter = $db->get("counter");
// Create a new transaction
$txn = $dbenv->txn_begin();
if ($txn == false) {
print "txn_begin failed";
exit;
}
print "Current value of counter is {$counter}\n";
// Increment and reset counter, protect it with $txn
$db->put("counter", $counter + 1, $txn);
// Commit the transaction, otherwise the above put() will rollback.
$txn->commit();
// Sync for good measure
$db->sync();
// This isn't a real close, use _close() for that.
$db->close();
session_start();
if (empty($_SESSION['count'])) {
$_SESSION['count'] = 1;
} else {
$_SESSION['count']++;
}
$request_method = $_ENV['REQUEST_METHOD'];
$request_uri = substr($_ENV['REQUEST_URI'], 1);
$content_length = $_ENV['CONTENT_LENGTH'];
$filename = "database";
$db = new Db4();
if ($request_method === 'GET') {
if (!empty($_SESSION[$request_uri])) {
echo $_SESSION[$request_uri];
} else {
$db->open(NULL, $filename, NULL);
$val = $db->get($request_uri);
echo $val;
}
} else {
if ($request_method === 'PUT') {
$buffer = file_get_contents('php://input');
$_SESSION[$request_uri] = $buffer;
} else {
if ($request_method === 'DELETE') {
unset($_SESSION[$request_uri]);
$db->open(NULL, $filename, NULL);
$db->del($request_uri);
}
}
}