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<?php
/**
* $Header: /repository/pear/Log/Log/sqlite.php,v 1.5 2005/12/05 05:38:31 jon Exp $
*
* @version $Revision: 1.5 $
* @package Log
*/
/**
* The Log_sqlite class is a concrete implementation of the Log::
* abstract class which sends messages to an Sqlite database.
* Each entry occupies a separate row in the database.
*
* This implementation uses PHP native Sqlite functions.
*
* CREATE TABLE log_table (
* id INTEGER PRIMARY KEY NOT NULL,
* logtime NOT NULL,
* ident CHAR(16) NOT NULL,
* priority INT NOT NULL,
* message
* );
*
* @author Bertrand Mansion <bmansion@mamasam.com>
* @author Jon Parise <jon@php.net>
* @since Log 1.8.3
* @package Log
*
* @example sqlite.php Using the Sqlite handler.
*/
class Log_sqlite extends Log
{
/**
* Array containing the connection defaults
* @var array
* @access private
*/
var $_options = array('mode' => 0666,
'persistent' => false);
/**
* Object holding the database handle.
* @var object
* @access private
*/
var $_db = null;
/**
* Flag indicating that we're using an existing database connection.
* @var boolean
* @access private
*/
var $_existingConnection = false;
/**
* String holding the database table to use.
* @var string
* @access private
*/
var $_table = 'log_table';
/**
* Constructs a new sql logging object.
*
* @param string $name The target SQL table.
* @param string $ident The identification field.
* @param mixed $conf Can be an array of configuration options used
* to open a new database connection
* or an already opened sqlite connection.
* @param int $level Log messages up to and including this level.
* @access public
*/
function Log_sqlite($name, $ident = '', &$conf, $level = PEAR_LOG_DEBUG)
{
$this->_id = md5(microtime());
$this->_table = $name;
$this->_ident = $ident;
$this->_mask = Log::UPTO($level);
if (is_array($conf)) {
foreach ($conf as $k => $opt) {
$this->_options[$k] = $opt;
}
} else {
// If an existing database connection was provided, use it.
$this->_db =& $conf;
$this->_existingConnection = true;
}
}
/**
* Opens a connection to the database, if it has not already
* been opened. This is implicitly called by log(), if necessary.
*
* @return boolean True on success, false on failure.
* @access public
*/
function open()
{
if (is_resource($this->_db)) {
$this->_opened = true;
return $this->_createTable();
} else {
/* Set the connection function based on the 'persistent' option. */
if (empty($this->_options['persistent'])) {
$connectFunction = 'sqlite_open';
} else {
$connectFunction = 'sqlite_popen';
}
/* Attempt to connect to the database. */
if ($this->_db = $connectFunction($this->_options['filename'],
(int)$this->_options['mode'],
$error)) {
$this->_opened = true;
return $this->_createTable();
}
}
return $this->_opened;
}
/**
* Closes the connection to the database if it is still open and we were
* the ones that opened it. It is the caller's responsible to close an
* existing connection that was passed to us via $conf['db'].
*
* @return boolean True on success, false on failure.
* @access public
*/
function close()
{
/* We never close existing connections. */
if ($this->_existingConnection) {
return false;
}
if ($this->_opened) {
$this->_opened = false;
sqlite_close($this->_db);
}
return ($this->_opened === false);
}
/**
* Inserts $message to the currently open database. Calls open(),
* if necessary. Also passes the message along to any Log_observer
* instances that are observing this Log.
*
* @param mixed $message String or object containing the message to log.
* @param string $priority The priority of the message. Valid
* values are: PEAR_LOG_EMERG, PEAR_LOG_ALERT,
* PEAR_LOG_CRIT, PEAR_LOG_ERR, PEAR_LOG_WARNING,
* PEAR_LOG_NOTICE, PEAR_LOG_INFO, and PEAR_LOG_DEBUG.
* @return boolean True on success or false on failure.
* @access public
*/
function log($message, $priority = null)
{
/* If a priority hasn't been specified, use the default value. */
if ($priority === null) {
$priority = $this->_priority;
}
/* Abort early if the priority is above the maximum logging level. */
if (!$this->_isMasked($priority)) {
return false;
}
/* If the connection isn't open and can't be opened, return failure. */
if (!$this->_opened && !$this->open()) {
return false;
}
// Extract the string representation of the message.
$message = $this->_extractMessage($message);
// Build the SQL query for this log entry insertion.
$q = sprintf('INSERT INTO [%s] (logtime, ident, priority, message) ' .
"VALUES ('%s', '%s', %d, '%s')",
$this->_table,
strftime('%Y-%m-%d %H:%M:%S', time()),
sqlite_escape_string($this->_ident),
$priority,
sqlite_escape_string($message));
if (!($res = @sqlite_unbuffered_query($this->_db, $q))) {
return false;
}
$this->_announce(array('priority' => $priority, 'message' => $message));
return true;
}
/**
* Checks whether the log table exists and creates it if necessary.
*
* @return boolean True on success or false on failure.
* @access private
*/
function _createTable()
{
$q = "SELECT name FROM sqlite_master WHERE name='" . $this->_table .
"' AND type='table'";
$res = sqlite_query($this->_db, $q);
if (sqlite_num_rows($res) == 0) {
$q = 'CREATE TABLE [' . $this->_table . '] (' .
'id INTEGER PRIMARY KEY NOT NULL, ' .
'logtime NOT NULL, ' .
'ident CHAR(16) NOT NULL, ' .
'priority INT NOT NULL, ' .
'message)';
if (!($res = sqlite_unbuffered_query($this->_db, $q))) {
return false;
}
}
return true;
}
}
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