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<?php
/**
* $Header$
* $Horde: horde/lib/Log/sql.php,v 1.12 2000/08/16 20:27:34 chuck Exp $
*
* @version $Revision$
* @package Log
*/
/**
* We require the PEAR DB class. This is generally defined in the DB.php file,
* but it's possible that the caller may have provided the DB class, or a
* compatible wrapper (such as the one shipped with MDB2), so we first check
* for an existing 'DB' class before including 'DB.php'.
*/
if (!class_exists('DB')) {
require_once 'DB.php';
}
/**
* The Log_sql class is a concrete implementation of the Log::
* abstract class which sends messages to an SQL server. Each entry
* occupies a separate row in the database.
*
* This implementation uses PHP's PEAR database abstraction layer.
*
* CREATE TABLE log_table (
* id INT NOT NULL,
* logtime TIMESTAMP NOT NULL,
* ident CHAR(16) NOT NULL,
* priority INT NOT NULL,
* message VARCHAR(200),
* PRIMARY KEY (id)
* );
*
* @author Jon Parise <jon@php.net>
* @since Horde 1.3
* @since Log 1.0
* @package Log
*
* @example sql.php Using the SQL handler.
*/
class Log_sql extends Log
{
/**
* Variable containing the DSN information.
* @var mixed
* @access private
*/
var $_dsn = '';
/**
* String containing the SQL insertion statement.
*
* @var string
* @access private
*/
var $_sql = '';
/**
* Array containing our set of DB configuration options.
* @var array
* @access private
*/
var $_options = array('persistent' => true);
/**
* Object holding the database handle.
* @var object
* @access private
*/
var $_db = null;
/**
* Resource holding the prepared statement handle.
* @var resource
* @access private
*/
var $_statement = 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';
/**
* String holding the name of the ID sequence.
* @var string
* @access private
*/
var $_sequence = 'log_id';
/**
* Maximum length of the $ident string. This corresponds to the size of
* the 'ident' column in the SQL table.
* @var integer
* @access private
*/
var $_identLimit = 16;
/**
* Constructs a new sql logging object.
*
* @param string $name The target SQL table.
* @param string $ident The identification field.
* @param array $conf The connection configuration array.
* @param int $level Log messages up to and including this level.
* @access public
*/
public function __construct($name, $ident = '', $conf = array(),
$level = PEAR_LOG_DEBUG)
{
$this->_id = md5(microtime().rand());
$this->_table = $name;
$this->_mask = Log::UPTO($level);
/* Now that we have a table name, assign our SQL statement. */
if (!empty($conf['sql'])) {
$this->_sql = $conf['sql'];
} else {
$this->_sql = 'INSERT INTO ' . $this->_table .
' (id, logtime, ident, priority, message)' .
' VALUES(?, CURRENT_TIMESTAMP, ?, ?, ?)';
}
/* If an options array was provided, use it. */
if (isset($conf['options']) && is_array($conf['options'])) {
$this->_options = $conf['options'];
}
/* If a specific sequence name was provided, use it. */
if (!empty($conf['sequence'])) {
$this->_sequence = $conf['sequence'];
}
/* If a specific sequence name was provided, use it. */
if (isset($conf['identLimit'])) {
$this->_identLimit = $conf['identLimit'];
}
/* Now that the ident limit is confirmed, set the ident string. */
$this->setIdent($ident);
/* If an existing database connection was provided, use it. */
if (isset($conf['db'])) {
$this->_db = &$conf['db'];
$this->_existingConnection = true;
$this->_opened = true;
} else {
$this->_dsn = $conf['dsn'];
}
}
/**
* Opens a connection to the database, if it has not already
* been opened. This is implicitly called by log(), if necessary.
*
* @return boolean True on success, false on failure.
* @access public
*/
function open()
{
if (!$this->_opened) {
/* Use the DSN and options to create a database connection. */
$this->_db = &DB::connect($this->_dsn, $this->_options);
if (DB::isError($this->_db)) {
return false;
}
/* Create a prepared statement for repeated use in log(). */
if (!$this->_prepareStatement()) {
return false;
}
/* We now consider out connection open. */
$this->_opened = true;
}
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 $conf['db'].
*
* @return boolean True on success, false on failure.
* @access public
*/
function close()
{
if ($this->_opened && !$this->_existingConnection) {
$this->_opened = false;
$this->_db->freePrepared($this->_statement);
return $this->_db->disconnect();
}
return ($this->_opened === false);
}
/**
* Sets this Log instance's identification string. Note that this
* SQL-specific implementation will limit the length of the $ident string
* to sixteen (16) characters.
*
* @param string $ident The new identification string.
*
* @access public
* @since Log 1.8.5
*/
function setIdent($ident)
{
$this->_ident = substr($ident, 0, $this->_identLimit);
}
/**
* 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 && !$this->open()) {
return false;
}
/* If we don't already have our statement object yet, create it. */
if (!is_object($this->_statement) && !$this->_prepareStatement()) {
return false;
}
/* Extract the string representation of the message. */
$message = $this->_extractMessage($message);
/* Build our set of values for this log entry. */
$id = $this->_db->nextId($this->_sequence);
$values = array($id, $this->_ident, $priority, $message);
/* Execute the SQL query for this log entry insertion. */
$result =& $this->_db->execute($this->_statement, $values);
if (DB::isError($result)) {
return false;
}
$this->_announce(array('priority' => $priority, 'message' => $message));
return true;
}
/**
* Prepare the SQL insertion statement.
*
* @return boolean True if the statement was successfully created.
*
* @access private
* @since Log 1.9.1
*/
function _prepareStatement()
{
$this->_statement = $this->_db->prepare($this->_sql);
/* Return success if we didn't generate an error. */
return (DB::isError($this->_statement) === false);
}
}
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