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<?php
/**
* $Header: /repository/pear/Log/Log/mdb2.php,v 1.5 2006/01/08 03:35:44 jon Exp $
*
* @version $Revision: 1.5 $
* @package Log
*/
/** PEAR's MDB2 package */
require_once 'MDB2.php';
MDB2::loadFile('Date');
/**
* The Log_mdb2 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 PEAR's MDB2 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 Lukas Smith <smith@backendmedia.com>
* @author Jon Parise <jon@php.net>
* @since Log 1.9.0
* @package Log
*/
class Log_mdb2 extends Log
{
/**
* Variable containing the DSN information.
* @var mixed
* @access private
*/
var $_dsn = '';
/**
* 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;
/**
* Set of field types used in the database table.
* @var array
* @access private
*/
var $_types = array(
'id' => 'integer',
'logtime' => 'timestamp',
'ident' => 'text',
'priority' => 'text',
'message' => 'clob'
);
/**
* 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 $level Log messages up to and including this level.
* @access public
*/
function Log_mdb2($name, $ident = '', $conf = array(),
$level = PEAR_LOG_DEBUG)
{
$this->_id = md5(microtime());
$this->_table = $name;
$this->_mask = Log::UPTO($level);
/* 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;
$this->_opened = true;
} elseif (isset($conf['singleton'])) {
$this->_db = &MDB2::singleton($conf['singleton'], $this->_options);
$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. */
$this->_db = &MDB2::connect($this->_dsn, $this->_options);
if (PEAR::isError($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 $conf['db'].
*
* @return boolean True on success, false on failure.
* @access public
*/
function close()
{
/* If we have a statement object, free it. */
if (is_object($this->_statement)) {
$this->_statement->free();
$this->_statement = null;
}
/* If we opened the database connection, disconnect it. */
if ($this->_opened && !$this->_existingConnection) {
$this->_opened = false;
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 && !$this->open()) {
return false;
}
/* If we don't already have a statement object, create one. */
if (!is_object($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. */
$values = array(
'id' => $this->_db->nextId($this->_sequence),
'logtime' => MDB2_Date::mdbNow(),
'ident' => $this->_ident,
'priority' => $priority,
'message' => $message
);
/* Execute the SQL query for this log entry insertion. */
$this->_db->expectError(MDB2_ERROR_NOSUCHTABLE);
$result = &$this->_statement->execute($values);
$this->_db->popExpect();
/* Attempt to handle any errors. */
if (PEAR::isError($result)) {
/* We can only handle MDB2_ERROR_NOSUCHTABLE errors. */
if ($result->getCode() != MDB2_ERROR_NOSUCHTABLE) {
return false;
}
/* Attempt to create the target table. */
if (!$this->_createTable()) {
return false;
}
/* Recreate our prepared statement resource. */
$this->_statement->free();
if (!$this->_prepareStatement()) {
return false;
}
/* Attempt to re-execute the insertion query. */
$result = $this->_statement->execute($values);
if (PEAR::isError($result)) {
return false;
}
}
$this->_announce(array('priority' => $priority, 'message' => $message));
return true;
}
/**
* Create the log table in the database.
*
* @return boolean True on success or false on failure.
* @access private
*/
function _createTable()
{
$this->_db->loadModule('Manager', null, true);
$result = $this->_db->manager->createTable(
$this->_table,
array(
'id' => array('type' => $this->_types['id']),
'logtime' => array('type' => $this->_types['logtime']),
'ident' => array('type' => $this->_types['ident']),
'priority' => array('type' => $this->_types['priority']),
'message' => array('type' => $this->_types['message'])
)
);
if (PEAR::isError($result)) {
return false;
}
$result = $this->_db->manager->createIndex(
$this->_table,
'unique_id',
array('fields' => array('id' => true), 'unique' => true)
);
if (PEAR::isError($result)) {
return false;
}
return true;
}
/**
* Prepare the SQL insertion statement.
*
* @return boolean True if the statement was successfully created.
*
* @access private
* @since Log 1.9.0
*/
function _prepareStatement()
{
$this->_statement = &$this->_db->prepare(
'INSERT INTO ' . $this->_table .
' (id, logtime, ident, priority, message)' .
' VALUES(:id, :logtime, :ident, :priority, :message)',
$this->_types, MDB2_PREPARE_MANIP);
/* Return success if we didn't generate an error. */
return (PEAR::isError($this->_statement) === false);
}
}
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