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authorFlorian Pritz <bluewind@xinu.at>2017-09-09 16:05:22 +0200
committerFlorian Pritz <bluewind@xinu.at>2017-09-09 16:05:22 +0200
commit27639d64d06b62f237bbde253c46cd28fdce8884 (patch)
tree7a2f00cfd44cfcdfe6cb1abc1cfc0675632948c4 /system/database/DB_driver.php
parent9c5bfbee5b42ea50a5611c537b8dbf01d7a64f79 (diff)
parent6c7a4266410070d30f8f6bcdf9c9e67f3d6478e3 (diff)
Merge tag '3.1.5' into dev-ci3
Signed-off-by: Florian Pritz <bluewind@xinu.at>
Diffstat (limited to 'system/database/DB_driver.php')
-rw-r--r--system/database/DB_driver.php1676
1 files changed, 1126 insertions, 550 deletions
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index c342aacbd..3eb51f734 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -1,19 +1,41 @@
-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php
/**
* CodeIgniter
*
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP
*
- * @package CodeIgniter
- * @author ExpressionEngine Dev Team
- * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc.
- * @license http://codeigniter.com/user_guide/license.html
- * @link http://codeigniter.com
- * @since Version 1.0
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2017, British Columbia Institute of Technology
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @package CodeIgniter
+ * @author EllisLab Dev Team
+ * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
+ * @copyright Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
+ * @license http://opensource.org/licenses/MIT MIT License
+ * @link https://codeigniter.com
+ * @since Version 1.0.0
* @filesource
*/
-
-// ------------------------------------------------------------------------
+defined('BASEPATH') OR exit('No direct script access allowed');
/**
* Database Driver Class
@@ -25,60 +47,322 @@
* @package CodeIgniter
* @subpackage Drivers
* @category Database
- * @author ExpressionEngine Dev Team
- * @link http://codeigniter.com/user_guide/database/
+ * @author EllisLab Dev Team
+ * @link https://codeigniter.com/user_guide/database/
*/
-class CI_DB_driver {
-
- var $username;
- var $password;
- var $hostname;
- var $database;
- var $dbdriver = 'mysql';
- var $dbprefix = '';
- var $char_set = 'utf8';
- var $dbcollat = 'utf8_general_ci';
- var $autoinit = TRUE; // Whether to automatically initialize the DB
- var $swap_pre = '';
- var $port = '';
- var $pconnect = FALSE;
- var $conn_id = FALSE;
- var $result_id = FALSE;
- var $db_debug = FALSE;
- var $benchmark = 0;
- var $query_count = 0;
- var $bind_marker = '?';
- var $save_queries = TRUE;
- var $queries = array();
- var $query_times = array();
- var $data_cache = array();
- var $trans_enabled = TRUE;
- var $trans_strict = TRUE;
- var $_trans_depth = 0;
- var $_trans_status = TRUE; // Used with transactions to determine if a rollback should occur
- var $cache_on = FALSE;
- var $cachedir = '';
- var $cache_autodel = FALSE;
- var $CACHE; // The cache class object
-
- // Private variables
- var $_protect_identifiers = TRUE;
- var $_reserved_identifiers = array('*'); // Identifiers that should NOT be escaped
-
- // These are use with Oracle
- var $stmt_id;
- var $curs_id;
- var $limit_used;
-
-
-
- /**
- * Constructor. Accepts one parameter containing the database
- * connection settings.
- *
- * @param array
- */
- function __construct($params)
+abstract class CI_DB_driver {
+
+ /**
+ * Data Source Name / Connect string
+ *
+ * @var string
+ */
+ public $dsn;
+
+ /**
+ * Username
+ *
+ * @var string
+ */
+ public $username;
+
+ /**
+ * Password
+ *
+ * @var string
+ */
+ public $password;
+
+ /**
+ * Hostname
+ *
+ * @var string
+ */
+ public $hostname;
+
+ /**
+ * Database name
+ *
+ * @var string
+ */
+ public $database;
+
+ /**
+ * Database driver
+ *
+ * @var string
+ */
+ public $dbdriver = 'mysqli';
+
+ /**
+ * Sub-driver
+ *
+ * @used-by CI_DB_pdo_driver
+ * @var string
+ */
+ public $subdriver;
+
+ /**
+ * Table prefix
+ *
+ * @var string
+ */
+ public $dbprefix = '';
+
+ /**
+ * Character set
+ *
+ * @var string
+ */
+ public $char_set = 'utf8';
+
+ /**
+ * Collation
+ *
+ * @var string
+ */
+ public $dbcollat = 'utf8_general_ci';
+
+ /**
+ * Encryption flag/data
+ *
+ * @var mixed
+ */
+ public $encrypt = FALSE;
+
+ /**
+ * Swap Prefix
+ *
+ * @var string
+ */
+ public $swap_pre = '';
+
+ /**
+ * Database port
+ *
+ * @var int
+ */
+ public $port = '';
+
+ /**
+ * Persistent connection flag
+ *
+ * @var bool
+ */
+ public $pconnect = FALSE;
+
+ /**
+ * Connection ID
+ *
+ * @var object|resource
+ */
+ public $conn_id = FALSE;
+
+ /**
+ * Result ID
+ *
+ * @var object|resource
+ */
+ public $result_id = FALSE;
+
+ /**
+ * Debug flag
+ *
+ * Whether to display error messages.
+ *
+ * @var bool
+ */
+ public $db_debug = FALSE;
+
+ /**
+ * Benchmark time
+ *
+ * @var int
+ */
+ public $benchmark = 0;
+
+ /**
+ * Executed queries count
+ *
+ * @var int
+ */
+ public $query_count = 0;
+
+ /**
+ * Bind marker
+ *
+ * Character used to identify values in a prepared statement.
+ *
+ * @var string
+ */
+ public $bind_marker = '?';
+
+ /**
+ * Save queries flag
+ *
+ * Whether to keep an in-memory history of queries for debugging purposes.
+ *
+ * @var bool
+ */
+ public $save_queries = TRUE;
+
+ /**
+ * Queries list
+ *
+ * @see CI_DB_driver::$save_queries
+ * @var string[]
+ */
+ public $queries = array();
+
+ /**
+ * Query times
+ *
+ * A list of times that queries took to execute.
+ *
+ * @var array
+ */
+ public $query_times = array();
+
+ /**
+ * Data cache
+ *
+ * An internal generic value cache.
+ *
+ * @var array
+ */
+ public $data_cache = array();
+
+ /**
+ * Transaction enabled flag
+ *
+ * @var bool
+ */
+ public $trans_enabled = TRUE;
+
+ /**
+ * Strict transaction mode flag
+ *
+ * @var bool
+ */
+ public $trans_strict = TRUE;
+
+ /**
+ * Transaction depth level
+ *
+ * @var int
+ */
+ protected $_trans_depth = 0;
+
+ /**
+ * Transaction status flag
+ *
+ * Used with transactions to determine if a rollback should occur.
+ *
+ * @var bool
+ */
+ protected $_trans_status = TRUE;
+
+ /**
+ * Transaction failure flag
+ *
+ * Used with transactions to determine if a transaction has failed.
+ *
+ * @var bool
+ */
+ protected $_trans_failure = FALSE;
+
+ /**
+ * Cache On flag
+ *
+ * @var bool
+ */
+ public $cache_on = FALSE;
+
+ /**
+ * Cache directory path
+ *
+ * @var bool
+ */
+ public $cachedir = '';
+
+ /**
+ * Cache auto-delete flag
+ *
+ * @var bool
+ */
+ public $cache_autodel = FALSE;
+
+ /**
+ * DB Cache object
+ *
+ * @see CI_DB_cache
+ * @var object
+ */
+ public $CACHE;
+
+ /**
+ * Protect identifiers flag
+ *
+ * @var bool
+ */
+ protected $_protect_identifiers = TRUE;
+
+ /**
+ * List of reserved identifiers
+ *
+ * Identifiers that must NOT be escaped.
+ *
+ * @var string[]
+ */
+ protected $_reserved_identifiers = array('*');
+
+ /**
+ * Identifier escape character
+ *
+ * @var string
+ */
+ protected $_escape_char = '"';
+
+ /**
+ * ESCAPE statement string
+ *
+ * @var string
+ */
+ protected $_like_escape_str = " ESCAPE '%s' ";
+
+ /**
+ * ESCAPE character
+ *
+ * @var string
+ */
+ protected $_like_escape_chr = '!';
+
+ /**
+ * ORDER BY random keyword
+ *
+ * @var array
+ */
+ protected $_random_keyword = array('RAND()', 'RAND(%d)');
+
+ /**
+ * COUNT string
+ *
+ * @used-by CI_DB_driver::count_all()
+ * @used-by CI_DB_query_builder::count_all_results()
+ *
+ * @var string
+ */
+ protected $_count_string = 'SELECT COUNT(*) AS ';
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Class constructor
+ *
+ * @param array $params
+ * @return void
+ */
+ public function __construct($params)
{
if (is_array($params))
{
@@ -88,7 +372,7 @@ class CI_DB_driver {
}
}
- log_message('debug', 'Database Driver Class Initialized');
+ log_message('info', 'Database Driver Class Initialized');
}
// --------------------------------------------------------------------
@@ -96,15 +380,17 @@ class CI_DB_driver {
/**
* Initialize Database Settings
*
- * @access private Called by the constructor
- * @param mixed
- * @return void
+ * @return bool
*/
- function initialize()
+ public function initialize()
{
- // If an existing connection resource is available
- // there is no need to connect and select the database
- if (is_resource($this->conn_id) OR is_object($this->conn_id))
+ /* If an established connection is available, then there's
+ * no need to connect and select the database.
+ *
+ * Depending on the database driver, conn_id can be either
+ * boolean TRUE, a resource or an object.
+ */
+ if ($this->conn_id)
{
return TRUE;
}
@@ -112,69 +398,139 @@ class CI_DB_driver {
// ----------------------------------------------------------------
// Connect to the database and set the connection ID
- $this->conn_id = ($this->pconnect == FALSE) ? $this->db_connect() : $this->db_pconnect();
+ $this->conn_id = $this->db_connect($this->pconnect);
- // No connection resource? Throw an error
+ // No connection resource? Check if there is a failover else throw an error
if ( ! $this->conn_id)
{
- log_message('error', 'Unable to connect to the database');
-
- if ($this->db_debug)
+ // Check if there is a failover set
+ if ( ! empty($this->failover) && is_array($this->failover))
{
- $this->display_error('db_unable_to_connect');
- }
- return FALSE;
- }
+ // Go over all the failovers
+ foreach ($this->failover as $failover)
+ {
+ // Replace the current settings with those of the failover
+ foreach ($failover as $key => $val)
+ {
+ $this->$key = $val;
+ }
- // ----------------------------------------------------------------
+ // Try to connect
+ $this->conn_id = $this->db_connect($this->pconnect);
- // Select the DB... assuming a database name is specified in the config file
- if ($this->database != '')
- {
- if ( ! $this->db_select())
- {
- log_message('error', 'Unable to select database: '.$this->database);
-
- if ($this->db_debug)
- {
- $this->display_error('db_unable_to_select', $this->database);
+ // If a connection is made break the foreach loop
+ if ($this->conn_id)
+ {
+ break;
+ }
}
- return FALSE;
}
- else
+
+ // We still don't have a connection?
+ if ( ! $this->conn_id)
{
- // We've selected the DB. Now we set the character set
- if ( ! $this->db_set_charset($this->char_set, $this->dbcollat))
+ log_message('error', 'Unable to connect to the database');
+
+ if ($this->db_debug)
{
- return FALSE;
+ $this->display_error('db_unable_to_connect');
}
- return TRUE;
+ return FALSE;
}
}
+ // Now we set the character set and that's all
+ return $this->db_set_charset($this->char_set);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * DB connect
+ *
+ * This is just a dummy method that all drivers will override.
+ *
+ * @return mixed
+ */
+ public function db_connect()
+ {
return TRUE;
}
// --------------------------------------------------------------------
/**
+ * Persistent database connection
+ *
+ * @return mixed
+ */
+ public function db_pconnect()
+ {
+ return $this->db_connect(TRUE);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Reconnect
+ *
+ * Keep / reestablish the db connection if no queries have been
+ * sent for a length of time exceeding the server's idle timeout.
+ *
+ * This is just a dummy method to allow drivers without such
+ * functionality to not declare it, while others will override it.
+ *
+ * @return void
+ */
+ public function reconnect()
+ {
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Select database
+ *
+ * This is just a dummy method to allow drivers without such
+ * functionality to not declare it, while others will override it.
+ *
+ * @return bool
+ */
+ public function db_select()
+ {
+ return TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Last error
+ *
+ * @return array
+ */
+ public function error()
+ {
+ return array('code' => NULL, 'message' => NULL);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
* Set client character set
*
- * @access public
- * @param string
* @param string
- * @return resource
+ * @return bool
*/
- function db_set_charset($charset, $collation)
+ public function db_set_charset($charset)
{
- if ( ! $this->_db_set_charset($this->char_set, $this->dbcollat))
+ if (method_exists($this, '_db_set_charset') && ! $this->_db_set_charset($charset))
{
- log_message('error', 'Unable to set database connection charset: '.$this->char_set);
+ log_message('error', 'Unable to set database connection charset: '.$charset);
if ($this->db_debug)
{
- $this->display_error('db_unable_to_set_charset', $this->char_set);
+ $this->display_error('db_unable_to_set_charset', $charset);
}
return FALSE;
@@ -188,10 +544,9 @@ class CI_DB_driver {
/**
* The name of the platform in use (mysql, mssql, etc...)
*
- * @access public
* @return string
*/
- function platform()
+ public function platform()
{
return $this->dbdriver;
}
@@ -199,36 +554,39 @@ class CI_DB_driver {
// --------------------------------------------------------------------
/**
- * Database Version Number. Returns a string containing the
- * version of the database being used
+ * Database version number
+ *
+ * Returns a string containing the version of the database being used.
+ * Most drivers will override this method.
*
- * @access public
* @return string
*/
- function version()
+ public function version()
{
- if (FALSE === ($sql = $this->_version()))
+ if (isset($this->data_cache['version']))
{
- if ($this->db_debug)
- {
- return $this->display_error('db_unsupported_function');
- }
- return FALSE;
+ return $this->data_cache['version'];
}
- // Some DBs have functions that return the version, and don't run special
- // SQL queries per se. In these instances, just return the result.
- $driver_version_exceptions = array('oci8', 'sqlite', 'cubrid');
-
- if (in_array($this->dbdriver, $driver_version_exceptions))
- {
- return $sql;
- }
- else
+ if (FALSE === ($sql = $this->_version()))
{
- $query = $this->query($sql);
- return $query->row('ver');
+ return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
}
+
+ $query = $this->query($sql)->row();
+ return $this->data_cache['version'] = $query->ver;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Version number query string
+ *
+ * @return string
+ */
+ protected function _version()
+ {
+ return 'SELECT VERSION() AS ver';
}
// --------------------------------------------------------------------
@@ -237,32 +595,32 @@ class CI_DB_driver {
* Execute the query
*
* Accepts an SQL string as input and returns a result object upon
- * successful execution of a "read" type query. Returns boolean TRUE
+ * successful execution of a "read" type query. Returns boolean TRUE
* upon successful execution of a "write" type query. Returns boolean
* FALSE upon failure, and if the $db_debug variable is set to TRUE
* will raise an error.
*
- * @access public
- * @param string An SQL query string
- * @param array An array of binding data
+ * @param string $sql
+ * @param array $binds = FALSE An array of binding data
+ * @param bool $return_object = NULL
* @return mixed
*/
- function query($sql, $binds = FALSE, $return_object = TRUE)
+ public function query($sql, $binds = FALSE, $return_object = NULL)
{
- if ($sql == '')
+ if ($sql === '')
{
- if ($this->db_debug)
- {
- log_message('error', 'Invalid query: '.$sql);
- return $this->display_error('db_invalid_query');
- }
- return FALSE;
+ log_message('error', 'Invalid query: '.$sql);
+ return ($this->db_debug) ? $this->display_error('db_invalid_query') : FALSE;
+ }
+ elseif ( ! is_bool($return_object))
+ {
+ $return_object = ! $this->is_write_type($sql);
}
// Verify table prefix and replace if necessary
- if ( ($this->dbprefix != '' AND $this->swap_pre != '') AND ($this->dbprefix != $this->swap_pre) )
+ if ($this->dbprefix !== '' && $this->swap_pre !== '' && $this->dbprefix !== $this->swap_pre)
{
- $sql = preg_replace("/(\W)".$this->swap_pre."(\S+?)/", "\\1".$this->dbprefix."\\2", $sql);
+ $sql = preg_replace('/(\W)'.$this->swap_pre.'(\S+?)/', '\\1'.$this->dbprefix.'\\2', $sql);
}
// Compile binds if needed
@@ -271,87 +629,88 @@ class CI_DB_driver {
$sql = $this->compile_binds($sql, $binds);
}
- // Is query caching enabled? If the query is a "read type"
+ // Is query caching enabled? If the query is a "read type"
// we will load the caching class and return the previously
// cached query if it exists
- if ($this->cache_on == TRUE AND stristr($sql, 'SELECT'))
+ if ($this->cache_on === TRUE && $return_object === TRUE && $this->_cache_init())
{
- if ($this->_cache_init())
+ $this->load_rdriver();
+ if (FALSE !== ($cache = $this->CACHE->read($sql)))
{
- $this->load_rdriver();
- if (FALSE !== ($cache = $this->CACHE->read($sql)))
- {
- return $cache;
- }
+ return $cache;
}
}
- // Save the query for debugging
- if ($this->save_queries == TRUE)
+ // Save the query for debugging
+ if ($this->save_queries === TRUE)
{
$this->queries[] = $sql;
}
// Start the Query Timer
- $time_start = list($sm, $ss) = explode(' ', microtime());
+ $time_start = microtime(TRUE);
// Run the Query
if (FALSE === ($this->result_id = $this->simple_query($sql)))
{
- if ($this->save_queries == TRUE)
+ if ($this->save_queries === TRUE)
{
$this->query_times[] = 0;
}
// This will trigger a rollback if transactions are being used
- $this->_trans_status = FALSE;
+ if ($this->_trans_depth !== 0)
+ {
+ $this->_trans_status = FALSE;
+ }
+
+ // Grab the error now, as we might run some additional queries before displaying the error
+ $error = $this->error();
+
+ // Log errors
+ log_message('error', 'Query error: '.$error['message'].' - Invalid query: '.$sql);
if ($this->db_debug)
{
- // grab the error number and message now, as we might run some
- // additional queries before displaying the error
- $error_no = $this->_error_number();
- $error_msg = $this->_error_message();
-
// We call this function in order to roll-back queries
- // if transactions are enabled. If we don't call this here
+ // if transactions are enabled. If we don't call this here
// the error message will trigger an exit, causing the
// transactions to remain in limbo.
- $this->trans_complete();
-
- // Log and display errors
- log_message('error', 'Query error: '.$error_msg);
- return $this->display_error(
- array(
- 'Error Number: '.$error_no,
- $error_msg,
- $sql
- )
- );
+ while ($this->_trans_depth !== 0)
+ {
+ $trans_depth = $this->_trans_depth;
+ $this->trans_complete();
+ if ($trans_depth === $this->_trans_depth)
+ {
+ log_message('error', 'Database: Failure during an automated transaction commit/rollback!');
+ break;
+ }
+ }
+
+ // Display errors
+ return $this->display_error(array('Error Number: '.$error['code'], $error['message'], $sql));
}
return FALSE;
}
// Stop and aggregate the query time results
- $time_end = list($em, $es) = explode(' ', microtime());
- $this->benchmark += ($em + $es) - ($sm + $ss);
+ $time_end = microtime(TRUE);
+ $this->benchmark += $time_end - $time_start;
- if ($this->save_queries == TRUE)
+ if ($this->save_queries === TRUE)
{
- $this->query_times[] = ($em + $es) - ($sm + $ss);
+ $this->query_times[] = $time_end - $time_start;
}
// Increment the query counter
$this->query_count++;
- // Was the query a "write" type?
- // If so we'll simply return true
- if ($this->is_write_type($sql) === TRUE)
+ // Will we have a result object instantiated? If not - we'll simply return TRUE
+ if ($return_object !== TRUE)
{
- // If caching is enabled we'll auto-cleanup any
- // existing files related to this particular URI
- if ($this->cache_on == TRUE AND $this->cache_autodel == TRUE AND $this->_cache_init())
+ // If caching is enabled we'll auto-cleanup any existing files related to this particular URI
+ if ($this->cache_on === TRUE && $this->cache_autodel === TRUE && $this->_cache_init())
{
$this->CACHE->delete();
}
@@ -359,35 +718,13 @@ class CI_DB_driver {
return TRUE;
}
- // Return TRUE if we don't need to create a result object
- // Currently only the Oracle driver uses this when stored
- // procedures are used
- if ($return_object !== TRUE)
- {
- return TRUE;
- }
-
// Load and instantiate the result driver
+ $driver = $this->load_rdriver();
+ $RES = new $driver($this);
- $driver = $this->load_rdriver();
- $RES = new $driver();
- $RES->conn_id = $this->conn_id;
- $RES->result_id = $this->result_id;
-
- if ($this->dbdriver == 'oci8')
- {
- $RES->stmt_id = $this->stmt_id;
- $RES->curs_id = NULL;
- $RES->limit_used = $this->limit_used;
- $this->stmt_id = FALSE;
- }
-
- // oci8 vars must be set before calling this
- $RES->num_rows = $RES->num_rows();
-
- // Is query caching enabled? If so, we'll serialize the
+ // Is query caching enabled? If so, we'll serialize the
// result object and save it to a cache file.
- if ($this->cache_on == TRUE AND $this->_cache_init())
+ if ($this->cache_on === TRUE && $this->_cache_init())
{
// We'll create a new instance of the result object
// only without the platform specific driver since
@@ -395,10 +732,10 @@ class CI_DB_driver {
// resource ID won't be any good once we've cached the
// result object, so we'll have to compile the data
// and save it)
- $CR = new CI_DB_result();
- $CR->num_rows = $RES->num_rows();
+ $CR = new CI_DB_result($this);
$CR->result_object = $RES->result_object();
$CR->result_array = $RES->result_array();
+ $CR->num_rows = $RES->num_rows();
// Reset these since cached objects can not utilize resource IDs.
$CR->conn_id = NULL;
@@ -415,17 +752,16 @@ class CI_DB_driver {
/**
* Load the result drivers
*
- * @access public
* @return string the name of the result class
*/
- function load_rdriver()
+ public function load_rdriver()
{
$driver = 'CI_DB_'.$this->dbdriver.'_result';
- if ( ! class_exists($driver))
+ if ( ! class_exists($driver, FALSE))
{
- include_once(BASEPATH.'database/DB_result.php');
- include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result.php');
+ require_once(BASEPATH.'database/DB_result.php');
+ require_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result.php');
}
return $driver;
@@ -435,19 +771,21 @@ class CI_DB_driver {
/**
* Simple Query
- * This is a simplified version of the query() function. Internally
+ * This is a simplified version of the query() function. Internally
* we only use it when running transaction commands since they do
* not require all the features of the main query() function.
*
- * @access public
* @param string the sql query
* @return mixed
*/
- function simple_query($sql)
+ public function simple_query($sql)
{
if ( ! $this->conn_id)
{
- $this->initialize();
+ if ( ! $this->initialize())
+ {
+ return FALSE;
+ }
}
return $this->_execute($sql);
@@ -459,10 +797,9 @@ class CI_DB_driver {
* Disable Transactions
* This permits transactions to be disabled at run-time.
*
- * @access public
* @return void
*/
- function trans_off()
+ public function trans_off()
{
$this->trans_enabled = FALSE;
}
@@ -471,15 +808,18 @@ class CI_DB_driver {
/**
* Enable/disable Transaction Strict Mode
+ *
* When strict mode is enabled, if you are running multiple groups of
- * transactions, if one group fails all groups will be rolled back.
- * If strict mode is disabled, each group is treated autonomously, meaning
- * a failure of one group will not affect any others
+ * transactions, if one group fails all subsequent groups will be
+ * rolled back.
*
- * @access public
+ * If strict mode is disabled, each group is treated autonomously,
+ * meaning a failure of one group will not affect any others
+ *
+ * @param bool $mode = TRUE
* @return void
*/
- function trans_strict($mode = TRUE)
+ public function trans_strict($mode = TRUE)
{
$this->trans_strict = is_bool($mode) ? $mode : TRUE;
}
@@ -489,24 +829,17 @@ class CI_DB_driver {
/**
* Start Transaction
*
- * @access public
- * @return void
+ * @param bool $test_mode = FALSE
+ * @return bool
*/
- function trans_start($test_mode = FALSE)
+ public function trans_start($test_mode = FALSE)
{
if ( ! $this->trans_enabled)
{
return FALSE;
}
- // When transactions are nested we only begin/commit/rollback the outermost ones
- if ($this->_trans_depth > 0)
- {
- $this->_trans_depth += 1;
- return;
- }
-
- $this->trans_begin($test_mode);
+ return $this->trans_begin($test_mode);
}
// --------------------------------------------------------------------
@@ -514,31 +847,23 @@ class CI_DB_driver {
/**
* Complete Transaction
*
- * @access public
* @return bool
*/
- function trans_complete()
+ public function trans_complete()
{
if ( ! $this->trans_enabled)
{
return FALSE;
}
- // When transactions are nested we only begin/commit/rollback the outermost ones
- if ($this->_trans_depth > 1)
- {
- $this->_trans_depth -= 1;
- return TRUE;
- }
-
// The query() function will set this flag to FALSE in the event that a query failed
- if ($this->_trans_status === FALSE)
+ if ($this->_trans_status === FALSE OR $this->_trans_failure === TRUE)
{
$this->trans_rollback();
// If we are NOT running in strict mode, we will reset
- // the _trans_status flag so that subsequent groups of transactions
- // will be permitted.
+ // the _trans_status flag so that subsequent groups of
+ // transactions will be permitted.
if ($this->trans_strict === FALSE)
{
$this->_trans_status = TRUE;
@@ -548,8 +873,7 @@ class CI_DB_driver {
return FALSE;
}
- $this->trans_commit();
- return TRUE;
+ return $this->trans_commit();
}
// --------------------------------------------------------------------
@@ -557,10 +881,9 @@ class CI_DB_driver {
/**
* Lets you retrieve the transaction flag to determine if it has failed
*
- * @access public
* @return bool
*/
- function trans_status()
+ public function trans_status()
{
return $this->_trans_status;
}
@@ -568,44 +891,147 @@ class CI_DB_driver {
// --------------------------------------------------------------------
/**
+ * Begin Transaction
+ *
+ * @param bool $test_mode
+ * @return bool
+ */
+ public function trans_begin($test_mode = FALSE)
+ {
+ if ( ! $this->trans_enabled)
+ {
+ return FALSE;
+ }
+ // When transactions are nested we only begin/commit/rollback the outermost ones
+ elseif ($this->_trans_depth > 0)
+ {
+ $this->_trans_depth++;
+ return TRUE;
+ }
+
+ // Reset the transaction failure flag.
+ // If the $test_mode flag is set to TRUE transactions will be rolled back
+ // even if the queries produce a successful result.
+ $this->_trans_failure = ($test_mode === TRUE);
+
+ if ($this->_trans_begin())
+ {
+ $this->_trans_depth++;
+ return TRUE;
+ }
+
+ return FALSE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Commit Transaction
+ *
+ * @return bool
+ */
+ public function trans_commit()
+ {
+ if ( ! $this->trans_enabled OR $this->_trans_depth === 0)
+ {
+ return FALSE;
+ }
+ // When transactions are nested we only begin/commit/rollback the outermost ones
+ elseif ($this->_trans_depth > 1 OR $this->_trans_commit())
+ {
+ $this->_trans_depth--;
+ return TRUE;
+ }
+
+ return FALSE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Rollback Transaction
+ *
+ * @return bool
+ */
+ public function trans_rollback()
+ {
+ if ( ! $this->trans_enabled OR $this->_trans_depth === 0)
+ {
+ return FALSE;
+ }
+ // When transactions are nested we only begin/commit/rollback the outermost ones
+ elseif ($this->_trans_depth > 1 OR $this->_trans_rollback())
+ {
+ $this->_trans_depth--;
+ return TRUE;
+ }
+
+ return FALSE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
* Compile Bindings
*
- * @access public
* @param string the sql statement
* @param array an array of bind data
* @return string
*/
- function compile_binds($sql, $binds)
+ public function compile_binds($sql, $binds)
{
- if (strpos($sql, $this->bind_marker) === FALSE)
+ if (empty($this->bind_marker) OR strpos($sql, $this->bind_marker) === FALSE)
{
return $sql;
}
-
- if ( ! is_array($binds))
+ elseif ( ! is_array($binds))
{
$binds = array($binds);
+ $bind_count = 1;
+ }
+ else
+ {
+ // Make sure we're using numeric keys
+ $binds = array_values($binds);
+ $bind_count = count($binds);
}
- // Get the sql segments around the bind markers
- $segments = explode($this->bind_marker, $sql);
+ // We'll need the marker length later
+ $ml = strlen($this->bind_marker);
- // The count of bind should be 1 less then the count of segments
- // If there are more bind arguments trim it down
- if (count($binds) >= count($segments)) {
- $binds = array_slice($binds, 0, count($segments)-1);
+ // Make sure not to replace a chunk inside a string that happens to match the bind marker
+ if ($c = preg_match_all("/'[^']*'|\"[^\"]*\"/i", $sql, $matches))
+ {
+ $c = preg_match_all('/'.preg_quote($this->bind_marker, '/').'/i',
+ str_replace($matches[0],
+ str_replace($this->bind_marker, str_repeat(' ', $ml), $matches[0]),
+ $sql, $c),
+ $matches, PREG_OFFSET_CAPTURE);
+
+ // Bind values' count must match the count of markers in the query
+ if ($bind_count !== $c)
+ {
+ return $sql;
+ }
+ }
+ elseif (($c = preg_match_all('/'.preg_quote($this->bind_marker, '/').'/i', $sql, $matches, PREG_OFFSET_CAPTURE)) !== $bind_count)
+ {
+ return $sql;
}
- // Construct the binded query
- $result = $segments[0];
- $i = 0;
- foreach ($binds as $bind)
+ do
{
- $result .= $this->escape($bind);
- $result .= $segments[++$i];
+ $c--;
+ $escaped_value = $this->escape($binds[$c]);
+ if (is_array($escaped_value))
+ {
+ $escaped_value = '('.implode(',', $escaped_value).')';
+ }
+ $sql = substr_replace($sql, $escaped_value, $matches[0][$c][1], $ml);
}
+ while ($c !== 0);
- return $result;
+ return $sql;
}
// --------------------------------------------------------------------
@@ -613,17 +1039,12 @@ class CI_DB_driver {
/**
* Determines if a query is a "write" type.
*
- * @access public
* @param string An SQL query string
- * @return boolean
+ * @return bool
*/
- function is_write_type($sql)
+ public function is_write_type($sql)
{
- if ( ! preg_match('/^\s*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|LOAD DATA|COPY|ALTER|GRANT|REVOKE|LOCK|UNLOCK)\s+/i', $sql))
- {
- return FALSE;
- }
- return TRUE;
+ return (bool) preg_match('/^\s*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|LOAD|COPY|ALTER|RENAME|GRANT|REVOKE|LOCK|UNLOCK|REINDEX)\s/i', $sql);
}
// --------------------------------------------------------------------
@@ -631,11 +1052,10 @@ class CI_DB_driver {
/**
* Calculate the aggregate query elapsed time
*
- * @access public
- * @param integer The number of decimal places
- * @return integer
+ * @param int The number of decimal places
+ * @return string
*/
- function elapsed_time($decimals = 6)
+ public function elapsed_time($decimals = 6)
{
return number_format($this->benchmark, $decimals);
}
@@ -645,10 +1065,9 @@ class CI_DB_driver {
/**
* Returns the total number of queries
*
- * @access public
- * @return integer
+ * @return int
*/
- function total_queries()
+ public function total_queries()
{
return $this->query_count;
}
@@ -658,10 +1077,9 @@ class CI_DB_driver {
/**
* Returns the last query that was executed
*
- * @access public
- * @return void
+ * @return string
*/
- function last_query()
+ public function last_query()
{
return end($this->queries);
}
@@ -674,23 +1092,63 @@ class CI_DB_driver {
* Escapes data based on type
* Sets boolean and null types
*
- * @access public
* @param string
* @return mixed
*/
- function escape($str)
+ public function escape($str)
{
- if (is_string($str))
+ if (is_array($str))
{
- $str = "'".$this->escape_str($str)."'";
+ $str = array_map(array(&$this, 'escape'), $str);
+ return $str;
+ }
+ elseif (is_string($str) OR (is_object($str) && method_exists($str, '__toString')))
+ {
+ return "'".$this->escape_str($str)."'";
}
elseif (is_bool($str))
{
- $str = ($str === FALSE) ? 0 : 1;
+ return ($str === FALSE) ? 0 : 1;
+ }
+ elseif ($str === NULL)
+ {
+ return 'NULL';
}
- elseif (is_null($str))
+
+ return $str;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Escape String
+ *
+ * @param string|string[] $str Input string
+ * @param bool $like Whether or not the string will be used in a LIKE condition
+ * @return string
+ */
+ public function escape_str($str, $like = FALSE)
+ {
+ if (is_array($str))
+ {
+ foreach ($str as $key => $val)
+ {
+ $str[$key] = $this->escape_str($val, $like);
+ }
+
+ return $str;
+ }
+
+ $str = $this->_escape_str($str);
+
+ // escape LIKE condition wildcards
+ if ($like === TRUE)
{
- $str = 'NULL';
+ return str_replace(
+ array($this->_like_escape_chr, '%', '_'),
+ array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'),
+ $str
+ );
}
return $str;
@@ -704,11 +1162,10 @@ class CI_DB_driver {
* Calls the individual driver for platform
* specific escaping for LIKE conditions
*
- * @access public
- * @param string
+ * @param string|string[]
* @return mixed
*/
- function escape_like_str($str)
+ public function escape_like_str($str)
{
return $this->escape_str($str, TRUE);
}
@@ -716,25 +1173,60 @@ class CI_DB_driver {
// --------------------------------------------------------------------
/**
+ * Platform-dependent string escape
+ *
+ * @param string
+ * @return string
+ */
+ protected function _escape_str($str)
+ {
+ return str_replace("'", "''", remove_invisible_characters($str, FALSE));
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
* Primary
*
- * Retrieves the primary key. It assumes that the row in the first
+ * Retrieves the primary key. It assumes that the row in the first
* position is the primary key
*
- * @access public
- * @param string the table name
+ * @param string $table Table name
* @return string
*/
- function primary($table = '')
+ public function primary($table)
{
$fields = $this->list_fields($table);
+ return is_array($fields) ? current($fields) : FALSE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * "Count All" query
+ *
+ * Generates a platform-specific query string that counts all records in
+ * the specified database
+ *
+ * @param string
+ * @return int
+ */
+ public function count_all($table = '')
+ {
+ if ($table === '')
+ {
+ return 0;
+ }
- if ( ! is_array($fields))
+ $query = $this->query($this->_count_string.$this->escape_identifiers('numrows').' FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE));
+ if ($query->num_rows() === 0)
{
- return FALSE;
+ return 0;
}
- return current($fields);
+ $query = $query->row();
+ $this->_reset_select();
+ return (int) $query->numrows;
}
// --------------------------------------------------------------------
@@ -742,10 +1234,10 @@ class CI_DB_driver {
/**
* Returns an array of table names
*
- * @access public
+ * @param string $constrain_by_prefix = FALSE
* @return array
*/
- function list_tables($constrain_by_prefix = FALSE)
+ public function list_tables($constrain_by_prefix = FALSE)
{
// Is there a cached result?
if (isset($this->data_cache['table_names']))
@@ -755,32 +1247,40 @@ class CI_DB_driver {
if (FALSE === ($sql = $this->_list_tables($constrain_by_prefix)))
{
- if ($this->db_debug)
- {
- return $this->display_error('db_unsupported_function');
- }
- return FALSE;
+ return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
}
- $retval = array();
+ $this->data_cache['table_names'] = array();
$query = $this->query($sql);
- if ($query->num_rows() > 0)
+ foreach ($query->result_array() as $row)
{
- foreach ($query->result_array() as $row)
+ // Do we know from which column to get the table name?
+ if ( ! isset($key))
{
- if (isset($row['TABLE_NAME']))
+ if (isset($row['table_name']))
{
- $retval[] = $row['TABLE_NAME'];
+ $key = 'table_name';
+ }
+ elseif (isset($row['TABLE_NAME']))
+ {
+ $key = 'TABLE_NAME';
}
else
{
- $retval[] = array_shift($row);
+ /* We have no other choice but to just get the first element's key.
+ * Due to array_shift() accepting its argument by reference, if
+ * E_STRICT is on, this would trigger a warning. So we'll have to
+ * assign it first.
+ */
+ $key = array_keys($row);
+ $key = array_shift($key);
}
}
+
+ $this->data_cache['table_names'][] = $row[$key];
}
- $this->data_cache['table_names'] = $retval;
return $this->data_cache['table_names'];
}
@@ -788,24 +1288,24 @@ class CI_DB_driver {
/**
* Determine if a particular table exists
- * @access public
- * @return boolean
+ *
+ * @param string $table_name
+ * @return bool
*/
- function table_exists($table_name)
+ public function table_exists($table_name)
{
- return ( ! in_array($this->_protect_identifiers($table_name, TRUE, FALSE, FALSE), $this->list_tables())) ? FALSE : TRUE;
+ return in_array($this->protect_identifiers($table_name, TRUE, FALSE, FALSE), $this->list_tables());
}
// --------------------------------------------------------------------
/**
- * Fetch MySQL Field Names
+ * Fetch Field Names
*
- * @access public
- * @param string the table name
+ * @param string $table Table name
* @return array
*/
- function list_fields($table = '')
+ public function list_fields($table)
{
// Is there a cached result?
if (isset($this->data_cache['field_names'][$table]))
@@ -813,40 +1313,37 @@ class CI_DB_driver {
return $this->data_cache['field_names'][$table];
}
- if ($table == '')
- {
- if ($this->db_debug)
- {
- return $this->display_error('db_field_param_missing');
- }
- return FALSE;
- }
-
if (FALSE === ($sql = $this->_list_columns($table)))
{
- if ($this->db_debug)
- {
- return $this->display_error('db_unsupported_function');
- }
- return FALSE;
+ return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
}
$query = $this->query($sql);
+ $this->data_cache['field_names'][$table] = array();
- $retval = array();
foreach ($query->result_array() as $row)
{
- if (isset($row['COLUMN_NAME']))
+ // Do we know from where to get the column's name?
+ if ( ! isset($key))
{
- $retval[] = $row['COLUMN_NAME'];
- }
- else
- {
- $retval[] = current($row);
+ if (isset($row['column_name']))
+ {
+ $key = 'column_name';
+ }
+ elseif (isset($row['COLUMN_NAME']))
+ {
+ $key = 'COLUMN_NAME';
+ }
+ else
+ {
+ // We have no other choice but to just get the first element's key.
+ $key = key($row);
+ }
}
+
+ $this->data_cache['field_names'][$table][] = $row[$key];
}
- $this->data_cache['field_names'][$table] = $retval;
return $this->data_cache['field_names'][$table];
}
@@ -854,14 +1351,14 @@ class CI_DB_driver {
/**
* Determine if a particular field exists
- * @access public
+ *
* @param string
* @param string
- * @return boolean
+ * @return bool
*/
- function field_exists($field_name, $table_name)
+ public function field_exists($field_name, $table_name)
{
- return ( ! in_array($field_name, $this->list_fields($table_name))) ? FALSE : TRUE;
+ return in_array($field_name, $this->list_fields($table_name));
}
// --------------------------------------------------------------------
@@ -869,24 +1366,75 @@ class CI_DB_driver {
/**
* Returns an object with field data
*
- * @access public
- * @param string the table name
- * @return object
+ * @param string $table the table name
+ * @return array
*/
- function field_data($table = '')
+ public function field_data($table)
{
- if ($table == '')
+ $query = $this->query($this->_field_data($this->protect_identifiers($table, TRUE, NULL, FALSE)));
+ return ($query) ? $query->field_data() : FALSE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Escape the SQL Identifiers
+ *
+ * This function escapes column and table names
+ *
+ * @param mixed
+ * @return mixed
+ */
+ public function escape_identifiers($item)
+ {
+ if ($this->_escape_char === '' OR empty($item) OR in_array($item, $this->_reserved_identifiers))
{
- if ($this->db_debug)
+ return $item;
+ }
+ elseif (is_array($item))
+ {
+ foreach ($item as $key => $value)
{
- return $this->display_error('db_field_param_missing');
+ $item[$key] = $this->escape_identifiers($value);
}
- return FALSE;
+
+ return $item;
+ }
+ // Avoid breaking functions and literal values inside queries
+ elseif (ctype_digit($item) OR $item[0] === "'" OR ($this->_escape_char !== '"' && $item[0] === '"') OR strpos($item, '(') !== FALSE)
+ {
+ return $item;
}
- $query = $this->query($this->_field_data($this->_protect_identifiers($table, TRUE, NULL, FALSE)));
+ static $preg_ec = array();
- return $query->field_data();
+ if (empty($preg_ec))
+ {
+ if (is_array($this->_escape_char))
+ {
+ $preg_ec = array(
+ preg_quote($this->_escape_char[0], '/'),
+ preg_quote($this->_escape_char[1], '/'),
+ $this->_escape_char[0],
+ $this->_escape_char[1]
+ );
+ }
+ else
+ {
+ $preg_ec[0] = $preg_ec[1] = preg_quote($this->_escape_char, '/');
+ $preg_ec[2] = $preg_ec[3] = $this->_escape_char;
+ }
+ }
+
+ foreach ($this->_reserved_identifiers as $id)
+ {
+ if (strpos($item, '.'.$id) !== FALSE)
+ {
+ return preg_replace('/'.$preg_ec[0].'?([^'.$preg_ec[1].'\.]+)'.$preg_ec[1].'?\./i', $preg_ec[2].'$1'.$preg_ec[3].'.', $item);
+ }
+ }
+
+ return preg_replace('/'.$preg_ec[0].'?([^'.$preg_ec[1].'\.]+)'.$preg_ec[1].'?(\.)?/i', $preg_ec[2].'$1'.$preg_ec[3].'$2', $item);
}
// --------------------------------------------------------------------
@@ -894,23 +1442,38 @@ class CI_DB_driver {
/**
* Generate an insert string
*
- * @access public
* @param string the table upon which the query will be performed
* @param array an associative array data of key/values
* @return string
*/
- function insert_string($table, $data)
+ public function insert_string($table, $data)
{
- $fields = array();
- $values = array();
+ $fields = $values = array();
foreach ($data as $key => $val)
{
- $fields[] = $this->_escape_identifiers($key);
+ $fields[] = $this->escape_identifiers($key);
$values[] = $this->escape($val);
}
- return $this->_insert($this->_protect_identifiers($table, TRUE, NULL, FALSE), $fields, $values);
+ return $this->_insert($this->protect_identifiers($table, TRUE, NULL, FALSE), $fields, $values);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Insert statement
+ *
+ * Generates a platform-specific insert string from the supplied data
+ *
+ * @param string the table name
+ * @param array the insert keys
+ * @param array the insert values
+ * @return string
+ */
+ protected function _insert($table, $keys, $values)
+ {
+ return 'INSERT INTO '.$table.' ('.implode(', ', $keys).') VALUES ('.implode(', ', $values).')';
}
// --------------------------------------------------------------------
@@ -918,51 +1481,53 @@ class CI_DB_driver {
/**
* Generate an update string
*
- * @access public
* @param string the table upon which the query will be performed
* @param array an associative array data of key/values
* @param mixed the "where" statement
* @return string
*/
- function update_string($table, $data, $where)
+ public function update_string($table, $data, $where)
{
- if ($where == '')
+ if (empty($where))
{
- return false;
+ return FALSE;
}
+ $this->where($where);
+
$fields = array();
foreach ($data as $key => $val)
{
- $fields[$this->_protect_identifiers($key)] = $this->escape($val);
+ $fields[$this->protect_identifiers($key)] = $this->escape($val);
}
- if ( ! is_array($where))
- {
- $dest = array($where);
- }
- else
- {
- $dest = array();
- foreach ($where as $key => $val)
- {
- $prefix = (count($dest) == 0) ? '' : ' AND ';
-
- if ($val !== '')
- {
- if ( ! $this->_has_operator($key))
- {
- $key .= ' =';
- }
+ $sql = $this->_update($this->protect_identifiers($table, TRUE, NULL, FALSE), $fields);
+ $this->_reset_write();
+ return $sql;
+ }
- $val = ' '.$this->escape($val);
- }
+ // --------------------------------------------------------------------
- $dest[] = $prefix.$key.$val;
- }
+ /**
+ * Update statement
+ *
+ * Generates a platform-specific update string from the supplied data
+ *
+ * @param string the table name
+ * @param array the update data
+ * @return string
+ */
+ protected function _update($table, $values)
+ {
+ foreach ($values as $key => $val)
+ {
+ $valstr[] = $key.' = '.$val;
}
- return $this->_update($this->_protect_identifiers($table, TRUE, NULL, FALSE), $fields, $dest);
+ return 'UPDATE '.$table.' SET '.implode(', ', $valstr)
+ .$this->_compile_wh('qb_where')
+ .$this->_compile_order_by()
+ .($this->qb_limit ? ' LIMIT '.$this->qb_limit : '');
}
// --------------------------------------------------------------------
@@ -970,19 +1535,50 @@ class CI_DB_driver {
/**
* Tests whether the string has an SQL operator
*
- * @access private
* @param string
* @return bool
*/
- function _has_operator($str)
+ protected function _has_operator($str)
{
- $str = trim($str);
- if ( ! preg_match("/(\s|<|>|!|=|is null|is not null)/i", $str))
- {
- return FALSE;
- }
+ return (bool) preg_match('/(<|>|!|=|\sIS NULL|\sIS NOT NULL|\sEXISTS|\sBETWEEN|\sLIKE|\sIN\s*\(|\s)/i', trim($str));
+ }
- return TRUE;
+ // --------------------------------------------------------------------
+
+ /**
+ * Returns the SQL string operator
+ *
+ * @param string
+ * @return string
+ */
+ protected function _get_operator($str)
+ {
+ static $_operators;
+
+ if (empty($_operators))
+ {
+ $_les = ($this->_like_escape_str !== '')
+ ? '\s+'.preg_quote(trim(sprintf($this->_like_escape_str, $this->_like_escape_chr)), '/')
+ : '';
+ $_operators = array(
+ '\s*(?:<|>|!)?=\s*', // =, <=, >=, !=
+ '\s*<>?\s*', // <, <>
+ '\s*>\s*', // >
+ '\s+IS NULL', // IS NULL
+ '\s+IS NOT NULL', // IS NOT NULL
+ '\s+EXISTS\s*\(.*\)', // EXISTS(sql)
+ '\s+NOT EXISTS\s*\(.*\)', // NOT EXISTS(sql)
+ '\s+BETWEEN\s+', // BETWEEN value AND value
+ '\s+IN\s*\(.*\)', // IN(list)
+ '\s+NOT IN\s*\(.*\)', // NOT IN (list)
+ '\s+LIKE\s+\S.*('.$_les.')?', // LIKE 'expr'[ ESCAPE '%s']
+ '\s+NOT LIKE\s+\S.*('.$_les.')?' // NOT LIKE 'expr'[ ESCAPE '%s']
+ );
+
+ }
+
+ return preg_match('/'.implode('|', $_operators).'/i', $str, $match)
+ ? $match[0] : FALSE;
}
// --------------------------------------------------------------------
@@ -990,14 +1586,12 @@ class CI_DB_driver {
/**
* Enables a native PHP function to be run, using a platform agnostic wrapper.
*
- * @access public
- * @param string the function name
- * @param mixed any parameters needed by the function
+ * @param string $function Function name
* @return mixed
*/
- function call_function($function)
+ public function call_function($function)
{
- $driver = ($this->dbdriver == 'postgre') ? 'pg_' : $this->dbdriver.'_';
+ $driver = ($this->dbdriver === 'postgre') ? 'pg_' : $this->dbdriver.'_';
if (FALSE === strpos($driver, $function))
{
@@ -1006,24 +1600,12 @@ class CI_DB_driver {
if ( ! function_exists($function))
{
- if ($this->db_debug)
- {
- return $this->display_error('db_unsupported_function');
- }
- return FALSE;
- }
- else
- {
- $args = (func_num_args() > 1) ? array_splice(func_get_args(), 1) : null;
- if (is_null($args))
- {
- return call_user_func($function);
- }
- else
- {
- return call_user_func_array($function, $args);
- }
+ return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
}
+
+ return (func_num_args() > 1)
+ ? call_user_func_array($function, array_slice(func_get_args(), 1))
+ : call_user_func($function);
}
// --------------------------------------------------------------------
@@ -1031,11 +1613,10 @@ class CI_DB_driver {
/**
* Set Cache Directory Path
*
- * @access public
* @param string the path to the cache directory
* @return void
*/
- function cache_set_path($path = '')
+ public function cache_set_path($path = '')
{
$this->cachedir = $path;
}
@@ -1045,13 +1626,11 @@ class CI_DB_driver {
/**
* Enable Query Caching
*
- * @access public
- * @return void
+ * @return bool cache_on value
*/
- function cache_on()
+ public function cache_on()
{
- $this->cache_on = TRUE;
- return TRUE;
+ return $this->cache_on = TRUE;
}
// --------------------------------------------------------------------
@@ -1059,31 +1638,27 @@ class CI_DB_driver {
/**
* Disable Query Caching
*
- * @access public
- * @return void
+ * @return bool cache_on value
*/
- function cache_off()
+ public function cache_off()
{
- $this->cache_on = FALSE;
- return FALSE;
+ return $this->cache_on = FALSE;
}
-
// --------------------------------------------------------------------
/**
* Delete the cache files associated with a particular URI
*
- * @access public
- * @return void
+ * @param string $segment_one = ''
+ * @param string $segment_two = ''
+ * @return bool
*/
- function cache_delete($segment_one = '', $segment_two = '')
+ public function cache_delete($segment_one = '', $segment_two = '')
{
- if ( ! $this->_cache_init())
- {
- return FALSE;
- }
- return $this->CACHE->delete($segment_one, $segment_two);
+ return $this->_cache_init()
+ ? $this->CACHE->delete($segment_one, $segment_two)
+ : FALSE;
}
// --------------------------------------------------------------------
@@ -1091,17 +1666,13 @@ class CI_DB_driver {
/**
* Delete All cache files
*
- * @access public
- * @return void
+ * @return bool
*/
- function cache_delete_all()
+ public function cache_delete_all()
{
- if ( ! $this->_cache_init())
- {
- return FALSE;
- }
-
- return $this->CACHE->delete_all();
+ return $this->_cache_init()
+ ? $this->CACHE->delete_all()
+ : FALSE;
}
// --------------------------------------------------------------------
@@ -1109,22 +1680,17 @@ class CI_DB_driver {
/**
* Initialize the Cache Class
*
- * @access private
- * @return void
+ * @return bool
*/
- function _cache_init()
+ protected function _cache_init()
{
- if (is_object($this->CACHE) AND class_exists('CI_DB_Cache'))
+ if ( ! class_exists('CI_DB_Cache', FALSE))
{
- return TRUE;
+ require_once(BASEPATH.'database/DB_cache.php');
}
-
- if ( ! class_exists('CI_DB_Cache'))
+ elseif (is_object($this->CACHE))
{
- if ( ! @include(BASEPATH.'database/DB_cache.php'))
- {
- return $this->cache_off();
- }
+ return TRUE;
}
$this->CACHE = new CI_DB_Cache($this); // pass db object to support multiple db connections and returned db objects
@@ -1136,15 +1702,28 @@ class CI_DB_driver {
/**
* Close DB Connection
*
- * @access public
* @return void
*/
- function close()
+ public function close()
{
- if (is_resource($this->conn_id) OR is_object($this->conn_id))
+ if ($this->conn_id)
{
- $this->_close($this->conn_id);
+ $this->_close();
+ $this->conn_id = FALSE;
}
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Close DB Connection
+ *
+ * This method would be overridden by most of the drivers.
+ *
+ * @return void
+ */
+ protected function _close()
+ {
$this->conn_id = FALSE;
}
@@ -1153,49 +1732,54 @@ class CI_DB_driver {
/**
* Display an error message
*
- * @access public
* @param string the error message
* @param string any "swap" values
- * @param boolean whether to localize the message
- * @return string sends the application/error_db.php template
+ * @param bool whether to localize the message
+ * @return string sends the application/views/errors/error_db.php template
*/
- function display_error($error = '', $swap = '', $native = FALSE)
+ public function display_error($error = '', $swap = '', $native = FALSE)
{
$LANG =& load_class('Lang', 'core');
$LANG->load('db');
$heading = $LANG->line('db_error_heading');
- if ($native == TRUE)
+ if ($native === TRUE)
{
- $message = $error;
+ $message = (array) $error;
}
else
{
- $message = ( ! is_array($error)) ? array(str_replace('%s', $swap, $LANG->line($error))) : $error;
+ $message = is_array($error) ? $error : array(str_replace('%s', $swap, $LANG->line($error)));
}
// Find the most likely culprit of the error by going through
// the backtrace until the source file is no longer in the
// database folder.
-
$trace = debug_backtrace();
-
foreach ($trace as $call)
{
- if (isset($call['file']) && strpos($call['file'], BASEPATH.'database') === FALSE)
+ if (isset($call['file'], $call['class']))
{
- // Found it - use a relative path for safety
- $message[] = 'Filename: '.str_replace(array(BASEPATH, APPPATH), '', $call['file']);
- $message[] = 'Line Number: '.$call['line'];
+ // We'll need this on Windows, as APPPATH and BASEPATH will always use forward slashes
+ if (DIRECTORY_SEPARATOR !== '/')
+ {
+ $call['file'] = str_replace('\\', '/', $call['file']);
+ }
- break;
+ if (strpos($call['file'], BASEPATH.'database') === FALSE && strpos($call['class'], 'Loader') === FALSE)
+ {
+ // Found it - use a relative path for safety
+ $message[] = 'Filename: '.str_replace(array(APPPATH, BASEPATH), '', $call['file']);
+ $message[] = 'Line Number: '.$call['line'];
+ break;
+ }
}
}
$error =& load_class('Exceptions', 'core');
echo $error->show_error($heading, $message, 'error_db');
- exit;
+ exit(8); // EXIT_DATABASE
}
// --------------------------------------------------------------------
@@ -1203,29 +1787,13 @@ class CI_DB_driver {
/**
* Protect Identifiers
*
- * This function adds backticks if appropriate based on db type
- *
- * @access private
- * @param mixed the item to escape
- * @return mixed the item with backticks
- */
- function protect_identifiers($item, $prefix_single = FALSE)
- {
- return $this->_protect_identifiers($item, $prefix_single);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Protect Identifiers
- *
- * This function is used extensively by the Active Record class, and by
+ * This function is used extensively by the Query Builder class, and by
* a couple functions in this class.
* It takes a column or table name (optionally with an alias) and inserts
- * the table prefix onto it. Some logic is necessary in order to deal with
- * column names that include the path. Consider a query like this:
+ * the table prefix onto it. Some logic is necessary in order to deal with
+ * column names that include the path. Consider a query like this:
*
- * SELECT * FROM hostname.database.table.column AS c FROM hostname.database.table
+ * SELECT hostname.database.table.column AS c FROM hostname.database.table
*
* Or a query with aliasing:
*
@@ -1236,14 +1804,13 @@ class CI_DB_driver {
* insert the table prefix (if it exists) in the proper position, and escape only
* the correct identifiers.
*
- * @access private
* @param string
* @param bool
* @param mixed
* @param bool
* @return string
*/
- function _protect_identifiers($item, $prefix_single = FALSE, $protect_identifiers = NULL, $field_exists = TRUE)
+ public function protect_identifiers($item, $prefix_single = FALSE, $protect_identifiers = NULL, $field_exists = TRUE)
{
if ( ! is_bool($protect_identifiers))
{
@@ -1253,37 +1820,48 @@ class CI_DB_driver {
if (is_array($item))
{
$escaped_array = array();
-
foreach ($item as $k => $v)
{
- $escaped_array[$this->_protect_identifiers($k)] = $this->_protect_identifiers($v);
+ $escaped_array[$this->protect_identifiers($k)] = $this->protect_identifiers($v, $prefix_single, $protect_identifiers, $field_exists);
}
return $escaped_array;
}
+ // This is basically a bug fix for queries that use MAX, MIN, etc.
+ // If a parenthesis is found we know that we do not need to
+ // escape the data or add a prefix. There's probably a more graceful
+ // way to deal with this, but I'm not thinking of it -- Rick
+ //
+ // Added exception for single quotes as well, we don't want to alter
+ // literal strings. -- Narf
+ if (strcspn($item, "()'") !== strlen($item))
+ {
+ return $item;
+ }
+
// Convert tabs or multiple spaces into single spaces
- $item = preg_replace('/[\t ]+/', ' ', $item);
+ $item = preg_replace('/\s+/', ' ', trim($item));
// If the item has an alias declaration we remove it and set it aside.
- // Basically we remove everything to the right of the first space
- if (strpos($item, ' ') !== FALSE)
+ // Note: strripos() is used in order to support spaces in table names
+ if ($offset = strripos($item, ' AS '))
{
- $alias = strstr($item, ' ');
- $item = substr($item, 0, - strlen($alias));
+ $alias = ($protect_identifiers)
+ ? substr($item, $offset, 4).$this->escape_identifiers(substr($item, $offset + 4))
+ : substr($item, $offset);
+ $item = substr($item, 0, $offset);
}
- else
+ elseif ($offset = strrpos($item, ' '))
{
- $alias = '';
+ $alias = ($protect_identifiers)
+ ? ' '.$this->escape_identifiers(substr($item, $offset + 1))
+ : substr($item, $offset);
+ $item = substr($item, 0, $offset);
}
-
- // This is basically a bug fix for queries that use MAX, MIN, etc.
- // If a parenthesis is found we know that we do not need to
- // escape the data or add a prefix. There's probably a more graceful
- // way to deal with this, but I'm not thinking of it -- Rick
- if (strpos($item, '(') !== FALSE)
+ else
{
- return $item.$alias;
+ $alias = '';
}
// Break the string apart if it contains periods, then insert the table prefix
@@ -1291,12 +1869,15 @@ class CI_DB_driver {
// with an alias. While we're at it, we will escape the components
if (strpos($item, '.') !== FALSE)
{
- $parts = explode('.', $item);
+ $parts = explode('.', $item);
// Does the first segment of the exploded item match
- // one of the aliases previously identified? If so,
+ // one of the aliases previously identified? If so,
// we have nothing more to do other than escape the item
- if (in_array($parts[0], $this->ar_aliased_tables))
+ //
+ // NOTE: The ! empty() condition prevents this method
+ // from breaking when QB isn't enabled.
+ if ( ! empty($this->qb_aliased_tables) && in_array($parts[0], $this->qb_aliased_tables))
{
if ($protect_identifiers === TRUE)
{
@@ -1304,17 +1885,18 @@ class CI_DB_driver {
{
if ( ! in_array($val, $this->_reserved_identifiers))
{
- $parts[$key] = $this->_escape_identifiers($val);
+ $parts[$key] = $this->escape_identifiers($val);
}
}
$item = implode('.', $parts);
}
+
return $item.$alias;
}
- // Is there a table prefix defined in the config file? If not, no need to do anything
- if ($this->dbprefix != '')
+ // Is there a table prefix defined in the config file? If not, no need to do anything
+ if ($this->dbprefix !== '')
{
// We now add the table prefix based on some logic.
// Do we have 4 segments (hostname.database.table.column)?
@@ -1338,19 +1920,18 @@ class CI_DB_driver {
// This flag is set when the supplied $item does not contain a field name.
// This can happen when this function is being called from a JOIN.
- if ($field_exists == FALSE)
+ if ($field_exists === FALSE)
{
$i++;
}
// Verify table prefix and replace if necessary
- if ($this->swap_pre != '' && strncmp($parts[$i], $this->swap_pre, strlen($this->swap_pre)) === 0)
+ if ($this->swap_pre !== '' && strpos($parts[$i], $this->swap_pre) === 0)
{
- $parts[$i] = preg_replace("/^".$this->swap_pre."(\S+?)/", $this->dbprefix."\\1", $parts[$i]);
+ $parts[$i] = preg_replace('/^'.$this->swap_pre.'(\S+?)/', $this->dbprefix.'\\1', $parts[$i]);
}
-
// We only add the table prefix if it does not already exist
- if (substr($parts[$i], 0, strlen($this->dbprefix)) != $this->dbprefix)
+ elseif (strpos($parts[$i], $this->dbprefix) !== 0)
{
$parts[$i] = $this->dbprefix.$parts[$i];
}
@@ -1361,31 +1942,30 @@ class CI_DB_driver {
if ($protect_identifiers === TRUE)
{
- $item = $this->_escape_identifiers($item);
+ $item = $this->escape_identifiers($item);
}
return $item.$alias;
}
- // Is there a table prefix? If not, no need to insert it
- if ($this->dbprefix != '')
+ // Is there a table prefix? If not, no need to insert it
+ if ($this->dbprefix !== '')
{
// Verify table prefix and replace if necessary
- if ($this->swap_pre != '' && strncmp($item, $this->swap_pre, strlen($this->swap_pre)) === 0)
+ if ($this->swap_pre !== '' && strpos($item, $this->swap_pre) === 0)
{
- $item = preg_replace("/^".$this->swap_pre."(\S+?)/", $this->dbprefix."\\1", $item);
+ $item = preg_replace('/^'.$this->swap_pre.'(\S+?)/', $this->dbprefix.'\\1', $item);
}
-
// Do we prefix an item with no segments?
- if ($prefix_single == TRUE AND substr($item, 0, strlen($this->dbprefix)) != $this->dbprefix)
+ elseif ($prefix_single === TRUE && strpos($item, $this->dbprefix) !== 0)
{
$item = $this->dbprefix.$item;
}
}
- if ($protect_identifiers === TRUE AND ! in_array($item, $this->_reserved_identifiers))
+ if ($protect_identifiers === TRUE && ! in_array($item, $this->_reserved_identifiers))
{
- $item = $this->_escape_identifiers($item);
+ $item = $this->escape_identifiers($item);
}
return $item.$alias;
@@ -1394,9 +1974,8 @@ class CI_DB_driver {
// --------------------------------------------------------------------
/**
- * Dummy method that allows Active Record class to be disabled
- *
- * This function is used extensively by every db driver.
+ * Dummy method that allows Query Builder class to be disabled
+ * and keep count_all() working.
*
* @return void
*/
@@ -1405,6 +1984,3 @@ class CI_DB_driver {
}
}
-
-/* End of file DB_driver.php */
-/* Location: ./system/database/DB_driver.php */ \ No newline at end of file