diff options
Diffstat (limited to 'system/database/DB_driver.php')
| -rw-r--r-- | system/database/DB_driver.php | 407 |
1 files changed, 172 insertions, 235 deletions
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php index 271a70ec4..025441f90 100644 --- a/system/database/DB_driver.php +++ b/system/database/DB_driver.php @@ -1,13 +1,13 @@ -<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); +<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.1.6 or newer * * NOTICE OF LICENSE - * + * * Licensed under the Open Software License version 3.0 - * + * * This source file is subject to the Open Software License (OSL 3.0) that is * bundled with this package in the files license.txt / license.rst. It is * also available through the world wide web at this URL: @@ -25,8 +25,6 @@ * @filesource */ -// ------------------------------------------------------------------------ - /** * Database Driver Class * @@ -42,54 +40,44 @@ */ 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) + public $dsn; + public $username; + public $password; + public $hostname; + public $database; + public $dbdriver = 'mysql'; + public $dbprefix = ''; + public $char_set = 'utf8'; + public $dbcollat = 'utf8_general_ci'; + public $autoinit = TRUE; // Whether to automatically initialize the DB + public $swap_pre = ''; + public $port = ''; + public $pconnect = FALSE; + public $conn_id = FALSE; + public $result_id = FALSE; + public $db_debug = FALSE; + public $benchmark = 0; + public $query_count = 0; + public $bind_marker = '?'; + public $save_queries = TRUE; + public $queries = array(); + public $query_times = array(); + public $data_cache = array(); + + public $trans_enabled = TRUE; + public $trans_strict = TRUE; + protected $_trans_depth = 0; + protected $_trans_status = TRUE; // Used with transactions to determine if a rollback should occur + + public $cache_on = FALSE; + public $cachedir = ''; + public $cache_autodel = FALSE; + public $CACHE; // The cache class object + + protected $_protect_identifiers = TRUE; + protected $_reserved_identifiers = array('*'); // Identifiers that should NOT be escaped + + public function __construct($params) { if (is_array($params)) { @@ -185,20 +173,19 @@ class CI_DB_driver { /** * Set client character set * - * @access public * @param string * @param string - * @return resource + * @return bool */ - function db_set_charset($charset, $collation) + public function db_set_charset($charset, $collation = '') { - if ( ! $this->_db_set_charset($this->char_set, $this->dbcollat)) + if (method_exists($this, '_db_set_charset') && ! $this->_db_set_charset($charset, $collation)) { - log_message('error', 'Unable to set database connection charset: '.$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; @@ -212,10 +199,9 @@ class CI_DB_driver { /** * The name of the platform in use (mysql, mssql, etc...) * - * @access public * @return string */ - function platform() + public function platform() { return $this->dbdriver; } @@ -223,36 +209,40 @@ class CI_DB_driver { // -------------------------------------------------------------------- /** - * Database Version Number. Returns a string containing the - * version of the database being used + * Database version number + * + * Returns a string containing the version of the database being used. + * Most drivers will override this method. * - * @access public * @return string */ - function version() + public function version() { - if (FALSE === ($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. - $driver_version_exceptions = array('oci8', 'sqlite', 'cubrid', 'pdo', 'mysqli'); - - if (in_array($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); + $query = $query->row(); + return $this->data_cache['version'] = $query->ver; + } + + // -------------------------------------------------------------------- + + /** + * Version number query string + * + * @return string + */ + protected function _version() + { + return 'SELECT VERSION() AS ver'; } // -------------------------------------------------------------------- @@ -261,17 +251,16 @@ 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 $db_debug variable is set to TRUE * will raise an error. * - * @access public * @param string An SQL query string * @param array An array of binding data * @return mixed */ - function query($sql, $binds = FALSE, $return_object = TRUE) + public function query($sql, $binds = FALSE, $return_object = TRUE) { if ($sql == '') { @@ -290,7 +279,13 @@ class CI_DB_driver { $sql = preg_replace("/(\W)".$this->swap_pre."(\S+?)/", "\\1".$this->dbprefix."\\2", $sql); } - // Is query caching enabled? If the query is a "read type" + // Compile binds if needed + if ($binds !== FALSE) + { + $sql = $this->compile_binds($sql, $binds); + } + + // Is query caching enabled? If the query is a "read type" // we will load the caching class and return the previously // cached query if it exists if ($this->cache_on == TRUE AND stristr($sql, 'SELECT')) @@ -305,12 +300,6 @@ class CI_DB_driver { } } - // Compile binds if needed - if ($binds !== FALSE) - { - $sql = $this->compile_binds($sql, $binds); - } - // Save the query for debugging if ($this->save_queries == TRUE) { @@ -331,30 +320,28 @@ class CI_DB_driver { // This will trigger a rollback if transactions are being used $this->_trans_status = FALSE; - // 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(); + // 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_msg); + log_message('error', 'Query error: '.$error['message']); if ($this->db_debug) { // 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(); // Display errors return $this->display_error( - array( - 'Error Number: '.$error_no, - $error_msg, - $sql - ) - ); + array( + 'Error Number: '.$error['code'], + $error['message'], + $sql + ) + ); } return FALSE; @@ -395,21 +382,9 @@ class CI_DB_driver { } // 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 @@ -442,10 +417,9 @@ 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'; @@ -462,15 +436,14 @@ 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) { @@ -486,10 +459,9 @@ 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() { $this->trans_enabled = FALSE; } @@ -503,10 +475,9 @@ class CI_DB_driver { * If strict mode is disabled, each group is treated autonomously, meaning * a failure of one group will not affect any others * - * @access public * @return void */ - function trans_strict($mode = TRUE) + public function trans_strict($mode = TRUE) { $this->trans_strict = is_bool($mode) ? $mode : TRUE; } @@ -516,10 +487,9 @@ class CI_DB_driver { /** * Start Transaction * - * @access public * @return void */ - function trans_start($test_mode = FALSE) + public function trans_start($test_mode = FALSE) { if ( ! $this->trans_enabled) { @@ -542,10 +512,9 @@ class CI_DB_driver { /** * Complete Transaction * - * @access public * @return bool */ - function trans_complete() + public function trans_complete() { if ( ! $this->trans_enabled) { @@ -589,10 +558,9 @@ 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 $this->_trans_status; } @@ -602,12 +570,11 @@ class CI_DB_driver { /** * Compile Bindings * - * @access public * @param string the sql statement * @param array an array of bind data * @return string */ - function compile_binds($sql, $binds) + public function compile_binds($sql, $binds) { if (strpos($sql, $this->bind_marker) === FALSE) { @@ -645,17 +612,12 @@ class CI_DB_driver { /** * Determines if a query is a "write" type. * - * @access public * @param string An SQL query string - * @return boolean + * @return bool */ - function is_write_type($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 DATA|COPY|ALTER|RENAME|GRANT|REVOKE|LOCK|UNLOCK|OPTIMIZE|REINDEX)\s+/i', $sql); } // -------------------------------------------------------------------- @@ -663,11 +625,10 @@ class CI_DB_driver { /** * Calculate the aggregate query elapsed time * - * @access public - * @param integer The number of decimal places - * @return integer + * @param int The number of decimal places + * @return int */ - function elapsed_time($decimals = 6) + public function elapsed_time($decimals = 6) { return number_format($this->benchmark, $decimals); } @@ -677,10 +638,9 @@ class CI_DB_driver { /** * Returns the total number of queries * - * @access public - * @return integer + * @return int */ - function total_queries() + public function total_queries() { return $this->query_count; } @@ -690,10 +650,9 @@ class CI_DB_driver { /** * Returns the last query that was executed * - * @access public - * @return void + * @return string */ - function last_query() + public function last_query() { return end($this->queries); } @@ -706,11 +665,10 @@ 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($str)) { @@ -736,11 +694,10 @@ class CI_DB_driver { * Calls the individual driver for platform * specific escaping for LIKE conditions * - * @access public * @param string * @return mixed */ - function escape_like_str($str) + public function escape_like_str($str) { return $this->escape_str($str, TRUE); } @@ -750,14 +707,13 @@ class CI_DB_driver { /** * 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 * @return string */ - function primary($table = '') + public function primary($table = '') { $fields = $this->list_fields($table); @@ -774,10 +730,9 @@ class CI_DB_driver { /** * Returns an array of table names * - * @access public * @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'])) @@ -815,7 +770,7 @@ class CI_DB_driver { } $this->data_cache['table_names'] = $retval; - + return $this->data_cache['table_names']; } @@ -823,12 +778,12 @@ class CI_DB_driver { /** * Determine if a particular table exists - * @access public - * @return boolean + * + * @return bool */ - function table_exists($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), $this->list_tables()); } // -------------------------------------------------------------------- @@ -836,11 +791,10 @@ class CI_DB_driver { /** * Fetch MySQL Field Names * - * @access public * @param string the table name * @return array */ - function list_fields($table = '') + public function list_fields($table = '') { // Is there a cached result? if (isset($this->data_cache['field_names'][$table])) @@ -889,12 +843,12 @@ class CI_DB_driver { /** * Determine if a particular field exists - * @access public + * * @param string * @param string - * @return boolean + * @return bool */ - function field_exists($field_name, $table_name) + public function field_exists($field_name, $table_name) { return ( ! in_array($field_name, $this->list_fields($table_name))) ? FALSE : TRUE; } @@ -904,11 +858,10 @@ class CI_DB_driver { /** * Returns an object with field data * - * @access public * @param string the table name * @return object */ - function field_data($table = '') + public function field_data($table = '') { if ($table == '') { @@ -919,7 +872,7 @@ class CI_DB_driver { return FALSE; } - $query = $this->query($this->_field_data($this->_protect_identifiers($table, TRUE, NULL, FALSE))); + $query = $this->query($this->_field_data($this->protect_identifiers($table, TRUE, NULL, FALSE))); return $query->field_data(); } @@ -929,12 +882,11 @@ class CI_DB_driver { /** * Generate an insert string * - * @access public * @param string the table upon which the query will be performed * @param array an associative array data of key/values * @return string */ - function insert_string($table, $data) + public function insert_string($table, $data) { $fields = array(); $values = array(); @@ -945,7 +897,7 @@ class CI_DB_driver { $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, $values); } // -------------------------------------------------------------------- @@ -953,23 +905,22 @@ class CI_DB_driver { /** * Generate an update string * - * @access public * @param string the table upon which the query will be performed * @param array an associative array data of key/values * @param mixed the "where" statement * @return string */ - function update_string($table, $data, $where) + public function update_string($table, $data, $where) { if ($where == '') { - return false; + return FALSE; } $fields = array(); foreach ($data as $key => $val) { - $fields[$this->_protect_identifiers($key)] = $this->escape($val); + $fields[$this->protect_identifiers($key)] = $this->escape($val); } if ( ! is_array($where)) @@ -982,7 +933,7 @@ class CI_DB_driver { foreach ($where as $key => $val) { $prefix = (count($dest) == 0) ? '' : ' AND '; - $key = $this->_protect_identifiers($key); + $key = $this->protect_identifiers($key); if ($val !== '') { @@ -998,7 +949,7 @@ class CI_DB_driver { } } - return $this->_update($this->_protect_identifiers($table, TRUE, NULL, FALSE), $fields, $dest); + return $this->_update($this->protect_identifiers($table, TRUE, NULL, FALSE), $fields, $dest); } // -------------------------------------------------------------------- @@ -1006,11 +957,10 @@ class CI_DB_driver { /** * Tests whether the string has an SQL operator * - * @access private * @param string * @return bool */ - function _has_operator($str) + protected function _has_operator($str) { $str = trim($str); if ( ! preg_match("/(\s|<|>|!|=|is null|is not null)/i", $str)) @@ -1026,12 +976,11 @@ class CI_DB_driver { /** * Enables a native PHP function to be run, using a platform agnostic wrapper. * - * @access public * @param string the function name * @param mixed any parameters needed by the function * @return mixed */ - function call_function($function) + public function call_function($function) { $driver = ($this->dbdriver == 'postgre') ? 'pg_' : $this->dbdriver.'_'; @@ -1068,11 +1017,10 @@ class CI_DB_driver { /** * Set Cache Directory Path * - * @access public * @param string the path to the cache directory * @return void */ - function cache_set_path($path = '') + public function cache_set_path($path = '') { $this->cachedir = $path; } @@ -1082,10 +1030,9 @@ 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; @@ -1096,10 +1043,9 @@ class CI_DB_driver { /** * Disable Query Caching * - * @access public - * @return void + * @return bool cache_on value */ - function cache_off() + public function cache_off() { $this->cache_on = FALSE; return FALSE; @@ -1111,10 +1057,9 @@ class CI_DB_driver { /** * Delete the cache files associated with a particular URI * - * @access public - * @return void + * @return bool */ - function cache_delete($segment_one = '', $segment_two = '') + public function cache_delete($segment_one = '', $segment_two = '') { if ( ! $this->_cache_init()) { @@ -1128,10 +1073,9 @@ class CI_DB_driver { /** * Delete All cache files * - * @access public - * @return void + * @return bool */ - function cache_delete_all() + public function cache_delete_all() { if ( ! $this->_cache_init()) { @@ -1146,10 +1090,9 @@ class CI_DB_driver { /** * Initialize the Cache Class * - * @access private - * @return void + * @return bool */ - function _cache_init() + protected function _cache_init() { if (is_object($this->CACHE) AND class_exists('CI_DB_Cache')) { @@ -1173,10 +1116,9 @@ 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)) { @@ -1190,13 +1132,12 @@ 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 + * @param bool whether to localize the message * @return string sends the application/error_db.php template */ - function display_error($error = '', $swap = '', $native = FALSE) + public function display_error($error = '', $swap = '', $native = FALSE) { $LANG =& load_class('Lang', 'core'); $LANG->load('db'); @@ -1240,27 +1181,11 @@ class CI_DB_driver { /** * Protect Identifiers * - * This function adds backticks if appropriate based on db type - * - * @access private - * @param mixed the item to escape - * @return mixed the item with backticks - */ - function protect_identifiers($item, $prefix_single = FALSE) - { - return $this->_protect_identifiers($item, $prefix_single); - } - - // -------------------------------------------------------------------- - - /** - * Protect Identifiers - * * This function is used extensively by the Active Record class, and by * a couple functions in this class. * It takes a column or table name (optionally with an alias) and inserts * the table prefix onto it. Some logic is necessary in order to deal with - * column names that include the path. Consider a query like this: + * column names that include the path. Consider a query like this: * * SELECT * FROM hostname.database.table.column AS c FROM hostname.database.table * @@ -1273,14 +1198,13 @@ class CI_DB_driver { * insert the table prefix (if it exists) in the proper position, and escape only * the correct identifiers. * - * @access private * @param string * @param bool * @param mixed * @param bool * @return string */ - function _protect_identifiers($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)) { @@ -1290,10 +1214,9 @@ 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); } return $escaped_array; @@ -1313,7 +1236,7 @@ class CI_DB_driver { // This is basically a bug fix for queries that use MAX, MIN, etc. // If a parenthesis is found we know that we do not need to - // escape the data or add a prefix. There's probably a more graceful + // escape the data or add a prefix. There's probably a more graceful // way to deal with this, but I'm not thinking of it -- Rick if (strpos($item, '(') !== FALSE) { @@ -1328,7 +1251,7 @@ class CI_DB_driver { $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)) { @@ -1347,7 +1270,7 @@ class CI_DB_driver { return $item.$alias; } - // Is there a table prefix defined in the config file? If not, no need to do anything + // 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. @@ -1401,7 +1324,7 @@ class CI_DB_driver { return $item.$alias; } - // Is there a table prefix? If not, no need to insert it + // Is there a table prefix? If not, no need to insert it if ($this->dbprefix != '') { // Verify table prefix and replace if necessary @@ -1424,6 +1347,20 @@ class CI_DB_driver { return $item.$alias; } + + // -------------------------------------------------------------------- + + /** + * Dummy method that allows Active Record class to be disabled + * + * This function is used extensively by every db driver. + * + * @return void + */ + protected function _reset_select() + { + } + } /* End of file DB_driver.php */ |