<?php if (!defined('BASEPATH')) exit('No direct script access allowed'); /** * Code Igniter * * An open source application development framework for PHP 4.3.2 or newer * * @package CodeIgniter * @author Rick Ellis * @copyright Copyright (c) 2006, pMachine, Inc. * @license http://www.codeignitor.com/user_guide/license.html * @link http://www.codeigniter.com * @since Version 1.0 * @filesource */ // ------------------------------------------------------------------------ /** * Database Driver Class * * This is the platform-independent base DB implementation class. * This class will not be called directly. Rather, the adapter * class for the specific database will extend and instantiate it. * * @package CodeIgniter * @subpackage Drivers * @category Database * @author Rick Ellis * @link http://www.codeigniter.com/user_guide/database/ */ class CI_DB_driver { var $username; var $password; var $hostname; var $database; var $dbdriver = 'mysql'; var $dbprefix = ''; 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 $queries = array(); var $data_cache = array(); var $trans_enabled = TRUE; var $_trans_depth = 0; var $_trans_failure = FALSE; // 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 // These are use with Oracle var $stmt_id; var $curs_id; var $limit_used; /** * Constructor. Accepts one parameter containing the database * connection settings. * * Database settings can be passed as discreet * parameters or as a data source name in the first * parameter. DSNs must have this prototype: * $dsn = 'driver://username:password@hostname/database'; * * @param mixed. Can be an array or a DSN string */ function CI_DB_driver($params) { $this->initialize($params); log_message('debug', 'Database Driver Class Initialized'); } // -------------------------------------------------------------------- /** * Initialize Database Settings * * @access private Called by the constructor * @param mixed * @return void */ function initialize($params = '') { if (is_array($params)) { $defaults = array( 'hostname' => '', 'username' => '', 'password' => '', 'database' => '', 'conn_id' => FALSE, 'dbdriver' => 'mysql', 'dbprefix' => '', 'port' => '', 'pconnect' => FALSE, 'db_debug' => FALSE, 'cachedir' => '', 'cache_on' => FALSE ); foreach ($defaults as $key => $val) { $this->$key = ( ! isset($params[$key])) ? $val : $params[$key]; } } elseif (strpos($params, '://')) { if (FALSE === ($dsn = @parse_url($params))) { log_message('error', 'Invalid DB Connection String'); if ($this->db_debug) { return $this->display_error('db_invalid_connection_str'); } return FALSE; } $this->hostname = ( ! isset($dsn['host'])) ? '' : rawurldecode($dsn['host']); $this->username = ( ! isset($dsn['user'])) ? '' : rawurldecode($dsn['user']); $this->password = ( ! isset($dsn['pass'])) ? '' : rawurldecode($dsn['pass']); $this->database = ( ! isset($dsn['path'])) ? '' : rawurldecode(substr($dsn['path'], 1)); } // If an existing DB connection resource is supplied // there is no need to connect and select the database if (is_resource($this->conn_id)) { return TRUE; } // Connect to the database $this->conn_id = ($this->pconnect == FALSE) ? $this->db_connect() : $this->db_pconnect(); // No connection? Throw an error if ( ! $this->conn_id) { log_message('error', 'Unable to connect to the database'); if ($this->db_debug) { $this->display_error('db_unable_to_connect'); } return FALSE; } // Select the database if ($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); } return FALSE; } } return TRUE; } // -------------------------------------------------------------------- /** * The name of the platform in use (mysql, mssql, etc...) * * @access public * @return string */ function platform() { return $this->dbdriver; } // -------------------------------------------------------------------- /** * Database Version Number. Returns a string containing the * version of the database being used * * @access public * @return string */ function version() { if (FALSE === ($sql = $this->_version())) { if ($this->db_debug) { return $this->display_error('db_unsupported_function'); } return FALSE; } if ($this->dbdriver == 'oci8') { return $sql; } $query = $this->query($sql); $row = $query->row(); return $row->ver; } // -------------------------------------------------------------------- /** * 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 * 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, $return_object = TRUE) { if ($sql == '') { if ($this->db_debug) { log_message('error', 'Invalid query: '.$sql); return $this->display_error('db_invalid_query'); } return FALSE; } // Is query caching enabled? If the query is a "read type" // we will load the caching class and return the previously // cached query if it exists if ($this->cache_on == TRUE AND stristr($sql, 'SELECT')) { if ($this->_cache_init()) { $this->load_rdriver(); if (FALSE !== ($cache = $this->CACHE->read($sql))) { return $cache; } } } // Compile binds if needed if ($binds !== FALSE) { $sql = $this->compile_binds($sql, $binds); } // Save the query for debugging $this->queries[] = $sql; // Start the Query Timer $time_start = list($sm, $ss) = explode(' ', microtime()); // Run the Query if (FALSE === ($this->result_id = $this->simple_query($sql))) { // This will trigger a rollback if transactions are being used $this->_trans_failure = TRUE; if ($this->db_debug) { log_message('error', 'Query error: '.$this->_error_message()); return $this->display_error( array( 'Error Number: '.$this->_error_number(), $this->_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); // 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($sql) === TRUE) { // If caching is enabled we'll auto-cleanup any // existing files related to this particular URI if ($this->cache_on == TRUE AND $this->cache_autodel == TRUE AND $this->_cache_init()) { $this->CACHE->delete(); } return TRUE; } // Return TRUE if we don't need to create a result object // Currently only the Oracle driver uses this when stored // procedures are used if ($return_object !== TRUE) { return TRUE; } // Load and instantiate the result driver $driver = $this->load_rdriver(); $RES = new $driver(); $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 = $this->limit_used; } // Is query caching enabled? If so, we'll serialize the // result object and save it to a cache file. if ($this->cache_on == TRUE AND $this->_cache_init()) { // We'll create a new instance of the result object // only without the platform specific driver since // we can't use it with cached data (the query result // 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->result_object = $RES->result_object(); $CR->result_array = $RES->result_array(); // Reset these since cached objects can not utilize resource IDs. $CR->conn_id = NULL; $CR->result_id = NULL; $this->CACHE->write($sql, $CR); } return $RES; } // -------------------------------------------------------------------- /** * Load the result drivers * * @access public * @return string the name of the result class */ function load_rdriver() { $driver = 'CI_DB_'.$this->dbdriver.'_result'; if ( ! class_exists($driver)) { include_once(BASEPATH.'database/DB_result'.EXT); include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result'.EXT); } return $driver; } // -------------------------------------------------------------------- /** * Simple Query * This is a simplified version of the query() function. Internally * we only use it when running transaction commands since they do * not require all the features of the main query() function. * * @access public * @param string the sql query * @return mixed */ function simple_query($sql) { if ( ! $this->conn_id) { $this->initialize(); } return $this->_execute($sql); } // -------------------------------------------------------------------- /** * Disable Transactions * This permits transactions to be disabled at run-time. * * @access public * @return void */ function trans_off() { $this->trans_enabled = FALSE; } // -------------------------------------------------------------------- /** * Start Transaction * * @access public * @return void */ function trans_start($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); } // -------------------------------------------------------------------- /** * Complete Transaction * * @access public * @return bool */ 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) { $this->_trans_depth -= 1; return TRUE; } // The query() function will set this flag to TRUE in the event that a query failed if ($this->_trans_failure === TRUE) { $this->trans_rollback(); if ($this->db_debug) { return $this->display_error('db_transaction_failure'); } return FALSE; } $this->trans_commit(); return TRUE; } // -------------------------------------------------------------------- /** * Lets you retrieve the transaction flag to determine if it has failed * * @access public * @return bool */ function trans_status() { return $this->_trans_failure; } // -------------------------------------------------------------------- /** * Compile Bindings * * @access public * @param string the sql statement * @param array an array of bind data * @return string */ function compile_binds($sql, $binds) { if (FALSE === strpos($sql, $this->bind_marker)) { return $sql; } if ( ! is_array($binds)) { $binds = array($binds); } foreach ($binds as $val) { $val = $this->escape($val); // Just in case the replacement string contains the bind // character we'll temporarily replace it with a marker $val = str_replace($this->bind_marker, '{%bind_marker%}', $val); $sql = preg_replace("#".preg_quote($this->bind_marker, '#')."#", str_replace('$', '\$', $val), $sql, 1); } return str_replace('{%bind_marker%}', $this->bind_marker, $sql); } // -------------------------------------------------------------------- /** * Determines if a query is a "write" type. * * @access public * @param string An SQL query string * @return boolean */ function is_write_type($sql) { if ( ! preg_match('/^\s*"?(INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|LOAD DATA|COPY|ALTER|GRANT|REVOKE|LOCK|UNLOCK)\s+/i', $sql)) { return FALSE; } return TRUE; } // -------------------------------------------------------------------- /** * Calculate the aggregate query elapsed time * * @access public * @param integer The number of decimal places * @return integer */ function elapsed_time($decimals = 6) { return number_format($this->benchmark, $decimals); } // -------------------------------------------------------------------- /** * Returns the total number of queries * * @access public * @return integer */ function total_queries() { return $this->query_count; } // -------------------------------------------------------------------- /** * Returns the last query that was executed * * @access public * @return void */ function last_query() { return end($this->queries); } // -------------------------------------------------------------------- /** * "Smart" Escape String * * Escapes data based on type * Sets boolean and null types * * @access public * @param string * @return integer */ function escape($str) { switch (gettype($str)) { case 'string' : $str = "'".$this->escape_str($str)."'"; break; case 'boolean' : $str = ($str === FALSE) ? 0 : 1; break; default : $str = ($str === NULL) ? 'NULL' : $str; break; } return $str; } // -------------------------------------------------------------------- /** * Primary * * Retrieves the primary key. It assumes that the row in the first * position is the primary key * * @access public * @param string the table name * @return string */ function primary($table = '') { $fields = $this->list_fields($table); if ( ! is_array($fields)) { return FALSE; } return current($fields); } // -------------------------------------------------------------------- /** * Returns an array of table names * * @access public * @return array */ function list_tables() { // Is there a cached result? if (isset($this->data_cache['table_names'])) { return $this->data_cache['table_names']; } if (FALSE === ($sql = $this->_list_tables())) { if ($this->db_debug) { return $this->display_error('db_unsupported_function'); } return FALSE; } $retval = array(); $query = $this->query($sql); if ($query->num_rows() > 0) { foreach($query->result_array() as $row) { if (isset($row['TABLE_NAME'])) { $retval[] = $row['TABLE_NAME']; } else { $retval[] = array_shift($row); } } } $this->data_cache['table_names'] = $retval; return $this->data_cache['table_names']; } // -------------------------------------------------------------------- /** * Determine if a particular table exists * @access public * @return boolean */ function table_exists($table_name) { return ( ! in_array($this->dbprefix.$table_name, $this->list_tables())) ? FALSE : TRUE; } // -------------------------------------------------------------------- /** * Fetch MySQL Field Names * * @access public * @param string the table name * @return array */ function list_fields($table = '') { // Is there a cached result? if (isset($this->data_cache['field_names'][$table])) { 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 = $this->_list_columns($this->dbprefix.$table))) { if ($this->db_debug) { return $this->display_error('db_unsupported_function'); } return FALSE; } $query = $this->query($sql); $retval = array(); foreach($query->result_array() as $row) { if (isset($row['COLUMN_NAME'])) { $retval[] = $row['COLUMN_NAME']; } else { $retval[] = current($row); } } $this->data_cache['field_names'][$table] = $retval; return $this->data_cache['field_names'][$table]; } // -------------------------------------------------------------------- /** * Determine if a particular field exists * @access public * @param string * @param string * @return boolean */ function field_exists($field_name, $table_name) { return ( ! in_array($field_name, $this->list_fields($table_name))) ? FALSE : TRUE; } // -------------------------------------------------------------------- /** * DEPRECATED - use list_fields() */ function field_names($table = '') { return $this->list_fields($table); } // -------------------------------------------------------------------- /** * Returns an object with field data * * @access public * @param string the table name * @return object */ function field_data($table = '') { if ($table == '') { if ($this->db_debug) { return $this->display_error('db_field_param_missing'); } return FALSE; } $query = $this->query($this->_field_data($this->dbprefix.$table)); return $query->field_data(); } // -------------------------------------------------------------------- /** * Generate an insert string * * @access public * @param string the table upon which the query will be performed * @param array an associative array data of key/values * @return string */ function insert_string($table, $data) { $fields = array(); $values = array(); foreach($data as $key => $val) { $fields[] = $key; $values[] = $this->escape($val); } return $this->_insert($this->dbprefix.$table, $fields, $values); } // -------------------------------------------------------------------- /** * Generate an update string * * @access public * @param string the table upon which the query will be performed * @param array an associative array data of key/values * @param mixed the "where" statement * @return string */ function update_string($table, $data, $where) { if ($where == '') return false; $fields = array(); foreach($data as $key => $val) { $fields[$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 .= ' ='; } $val = ' '.$this->escape($val); } $dest[] = $prefix.$key.$val; } } return $this->_update($this->dbprefix.$table, $fields, $dest); } // -------------------------------------------------------------------- /** * Enables a native PHP function to be run, using a platform agnostic wrapper. * * @access public * @param string the function name * @param mixed any parameters needed by the function * @return mixed */ function call_function($function) { $driver = ($this->dbdriver == 'postgre') ? 'pg_' : $this->dbdriver.'_'; if (FALSE === strpos($driver, $function)) { $function = $driver.$function; } if ( ! function_exists($function)) { if ($this->db_debug) { return $this->display_error('db_unsupported_function'); } return FALSE; } else { $args = (func_num_args() > 1) ? array_splice(func_get_args(), 1) : null; return call_user_func_array($function, $args); } } // -------------------------------------------------------------------- /** * Set Cache Directory Path * * @access public * @param string the path to the cache directory * @return void */ function cache_set_path($path = '') { $this->cachedir = $path; } // -------------------------------------------------------------------- /** * Enable Query Caching * * @access public * @return void */ function cache_on() { $this->cache_on = TRUE; return TRUE; } // -------------------------------------------------------------------- /** * Disable Query Caching * * @access public * @return void */ function cache_off() { $this->cache_on = FALSE; return FALSE; } // -------------------------------------------------------------------- /** * Delete the cache files associated with a particular URI * * @access public * @return void */ function cache_delete($segment_one = '', $segment_two = '') { if ( ! $this->_cache_init()) { return FALSE; } return $this->CACHE->delete($segment_one, $segment_two); } // -------------------------------------------------------------------- /** * Delete All cache files * * @access public * @return void */ function cache_delete_all() { if ( ! $this->_cache_init()) { return FALSE; } return $this->CACHE->delete_all(); } // -------------------------------------------------------------------- /** * Initialize the Cache Class * * @access private * @return void */ function _cache_init() { if (is_object($this->CACHE) AND class_exists('CI_DB_Cache')) { return TRUE; } if ( ! @include(BASEPATH.'database/DB_cache'.EXT)) { return $this->cache_off(); } $this->CACHE = new CI_DB_Cache; return TRUE; } // -------------------------------------------------------------------- /** * Close DB Connection * * @access public * @return void */ function close() { if (is_resource($this->conn_id)) { $this->_close($this->conn_id); } $this->conn_id = FALSE; } // -------------------------------------------------------------------- /** * Display an error message * * @access public * @param string the error message * @param string any "swap" values * @param boolean whether to localize the message * @return string sends the application/error_db.php template */ function display_error($error = '', $swap = '', $native = FALSE) { $LANG = new CI_Language(); $LANG->load('db'); $heading = 'MySQL Error'; if ($native == TRUE) { $message = $error; } else { $message = ( ! is_array($error)) ? array(str_replace('%s', $swap, $LANG->line($error))) : $error; } if ( ! class_exists('CI_Exceptions')) { include(BASEPATH.'libraries/Exceptions'.EXT); } $error = new CI_Exceptions(); echo $error->show_error('An Error Was Encountered', $message, 'error_db'); exit; } } ?>