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+<?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 $trans_enabled = TRUE;
+ var $_trans_depth = 0;
+ var $_trans_failure = FALSE; // Used with transactions to determine if a rollback should occur
+
+ // 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))
+ {
+ foreach (array('hostname' => '', 'username' => '', 'password' => '', 'database' => '', 'dbdriver' => 'mysql', 'dbprefix' => '', 'port' => '', 'pconnect' => FALSE, 'db_debug' => FALSE) 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($dsn['path'], 1));
+ }
+
+ if ($this->pconnect == FALSE)
+ {
+ $this->conn_id = $this->db_connect();
+ }
+ else
+ {
+ $this->conn_id = $this->db_pconnect();
+ }
+
+ if ( ! $this->conn_id)
+ {
+ log_message('error', 'Unable to connect to the database');
+
+ if ($this->db_debug)
+ {
+ $this->display_error('db_unable_to_connect');
+ }
+ }
+ else
+ {
+ 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);
+ }
+ }
+ }
+ }
+
+
+ // --------------------------------------------------------------------
+
+ /**
+ * 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 $this->display_error('db_invalid_query');
+ }
+ return FALSE;
+ }
+
+ // Compile binds if needed
+ if ($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($sql) === TRUE)
+ {
+ return TRUE;
+ }
+
+ // Return TRUE if we don't need to create a result object
+ // Currently only the Oracle driver uses this when stored
+ // procedures are used
+ if ($return_object !== TRUE)
+ {
+ return TRUE;
+ }
+
+ // Define the result driver name
+ $result = 'CI_DB_'.$this->dbdriver.'_result';
+
+ // Load the result classes
+ if ( ! class_exists($result))
+ {
+ include_once(BASEPATH.'database/DB_result'.EXT);
+ include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result'.EXT);
+ }
+
+ // Instantiate the result object
+ $RES = new $result();
+ $RES->conn_id = $this->conn_id;
+ $RES->db_debug = $this->db_debug;
+ $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;
+ }
+
+ return $RES;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Simple Query
+ * This is a simiplified version of the query() function. Internally
+ * we only use it when running transaction commands since they do
+ * not require all the features of the main query() function.
+ *
+ * @access public
+ * @param string the sql query
+ * @return mixed
+ */
+ function simple_query($sql)
+ {
+ if ( ! $this->conn_id)
+ {
+ $this->initialize();
+ }
+
+ return $this->_execute($sql, $this->conn_id);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * 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', $sql))
+ {
+ return FALSE;
+ }
+ return TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Calculate the aggregate query elapsed time
+ *
+ * @access public
+ * @param intiger The number of decimal places
+ * @return integer
+ */
+ function elapsed_time($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 $str;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Enables a native PHP function to be run, using a platform agnostic wrapper.
+ *
+ * @access public
+ * @param string the function name
+ * @param mixed any parameters needed by the function
+ * @return mixed
+ */
+ function call_function($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
+ {
+ $args = (func_num_args() > 1) ? array_shift(func_get_args()) : null;
+
+ return call_user_func_array($function, $args);
+ }
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Close DB Connection
+ *
+ * @access public
+ * @return void
+ */
+ function close()
+ {
+ if (is_resource($this->conn_id))
+ {
+ $this->_close($this->conn_id);
+ }
+ $this->conn_id = FALSE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Display an error message
+ *
+ * @access public
+ * @param string the error message
+ * @param string any "swap" values
+ * @param boolean whether to localize the message
+ * @return string sends the application/errror_db.php template
+ */
+ function display_error($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_once(BASEPATH.'libraries/Exceptions'.EXT);
+ }
+
+ $error = new CI_Exceptions();
+ echo $error->show_error('An Error Was Encountered', $message, 'error_db');
+ exit;
+
+ }
+
+}
+
+?> \ No newline at end of file
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