Guía o Manual para instalar/crear base de datos MySQL

[cataflexia]

Hola a todos,

Soy muy novato en todo este asunto, pero me gustaría aprender.
Estoy intentando levantar un server y ya tengo casi todo listo, solo me falta configurar la base de datos (en realidad crearla).

El problema lo tengo por aquí en otro post: http://www.phpbb-es.com/foro/servidores ... e&iaddlist

...y supongo que todo mi problema está relacionado en cómo crear la BD.

***Recuerdo que en el año 2006 levanté un template PHP con MySQL, y recuerdo que el mismo sitio (template) tenía la capacidad de crear la BD, formatearla y generarle todas sus tablas automáticamente, no recuerdo haber tenido que "crear" una BD, en fin, puedo estar equivocado y quizás estoy confundiendo las cosas***

Entonces, ahora en el año 2012, se supone que debo poner algunos datos importantes a la hora de instalar mi página.

En sí, encontré algunas diferencias entre páginas PHP (o templates, no sé si me equivoco) y páginas phpBB3 (que descargué aquí). Lo que si son iguales en lo que ambas me piden lo mismo a la hora de instalarse en mi IIS 6...

Database name:
Database username:
Database password:
Prefix for tables in database:

Pero en ningún tutorial de este foro sale cómo crear paso a paso una BD en MySQL.

Tengo varias dudas sobre esto:

¿Con qué herramienta creo la BD? Supongo que debería ser con una aplicación que se me instaló cuando instalé MySQL 5.5 la cual se llama MySQL Workbench 5.2 CE. ¿Estoy en lo correcto?

Abrí MySQL Workbench y cinseramente, no tengo IDEA! de cómo crear la famosa DB.

Y si lograse crear la BD, ¿dónde queda guardada? (me refiero al archivo físico en sí)

¿En alguna ruta dentro del dusco duro? (supongo!) pero no sé donde!

¿Debo indicarle a mi página PHP dónde esta guardada mi BD? O solo debo indicarle el nombre de mi BD y mi página irá sola a buscar mi BD? ¿Así de simple?

¿Qué prefijo debo poner en mi BD? ¿El que yo quiera? "The prefix must start with a letter and must only contain letters, numbers and underscores."

...se que dice que el prefijo debe empezar con letras y debe tener solo letras, números y subrayado. Pero la pregunta se enfoca a ¿puedo colocar el prefijo que se me dé la gana? O debe ser de acuerdo a lo que exige la página en que estoy levantando?

Ejmplos:

dasdhhasdf_
d123871263987sd_
XDDDD_

Quizás mis dudas son muy básicas, pero en realidad necesito una mano con todo esto.

Espero me puedan ayudar, y gracias de antemano.
Saludos!

PD: Ha! aprovecho de pedir la última alcaración... veo que hay algunas páginas hechas en PHP (que descargué) y aquí hay páginas en phpBB3. Son lo mismo? tienen diferencias? O simplemente se refieren a los foros que son phpBB3 y las páginas normales son PHP? Bueno, gracias nuevamente.

[karbiko]

En workbench:

create database nombre_tu_bbdd;


Luego tienes que crear las tablas:

CREATE TABLE nombre _de_la_tabla (
nombre_del_campo1 tipo_de_dato1,
nombre_del_campo2 tipo_de_dato2,
nombre_del_campo3 tipo_de_dato3,
...
nombre_del_campo_n tipo_de_dato_n,
[PRIMARY KEY (clave primaria),]
[FOREIGN KEY (clave externa) REFERENCES tabla (campo clave), ]
[CHECK (condición de la restricción)]);


y entonces no acabas sino de empezar....

[cataflexia]

Gracias karbiko!

¿Pero qué nombres de tablas debo poner?

Mi página arroja el error:

Código: Seleccionar todo

A Database Error Occurred
Error Number: 1146

Table 'ikodehlpdsk.db_session' doesn't exist

INSERT INTO `DB_session` (`session_id`, `ip_address`, `user_agent`, `last_activity`) VALUES ('c6a6285fc7e998e4646ca0f6c742dedd', '127.0.0.1', 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2;', 1339512928)

Filename: C:\Inetpub\wwwroot\phphelpdesk\system\database\DB_driver.php

Line Number: 330

No me digas que tengo que crear una a una todas las tablas???

Y qué hay con la ruta de la BD? ¿mi página detectará automáticamente la ruta y encontrará mi BD???

(además, donde rayos está guardada mi BD cuando la creo???)

Como comenté en el post anterior: El año 2006 levanté un sitio en PHP Nuke y había una función de la misma página que creaba las tablas automáticamente dentro de mi BD. Uno solo le decía dónde estaba la BD, o guardaba la base de datos en un directorio en particular, y la página hacía el resto de crear las tablas, etc.

Ya que si comprendes, son alrededor de 1500 TABLAS!!! o posiblemente más! ¿no crees que es poco productivo hacerlo así?

Recuerdo que en tan solo unos minutos tenía mi página lista para ser ocupada con PHP Nuke. No existe lo mismo en phpBB???

Bueno, espero haber sido claro, y gracias por la respuesta.

Saludos!

[karbiko]

Esas instrucciones son para crear la bbdd y las tablas a mano...
Pensé que estabas trabajando en otra bbdd personalizada, no en la de gestión del foro.

si lo que quieres es crear la bbdd para el foro, primero tienes que crearla en phpmyadmin que está en en los servicios de tu host.

Con los datos de esa bbdd y el user y contraseña, haces la instalación del paquete de phpbb3 y entonces se crean todas las tablas necesarias para gestionar el foro.

En la zona de guías y manuales existen tutoriales de cómo hacer la instalación.

si tienes dudas, prueba a instalar phpbb3 en un servidor local y haces las pruebas primero en él.
Así le vas cogiendo el tranquillo.

[cataflexia]

Bueno, consultando por aquí y por allá, logré detectar que el template que bajé viene con un error en uno de sus archivos encargados de crear todas las tablas necesarias dentro de mi BD...

...específicamente el archivo:

Código: Seleccionar todo

C:\Inetpub\wwwroot\phphelpdesk\system\database\DB_driver.php

y supongo que tendré que crear las tablas faltantes a mano.

pero...

¿Qué circunstancias trae todo esto?

ya que si creo las tablas que me faltan a mano...

Código: Seleccionar todo

Table 'ikodehlpdsk.db_session' doesn't exist

y creo sus respectivos campos que faltan...

Código: Seleccionar todo

INSERT INTO `DB_session` (`session_id`, `ip_address`, `user_agent`, `last_activity`)

...supongo que además vienen algunas relaciones entre otras tablas, y los campos que están dentro de las tablas quisás también tienen otras relaciones con otros campos.

Creo que sería mejor intentar reparar el código del archivo DB_driver.php

Código: Seleccionar todo

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://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		ExpressionEngine Dev Team
 * @link		http://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 CI_DB_driver($params)
	{
		if (is_array($params))
		{
			foreach ($params as $key => $val)
			{
				$this->$key = $val;
			}
		}

		log_message('debug', 'Database Driver Class Initialized');
	}

	// --------------------------------------------------------------------

	/**
	 * Initialize Database Settings
	 *
	 * @access	private Called by the constructor
	 * @param	mixed
	 * @return	void
	 */
	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))
		{
			return TRUE;
		}

		// ----------------------------------------------------------------

		// Connect to the database and set the connection ID
		$this->conn_id = ($this->pconnect == FALSE) ? $this->db_connect() : $this->db_pconnect();

		// No connection resource?  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 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);
				}
				return FALSE;
			}
			else
			{
				// We've selected the DB. Now we set the character set
				if ( ! $this->db_set_charset($this->char_set, $this->dbcollat))
				{
					return FALSE;
				}

				return TRUE;
			}
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Set client character set
	 *
	 * @access	public
	 * @param	string
	 * @param	string
	 * @return	resource
	 */
	function db_set_charset($charset, $collation)
	{
		if ( ! $this->_db_set_charset($this->char_set, $this->dbcollat))
		{
			log_message('error', 'Unable to set database connection charset: '.$this->char_set);

			if ($this->db_debug)
			{
				$this->display_error('db_unable_to_set_charset', $this->char_set);
			}

			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;
		}

		// 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');

		if (in_array($this->dbdriver, $driver_version_exceptions))
		{
			return $sql;
		}
		else
		{
			$query = $this->query($sql);
			return $query->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;
		}

		// Verify table prefix and replace if necessary
		if ( ($this->dbprefix != '' AND $this->swap_pre != '') AND ($this->dbprefix != $this->swap_pre) )
		{
			$sql = preg_replace("/(\W)".$this->swap_pre."(\S+?)/", "\\1".$this->dbprefix."\\2", $sql);
		}

		// 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
		if ($this->save_queries == TRUE)
		{
			$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)))
		{
			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->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
				// 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
											)
										);
			}

			return FALSE;
		}

		// Stop and aggregate the query time results
		$time_end = list($em, $es) = explode(' ', microtime());
		$this->benchmark += ($em + $es) - ($sm + $ss);

		if ($this->save_queries == TRUE)
		{
			$this->query_times[] = ($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;
			$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
		// 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;
	}

	// --------------------------------------------------------------------

	/**
	 * 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
	 *
	 * @access	public
	 * @return	void
	 */
	function trans_strict($mode = TRUE)
	{
		$this->trans_strict = is_bool($mode) ? $mode : TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * 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 FALSE in the event that a query failed
		if ($this->_trans_status === FALSE)
		{
			$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.
			if ($this->trans_strict === FALSE)
			{
				$this->_trans_status = TRUE;
			}

			log_message('debug', '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_status;
	}

	// --------------------------------------------------------------------

	/**
	 * Compile Bindings
	 *
	 * @access	public
	 * @param	string	the sql statement
	 * @param	array	an array of bind data
	 * @return	string
	 */
	function compile_binds($sql, $binds)
	{
		if (strpos($sql, $this->bind_marker) === FALSE)
		{
			return $sql;
		}

		if ( ! is_array($binds))
		{
			$binds = array($binds);
		}

		// Get the sql segments around the bind markers
		$segments = explode($this->bind_marker, $sql);

		// 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);
		}

		// Construct the binded query
		$result = $segments[0];
		$i = 0;
		foreach ($binds as $bind)
		{
			$result .= $this->escape($bind);
			$result .= $segments[++$i];
		}

		return $result;
	}

	// --------------------------------------------------------------------

	/**
	 * 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*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|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	mixed
	 */
	function escape($str)
	{
		if (is_string($str))
		{
			$str = "'".$this->escape_str($str)."'";
		}
		elseif (is_bool($str))
		{
			$str = ($str === FALSE) ? 0 : 1;
		}
		elseif (is_null($str))
		{
			$str = 'NULL';
		}

		return $str;
	}

	// --------------------------------------------------------------------

	/**
	 * Escape LIKE String
	 *
	 * Calls the individual driver for platform
	 * specific escaping for LIKE conditions
	 *
	 * @access	public
	 * @param	string
	 * @return	mixed
	 */
	function escape_like_str($str)
	{
		return $this->escape_str($str, TRUE);
	}

	// --------------------------------------------------------------------

	/**
	 * 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($constrain_by_prefix = FALSE)
	{
		// Is there a cached result?
		if (isset($this->data_cache['table_names']))
		{
			return $this->data_cache['table_names'];
		}

		if (FALSE === ($sql = $this->_list_tables($constrain_by_prefix)))
		{
			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->_protect_identifiers($table_name, TRUE, FALSE, FALSE), $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 = $this->_list_columns($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;
	}

	// --------------------------------------------------------------------

	/**
	 * 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($this->_protect_identifiers($table, TRUE, NULL, FALSE)));

		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[] = $this->_escape_identifiers($key);
			$values[] = $this->escape($val);
		}

		return $this->_insert($this->_protect_identifiers($table, TRUE, NULL, FALSE), $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)
		{
			$fields[$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 .= ' =';
					}

					$val = ' '.$this->escape($val);
				}

				$dest[] = $prefix.$key.$val;
			}
		}

		return $this->_update($this->_protect_identifiers($table, TRUE, NULL, FALSE), $fields, $dest);
	}

	// --------------------------------------------------------------------

	/**
	 * Tests whether the string has an SQL operator
	 *
	 * @access	private
	 * @param	string
	 * @return	bool
	 */
	function _has_operator($str)
	{
		$str = trim($str);
		if ( ! preg_match("/(\s|<|>|!|=|is null|is not null)/i", $str))
		{
			return FALSE;
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * 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 ( ! class_exists('CI_DB_Cache'))
		{
			if ( ! @include(BASEPATH.'database/DB_cache'.EXT))
			{
				return $this->cache_off();
			}
		}

		$this->CACHE = new CI_DB_Cache($this); // pass db object to support multiple db connections and returned db objects
		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Close DB Connection
	 *
	 * @access	public
	 * @return	void
	 */
	function close()
	{
		if (is_resource($this->conn_id) OR is_object($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 =& load_class('Lang', 'core');
		$LANG->load('db');

		$heading = $LANG->line('db_error_heading');

		if ($native == TRUE)
		{
			$message = $error;
		}
		else
		{
			$message = ( ! is_array($error)) ? array(str_replace('%s', $swap, $LANG->line($error))) : $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)
			{
				// Found it - use a relative path for safety
				$message[] = 'Filename: '.str_replace(array(BASEPATH, APPPATH), '', $call['file']);
				$message[] = 'Line Number: '.$call['line'];

				break;
			}
		}

		$error =& load_class('Exceptions', 'core');
		echo $error->show_error($heading, $message, 'error_db');
		exit;
	}

	// --------------------------------------------------------------------

	/**
	 * 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:
	 *
	 * SELECT * FROM hostname.database.table.column AS c FROM hostname.database.table
	 *
	 * Or a query with aliasing:
	 *
	 * SELECT m.member_id, m.member_name FROM members AS m
	 *
	 * Since the column name can include up to four segments (host, DB, table, column)
	 * or also have an alias prefix, we need to do a bit of work to figure this out and
	 * 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, $field_exists = TRUE)
	{
		if ( ! is_bool($protect_identifiers))
		{
			$protect_identifiers = $this->_protect_identifiers;
		}

		if (is_array($item))
		{
			$escaped_array = array();

			foreach ($item as $k => $v)
			{
				$escaped_array[$this->_protect_identifiers($k)] = $this->_protect_identifiers($v);
			}

			return $escaped_array;
		}

		// Convert tabs or multiple spaces into single spaces
		$item = preg_replace('/[\t ]+/', ' ', $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
		$alias = '';
		if (strpos($item, ' ') !== FALSE)
		{
			$alias = strstr($item, " ");
			$item = substr($item, 0, - strlen($alias));
		}

		// 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)
		{
			return $item.$alias;
		}

		// Break the string apart if it contains periods, then insert the table prefix
		// in the correct location, assuming the period doesn't indicate that we're dealing
		// with an alias. While we're at it, we will escape the components
		if (strpos($item, '.') !== FALSE)
		{
			$parts	= explode('.', $item);

			// Does the first segment of the exploded item match
			// one of the aliases previously identified?  If so,
			// we have nothing more to do other than escape the item
			if (in_array($parts[0], $this->ar_aliased_tables))
			{
				if ($protect_identifiers === TRUE)
				{
					foreach ($parts as $key => $val)
					{
						if ( ! in_array($val, $this->_reserved_identifiers))
						{
							$parts[$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 ($this->dbprefix != '')
			{
				// We now add the table prefix based on some logic.
				// Do we have 4 segments (hostname.database.table.column)?
				// If so, we add the table prefix to the column name in the 3rd segment.
				if (isset($parts[3]))
				{
					$i = 2;
				}
				// Do we have 3 segments (database.table.column)?
				// If so, we add the table prefix to the column name in 2nd position
				elseif (isset($parts[2]))
				{
					$i = 1;
				}
				// Do we have 2 segments (table.column)?
				// If so, we add the table prefix to the column name in 1st segment
				else
				{
					$i = 0;
				}

				// 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)
				{
					$i++;
				}

				// Verify table prefix and replace if necessary
				if ($this->swap_pre != '' && strncmp($parts[$i], $this->swap_pre, strlen($this->swap_pre)) === 0)
				{
					$parts[$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)
				{
					$parts[$i] = $this->dbprefix.$parts[$i];
				}

				// Put the parts back together
				$item = implode('.', $parts);
			}

			if ($protect_identifiers === TRUE)
			{
				$item = $this->_escape_identifiers($item);
			}

			return $item.$alias;
		}

		// 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)
			{
				$item = preg_replace("/^".$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)
			{
				$item = $this->dbprefix.$item;
			}
		}

		if ($protect_identifiers === TRUE AND ! in_array($item, $this->_reserved_identifiers))
		{
			$item = $this->_escape_identifiers($item);
		}

		return $item.$alias;
	}


}


/* End of file DB_driver.php */
/* Location: ./system/database/DB_driver.php */

Según el mensaje de error el problema está en la línea 300 (cuando instalo la página desde Internet Explorer) o en la línea 330 (cuando instalo la página desde Firefox)

Código: Seleccionar todo

Filename: C:\Inetpub\wwwroot\phphelpdesk\system\database\DB_driver.php
**DESDE INTERNET EXPLORER**
Line Number: 300

Código: Seleccionar todo

Filename: C:\Inetpub\wwwroot\phphelpdesk\system\database\DB_driver.php
**DESDE INTERNET FIREFOX**
Line Number: 330

Creo que este problema lo debería postear en otro foro, ya que el problema ahora ya no es de la BD, el problema es de código PHP.