777 行
无行尾
17 KiB
PHP
777 行
无行尾
17 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* oci8 Database Adapter Class
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*
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* Note: _DB is an extender class that the app controller
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* creates dynamically based on whether the active record
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* class is being used or not.
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*
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* @package CodeIgniter
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* @subpackage Drivers
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* @category Database
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/database/
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*/
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/**
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* oci8 Database Adapter Class
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*
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* This is a modification of the DB_driver class to
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* permit access to oracle databases
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*
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* NOTE: this uses the PHP 4 oci methods
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*
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* @author Kelly McArdle
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*
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*/
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class CI_DB_oci8_driver extends CI_DB {
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var $dbdriver = 'oci8';
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// The character used for excaping
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var $_escape_char = '"';
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// clause and character used for LIKE escape sequences
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var $_like_escape_str = " escape '%s' ";
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var $_like_escape_chr = '!';
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/**
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* The syntax to count rows is slightly different across different
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* database engines, so this string appears in each driver and is
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* used for the count_all() and count_all_results() functions.
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*/
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var $_count_string = "SELECT COUNT(1) AS ";
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var $_random_keyword = ' ASC'; // not currently supported
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// Set "auto commit" by default
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var $_commit = OCI_COMMIT_ON_SUCCESS;
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// need to track statement id and cursor id
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var $stmt_id;
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var $curs_id;
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// if we use a limit, we will add a field that will
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// throw off num_fields later
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var $limit_used;
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/**
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* Non-persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_connect()
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{
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return @ocilogon($this->username, $this->password, $this->hostname);
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}
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// --------------------------------------------------------------------
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/**
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* Persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_pconnect()
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{
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return @ociplogon($this->username, $this->password, $this->hostname);
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}
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// --------------------------------------------------------------------
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/**
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* Reconnect
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*
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* Keep / reestablish the db connection if no queries have been
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* sent for a length of time exceeding the server's idle timeout
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*
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* @access public
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* @return void
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*/
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function reconnect()
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{
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// not implemented in oracle
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}
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// --------------------------------------------------------------------
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/**
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* Select the database
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_select()
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{
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Set client character set
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*
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* @access public
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* @param string
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* @param string
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* @return resource
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*/
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function db_set_charset($charset, $collation)
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{
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// @todo - add support if needed
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Version number query string
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*
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* @access public
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* @return string
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*/
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function _version()
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{
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return ociserverversion($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Execute the query
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*
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* @access private called by the base class
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* @param string an SQL query
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* @return resource
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*/
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function _execute($sql)
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{
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// oracle must parse the query before it is run. All of the actions with
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// the query are based on the statement id returned by ociparse
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$this->stmt_id = FALSE;
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$this->_set_stmt_id($sql);
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ocisetprefetch($this->stmt_id, 1000);
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return @ociexecute($this->stmt_id, $this->_commit);
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}
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/**
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* Generate a statement ID
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*
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* @access private
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* @param string an SQL query
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* @return none
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*/
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function _set_stmt_id($sql)
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{
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if ( ! is_resource($this->stmt_id))
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{
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$this->stmt_id = ociparse($this->conn_id, $this->_prep_query($sql));
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}
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}
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// --------------------------------------------------------------------
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/**
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* Prep the query
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*
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* If needed, each database adapter can prep the query string
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*
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* @access private called by execute()
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* @param string an SQL query
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* @return string
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*/
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function _prep_query($sql)
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{
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* getCursor. Returns a cursor from the datbase
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*
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* @access public
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* @return cursor id
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*/
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function get_cursor()
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{
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$this->curs_id = ocinewcursor($this->conn_id);
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return $this->curs_id;
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}
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// --------------------------------------------------------------------
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/**
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* Stored Procedure. Executes a stored procedure
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*
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* @access public
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* @param package package stored procedure is in
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* @param procedure stored procedure to execute
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* @param params array of parameters
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* @return array
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*
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* params array keys
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*
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* KEY OPTIONAL NOTES
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* name no the name of the parameter should be in :<param_name> format
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* value no the value of the parameter. If this is an OUT or IN OUT parameter,
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* this should be a reference to a variable
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* type yes the type of the parameter
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* length yes the max size of the parameter
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*/
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function stored_procedure($package, $procedure, $params)
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{
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if ($package == '' OR $procedure == '' OR ! is_array($params))
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{
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if ($this->db_debug)
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{
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log_message('error', 'Invalid query: '.$package.'.'.$procedure);
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return $this->display_error('db_invalid_query');
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}
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return FALSE;
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}
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// build the query string
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$sql = "begin $package.$procedure(";
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$have_cursor = FALSE;
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foreach ($params as $param)
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{
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$sql .= $param['name'] . ",";
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if (array_key_exists('type', $param) && ($param['type'] == OCI_B_CURSOR))
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{
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$have_cursor = TRUE;
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}
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}
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$sql = trim($sql, ",") . "); end;";
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$this->stmt_id = FALSE;
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$this->_set_stmt_id($sql);
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$this->_bind_params($params);
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$this->query($sql, FALSE, $have_cursor);
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}
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// --------------------------------------------------------------------
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/**
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* Bind parameters
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*
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* @access private
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* @return none
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*/
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function _bind_params($params)
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{
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if ( ! is_array($params) OR ! is_resource($this->stmt_id))
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{
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return;
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}
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foreach ($params as $param)
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{
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foreach (array('name', 'value', 'type', 'length') as $val)
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{
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if ( ! isset($param[$val]))
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{
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$param[$val] = '';
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}
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}
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ocibindbyname($this->stmt_id, $param['name'], $param['value'], $param['length'], $param['type']);
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}
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}
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// --------------------------------------------------------------------
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/**
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* Begin Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_begin($test_mode = FALSE)
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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// Reset the transaction failure flag.
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// If the $test_mode flag is set to TRUE transactions will be rolled back
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// even if the queries produce a successful result.
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$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;
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$this->_commit = OCI_DEFAULT;
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Commit Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_commit()
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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$ret = OCIcommit($this->conn_id);
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$this->_commit = OCI_COMMIT_ON_SUCCESS;
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return $ret;
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}
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// --------------------------------------------------------------------
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/**
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* Rollback Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_rollback()
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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$ret = OCIrollback($this->conn_id);
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$this->_commit = OCI_COMMIT_ON_SUCCESS;
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return $ret;
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}
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// --------------------------------------------------------------------
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/**
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* Escape String
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*
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* @access public
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* @param string
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* @param bool whether or not the string will be used in a LIKE condition
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* @return string
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*/
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function escape_str($str, $like = FALSE)
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{
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if (is_array($str))
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{
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foreach ($str as $key => $val)
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{
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$str[$key] = $this->escape_str($val, $like);
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}
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return $str;
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}
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$str = remove_invisible_characters($str);
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// escape LIKE condition wildcards
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if ($like === TRUE)
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{
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$str = str_replace( array('%', '_', $this->_like_escape_chr),
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array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),
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$str);
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}
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return $str;
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}
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// --------------------------------------------------------------------
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/**
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* Affected Rows
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*
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* @access public
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* @return integer
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*/
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function affected_rows()
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{
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return @ocirowcount($this->stmt_id);
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}
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// --------------------------------------------------------------------
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/**
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* Insert ID
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*
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* @access public
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* @return integer
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*/
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function insert_id()
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{
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// not supported in oracle
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return $this->display_error('db_unsupported_function');
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}
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// --------------------------------------------------------------------
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/**
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* "Count All" query
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*
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* Generates a platform-specific query string that counts all records in
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* the specified database
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*
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* @access public
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* @param string
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* @return string
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*/
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function count_all($table = '')
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{
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if ($table == '')
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{
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return 0;
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}
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$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows') . " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));
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if ($query == FALSE)
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{
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return 0;
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}
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$row = $query->row();
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return (int) $row->numrows;
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}
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// --------------------------------------------------------------------
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/**
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* Show table query
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*
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* Generates a platform-specific query string so that the table names can be fetched
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*
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* @access private
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* @param boolean
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* @return string
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*/
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function _list_tables($prefix_limit = FALSE)
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{
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$sql = "SELECT TABLE_NAME FROM ALL_TABLES";
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if ($prefix_limit !== FALSE AND $this->dbprefix != '')
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{
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$sql .= " WHERE TABLE_NAME LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Show column query
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*
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* Generates a platform-specific query string so that the column names can be fetched
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*
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* @access public
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* @param string the table name
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* @return string
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*/
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function _list_columns($table = '')
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{
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return "SELECT COLUMN_NAME FROM all_tab_columns WHERE table_name = '$table'";
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}
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// --------------------------------------------------------------------
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/**
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* Field data query
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*
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* Generates a platform-specific query so that the column data can be retrieved
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*
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* @access public
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* @param string the table name
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* @return object
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*/
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function _field_data($table)
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{
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return "SELECT * FROM ".$table." where rownum = 1";
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}
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// --------------------------------------------------------------------
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/**
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* The error message string
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*
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* @access private
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* @return string
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*/
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function _error_message()
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{
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$error = ocierror($this->conn_id);
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return $error['message'];
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}
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// --------------------------------------------------------------------
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/**
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* The error message number
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*
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* @access private
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* @return integer
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*/
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function _error_number()
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{
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$error = ocierror($this->conn_id);
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return $error['code'];
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}
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// --------------------------------------------------------------------
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/**
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* Escape the SQL Identifiers
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*
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* This function escapes column and table names
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*
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* @access private
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* @param string
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* @return string
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*/
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function _escape_identifiers($item)
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{
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if ($this->_escape_char == '')
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{
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return $item;
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}
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foreach ($this->_reserved_identifiers as $id)
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{
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if (strpos($item, '.'.$id) !== FALSE)
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{
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$str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item);
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// remove duplicates if the user already included the escape
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return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
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}
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}
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if (strpos($item, '.') !== FALSE)
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{
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$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;
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}
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else
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{
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$str = $this->_escape_char.$item.$this->_escape_char;
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}
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// remove duplicates if the user already included the escape
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return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
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}
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// --------------------------------------------------------------------
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/**
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* From Tables
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*
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* This function implicitly groups FROM tables so there is no confusion
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* about operator precedence in harmony with SQL standards
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*
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* @access public
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* @param type
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* @return type
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*/
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function _from_tables($tables)
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{
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if ( ! is_array($tables))
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{
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$tables = array($tables);
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}
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return implode(', ', $tables);
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}
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// --------------------------------------------------------------------
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/**
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* Insert statement
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*
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* Generates a platform-specific insert string from the supplied data
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*
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* @access public
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* @param string the table name
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* @param array the insert keys
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* @param array the insert values
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* @return string
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*/
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function _insert($table, $keys, $values)
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{
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return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
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}
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// --------------------------------------------------------------------
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/**
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* Update statement
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*
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* Generates a platform-specific update string from the supplied data
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*
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* @access public
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|
* @param string the table name
|
|
* @param array the update data
|
|
* @param array the where clause
|
|
* @param array the orderby clause
|
|
* @param array the limit clause
|
|
* @return string
|
|
*/
|
|
function _update($table, $values, $where, $orderby = array(), $limit = FALSE)
|
|
{
|
|
foreach ($values as $key => $val)
|
|
{
|
|
$valstr[] = $key." = ".$val;
|
|
}
|
|
|
|
$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
|
|
|
|
$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';
|
|
|
|
$sql = "UPDATE ".$table." SET ".implode(', ', $valstr);
|
|
|
|
$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';
|
|
|
|
$sql .= $orderby.$limit;
|
|
|
|
return $sql;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Truncate statement
|
|
*
|
|
* Generates a platform-specific truncate string from the supplied data
|
|
* If the database does not support the truncate() command
|
|
* This function maps to "DELETE FROM table"
|
|
*
|
|
* @access public
|
|
* @param string the table name
|
|
* @return string
|
|
*/
|
|
function _truncate($table)
|
|
{
|
|
return "TRUNCATE TABLE ".$table;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Delete statement
|
|
*
|
|
* Generates a platform-specific delete string from the supplied data
|
|
*
|
|
* @access public
|
|
* @param string the table name
|
|
* @param array the where clause
|
|
* @param string the limit clause
|
|
* @return string
|
|
*/
|
|
function _delete($table, $where = array(), $like = array(), $limit = FALSE)
|
|
{
|
|
$conditions = '';
|
|
|
|
if (count($where) > 0 OR count($like) > 0)
|
|
{
|
|
$conditions = "\nWHERE ";
|
|
$conditions .= implode("\n", $this->ar_where);
|
|
|
|
if (count($where) > 0 && count($like) > 0)
|
|
{
|
|
$conditions .= " AND ";
|
|
}
|
|
$conditions .= implode("\n", $like);
|
|
}
|
|
|
|
$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
|
|
|
|
return "DELETE FROM ".$table.$conditions.$limit;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Limit string
|
|
*
|
|
* Generates a platform-specific LIMIT clause
|
|
*
|
|
* @access public
|
|
* @param string the sql query string
|
|
* @param integer the number of rows to limit the query to
|
|
* @param integer the offset value
|
|
* @return string
|
|
*/
|
|
function _limit($sql, $limit, $offset)
|
|
{
|
|
$limit = $offset + $limit;
|
|
$newsql = "SELECT * FROM (select inner_query.*, rownum rnum FROM ($sql) inner_query WHERE rownum < $limit)";
|
|
|
|
if ($offset != 0)
|
|
{
|
|
$newsql .= " WHERE rnum >= $offset";
|
|
}
|
|
|
|
// remember that we used limits
|
|
$this->limit_used = TRUE;
|
|
|
|
return $newsql;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Close DB Connection
|
|
*
|
|
* @access public
|
|
* @param resource
|
|
* @return void
|
|
*/
|
|
function _close($conn_id)
|
|
{
|
|
@ocilogoff($conn_id);
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/* End of file oci8_driver.php */
|
|
/* Location: ./system/database/drivers/oci8/oci8_driver.php */ |