Файл: system/database/drivers/pdo/pdo_driver.php
Строк: 538
<?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
* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @author EllisLab Dev Team
* @link http://codeigniter.com
* @since Version 2.1.2
* @filesource
*/
// ------------------------------------------------------------------------
/**
* PDO Database Adapter Class
*
* Note: _DB is an extender class that the app controller
* creates dynamically based on whether the active record
* class is being used or not.
*
* @package CodeIgniter
* @subpackage Drivers
* @category Database
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/database/
*/
class CI_DB_pdo_driver extends CI_DB {
var $dbdriver = 'pdo';
// the character used to excape - not necessary for PDO
var $_escape_char = '';
var $_like_escape_str;
var $_like_escape_chr;
/**
* The syntax to count rows is slightly different across different
* database engines, so this string appears in each driver and is
* used for the count_all() and count_all_results() functions.
*/
var $_count_string = "SELECT COUNT(*) AS ";
var $_random_keyword;
var $options = array();
function __construct($params)
{
parent::__construct($params);
// clause and character used for LIKE escape sequences
if (strpos($this->hostname, 'mysql') !== FALSE)
{
$this->_like_escape_str = '';
$this->_like_escape_chr = '';
//Prior to this version, the charset can't be set in the dsn
if(is_php('5.3.6'))
{
$this->hostname .= ";charset={$this->char_set}";
}
//Set the charset with the connection options
$this->options['PDO::MYSQL_ATTR_INIT_COMMAND'] = "SET NAMES {$this->char_set}";
}
elseif (strpos($this->hostname, 'odbc') !== FALSE)
{
$this->_like_escape_str = " {escape '%s'} ";
$this->_like_escape_chr = '!';
}
else
{
$this->_like_escape_str = " ESCAPE '%s' ";
$this->_like_escape_chr = '!';
}
empty($this->database) OR $this->hostname .= ';dbname='.$this->database;
$this->trans_enabled = FALSE;
$this->_random_keyword = ' RND('.time().')'; // database specific random keyword
}
/**
* Non-persistent database connection
*
* @access private called by the base class
* @return resource
*/
function db_connect()
{
$this->options['PDO::ATTR_ERRMODE'] = PDO::ERRMODE_SILENT;
return new PDO($this->hostname, $this->username, $this->password, $this->options);
}
// --------------------------------------------------------------------
/**
* Persistent database connection
*
* @access private called by the base class
* @return resource
*/
function db_pconnect()
{
$this->options['PDO::ATTR_ERRMODE'] = PDO::ERRMODE_SILENT;
$this->options['PDO::ATTR_PERSISTENT'] = TRUE;
return new PDO($this->hostname, $this->username, $this->password, $this->options);
}
// --------------------------------------------------------------------
/**
* Reconnect
*
* Keep / reestablish the db connection if no queries have been
* sent for a length of time exceeding the server's idle timeout
*
* @access public
* @return void
*/
function reconnect()
{
if ($this->db->db_debug)
{
return $this->db->display_error('db_unsuported_feature');
}
return FALSE;
}
// --------------------------------------------------------------------
/**
* Select the database
*
* @access private called by the base class
* @return resource
*/
function db_select()
{
// Not needed for PDO
return TRUE;
}
// --------------------------------------------------------------------
/**
* Set client character set
*
* @access public
* @param string
* @param string
* @return resource
*/
function db_set_charset($charset, $collation)
{
// @todo - add support if needed
return TRUE;
}
// --------------------------------------------------------------------
/**
* Version number query string
*
* @access public
* @return string
*/
function _version()
{
return $this->conn_id->getAttribute(PDO::ATTR_CLIENT_VERSION);
}
// --------------------------------------------------------------------
/**
* Execute the query
*
* @access private called by the base class
* @param string an SQL query
* @return object
*/
function _execute($sql)
{
$sql = $this->_prep_query($sql);
$result_id = $this->conn_id->prepare($sql);
$result_id->execute();
if (is_object($result_id))
{
if (is_numeric(stripos($sql, 'SELECT')))
{
$this->affect_rows = count($result_id->fetchAll());
$result_id->execute();
}
else
{
$this->affect_rows = $result_id->rowCount();
}
}
else
{
$this->affect_rows = 0;
}
return $result_id;
}
// --------------------------------------------------------------------
/**
* Prep the query
*
* If needed, each database adapter can prep the query string
*
* @access private called by execute()
* @param string an SQL query
* @return string
*/
function _prep_query($sql)
{
return $sql;
}
// --------------------------------------------------------------------
/**
* Begin Transaction
*
* @access public
* @return bool
*/
function trans_begin($test_mode = FALSE)
{
if ( ! $this->trans_enabled)
{
return TRUE;
}
// When transactions are nested we only begin/commit/rollback the outermost ones
if ($this->_trans_depth > 0)
{
return TRUE;
}
// Reset the transaction failure flag.
// If the $test_mode flag is set to TRUE transactions will be rolled back
// even if the queries produce a successful result.
$this->_trans_failure = (bool) ($test_mode === TRUE);
return $this->conn_id->beginTransaction();
}
// --------------------------------------------------------------------
/**
* Commit Transaction
*
* @access public
* @return bool
*/
function trans_commit()
{
if ( ! $this->trans_enabled)
{
return TRUE;
}
// When transactions are nested we only begin/commit/rollback the outermost ones
if ($this->_trans_depth > 0)
{
return TRUE;
}
$ret = $this->conn->commit();
return $ret;
}
// --------------------------------------------------------------------
/**
* Rollback Transaction
*
* @access public
* @return bool
*/
function trans_rollback()
{
if ( ! $this->trans_enabled)
{
return TRUE;
}
// When transactions are nested we only begin/commit/rollback the outermost ones
if ($this->_trans_depth > 0)
{
return TRUE;
}
$ret = $this->conn_id->rollBack();
return $ret;
}
// --------------------------------------------------------------------
/**
* Escape String
*
* @access public
* @param string
* @param bool whether or not the string will be used in a LIKE condition
* @return string
*/
function escape_str($str, $like = FALSE)
{
if (is_array($str))
{
foreach ($str as $key => $val)
{
$str[$key] = $this->escape_str($val, $like);
}
return $str;
}
//Escape the string
$str = $this->conn_id->quote($str);
//If there are duplicated quotes, trim them away
if (strpos($str, "'") === 0)
{
$str = substr($str, 1, -1);
}
// escape LIKE condition wildcards
if ($like === TRUE)
{
$str = str_replace( array('%', '_', $this->_like_escape_chr),
array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),
$str);
}
return $str;
}
// --------------------------------------------------------------------
/**
* Affected Rows
*
* @access public
* @return integer
*/
function affected_rows()
{
return $this->affect_rows;
}
// --------------------------------------------------------------------
/**
* Insert ID
*
* @access public
* @return integer
*/
function insert_id($name=NULL)
{
//Convenience method for postgres insertid
if (strpos($this->hostname, 'pgsql') !== FALSE)
{
$v = $this->_version();
$table = func_num_args() > 0 ? func_get_arg(0) : NULL;
if ($table == NULL && $v >= '8.1')
{
$sql='SELECT LASTVAL() as ins_id';
}
$query = $this->query($sql);
$row = $query->row();
return $row->ins_id;
}
else
{
return $this->conn_id->lastInsertId($name);
}
}
// --------------------------------------------------------------------
/**
* "Count All" query
*
* Generates a platform-specific query string that counts all records in
* the specified database
*
* @access public
* @param string
* @return string
*/
function count_all($table = '')
{
if ($table == '')
{
return 0;
}
$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows') . " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));
if ($query->num_rows() == 0)
{
return 0;
}
$row = $query->row();
$this->_reset_select();
return (int) $row->numrows;
}
// --------------------------------------------------------------------
/**
* Show table query
*
* Generates a platform-specific query string so that the table names can be fetched
*
* @access private
* @param boolean
* @return string
*/
function _list_tables($prefix_limit = FALSE)
{
$sql = "SHOW TABLES FROM `".$this->database."`";
if ($prefix_limit !== FALSE AND $this->dbprefix != '')
{
//$sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
return FALSE; // not currently supported
}
return $sql;
}
// --------------------------------------------------------------------
/**
* Show column query
*
* Generates a platform-specific query string so that the column names can be fetched
*
* @access public
* @param string the table name
* @return string
*/
function _list_columns($table = '')
{
return "SHOW COLUMNS FROM ".$table;
}
// --------------------------------------------------------------------
/**
* Field data query
*
* Generates a platform-specific query so that the column data can be retrieved
*
* @access public
* @param string the table name
* @return object
*/
function _field_data($table)
{
return "SELECT TOP 1 FROM ".$table;
}
// --------------------------------------------------------------------
/**
* The error message string
*
* @access private
* @return string
*/
function _error_message()
{
$error_array = $this->conn_id->errorInfo();
return $error_array[2];
}
// --------------------------------------------------------------------
/**
* The error message number
*
* @access private
* @return integer
*/
function _error_number()
{
return $this->conn_id->errorCode();
}
// --------------------------------------------------------------------
/**
* Escape the SQL Identifiers
*
* This function escapes column and table names
*
* @access private
* @param string
* @return string
*/
function _escape_identifiers($item)
{
if ($this->_escape_char == '')
{
return $item;
}
foreach ($this->_reserved_identifiers as $id)
{
if (strpos($item, '.'.$id) !== FALSE)
{
$str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item);
// remove duplicates if the user already included the escape
return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
}
}
if (strpos($item, '.') !== FALSE)
{
$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;
}
else
{
$str = $this->_escape_char.$item.$this->_escape_char;
}
// remove duplicates if the user already included the escape
return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
}
// --------------------------------------------------------------------
/**
* From Tables
*
* This function implicitly groups FROM tables so there is no confusion
* about operator precedence in harmony with SQL standards
*
* @access public
* @param type
* @return type
*/
function _from_tables($tables)
{
if ( ! is_array($tables))
{
$tables = array($tables);
}
return (count($tables) == 1) ? $tables[0] : '('.implode(', ', $tables).')';
}
// --------------------------------------------------------------------
/**
* Insert statement
*
* Generates a platform-specific insert string from the supplied data
*
* @access public
* @param string the table name
* @param array the insert keys
* @param array the insert values
* @return string
*/
function _insert($table, $keys, $values)
{
return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
}
// --------------------------------------------------------------------
/**
* Insert_batch statement
*
* Generates a platform-specific insert string from the supplied data
*
* @access public
* @param string the table name
* @param array the insert keys
* @param array the insert values
* @return string
*/
function _insert_batch($table, $keys, $values)
{
return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES ".implode(', ', $values);
}
// --------------------------------------------------------------------
/**
* Update statement
*
* Generates a platform-specific update string from the supplied data
*
* @access public
* @param string the table name
* @param array the update data
* @param array the where clause
* @param array the orderby clause
* @param array the limit clause
* @return string
*/
function _update($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 $sql;
}
// --------------------------------------------------------------------
/**
* Update_Batch statement
*
* Generates a platform-specific batch update string from the supplied data
*
* @access public
* @param string the table name
* @param array the update data
* @param array the where clause
* @return string
*/
function _update_batch($table, $values, $index, $where = NULL)
{
$ids = array();
$where = ($where != '' AND count($where) >=1) ? implode(" ", $where).' AND ' : '';
foreach ($values as $key => $val)
{
$ids[] = $val[$index];
foreach (array_keys($val) as $field)
{
if ($field != $index)
{
$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
}
}
}
$sql = "UPDATE ".$table." SET ";
$cases = '';
foreach ($final as $k => $v)
{
$cases .= $k.' = CASE '."n";
foreach ($v as $row)
{
$cases .= $row."n";
}
$cases .= 'ELSE '.$k.' END, ';
}
$sql .= substr($cases, 0, -2);
$sql .= ' WHERE '.$where.$index.' IN ('.implode(',', $ids).')';
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 $this->_delete($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, $offset)
{
if (strpos($this->hostname, 'cubrid') !== FALSE || strpos($this->hostname, 'sqlite') !== FALSE)
{
if ($offset == 0)
{
$offset = '';
}
else
{
$offset .= ", ";
}
return $sql."LIMIT ".$offset.$limit;
}
else
{
$sql .= "LIMIT ".$limit;
if ($offset > 0)
{
$sql .= " OFFSET ".$offset;
}
return $sql;
}
}
// --------------------------------------------------------------------
/**
* Close DB Connection
*
* @access public
* @param resource
* @return void
*/
function _close($conn_id)
{
$this->conn_id = null;
}
}
/* End of file pdo_driver.php */
/* Location: ./system/database/drivers/pdo/pdo_driver.php */