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Cloudlog/system/database/drivers/oci8/oci8_driver.php

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17 KiB
PHP
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<?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
*/
// ------------------------------------------------------------------------
/**
* oci8 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 ExpressionEngine Dev Team
* @link http://codeigniter.com/user_guide/database/
*/
/**
* oci8 Database Adapter Class
*
* This is a modification of the DB_driver class to
* permit access to oracle databases
*
* NOTE: this uses the PHP 4 oci methods
*
* @author Kelly McArdle
*
*/
class CI_DB_oci8_driver extends CI_DB {
var $dbdriver = 'oci8';
// The character used for excaping
var $_escape_char = '"';
// clause and character used for LIKE escape sequences
var $_like_escape_str = " escape '%s' ";
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(1) AS ";
var $_random_keyword = ' ASC'; // not currently supported
// Set "auto commit" by default
var $_commit = OCI_COMMIT_ON_SUCCESS;
// need to track statement id and cursor id
var $stmt_id;
var $curs_id;
// if we use a limit, we will add a field that will
// throw off num_fields later
var $limit_used;
/**
* Non-persistent database connection
*
* @access private called by the base class
* @return resource
*/
function db_connect()
{
return @ocilogon($this->username, $this->password, $this->hostname);
}
// --------------------------------------------------------------------
/**
* Persistent database connection
*
* @access private called by the base class
* @return resource
*/
function db_pconnect()
{
return @ociplogon($this->username, $this->password, $this->hostname);
}
// --------------------------------------------------------------------
/**
* Reconnect
*
* Keep / reestablish the db connection if no queries have been
* sent for a length of time exceeding the server's idle timeout
*
* @access public
* @return void
*/
function reconnect()
{
// not implemented in oracle
}
// --------------------------------------------------------------------
/**
* Select the database
*
* @access private called by the base class
* @return resource
*/
function db_select()
{
return TRUE;
}
// --------------------------------------------------------------------
/**
* Set client character set
*
* @access public
* @param string
* @param string
* @return resource
*/
function db_set_charset($charset, $collation)
{
// @todo - add support if needed
return TRUE;
}
// --------------------------------------------------------------------
/**
* Version number query string
*
* @access public
* @return string
*/
function _version()
{
return ociserverversion($this->conn_id);
}
// --------------------------------------------------------------------
/**
* Execute the query
*
* @access private called by the base class
* @param string an SQL query
* @return resource
*/
function _execute($sql)
{
// oracle must parse the query before it is run. All of the actions with
// the query are based on the statement id returned by ociparse
$this->stmt_id = FALSE;
$this->_set_stmt_id($sql);
ocisetprefetch($this->stmt_id, 1000);
return @ociexecute($this->stmt_id, $this->_commit);
}
/**
* Generate a statement ID
*
* @access private
* @param string an SQL query
* @return none
*/
function _set_stmt_id($sql)
{
if ( ! is_resource($this->stmt_id))
{
$this->stmt_id = ociparse($this->conn_id, $this->_prep_query($sql));
}
}
// --------------------------------------------------------------------
/**
* 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;
}
// --------------------------------------------------------------------
/**
* getCursor. Returns a cursor from the datbase
*
* @access public
* @return cursor id
*/
function get_cursor()
{
$this->curs_id = ocinewcursor($this->conn_id);
return $this->curs_id;
}
// --------------------------------------------------------------------
/**
* Stored Procedure. Executes a stored procedure
*
* @access public
* @param package package stored procedure is in
* @param procedure stored procedure to execute
* @param params array of parameters
* @return array
*
* params array keys
*
* KEY OPTIONAL NOTES
* name no the name of the parameter should be in :<param_name> format
* value no the value of the parameter. If this is an OUT or IN OUT parameter,
* this should be a reference to a variable
* type yes the type of the parameter
* length yes the max size of the parameter
*/
function stored_procedure($package, $procedure, $params)
{
if ($package == '' OR $procedure == '' OR ! is_array($params))
{
if ($this->db_debug)
{
log_message('error', 'Invalid query: '.$package.'.'.$procedure);
return $this->display_error('db_invalid_query');
}
return FALSE;
}
// build the query string
$sql = "begin $package.$procedure(";
$have_cursor = FALSE;
foreach ($params as $param)
{
$sql .= $param['name'] . ",";
if (array_key_exists('type', $param) && ($param['type'] == OCI_B_CURSOR))
{
$have_cursor = TRUE;
}
}
$sql = trim($sql, ",") . "); end;";
$this->stmt_id = FALSE;
$this->_set_stmt_id($sql);
$this->_bind_params($params);
$this->query($sql, FALSE, $have_cursor);
}
// --------------------------------------------------------------------
/**
* Bind parameters
*
* @access private
* @return none
*/
function _bind_params($params)
{
if ( ! is_array($params) OR ! is_resource($this->stmt_id))
{
return;
}
foreach ($params as $param)
{
foreach (array('name', 'value', 'type', 'length') as $val)
{
if ( ! isset($param[$val]))
{
$param[$val] = '';
}
}
ocibindbyname($this->stmt_id, $param['name'], $param['value'], $param['length'], $param['type']);
}
}
// --------------------------------------------------------------------
/**
* Begin Transaction
*
* @access public
* @return bool
*/
function trans_begin($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.
$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;
$this->_commit = OCI_DEFAULT;
return TRUE;
}
// --------------------------------------------------------------------
/**
* 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;
}
$ret = OCIcommit($this->conn_id);
$this->_commit = OCI_COMMIT_ON_SUCCESS;
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;
}
$ret = OCIrollback($this->conn_id);
$this->_commit = OCI_COMMIT_ON_SUCCESS;
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;
}
$str = remove_invisible_characters($str);
// 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 $str;
}
// --------------------------------------------------------------------
/**
* Affected Rows
*
* @access public
* @return integer
*/
function affected_rows()
{
return @ocirowcount($this->stmt_id);
}
// --------------------------------------------------------------------
/**
* Insert ID
*
* @access public
* @return integer
*/
function insert_id()
{
// not supported in oracle
return $this->display_error('db_unsupported_function');
}
// --------------------------------------------------------------------
/**
* "Count All" query
*
* Generates a platform-specific query string that counts all records in
* the specified database
*
* @access public
* @param string
* @return string
*/
function count_all($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 == FALSE)
{
return 0;
}
$row = $query->row();
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)
{
$sql = "SELECT TABLE_NAME FROM ALL_TABLES";
if ($prefix_limit !== FALSE AND $this->dbprefix != '')
{
$sql .= " WHERE TABLE_NAME LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
}
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 "SELECT COLUMN_NAME FROM all_tab_columns WHERE table_name = '$table'";
}
// --------------------------------------------------------------------
/**
* Field data query
*
* Generates a platform-specific query so that the column data can be retrieved
*
* @access public
* @param string the table name
* @return object
*/
function _field_data($table)
{
return "SELECT * FROM ".$table." where rownum = 1";
}
// --------------------------------------------------------------------
/**
* The error message string
*
* @access private
* @return string
*/
function _error_message()
{
$error = ocierror($this->conn_id);
return $error['message'];
}
// --------------------------------------------------------------------
/**
* The error message number
*
* @access private
* @return integer
*/
function _error_number()
{
$error = ocierror($this->conn_id);
return $error['code'];
}
// --------------------------------------------------------------------
/**
* Escape the SQL Identifiers
*
* This function escapes column and table names
*
* @access private
* @param string
* @return string
*/
function _escape_identifiers($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 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(', ', $values).")";
}
// --------------------------------------------------------------------
/**
* Update statement
*
* Generates a platform-specific update string from the supplied data
*
* @access public
* @param string the table name
* @param array the update data
* @param array the where clause
* @param array the orderby clause
* @param array the limit clause
* @return string
*/
function _update($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 $sql;
}
// --------------------------------------------------------------------
/**
* Truncate statement
*
* Generates a platform-specific truncate string from the supplied data
* If the database does not support the truncate() command
* This function maps to "DELETE FROM table"
*
* @access public
* @param string the table name
* @return string
*/
function _truncate($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 */
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