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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); |
/** |
* CodeIgniter |
* |
* An open source application development framework for PHP 4.3.2 or newer |
* |
* @package CodeIgniter |
* @author ExpressionEngine Dev Team |
* @copyright Copyright (c) 2008, 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 = '"'; |
|
/** |
* 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, $this->hostname); |
} |
|
// -------------------------------------------------------------------- |
|
/** |
* Select the database |
* |
* @access private called by the base class |
* @return resource |
*/ |
function db_select() |
{ |
return TRUE; |
} |
|
// -------------------------------------------------------------------- |
|
/** |
* Set client character set |
* |
* @access public |
* @param string |
* @param string |
* @return resource |
*/ |
function db_set_charset($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 $ret; |
} |
|
// -------------------------------------------------------------------- |
|
/** |
* Escape String |
* |
* @access public |
* @param string |
* @return string |
*/ |
function escape_str($str) |
{ |
// Access the CI object |
$CI =& get_instance(); |
|
return $CI->_remove_invisible_characters($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 $row->NUMROWS; |
} |
|
// -------------------------------------------------------------------- |
|
/** |
* Show table query |
* |
* Generates a platform-specific query string so that the table names can be fetched |
* |
* @access private |
* @param boolean |
* @return string |
*/ |
function _list_tables($prefix_limit = FALSE) |
{ |
$sql = "SELECT TABLE_NAME FROM ALL_TABLES"; |
|
if ($prefix_limit !== FALSE AND $this->dbprefix != '') |
{ |
$sql .= " WHERE TABLE_NAME LIKE '".$this->dbprefix."%'"; |
} |
|
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 $item; |
} |
|
if (strpos($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 */ |