<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.2.4 or newer * * NOTICE OF LICENSE * * Licensed under the Open Software License version 3.0 * * This source file is subject to the Open Software License (OSL 3.0) that is * bundled with this package in the files license.txt / license.rst. It is * also available through the world wide web at this URL: * http://opensource.org/licenses/OSL-3.0 * If you did not receive a copy of the license and are unable to obtain it * through the world wide web, please send an email to * licensing@ellislab.com so we can send you a copy immediately. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/) * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) * @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 EllisLab 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 * * @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 $limit_used; /** * Non-persistent database connection * * @access private called by the base class * @return resource */ public function db_connect() { return @oci_connect($this->username, $this->password, $this->hostname, $this->char_set); } // -------------------------------------------------------------------- /** * Persistent database connection * * @access private called by the base class * @return resource */ public function db_pconnect() { return @oci_pconnect($this->username, $this->password, $this->hostname, $this->char_set); } // -------------------------------------------------------------------- /** * Reconnect * * Keep / reestablish the db connection if no queries have been * sent for a length of time exceeding the server's idle timeout * * @access public * @return void */ public function reconnect() { // not implemented in oracle return; } // -------------------------------------------------------------------- /** * Select the database * * @access private called by the base class * @return resource */ public function db_select() { // Not in Oracle - schemas are actually usernames return TRUE; } // -------------------------------------------------------------------- /** * Database version number * * @return string */ public function version() { return isset($this->data_cache['version']) ? $this->data_cache['version'] : $this->data_cache['version'] = oci_server_version($this->conn_id); } // -------------------------------------------------------------------- /** * Execute the query * * @access protected called by the base class * @param string an SQL query * @return resource */ protected 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); oci_set_prefetch($this->stmt_id, 1000); return @oci_execute($this->stmt_id, $this->_commit); } /** * Generate a statement ID * * @access private * @param string an SQL query * @return none */ private function _set_stmt_id($sql) { if ( ! is_resource($this->stmt_id)) { $this->stmt_id = oci_parse($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 */ private function _prep_query($sql) { return $sql; } // -------------------------------------------------------------------- /** * getCursor. Returns a cursor from the datbase * * @access public * @return cursor id */ public function get_cursor() { $this->curs_id = oci_new_cursor($this->conn_id); return $this->curs_id; } // -------------------------------------------------------------------- /** * Stored Procedure. Executes a stored procedure * * @access public * @param package package stored procedure is in * @param procedure stored procedure to execute * @param params array of parameters * @return array * * params array keys * * KEY OPTIONAL NOTES * name no the name of the parameter should be in :<param_name> format * value no the value of the parameter. If this is an OUT or IN OUT parameter, * this should be a reference to a variable * type yes the type of the parameter * length yes the max size of the parameter */ public function stored_procedure($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, $have_cursor); } // -------------------------------------------------------------------- /** * Bind parameters * * @access private * @return none */ private function _bind_params($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] = ''; } } oci_bind_by_name($this->stmt_id, $param['name'], $param['value'], $param['length'], $param['type']); } } // -------------------------------------------------------------------- /** * Begin Transaction * * @access public * @return bool */ public function trans_begin($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 */ public 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; } $ret = oci_commit($this->conn_id); $this->_commit = OCI_COMMIT_ON_SUCCESS; return $ret; } // -------------------------------------------------------------------- /** * Rollback Transaction * * @access public * @return bool */ public 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; } $ret = oci_rollback($this->conn_id); $this->_commit = OCI_COMMIT_ON_SUCCESS; return $ret; } // -------------------------------------------------------------------- /** * Escape String * * @param string * @param bool whether or not the string will be used in a LIKE condition * @return string */ public function escape_str($str, $like = FALSE) { if (is_array($str)) { foreach ($str as $key => $val) { $str[$key] = $this->escape_str($val, $like); } return $str; } $str = str_replace("'", "''", remove_invisible_characters($str)); // escape LIKE condition wildcards if ($like === TRUE) { return str_replace(array($this->_like_escape_chr, '%', '_'), array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'), $str); } return $str; } // -------------------------------------------------------------------- /** * Affected Rows * * @access public * @return integer */ public function affected_rows() { return @oci_num_rows($this->stmt_id); } // -------------------------------------------------------------------- /** * Insert ID * * @access public * @return integer */ public function insert_id() { // not supported in oracle return $this->display_error('db_unsupported_function'); } // -------------------------------------------------------------------- /** * "Count All" query * * Generates a platform-specific query string that counts all records in * the specified database * * @access public * @param string * @return string */ public function count_all($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(); $this->_reset_select(); return (int) $row->numrows; } // -------------------------------------------------------------------- /** * Show table query * * Generates a platform-specific query string so that the table names can be fetched * * @access protected * @param boolean * @return string */ protected function _list_tables($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 $sql; } // -------------------------------------------------------------------- /** * Show column query * * Generates a platform-specific query string so that the column names can be fetched * * @access protected * @param string the table name * @return string */ protected function _list_columns($table = '') { return "SELECT COLUMN_NAME FROM all_tab_columns WHERE table_name = '$table'"; } // -------------------------------------------------------------------- /** * Field data query * * Generates a platform-specific query so that the column data can be retrieved * * @access public * @param string the table name * @return object */ protected function _field_data($table) { return "SELECT * FROM ".$table." where rownum = 1"; } // -------------------------------------------------------------------- /** * Error * * Returns an array containing code and message of the last * database error that has occured. * * @return array */ public function error() { /* oci_error() returns an array that already contains the * 'code' and 'message' keys, so we can just return it. */ if (is_resource($this->curs_id)) { return oci_error($this->curs_id); } elseif (is_resource($this->stmt_id)) { return oci_error($this->stmt_id); } elseif (is_resource($this->conn_id)) { return oci_error($this->conn_id); } return oci_error(); } // -------------------------------------------------------------------- /** * Escape the SQL Identifiers * * This function escapes column and table names * * @access protected * @param string * @return string */ protected function _escape_identifiers($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, $str); } // -------------------------------------------------------------------- /** * From Tables * * This function implicitly groups FROM tables so there is no confusion * about operator precedence in harmony with SQL standards * * @access protected * @param type * @return type */ protected function _from_tables($tables) { if ( ! is_array($tables)) { $tables = array($tables); } return implode(', ', $tables); } // -------------------------------------------------------------------- /** * Insert statement * * Generates a platform-specific insert string from the supplied data * * @access public * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ protected function _insert($table, $keys, $values) { return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")"; } // -------------------------------------------------------------------- /** * Insert_batch statement * * Generates a platform-specific insert string from the supplied data * * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ protected function _insert_batch($table, $keys, $values) { $keys = implode(', ', $keys); $sql = "INSERT ALL\n"; for ($i = 0, $c = count($values); $i < $c; $i++) { $sql .= ' INTO ' . $table . ' (' . $keys . ') VALUES ' . $values[$i] . "\n"; } $sql .= 'SELECT * FROM dual'; return $sql; } // -------------------------------------------------------------------- /** * Update statement * * Generates a platform-specific update string from the supplied data * * @access protected * @param string the table name * @param array the update data * @param array the where clause * @param array the orderby clause * @param array the limit clause * @return string */ protected function _update($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 $sql; } // -------------------------------------------------------------------- /** * Truncate statement * * Generates a platform-specific truncate string from the supplied data * If the database does not support the truncate() command * This function maps to "DELETE FROM table" * * @access protected * @param string the table name * @return string */ protected function _truncate($table) { return "TRUNCATE TABLE ".$table; } // -------------------------------------------------------------------- /** * Delete statement * * Generates a platform-specific delete string from the supplied data * * @access protected * @param string the table name * @param array the where clause * @param string the limit clause * @return string */ protected function _delete($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.$limit; } // -------------------------------------------------------------------- /** * Limit string * * Generates a platform-specific LIMIT clause * * @access protected * @param string the sql query string * @param integer the number of rows to limit the query to * @param integer the offset value * @return string */ protected function _limit($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 $newsql; } // -------------------------------------------------------------------- /** * Close DB Connection * * @access protected * @param resource * @return void */ protected function _close($conn_id) { @oci_close($conn_id); } } /* End of file oci8_driver.php */ /* Location: ./system/database/drivers/oci8/oci8_driver.php */