<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.1.6 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 */ // ------------------------------------------------------------------------ /** * Postgre 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_postgre_driver extends CI_DB { var $dbdriver = 'postgre'; 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(*) AS "; var $_random_keyword = ' RANDOM()'; // database specific random keyword /** * Connection String * * @access private * @return string */ function _connect_string() { $components = array( 'hostname' => 'host', 'port' => 'port', 'database' => 'dbname', 'username' => 'user', 'password' => 'password' ); $connect_string = ""; foreach ($components as $key => $val) { if (isset($this->$key) && $this->$key != '') { $connect_string .= " $val=".$this->$key; } } return trim($connect_string); } // -------------------------------------------------------------------- /** * Non-persistent database connection * * @access private called by the base class * @return resource */ function db_connect() { return @pg_connect($this->_connect_string()); } // -------------------------------------------------------------------- /** * Persistent database connection * * @access private called by the base class * @return resource */ function db_pconnect() { return @pg_pconnect($this->_connect_string()); } // -------------------------------------------------------------------- /** * 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 (pg_ping($this->conn_id) === FALSE) { $this->conn_id = FALSE; } } // -------------------------------------------------------------------- /** * Select the database * * @access private called by the base class * @return resource */ function db_select() { // Not needed for Postgre so we'll return TRUE return TRUE; } // -------------------------------------------------------------------- /** * Set client character set * * @param string * @return bool */ protected function _db_set_charset($charset) { return (pg_set_client_encoding($this->conn_id, $charset) === 0); } // -------------------------------------------------------------------- /** * Database version number * * @return string */ public function version() { if (isset($this->data_cache['version'])) { return $this->data_cache['version']; } if (($pg_version = pg_version($this->conn_id)) === FALSE) { return FALSE; } /* If PHP was compiled with PostgreSQL lib versions earlier * than 7.4, pg_version() won't return the server version * and so we'll have to fall back to running a query in * order to get it. */ return isset($pg_version['server']) ? $this->data_cache['version'] = $pg_version['server'] : parent::version(); } // -------------------------------------------------------------------- /** * Execute the query * * @access private called by the base class * @param string an SQL query * @return resource */ function _execute($sql) { $sql = $this->_prep_query($sql); return @pg_query($this->conn_id, $sql); } // -------------------------------------------------------------------- /** * Prep the query * * If needed, each database adapter can prep the query string * * @access private called by execute() * @param string an SQL query * @return string */ function _prep_query($sql) { return $sql; } // -------------------------------------------------------------------- /** * Begin Transaction * * @return bool */ public function trans_begin($test_mode = FALSE) { // When transactions are nested we only begin/commit/rollback the outermost ones if ( ! $this->trans_enabled OR $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); return @pg_query($this->conn_id, 'BEGIN'); } // -------------------------------------------------------------------- /** * Commit Transaction * * @return bool */ public function trans_commit() { // When transactions are nested we only begin/commit/rollback the outermost ones if ( ! $this->trans_enabled OR $this->_trans_depth > 0) { return TRUE; } return @pg_query($this->conn_id, 'COMMIT'); } // -------------------------------------------------------------------- /** * Rollback Transaction * * @return bool */ public function trans_rollback() { // When transactions are nested we only begin/commit/rollback the outermost ones if ( ! $this->trans_enabled OR $this->_trans_depth > 0) { return TRUE; } return @pg_query($this->conn_id, 'ROLLBACK'); } // -------------------------------------------------------------------- /** * 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; } $str = pg_escape_string($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 $str; } // -------------------------------------------------------------------- /** * Affected Rows * * @access public * @return integer */ function affected_rows() { return @pg_affected_rows($this->result_id); } // -------------------------------------------------------------------- /** * Insert ID * * @access public * @return integer */ function insert_id() { $v = $this->version(); $table = func_num_args() > 0 ? func_get_arg(0) : NULL; $column = func_num_args() > 1 ? func_get_arg(1) : NULL; if ($table == NULL && $v >= '8.1') { $sql='SELECT LASTVAL() as ins_id'; } elseif ($table != NULL && $column != NULL && $v >= '8.0') { $sql = sprintf("SELECT pg_get_serial_sequence('%s','%s') as seq", $table, $column); $query = $this->query($sql); $row = $query->row(); $sql = sprintf("SELECT CURRVAL('%s') as ins_id", $row->seq); } elseif ($table != NULL) { // seq_name passed in table parameter $sql = sprintf("SELECT CURRVAL('%s') as ins_id", $table); } else { return pg_last_oid($this->result_id); } $query = $this->query($sql); $row = $query->row(); return $row->ins_id; } // -------------------------------------------------------------------- /** * "Count All" query * * Generates a platform-specific query string that counts all records in * the specified database * * @access public * @param string * @return string */ function count_all($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) { $sql = "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public'"; if ($prefix_limit !== FALSE AND $this->dbprefix != '') { $sql .= " AND table_name LIKE '".$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 information_schema.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 ".$table." LIMIT 1"; } // -------------------------------------------------------------------- /** * Error * * Returns an array containing code and message of the last * database error that has occured. * * @return array */ public function error() { return array('code' => '', 'message' => pg_last_error($this->conn_id)); } // -------------------------------------------------------------------- /** * 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(', ', $values).")"; } // -------------------------------------------------------------------- /** * Insert_batch statement * * Generates a platform-specific insert string from the supplied data * * @access public * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ function _insert_batch($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 $sql; } // -------------------------------------------------------------------- /** * Truncate statement * * Generates a platform-specific truncate string from the supplied data * If the database does not support the truncate() command * This function maps to "DELETE FROM table" * * @access public * @param string the table name * @return string */ function _truncate($table) { return "TRUNCATE ".$table; } // -------------------------------------------------------------------- /** * Delete statement * * Generates a platform-specific delete string from the supplied data * * @access public * @param string the table name * @param array the where clause * @param string the limit clause * @return string */ function _delete($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) { $sql .= "LIMIT ".$limit; if ($offset > 0) { $sql .= " OFFSET ".$offset; } return $sql; } // -------------------------------------------------------------------- /** * Close DB Connection * * @access public * @param resource * @return void */ function _close($conn_id) { @pg_close($conn_id); } } /* End of file postgre_driver.php */ /* Location: ./system/database/drivers/postgre/postgre_driver.php */