<?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 Rick Ellis * @copyright Copyright (c) 2006, EllisLab, Inc. * @license http://www.codeigniter.com/user_guide/license.html * @link http://www.codeigniter.com * @since Version 1.0 * @filesource */ // ------------------------------------------------------------------------ /** * SQLite 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 Rick Ellis * @link http://www.codeigniter.com/user_guide/database/ */ class CI_DB_sqlite_driver extends CI_DB { /** * 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 numrows "; var $_random_keyword = ' Random()'; // database specific random keyword /** * Non-persistent database connection * * @access private called by the base class * @return resource */ function db_connect() { if ( ! $conn_id = @sqlite_open($this->database, 0666, $error)) { log_message('error', $error); if ($this->db_debug) { $this->display_error($error, '', TRUE); } return FALSE; } return $conn_id; } // -------------------------------------------------------------------- /** * Persistent database connection * * @access private called by the base class * @return resource */ function db_pconnect() { if ( ! $conn_id = @sqlite_popen($this->database, 0666, $error)) { log_message('error', $error); if ($this->db_debug) { $this->display_error($error, '', TRUE); } return FALSE; } return $conn_id; } // -------------------------------------------------------------------- /** * Select the database * * @access private called by the base class * @return resource */ function db_select() { return TRUE; } // -------------------------------------------------------------------- /** * Version number query string * * @access public * @return string */ function _version() { return sqlite_libversion(); } // -------------------------------------------------------------------- /** * Execute the query * * @access private called by the base class * @param string an SQL query * @return resource */ function _execute($sql) { $sql = $this->_prep_query($sql); return @sqlite_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 $sql; } // -------------------------------------------------------------------- /** * Begin Transaction * * @access public * @return bool */ function trans_begin($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->simple_query('BEGIN TRANSACTION'); 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; } $this->simple_query('COMMIT'); return TRUE; } // -------------------------------------------------------------------- /** * 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; } $this->simple_query('ROLLBACK'); return TRUE; } // -------------------------------------------------------------------- /** * Escape String * * @access public * @param string * @return string */ function escape_str($str) { return sqlite_escape_string($str); } // -------------------------------------------------------------------- /** * Affected Rows * * @access public * @return integer */ function affected_rows() { return sqlite_changes($this->conn_id); } // -------------------------------------------------------------------- /** * Insert ID * * @access public * @return integer */ function insert_id() { return @sqlite_last_insert_rowid($this->conn_id); } // -------------------------------------------------------------------- /** * "Count All" query * * Generates a platform-specific query string that counts all records in * the specified database * * @access public * @param string * @return string */ function count_all($table = '') { if ($table == '') return '0'; $query = $this->query($this->_count_string . "FROM `".$this->dbprefix.$table."`"); if ($query->num_rows() == 0) return '0'; $row = $query->row(); return $row->numrows; } // -------------------------------------------------------------------- /** * List table query * * Generates a platform-specific query string so that the table names can be fetched * * @access private * @return string */ function _list_tables() { return "SELECT name from sqlite_master WHERE type='table'"; } // -------------------------------------------------------------------- /** * Show column query * * Generates a platform-specific query string so that the column names can be fetched * * @access public * @param string the table name * @return string */ function _list_columns($table = '') { // Not supported return FALSE; } // -------------------------------------------------------------------- /** * 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($table) { return "SELECT * FROM ".$this->_escape_table($table)." LIMIT 1"; } // -------------------------------------------------------------------- /** * The error message string * * @access private * @return string */ function _error_message() { return sqlite_error_string(sqlite_last_error($this->conn_id)); } // -------------------------------------------------------------------- /** * The error message number * * @access private * @return integer */ function _error_number() { return sqlite_last_error($this->conn_id); } // -------------------------------------------------------------------- /** * Escape Table Name * * This function adds backticks if the table name has a period * in it. Some DBs will get cranky unless periods are escaped * * @access private * @param string the table name * @return string */ function _escape_table($table) { if (stristr($table, '.')) { $table = preg_replace("/\./", "`.`", $table); } return $table; } // -------------------------------------------------------------------- /** * Insert statement * * Generates a platform-specific insert string from the supplied data * * @access public * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ function _insert($table, $keys, $values) { return "INSERT INTO ".$this->_escape_table($table)." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")"; } // -------------------------------------------------------------------- /** * Update statement * * Generates a platform-specific update string from the supplied data * * @access public * @param string the table name * @param array the update data * @param array the where clause * @return string */ function _update($table, $values, $where, $limit = FALSE) { foreach($values as $key => $val) { $valstr[] = $key." = ".$val; } $limit = (!$limit) ? '' : ' LIMIT '.$limit; return "UPDATE ".$this->_escape_table($table)." SET ".implode(', ', $valstr)." WHERE ".implode(" ", $where).$limit; } // -------------------------------------------------------------------- /** * Delete statement * * Generates a platform-specific delete string from the supplied data * * @access public * @param string the table name * @param array the where clause * @return string */ function _delete($table, $where) { return "DELETE FROM ".$this->_escape_table($table)." WHERE ".implode(" ", $where); } // -------------------------------------------------------------------- /** * Limit string * * Generates a platform-specific LIMIT clause * * @access public * @param string the sql query string * @param integer the number of rows to limit the query to * @param integer the offset value * @return string */ function _limit($sql, $limit, $offset) { if ($offset == 0) { $offset = ''; } else { $offset .= ", "; } return $sql."LIMIT ".$offset.$limit; } // -------------------------------------------------------------------- /** * Close DB Connection * * @access public * @param resource * @return void */ function _close($conn_id) { @sqlite_close($conn_id); } } ?>