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<?php defined('SYSPATH') OR die('No direct access allowed.');
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/*
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* Class: Database_PdoSqlite_Driver
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* Provides specific database items for Sqlite.
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*
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* Connection string should be, eg: "pdosqlite://path/to/database.db"
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*
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* Version 1.0 alpha
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* author - Doutu, updated by gregmac
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* copyright - (c) BSD
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* license - <no>
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*/
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class Database_Pdosqlite_Driver extends Database_Driver {
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// Database connection link
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protected $link;
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protected $db_config;
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/*
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* Constructor: __construct
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* Sets up the config for the class.
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*
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* Parameters:
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* config - database configuration
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*
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*/
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public function __construct($config)
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{
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$this->db_config = $config;
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Log::add('debug', 'PDO:Sqlite Database Driver Initialized');
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}
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public function connect()
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{
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// Import the connect variables
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extract($this->db_config['connection']);
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try
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{
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$this->link = new PDO('sqlite:'.$socket.$database, $user, $pass,
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array(PDO::ATTR_PERSISTENT => $this->db_config['persistent']));
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$this->link->setAttribute(PDO::ATTR_CASE, PDO::CASE_NATURAL);
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//$this->link->query('PRAGMA count_changes=1;');
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if ($charset = $this->db_config['character_set'])
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{
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$this->set_charset($charset);
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}
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}
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catch (PDOException $e)
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{
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throw new Kohana_Database_Exception('database.error', $e->getMessage());
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}
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// Clear password after successful connect
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$this->db_config['connection']['pass'] = NULL;
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return $this->link;
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}
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public function query($sql)
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{
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try
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{
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$sth = $this->link->prepare($sql);
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}
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catch (PDOException $e)
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{
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throw new Kohana_Database_Exception('database.error', $e->getMessage());
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}
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return new Pdosqlite_Result($sth, $this->link, $this->db_config['object'], $sql);
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}
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public function set_charset($charset)
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{
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$this->link->query('PRAGMA encoding = '.$this->escape_str($charset));
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}
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public function escape_table($table)
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{
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if ( ! $this->db_config['escape'])
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return $table;
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return '`'.str_replace('.', '`.`', $table).'`';
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}
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public function escape_column($column)
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{
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if ( ! $this->db_config['escape'])
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return $column;
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if ($column == '*')
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return $column;
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// This matches any functions we support to SELECT.
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if ( preg_match('/(avg|count|sum|max|min)\(\s*(.*)\s*\)(\s*as\s*(.+)?)?/i', $column, $matches))
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{
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if ( count($matches) == 3)
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{
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return $matches[1].'('.$this->escape_column($matches[2]).')';
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}
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else if ( count($matches) == 5)
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{
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return $matches[1].'('.$this->escape_column($matches[2]).') AS '.$this->escape_column($matches[2]);
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}
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}
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// This matches any modifiers we support to SELECT.
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if ( ! preg_match('/\b(?:rand|all|distinct(?:row)?|high_priority|sql_(?:small_result|b(?:ig_result|uffer_result)|no_cache|ca(?:che|lc_found_rows)))\s/i', $column))
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{
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if (stripos($column, ' AS ') !== FALSE)
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{
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// Force 'AS' to uppercase
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$column = str_ireplace(' AS ', ' AS ', $column);
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// Runs escape_column on both sides of an AS statement
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$column = array_map(array($this, __FUNCTION__), explode(' AS ', $column));
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// Re-create the AS statement
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return implode(' AS ', $column);
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}
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return preg_replace('/[^.*]+/', '`$0`', $column);
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}
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$parts = explode(' ', $column);
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$column = '';
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for ($i = 0, $c = count($parts); $i < $c; $i++)
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{
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// The column is always last
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if ($i == ($c - 1))
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{
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$column .= preg_replace('/[^.*]+/', '`$0`', $parts[$i]);
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}
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else // otherwise, it's a modifier
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{
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$column .= $parts[$i].' ';
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}
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}
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return $column;
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}
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public function limit($limit, $offset = 0)
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{
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return 'LIMIT '.$offset.', '.$limit;
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}
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public function compile_select($database)
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{
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$sql = ($database['distinct'] == TRUE) ? 'SELECT DISTINCT ' : 'SELECT ';
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$sql .= (count($database['select']) > 0) ? implode(', ', $database['select']) : '*';
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if (count($database['from']) > 0)
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{
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$sql .= "\nFROM ";
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$sql .= implode(', ', $database['from']);
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}
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if (count($database['join']) > 0)
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{
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foreach($database['join'] AS $join)
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{
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$sql .= "\n".$join['type'].'JOIN '.implode(', ', $join['tables']).' ON '.$join['conditions'];
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}
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}
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if (count($database['where']) > 0)
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{
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$sql .= "\nWHERE ";
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}
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$sql .= implode("\n", $database['where']);
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if (count($database['groupby']) > 0)
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{
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$sql .= "\nGROUP BY ";
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$sql .= implode(', ', $database['groupby']);
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}
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if (count($database['having']) > 0)
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{
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$sql .= "\nHAVING ";
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$sql .= implode("\n", $database['having']);
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}
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if (count($database['orderby']) > 0)
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{
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$sql .= "\nORDER BY ";
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$sql .= implode(', ', $database['orderby']);
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}
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if (is_numeric($database['limit']))
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{
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$sql .= "\n";
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$sql .= $this->limit($database['limit'], $database['offset']);
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}
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return $sql;
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}
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public function escape_str($str)
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{
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if ( ! $this->db_config['escape'])
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return $str;
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if (function_exists('sqlite_escape_string'))
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{
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$res = sqlite_escape_string($str);
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}
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else
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{
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$res = str_replace("'", "''", $str);
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}
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return $res;
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}
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public function list_tables()
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{
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$sql = "SELECT `name` FROM `sqlite_master` WHERE `type`='table' ORDER BY `name`;";
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try
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{
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$result = $this->query($sql)->result(FALSE, PDO::FETCH_ASSOC);
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$tables = array();
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foreach ($result as $row)
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{
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$tables[] = current($row);
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}
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}
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catch (PDOException $e)
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{
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throw new Kohana_Database_Exception('database.error', $e->getMessage());
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}
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return $tables;
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}
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public function show_error()
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{
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$err = $this->link->errorInfo();
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return isset($err[2]) ? $err[2] : 'Unknown error!';
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}
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public function list_fields($table, $query = FALSE)
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{
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static $tables;
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if (is_object($query))
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{
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if (empty($tables[$table]))
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{
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$tables[$table] = array();
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foreach ($query->result() as $row)
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{
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$tables[$table][] = $row->name;
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}
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}
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return $tables[$table];
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}
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else
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{
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$result = $this->link->query( 'PRAGMA table_info('.$this->escape_table($table).')' );
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foreach ($result as $row)
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{
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$tables[$table][$row['name']] = $this->sql_type($row['type']);
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}
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return $tables[$table];
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}
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}
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public function field_data($table)
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{
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Log::add('error', 'This method is under developing');
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}
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/**
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* Version number query string
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*
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* @access public
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* @return string
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*/
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function version()
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{
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return $this->link->getAttribute(constant("PDO::ATTR_SERVER_VERSION"));
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}
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} // End Database_PdoSqlite_Driver Class
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/*
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* PDO-sqlite Result
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*/
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class Pdosqlite_Result extends Database_Result {
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// Data fetching types
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protected $fetch_type = PDO::FETCH_OBJ;
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protected $return_type = PDO::FETCH_ASSOC;
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/**
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* Sets up the result variables.
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*
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* @param resource query result
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* @param resource database link
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* @param boolean return objects or arrays
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* @param string SQL query that was run
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*/
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public function __construct($result, $link, $object = TRUE, $sql)
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{
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if (is_object($result) OR $result = $link->prepare($sql))
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{
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// run the query. Return true if success, false otherwise
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if( ! $result->execute())
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{
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// Throw Kohana Exception with error message. See PDOStatement errorInfo() method
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$arr_infos = $result->errorInfo();
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throw new Kohana_Database_Exception('database.error', $arr_infos[2]);
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}
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if (preg_match('/^SELECT|PRAGMA|EXPLAIN/i', $sql))
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{
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$this->result = $result;
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$this->current_row = 0;
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$this->total_rows = $this->sqlite_row_count();
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$this->fetch_type = ($object === TRUE) ? PDO::FETCH_OBJ : PDO::FETCH_ASSOC;
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}
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elseif (preg_match('/^DELETE|INSERT|UPDATE/i', $sql))
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{
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$this->insert_id = $link->lastInsertId();
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$this->total_rows = $result->rowCount();
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}
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}
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else
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{
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// SQL error
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throw new Kohana_Database_Exception('database.error', $link->errorInfo().' - '.$sql);
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}
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// Set result type
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$this->result($object);
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// Store the SQL
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$this->sql = $sql;
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}
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private function sqlite_row_count()
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{
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$count = 0;
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while ($this->result->fetch())
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{
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$count++;
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}
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// The query must be re-fetched now.
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$this->result->execute();
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return $count;
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}
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/*
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* Destructor: __destruct
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* Magic __destruct function, frees the result.
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*/
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public function __destruct()
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{
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if (is_object($this->result))
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{
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$this->result->closeCursor();
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$this->result = NULL;
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}
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}
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public function result($object = TRUE, $type = PDO::FETCH_BOTH)
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{
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$this->fetch_type = (bool) $object ? PDO::FETCH_OBJ : PDO::FETCH_BOTH;
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if ($this->fetch_type == PDO::FETCH_OBJ)
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{
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$this->return_type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
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}
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else
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{
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$this->return_type = $type;
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}
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return $this;
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}
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public function as_array($object = NULL, $type = PDO::FETCH_ASSOC)
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{
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return $this->result_array($object, $type);
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}
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public function result_array($object = NULL, $type = PDO::FETCH_ASSOC)
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{
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$rows = array();
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if (is_string($object))
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{
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$fetch = $object;
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}
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elseif (is_bool($object))
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{
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if ($object === TRUE)
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{
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$fetch = PDO::FETCH_OBJ;
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// NOTE - The class set by $type must be defined before fetching the result,
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// autoloading is disabled to save a lot of stupid overhead.
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$type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
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}
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else
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{
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$fetch = PDO::FETCH_OBJ;
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}
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}
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else
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{
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// Use the default config values
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$fetch = $this->fetch_type;
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if ($fetch == PDO::FETCH_OBJ)
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{
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$type = (is_string($type) AND Kohana::auto_load($type)) ? $type : 'stdClass';
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}
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}
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try
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{
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while ($row = $this->result->fetch($fetch))
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{
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$rows[] = $row;
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}
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}
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catch(PDOException $e)
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{
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throw new Kohana_Database_Exception('database.error', $e->getMessage());
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return FALSE;
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}
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return $rows;
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}
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public function list_fields()
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{
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$field_names = array();
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for ($i = 0, $max = $this->result->columnCount(); $i < $max; $i++)
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{
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$info = $this->result->getColumnMeta($i);
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$field_names[] = $info['name'];
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}
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return $field_names;
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}
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public function seek($offset)
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{
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// To request a scrollable cursor for your PDOStatement object, you must
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// set the PDO::ATTR_CURSOR attribute to PDO::CURSOR_SCROLL when you
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// prepare the statement.
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Log::add('error', get_class($this).' does not support scrollable cursors, '.__FUNCTION__.' call ignored');
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return FALSE;
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}
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public function offsetGet($offset)
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{
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try
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{
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return $this->result->fetch($this->fetch_type, PDO::FETCH_ORI_ABS, $offset);
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}
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catch(PDOException $e)
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{
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throw new Kohana_Database_Exception('database.error', $e->getMessage());
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}
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}
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public function rewind()
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{
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// Same problem that seek() has, see above.
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return $this->seek(0);
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}
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} // End PdoSqlite_Result Class
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