586 lines
15 KiB
PHP
586 lines
15 KiB
PHP
<?php
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/**
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* SQLite layer for DBO
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.Model.Datasource.Database
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* @since CakePHP(tm) v 0.9.0
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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App::uses('DboSource', 'Model/Datasource');
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App::uses('String', 'Utility');
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/**
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* DBO implementation for the SQLite3 DBMS.
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*
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* A DboSource adapter for SQLite 3 using PDO
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*
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* @package Cake.Model.Datasource.Database
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*/
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class Sqlite extends DboSource {
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/**
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* Datasource Description
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*
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* @var string
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*/
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public $description = "SQLite DBO Driver";
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/**
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* Quote Start
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*
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* @var string
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*/
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public $startQuote = '"';
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/**
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* Quote End
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*
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* @var string
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*/
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public $endQuote = '"';
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/**
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* Base configuration settings for SQLite3 driver
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*
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* @var array
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*/
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protected $_baseConfig = array(
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'persistent' => false,
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'database' => null
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);
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/**
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* SQLite3 column definition
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*
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* @var array
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*/
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public $columns = array(
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'primary_key' => array('name' => 'integer primary key autoincrement'),
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'string' => array('name' => 'varchar', 'limit' => '255'),
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'text' => array('name' => 'text'),
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'integer' => array('name' => 'integer', 'limit' => null, 'formatter' => 'intval'),
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'biginteger' => array('name' => 'bigint', 'limit' => 20),
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'float' => array('name' => 'float', 'formatter' => 'floatval'),
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'datetime' => array('name' => 'datetime', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
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'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),
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'time' => array('name' => 'time', 'format' => 'H:i:s', 'formatter' => 'date'),
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'date' => array('name' => 'date', 'format' => 'Y-m-d', 'formatter' => 'date'),
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'binary' => array('name' => 'blob'),
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'boolean' => array('name' => 'boolean')
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);
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/**
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* List of engine specific additional field parameters used on table creating
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*
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* @var array
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*/
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public $fieldParameters = array(
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'collate' => array(
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'value' => 'COLLATE',
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'quote' => false,
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'join' => ' ',
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'column' => 'Collate',
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'position' => 'afterDefault',
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'options' => array(
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'BINARY', 'NOCASE', 'RTRIM'
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)
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),
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);
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/**
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* Connects to the database using config['database'] as a filename.
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*
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* @return boolean
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* @throws MissingConnectionException
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*/
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public function connect() {
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$config = $this->config;
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$flags = array(
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PDO::ATTR_PERSISTENT => $config['persistent'],
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PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
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);
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try {
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$this->_connection = new PDO('sqlite:' . $config['database'], null, null, $flags);
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$this->connected = true;
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} catch(PDOException $e) {
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throw new MissingConnectionException(array(
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'class' => get_class($this),
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'message' => $e->getMessage()
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));
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}
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return $this->connected;
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}
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/**
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* Check whether the SQLite extension is installed/loaded
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*
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* @return boolean
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*/
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public function enabled() {
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return in_array('sqlite', PDO::getAvailableDrivers());
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}
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/**
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* Returns an array of tables in the database. If there are no tables, an error is raised and the application exits.
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*
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* @param mixed $data
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* @return array Array of table names in the database
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*/
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public function listSources($data = null) {
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$cache = parent::listSources();
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if ($cache) {
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return $cache;
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}
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$result = $this->fetchAll("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name;", false);
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if (!$result || empty($result)) {
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return array();
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}
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$tables = array();
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foreach ($result as $table) {
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$tables[] = $table[0]['name'];
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}
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parent::listSources($tables);
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return $tables;
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}
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/**
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* Returns an array of the fields in given table name.
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*
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* @param Model|string $model Either the model or table name you want described.
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* @return array Fields in table. Keys are name and type
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*/
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public function describe($model) {
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$table = $this->fullTableName($model, false, false);
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$cache = parent::describe($table);
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if ($cache) {
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return $cache;
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}
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$fields = array();
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$result = $this->_execute(
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'PRAGMA table_info(' . $this->value($table, 'string') . ')'
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);
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foreach ($result as $column) {
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$column = (array)$column;
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$default = ($column['dflt_value'] === 'NULL') ? null : trim($column['dflt_value'], "'");
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$fields[$column['name']] = array(
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'type' => $this->column($column['type']),
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'null' => !$column['notnull'],
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'default' => $default,
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'length' => $this->length($column['type'])
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);
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if ($column['pk'] == 1) {
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$fields[$column['name']]['key'] = $this->index['PRI'];
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$fields[$column['name']]['null'] = false;
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if (empty($fields[$column['name']]['length'])) {
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$fields[$column['name']]['length'] = 11;
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}
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}
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}
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$result->closeCursor();
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$this->_cacheDescription($table, $fields);
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return $fields;
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}
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/**
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* Generates and executes an SQL UPDATE statement for given model, fields, and values.
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*
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* @param Model $model
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* @param array $fields
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* @param array $values
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* @param mixed $conditions
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* @return array
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*/
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public function update(Model $model, $fields = array(), $values = null, $conditions = null) {
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if (empty($values) && !empty($fields)) {
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foreach ($fields as $field => $value) {
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if (strpos($field, $model->alias . '.') !== false) {
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unset($fields[$field]);
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$field = str_replace($model->alias . '.', "", $field);
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$field = str_replace($model->alias . '.', "", $field);
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$fields[$field] = $value;
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}
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}
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}
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return parent::update($model, $fields, $values, $conditions);
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}
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/**
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* Deletes all the records in a table and resets the count of the auto-incrementing
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* primary key, where applicable.
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*
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* @param string|Model $table A string or model class representing the table to be truncated
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* @return boolean SQL TRUNCATE TABLE statement, false if not applicable.
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*/
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public function truncate($table) {
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if (in_array('sqlite_sequence', $this->listSources())) {
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$this->_execute('DELETE FROM sqlite_sequence where name=' . $this->startQuote . $this->fullTableName($table, false, false) . $this->endQuote);
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}
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return $this->execute('DELETE FROM ' . $this->fullTableName($table));
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}
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/**
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* Converts database-layer column types to basic types
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*
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* @param string $real Real database-layer column type (i.e. "varchar(255)")
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* @return string Abstract column type (i.e. "string")
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*/
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public function column($real) {
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if (is_array($real)) {
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$col = $real['name'];
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if (isset($real['limit'])) {
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$col .= '(' . $real['limit'] . ')';
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}
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return $col;
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}
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$col = strtolower(str_replace(')', '', $real));
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$limit = null;
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if (strpos($col, '(') !== false) {
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list($col, $limit) = explode('(', $col);
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}
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$standard = array(
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'text',
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'integer',
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'float',
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'boolean',
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'timestamp',
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'date',
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'datetime',
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'time'
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);
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if (in_array($col, $standard)) {
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return $col;
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}
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if ($col === 'bigint') {
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return 'biginteger';
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}
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if (strpos($col, 'char') !== false) {
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return 'string';
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}
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if (in_array($col, array('blob', 'clob'))) {
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return 'binary';
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}
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if (strpos($col, 'numeric') !== false || strpos($col, 'decimal') !== false) {
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return 'float';
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}
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return 'text';
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}
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/**
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* Generate ResultSet
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*
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* @param mixed $results
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* @return void
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*/
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public function resultSet($results) {
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$this->results = $results;
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$this->map = array();
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$numFields = $results->columnCount();
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$index = 0;
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$j = 0;
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//PDO::getColumnMeta is experimental and does not work with sqlite3,
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// so try to figure it out based on the querystring
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$querystring = $results->queryString;
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if (stripos($querystring, 'SELECT') === 0) {
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$last = strripos($querystring, 'FROM');
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if ($last !== false) {
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$selectpart = substr($querystring, 7, $last - 8);
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$selects = String::tokenize($selectpart, ',', '(', ')');
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}
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} elseif (strpos($querystring, 'PRAGMA table_info') === 0) {
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$selects = array('cid', 'name', 'type', 'notnull', 'dflt_value', 'pk');
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} elseif (strpos($querystring, 'PRAGMA index_list') === 0) {
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$selects = array('seq', 'name', 'unique');
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} elseif (strpos($querystring, 'PRAGMA index_info') === 0) {
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$selects = array('seqno', 'cid', 'name');
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}
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while ($j < $numFields) {
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if (!isset($selects[$j])) {
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$j++;
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continue;
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}
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if (preg_match('/\bAS\s+(.*)/i', $selects[$j], $matches)) {
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$columnName = trim($matches[1], '"');
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} else {
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$columnName = trim(str_replace('"', '', $selects[$j]));
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}
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if (strpos($selects[$j], 'DISTINCT') === 0) {
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$columnName = str_ireplace('DISTINCT', '', $columnName);
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}
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$metaType = false;
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try {
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$metaData = (array)$results->getColumnMeta($j);
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if (!empty($metaData['sqlite:decl_type'])) {
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$metaType = trim($metaData['sqlite:decl_type']);
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}
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} catch (Exception $e) {
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}
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if (strpos($columnName, '.')) {
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$parts = explode('.', $columnName);
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$this->map[$index++] = array(trim($parts[0]), trim($parts[1]), $metaType);
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} else {
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$this->map[$index++] = array(0, $columnName, $metaType);
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}
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$j++;
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}
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}
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/**
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* Fetches the next row from the current result set
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*
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* @return mixed array with results fetched and mapped to column names or false if there is no results left to fetch
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*/
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public function fetchResult() {
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if ($row = $this->_result->fetch(PDO::FETCH_NUM)) {
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$resultRow = array();
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foreach ($this->map as $col => $meta) {
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list($table, $column, $type) = $meta;
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$resultRow[$table][$column] = $row[$col];
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if ($type === 'boolean' && $row[$col] !== null) {
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$resultRow[$table][$column] = $this->boolean($resultRow[$table][$column]);
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}
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}
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return $resultRow;
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}
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$this->_result->closeCursor();
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return false;
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}
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/**
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* Returns a limit statement in the correct format for the particular database.
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*
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* @param integer $limit Limit of results returned
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* @param integer $offset Offset from which to start results
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* @return string SQL limit/offset statement
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*/
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public function limit($limit, $offset = null) {
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if ($limit) {
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$rt = sprintf(' LIMIT %u', $limit);
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if ($offset) {
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$rt .= sprintf(' OFFSET %u', $offset);
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}
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return $rt;
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}
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return null;
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}
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/**
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* Generate a database-native column schema string
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*
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* @param array $column An array structured like the following: array('name'=>'value', 'type'=>'value'[, options]),
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* where options can be 'default', 'length', or 'key'.
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* @return string
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*/
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public function buildColumn($column) {
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$name = $type = null;
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$column = array_merge(array('null' => true), $column);
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extract($column);
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if (empty($name) || empty($type)) {
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trigger_error(__d('cake_dev', 'Column name or type not defined in schema'), E_USER_WARNING);
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return null;
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}
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if (!isset($this->columns[$type])) {
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trigger_error(__d('cake_dev', 'Column type %s does not exist', $type), E_USER_WARNING);
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return null;
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}
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$isPrimary = (isset($column['key']) && $column['key'] === 'primary');
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if ($isPrimary && $type === 'integer') {
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return $this->name($name) . ' ' . $this->columns['primary_key']['name'];
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}
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$out = parent::buildColumn($column);
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if ($isPrimary && $type === 'biginteger') {
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$replacement = 'PRIMARY KEY';
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if ($column['null'] === false) {
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$replacement = 'NOT NULL ' . $replacement;
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}
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return str_replace($this->columns['primary_key']['name'], $replacement, $out);
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}
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return $out;
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}
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/**
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* Sets the database encoding
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*
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* @param string $enc Database encoding
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* @return boolean
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*/
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public function setEncoding($enc) {
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if (!in_array($enc, array("UTF-8", "UTF-16", "UTF-16le", "UTF-16be"))) {
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return false;
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}
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return $this->_execute("PRAGMA encoding = \"{$enc}\"") !== false;
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}
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/**
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* Gets the database encoding
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*
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* @return string The database encoding
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*/
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public function getEncoding() {
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return $this->fetchRow('PRAGMA encoding');
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}
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/**
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* Removes redundant primary key indexes, as they are handled in the column def of the key.
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*
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* @param array $indexes
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* @param string $table
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* @return string
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*/
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public function buildIndex($indexes, $table = null) {
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$join = array();
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$table = str_replace('"', '', $table);
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list($dbname, $table) = explode('.', $table);
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$dbname = $this->name($dbname);
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foreach ($indexes as $name => $value) {
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if ($name === 'PRIMARY') {
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continue;
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}
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$out = 'CREATE ';
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if (!empty($value['unique'])) {
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$out .= 'UNIQUE ';
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}
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if (is_array($value['column'])) {
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$value['column'] = implode(', ', array_map(array(&$this, 'name'), $value['column']));
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} else {
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$value['column'] = $this->name($value['column']);
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}
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$t = trim($table, '"');
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$indexname = $this->name($t . '_' . $name);
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$table = $this->name($table);
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$out .= "INDEX {$dbname}.{$indexname} ON {$table}({$value['column']});";
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$join[] = $out;
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}
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return $join;
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}
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/**
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* Overrides DboSource::index to handle SQLite index introspection
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* Returns an array of the indexes in given table name.
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*
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* @param string $model Name of model to inspect
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* @return array Fields in table. Keys are column and unique
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*/
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public function index($model) {
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$index = array();
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$table = $this->fullTableName($model, false, false);
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if ($table) {
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$indexes = $this->query('PRAGMA index_list(' . $table . ')');
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if (is_bool($indexes)) {
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return array();
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}
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foreach ($indexes as $info) {
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$key = array_pop($info);
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$keyInfo = $this->query('PRAGMA index_info("' . $key['name'] . '")');
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foreach ($keyInfo as $keyCol) {
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if (!isset($index[$key['name']])) {
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$col = array();
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if (preg_match('/autoindex/', $key['name'])) {
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$key['name'] = 'PRIMARY';
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}
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$index[$key['name']]['column'] = $keyCol[0]['name'];
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$index[$key['name']]['unique'] = intval($key['unique'] == 1);
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} else {
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if (!is_array($index[$key['name']]['column'])) {
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$col[] = $index[$key['name']]['column'];
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}
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$col[] = $keyCol[0]['name'];
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$index[$key['name']]['column'] = $col;
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}
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}
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}
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}
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return $index;
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}
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/**
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* Overrides DboSource::renderStatement to handle schema generation with SQLite-style indexes
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*
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* @param string $type
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* @param array $data
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* @return string
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*/
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public function renderStatement($type, $data) {
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switch (strtolower($type)) {
|
|
case 'schema':
|
|
extract($data);
|
|
if (is_array($columns)) {
|
|
$columns = "\t" . implode(",\n\t", array_filter($columns));
|
|
}
|
|
if (is_array($indexes)) {
|
|
$indexes = "\t" . implode("\n\t", array_filter($indexes));
|
|
}
|
|
return "CREATE TABLE {$table} (\n{$columns});\n{$indexes}";
|
|
default:
|
|
return parent::renderStatement($type, $data);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* PDO deals in objects, not resources, so overload accordingly.
|
|
*
|
|
* @return boolean
|
|
*/
|
|
public function hasResult() {
|
|
return is_object($this->_result);
|
|
}
|
|
|
|
/**
|
|
* Generate a "drop table" statement for the given table
|
|
*
|
|
* @param type $table Name of the table to drop
|
|
* @return string Drop table SQL statement
|
|
*/
|
|
protected function _dropTable($table) {
|
|
return 'DROP TABLE IF EXISTS ' . $this->fullTableName($table) . ";";
|
|
}
|
|
|
|
/**
|
|
* Gets the schema name
|
|
*
|
|
* @return string The schema name
|
|
*/
|
|
public function getSchemaName() {
|
|
return "main"; // Sqlite Datasource does not support multidb
|
|
}
|
|
|
|
/**
|
|
* Check if the server support nested transactions
|
|
*
|
|
* @return boolean
|
|
*/
|
|
public function nestedTransactionSupported() {
|
|
return $this->useNestedTransactions && version_compare($this->getVersion(), '3.6.8', '>=');
|
|
}
|
|
|
|
}
|