Subversion Repositories SmartDukaan

<?php

/**

 * SQLite layer for DBO

 *

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @package       Cake.Model.Datasource.Database

 * @since         CakePHP(tm) v 0.9.0

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

App::uses('DboSource', 'Model/Datasource');

App::uses('String', 'Utility');

/**

 * DBO implementation for the SQLite3 DBMS.

 *

 * A DboSource adapter for SQLite 3 using PDO

 *

 * @package       Cake.Model.Datasource.Database

 */

class Sqlite extends DboSource {

/**

 * Datasource Description

 *

 * @var string

 */

	public $description = "SQLite DBO Driver";

/**

 * Quote Start

 *

 * @var string

 */

	public $startQuote = '"';

/**

 * Quote End

 *

 * @var string

 */

	public $endQuote = '"';

/**

 * Base configuration settings for SQLite3 driver

 *

 * @var array

 */

	protected $_baseConfig = array(

		'persistent' => false,

		'database' => null,

		'flags' => array()

	);

/**

 * SQLite3 column definition

 *

 * @var array

 */

	public $columns = array(

		'primary_key' => array('name' => 'integer primary key autoincrement'),

		'string' => array('name' => 'varchar', 'limit' => '255'),

		'text' => array('name' => 'text'),

		'integer' => array('name' => 'integer', 'limit' => null, 'formatter' => 'intval'),

		'biginteger' => array('name' => 'bigint', 'limit' => 20),

		'float' => array('name' => 'float', 'formatter' => 'floatval'),

		'decimal' => array('name' => 'decimal', 'formatter' => 'floatval'),

		'datetime' => array('name' => 'datetime', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),

		'timestamp' => array('name' => 'timestamp', 'format' => 'Y-m-d H:i:s', 'formatter' => 'date'),

		'time' => array('name' => 'time', 'format' => 'H:i:s', 'formatter' => 'date'),

		'date' => array('name' => 'date', 'format' => 'Y-m-d', 'formatter' => 'date'),

		'binary' => array('name' => 'blob'),

		'boolean' => array('name' => 'boolean')

	);

/**

 * List of engine specific additional field parameters used on table creating

 *

 * @var array

 */

	public $fieldParameters = array(

		'collate' => array(

			'value' => 'COLLATE',

			'quote' => false,

			'join' => ' ',

			'column' => 'Collate',

			'position' => 'afterDefault',

			'options' => array(

				'BINARY', 'NOCASE', 'RTRIM'

			)

		),

	);

/**

 * Connects to the database using config['database'] as a filename.

 *

 * @return bool

 * @throws MissingConnectionException

 */

	public function connect() {

		$config = $this->config;

		$flags = $config['flags'] + array(

			PDO::ATTR_PERSISTENT => $config['persistent'],

			PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION

		);

		try {

			$this->_connection = new PDO('sqlite:' . $config['database'], null, null, $flags);

			$this->connected = true;

		} catch(PDOException $e) {

			throw new MissingConnectionException(array(

				'class' => get_class($this),

				'message' => $e->getMessage()

			));

		}

		return $this->connected;

	}

/**

 * Check whether the SQLite extension is installed/loaded

 *

 * @return bool

 */

	public function enabled() {

		return in_array('sqlite', PDO::getAvailableDrivers());

	}

/**

 * Returns an array of tables in the database. If there are no tables, an error is raised and the application exits.

 *

 * @param mixed $data Unused.

 * @return array Array of table names in the database

 */

	public function listSources($data = null) {

		$cache = parent::listSources();

		if ($cache) {

			return $cache;

		}

		$result = $this->fetchAll("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name;", false);

		if (!$result || empty($result)) {

			return array();

		}

		$tables = array();

		foreach ($result as $table) {

			$tables[] = $table[0]['name'];

		}

		parent::listSources($tables);

		return $tables;

	}

/**

 * Returns an array of the fields in given table name.

 *

 * @param Model|string $model Either the model or table name you want described.

 * @return array Fields in table. Keys are name and type

 */

	public function describe($model) {

		$table = $this->fullTableName($model, false, false);

		$cache = parent::describe($table);

		if ($cache) {

			return $cache;

		}

		$fields = array();

		$result = $this->_execute(

			'PRAGMA table_info(' . $this->value($table, 'string') . ')'

		);

		foreach ($result as $column) {

			$column = (array)$column;

			$default = ($column['dflt_value'] === 'NULL') ? null : trim($column['dflt_value'], "'");

			$fields[$column['name']] = array(

				'type' => $this->column($column['type']),

				'null' => !$column['notnull'],

				'default' => $default,

				'length' => $this->length($column['type'])

			);

			if ($column['pk'] == 1) {

				$fields[$column['name']]['key'] = $this->index['PRI'];

				$fields[$column['name']]['null'] = false;

				if (empty($fields[$column['name']]['length'])) {

					$fields[$column['name']]['length'] = 11;

				}

			}

		}

		$result->closeCursor();

		$this->_cacheDescription($table, $fields);

		return $fields;

	}

/**

 * Generates and executes an SQL UPDATE statement for given model, fields, and values.

 *

 * @param Model $model The model instance to update.

 * @param array $fields The fields to update.

 * @param array $values The values to set columns to.

 * @param mixed $conditions array of conditions to use.

 * @return array

 */

	public function update(Model $model, $fields = array(), $values = null, $conditions = null) {

		if (empty($values) && !empty($fields)) {

			foreach ($fields as $field => $value) {

				if (strpos($field, $model->alias . '.') !== false) {

					unset($fields[$field]);

					$field = str_replace($model->alias . '.', "", $field);

					$field = str_replace($model->alias . '.', "", $field);

					$fields[$field] = $value;

				}

			}

		}

		return parent::update($model, $fields, $values, $conditions);

	}

/**

 * Deletes all the records in a table and resets the count of the auto-incrementing

 * primary key, where applicable.

 *

 * @param string|Model $table A string or model class representing the table to be truncated

 * @return bool SQL TRUNCATE TABLE statement, false if not applicable.

 */

	public function truncate($table) {

		if (in_array('sqlite_sequence', $this->listSources())) {

			$this->_execute('DELETE FROM sqlite_sequence where name=' . $this->startQuote . $this->fullTableName($table, false, false) . $this->endQuote);

		}

		return $this->execute('DELETE FROM ' . $this->fullTableName($table));

	}

/**

 * Converts database-layer column types to basic types

 *

 * @param string $real Real database-layer column type (i.e. "varchar(255)")

 * @return string Abstract column type (i.e. "string")

 */

	public function column($real) {

		if (is_array($real)) {

			$col = $real['name'];

			if (isset($real['limit'])) {

				$col .= '(' . $real['limit'] . ')';

			}

			return $col;

		}

		$col = strtolower(str_replace(')', '', $real));

		if (strpos($col, '(') !== false) {

			list($col) = explode('(', $col);

		}

		$standard = array(

			'text',

			'integer',

			'float',

			'boolean',

			'timestamp',

			'date',

			'datetime',

			'time'

		);

		if (in_array($col, $standard)) {

			return $col;

		}

		if ($col === 'bigint') {

			return 'biginteger';

		}

		if (strpos($col, 'char') !== false) {

			return 'string';

		}

		if (in_array($col, array('blob', 'clob'))) {

			return 'binary';

		}

		if (strpos($col, 'numeric') !== false || strpos($col, 'decimal') !== false) {

			return 'decimal';

		}

		return 'text';

	}

/**

 * Generate ResultSet

 *

 * @param mixed $results The results to modify.

 * @return void

 */

	public function resultSet($results) {

		$this->results = $results;

		$this->map = array();

		$numFields = $results->columnCount();

		$index = 0;

		$j = 0;

		// PDO::getColumnMeta is experimental and does not work with sqlite3,

		// so try to figure it out based on the querystring

		$querystring = $results->queryString;

		if (stripos($querystring, 'SELECT') === 0) {

			$last = strripos($querystring, 'FROM');

			if ($last !== false) {

				$selectpart = substr($querystring, 7, $last - 8);

				$selects = String::tokenize($selectpart, ',', '(', ')');

			}

		} elseif (strpos($querystring, 'PRAGMA table_info') === 0) {

			$selects = array('cid', 'name', 'type', 'notnull', 'dflt_value', 'pk');

		} elseif (strpos($querystring, 'PRAGMA index_list') === 0) {

			$selects = array('seq', 'name', 'unique');

		} elseif (strpos($querystring, 'PRAGMA index_info') === 0) {

			$selects = array('seqno', 'cid', 'name');

		}

		while ($j < $numFields) {

			if (!isset($selects[$j])) {

				$j++;

				continue;

			}

			if (preg_match('/\bAS\s+(.*)/i', $selects[$j], $matches)) {

				$columnName = trim($matches[1], '"');

			} else {

				$columnName = trim(str_replace('"', '', $selects[$j]));

			}

			if (strpos($selects[$j], 'DISTINCT') === 0) {

				$columnName = str_ireplace('DISTINCT', '', $columnName);

			}

			$metaType = false;

			try {

				$metaData = (array)$results->getColumnMeta($j);

				if (!empty($metaData['sqlite:decl_type'])) {

					$metaType = trim($metaData['sqlite:decl_type']);

				}

			} catch (Exception $e) {

			}

			if (strpos($columnName, '.')) {

				$parts = explode('.', $columnName);

				$this->map[$index++] = array(trim($parts[0]), trim($parts[1]), $metaType);

			} else {

				$this->map[$index++] = array(0, $columnName, $metaType);

			}

			$j++;

		}

	}

/**

 * Fetches the next row from the current result set

 *

 * @return mixed array with results fetched and mapped to column names or false if there is no results left to fetch

 */

	public function fetchResult() {

		if ($row = $this->_result->fetch(PDO::FETCH_NUM)) {

			$resultRow = array();

			foreach ($this->map as $col => $meta) {

				list($table, $column, $type) = $meta;

				$resultRow[$table][$column] = $row[$col];

				if ($type === 'boolean' && $row[$col] !== null) {

					$resultRow[$table][$column] = $this->boolean($resultRow[$table][$column]);

				}

			}

			return $resultRow;

		}

		$this->_result->closeCursor();

		return false;

	}

/**

 * Returns a limit statement in the correct format for the particular database.

 *

 * @param int $limit Limit of results returned

 * @param int $offset Offset from which to start results

 * @return string SQL limit/offset statement

 */

	public function limit($limit, $offset = null) {

		if ($limit) {

			$rt = sprintf(' LIMIT %u', $limit);

			if ($offset) {

				$rt .= sprintf(' OFFSET %u', $offset);

			}

			return $rt;

		}

		return null;

	}

/**

 * Generate a database-native column schema string

 *

 * @param array $column An array structured like the following: array('name'=>'value', 'type'=>'value'[, options]),

 *    where options can be 'default', 'length', or 'key'.

 * @return string

 */

	public function buildColumn($column) {

		$name = $type = null;

		$column += array('null' => true);

		extract($column);

		if (empty($name) || empty($type)) {

			trigger_error(__d('cake_dev', 'Column name or type not defined in schema'), E_USER_WARNING);

			return null;

		}

		if (!isset($this->columns[$type])) {

			trigger_error(__d('cake_dev', 'Column type %s does not exist', $type), E_USER_WARNING);

			return null;

		}

		$isPrimary = (isset($column['key']) && $column['key'] === 'primary');

		if ($isPrimary && $type === 'integer') {

			return $this->name($name) . ' ' . $this->columns['primary_key']['name'];

		}

		$out = parent::buildColumn($column);

		if ($isPrimary && $type === 'biginteger') {

			$replacement = 'PRIMARY KEY';

			if ($column['null'] === false) {

				$replacement = 'NOT NULL ' . $replacement;

			}

			return str_replace($this->columns['primary_key']['name'], $replacement, $out);

		}

		return $out;

	}

/**

 * Sets the database encoding

 *

 * @param string $enc Database encoding

 * @return bool

 */

	public function setEncoding($enc) {

		if (!in_array($enc, array("UTF-8", "UTF-16", "UTF-16le", "UTF-16be"))) {

			return false;

		}

		return $this->_execute("PRAGMA encoding = \"{$enc}\"") !== false;

	}

/**

 * Gets the database encoding

 *

 * @return string The database encoding

 */

	public function getEncoding() {

		return $this->fetchRow('PRAGMA encoding');

	}

/**

 * Removes redundant primary key indexes, as they are handled in the column def of the key.

 *

 * @param array $indexes The indexes to build.

 * @param string $table The table name.

 * @return string The completed index.

 */

	public function buildIndex($indexes, $table = null) {

		$join = array();

		$table = str_replace('"', '', $table);

		list($dbname, $table) = explode('.', $table);

		$dbname = $this->name($dbname);

		foreach ($indexes as $name => $value) {

			if ($name === 'PRIMARY') {

				continue;

			}

			$out = 'CREATE ';

			if (!empty($value['unique'])) {

				$out .= 'UNIQUE ';

			}

			if (is_array($value['column'])) {

				$value['column'] = implode(', ', array_map(array(&$this, 'name'), $value['column']));

			} else {

				$value['column'] = $this->name($value['column']);

			}

			$t = trim($table, '"');

			$indexname = $this->name($t . '_' . $name);

			$table = $this->name($table);

			$out .= "INDEX {$dbname}.{$indexname} ON {$table}({$value['column']});";

			$join[] = $out;

		}

		return $join;

	}

/**

 * Overrides DboSource::index to handle SQLite index introspection

 * Returns an array of the indexes in given table name.

 *

 * @param string $model Name of model to inspect

 * @return array Fields in table. Keys are column and unique

 */

	public function index($model) {

		$index = array();

		$table = $this->fullTableName($model, false, false);

		if ($table) {

			$indexes = $this->query('PRAGMA index_list(' . $table . ')');

			if (is_bool($indexes)) {

				return array();

			}

			foreach ($indexes as $info) {

				$key = array_pop($info);

				$keyInfo = $this->query('PRAGMA index_info("' . $key['name'] . '")');

				foreach ($keyInfo as $keyCol) {

					if (!isset($index[$key['name']])) {

						$col = array();

						if (preg_match('/autoindex/', $key['name'])) {

							$key['name'] = 'PRIMARY';

						}

						$index[$key['name']]['column'] = $keyCol[0]['name'];

						$index[$key['name']]['unique'] = intval($key['unique'] == 1);

					} else {

						if (!is_array($index[$key['name']]['column'])) {

							$col[] = $index[$key['name']]['column'];

						}

						$col[] = $keyCol[0]['name'];

						$index[$key['name']]['column'] = $col;

					}

				}

			}

		}

		return $index;

	}

/**

 * Overrides DboSource::renderStatement to handle schema generation with SQLite-style indexes

 *

 * @param string $type The type of statement being rendered.

 * @param array $data The data to convert to SQL.

 * @return string

 */

	public function renderStatement($type, $data) {

		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 bool

 */

	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 bool

 */

	public function nestedTransactionSupported() {

		return $this->useNestedTransactions && version_compare($this->getVersion(), '3.6.8', '>=');

	}

}