SQLite.php in Loft Data Grids 6.2

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vendor/phpoffice/phpexcel/Classes/PHPExcel/CachedObjectStorage/SQLite.php

<?php

/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2014 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_CachedObjectStorage
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    ##VERSION##, ##DATE##
 */

/**
 * PHPExcel_CachedObjectStorage_SQLite
 *
 * @category   PHPExcel
 * @package    PHPExcel_CachedObjectStorage
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {

  /**
   * Database table name
   *
   * @var string
   */
  private $_TableName = null;

  /**
   * Database handle
   *
   * @var resource
   */
  private $_DBHandle = null;

  /**
   * Store cell data in cache for the current cell object if it's "dirty",
   *     and the 'nullify' the current cell object
   *
   * @return	void
   * @throws	PHPExcel_Exception
   */
  protected function _storeData() {
    if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
      $this->_currentObject
        ->detach();
      if (!$this->_DBHandle
        ->queryExec("INSERT OR REPLACE INTO kvp_" . $this->_TableName . " VALUES('" . $this->_currentObjectID . "','" . sqlite_escape_string(serialize($this->_currentObject)) . "')")) {
        throw new PHPExcel_Exception(sqlite_error_string($this->_DBHandle
          ->lastError()));
      }
      $this->_currentCellIsDirty = false;
    }
    $this->_currentObjectID = $this->_currentObject = null;
  }

  //	function _storeData()

  /**
   * Add or Update a cell in cache identified by coordinate address
   *
   * @param	string			$pCoord		Coordinate address of the cell to update
   * @param	PHPExcel_Cell	$cell		Cell to update
   * @return	PHPExcel_Cell
   * @throws	PHPExcel_Exception
   */
  public function addCacheData($pCoord, PHPExcel_Cell $cell) {
    if ($pCoord !== $this->_currentObjectID && $this->_currentObjectID !== null) {
      $this
        ->_storeData();
    }
    $this->_currentObjectID = $pCoord;
    $this->_currentObject = $cell;
    $this->_currentCellIsDirty = true;
    return $cell;
  }

  //	function addCacheData()

  /**
   * Get cell at a specific coordinate
   *
   * @param 	string 			$pCoord		Coordinate of the cell
   * @throws 	PHPExcel_Exception
   * @return 	PHPExcel_Cell 	Cell that was found, or null if not found
   */
  public function getCacheData($pCoord) {
    if ($pCoord === $this->_currentObjectID) {
      return $this->_currentObject;
    }
    $this
      ->_storeData();
    $query = "SELECT value FROM kvp_" . $this->_TableName . " WHERE id='" . $pCoord . "'";
    $cellResultSet = $this->_DBHandle
      ->query($query, SQLITE_ASSOC);
    if ($cellResultSet === false) {
      throw new PHPExcel_Exception(sqlite_error_string($this->_DBHandle
        ->lastError()));
    }
    elseif ($cellResultSet
      ->numRows() == 0) {

      //	Return null if requested entry doesn't exist in cache
      return null;
    }

    //	Set current entry to the requested entry
    $this->_currentObjectID = $pCoord;
    $cellResult = $cellResultSet
      ->fetchSingle();
    $this->_currentObject = unserialize($cellResult);

    //    Re-attach this as the cell's parent
    $this->_currentObject
      ->attach($this);

    //	Return requested entry
    return $this->_currentObject;
  }

  //	function getCacheData()

  /**
   * Is a value set for an indexed cell?
   *
   * @param	string		$pCoord		Coordinate address of the cell to check
   * @return	boolean
   */
  public function isDataSet($pCoord) {
    if ($pCoord === $this->_currentObjectID) {
      return true;
    }

    //	Check if the requested entry exists in the cache
    $query = "SELECT id FROM kvp_" . $this->_TableName . " WHERE id='" . $pCoord . "'";
    $cellResultSet = $this->_DBHandle
      ->query($query, SQLITE_ASSOC);
    if ($cellResultSet === false) {
      throw new PHPExcel_Exception(sqlite_error_string($this->_DBHandle
        ->lastError()));
    }
    elseif ($cellResultSet
      ->numRows() == 0) {

      //	Return null if requested entry doesn't exist in cache
      return false;
    }
    return true;
  }

  //	function isDataSet()

  /**
   * Delete a cell in cache identified by coordinate address
   *
   * @param	string			$pCoord		Coordinate address of the cell to delete
   * @throws	PHPExcel_Exception
   */
  public function deleteCacheData($pCoord) {
    if ($pCoord === $this->_currentObjectID) {
      $this->_currentObject
        ->detach();
      $this->_currentObjectID = $this->_currentObject = null;
    }

    //	Check if the requested entry exists in the cache
    $query = "DELETE FROM kvp_" . $this->_TableName . " WHERE id='" . $pCoord . "'";
    if (!$this->_DBHandle
      ->queryExec($query)) {
      throw new PHPExcel_Exception(sqlite_error_string($this->_DBHandle
        ->lastError()));
    }
    $this->_currentCellIsDirty = false;
  }

  //	function deleteCacheData()

  /**
   * Move a cell object from one address to another
   *
   * @param	string		$fromAddress	Current address of the cell to move
   * @param	string		$toAddress		Destination address of the cell to move
   * @return	boolean
   */
  public function moveCell($fromAddress, $toAddress) {
    if ($fromAddress === $this->_currentObjectID) {
      $this->_currentObjectID = $toAddress;
    }
    $query = "DELETE FROM kvp_" . $this->_TableName . " WHERE id='" . $toAddress . "'";
    $result = $this->_DBHandle
      ->exec($query);
    if ($result === false) {
      throw new PHPExcel_Exception($this->_DBHandle
        ->lastErrorMsg());
    }
    $query = "UPDATE kvp_" . $this->_TableName . " SET id='" . $toAddress . "' WHERE id='" . $fromAddress . "'";
    $result = $this->_DBHandle
      ->exec($query);
    if ($result === false) {
      throw new PHPExcel_Exception($this->_DBHandle
        ->lastErrorMsg());
    }
    return TRUE;
  }

  //	function moveCell()

  /**
   * Get a list of all cell addresses currently held in cache
   *
   * @return	string[]
   */
  public function getCellList() {
    if ($this->_currentObjectID !== null) {
      $this
        ->_storeData();
    }
    $query = "SELECT id FROM kvp_" . $this->_TableName;
    $cellIdsResult = $this->_DBHandle
      ->unbufferedQuery($query, SQLITE_ASSOC);
    if ($cellIdsResult === false) {
      throw new PHPExcel_Exception(sqlite_error_string($this->_DBHandle
        ->lastError()));
    }
    $cellKeys = array();
    foreach ($cellIdsResult as $row) {
      $cellKeys[] = $row['id'];
    }
    return $cellKeys;
  }

  //	function getCellList()

  /**
   * Clone the cell collection
   *
   * @param	PHPExcel_Worksheet	$parent		The new worksheet
   * @return	void
   */
  public function copyCellCollection(PHPExcel_Worksheet $parent) {
    $this->_currentCellIsDirty;
    $this
      ->_storeData();

    //	Get a new id for the new table name
    $tableName = str_replace('.', '_', $this
      ->_getUniqueID());
    if (!$this->_DBHandle
      ->queryExec('CREATE TABLE kvp_' . $tableName . ' (id VARCHAR(12) PRIMARY KEY, value BLOB)
													AS SELECT * FROM kvp_' . $this->_TableName)) {
      throw new PHPExcel_Exception(sqlite_error_string($this->_DBHandle
        ->lastError()));
    }

    //	Copy the existing cell cache file
    $this->_TableName = $tableName;
  }

  //	function copyCellCollection()

  /**
   * Clear the cell collection and disconnect from our parent
   *
   * @return	void
   */
  public function unsetWorksheetCells() {
    if (!is_null($this->_currentObject)) {
      $this->_currentObject
        ->detach();
      $this->_currentObject = $this->_currentObjectID = null;
    }

    //	detach ourself from the worksheet, so that it can then delete this object successfully
    $this->_parent = null;

    //	Close down the temporary cache file
    $this
      ->__destruct();
  }

  //	function unsetWorksheetCells()

  /**
   * Initialise this new cell collection
   *
   * @param	PHPExcel_Worksheet	$parent		The worksheet for this cell collection
   */
  public function __construct(PHPExcel_Worksheet $parent) {
    parent::__construct($parent);
    if (is_null($this->_DBHandle)) {
      $this->_TableName = str_replace('.', '_', $this
        ->_getUniqueID());
      $_DBName = ':memory:';
      $this->_DBHandle = new SQLiteDatabase($_DBName);
      if ($this->_DBHandle === false) {
        throw new PHPExcel_Exception(sqlite_error_string($this->_DBHandle
          ->lastError()));
      }
      if (!$this->_DBHandle
        ->queryExec('CREATE TABLE kvp_' . $this->_TableName . ' (id VARCHAR(12) PRIMARY KEY, value BLOB)')) {
        throw new PHPExcel_Exception(sqlite_error_string($this->_DBHandle
          ->lastError()));
      }
    }
  }

  //	function __construct()

  /**
   * Destroy this cell collection
   */
  public function __destruct() {
    if (!is_null($this->_DBHandle)) {
      $this->_DBHandle
        ->queryExec('DROP TABLE kvp_' . $this->_TableName);
    }
    $this->_DBHandle = null;
  }

  //	function __destruct()

  /**
   * Identify whether the caching method is currently available
   * Some methods are dependent on the availability of certain extensions being enabled in the PHP build
   *
   * @return	boolean
   */
  public static function cacheMethodIsAvailable() {
    if (!function_exists('sqlite_open')) {
      return false;
    }
    return true;
  }

}

Classes

Name	Description
PHPExcel_CachedObjectStorage_SQLite	PHPExcel_CachedObjectStorage_SQLite