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<?php
/**
* PHPExcel_CachedObjectStorage_SQLite3
*
* Copyright (c) 2006 - 2015 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 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
* @version ##VERSION##, ##DATE##
*/
class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache
{
/**
* Database table name
*
* @var string
*/
private $TableName = null;
/**
* Database handle
*
* @var resource
*/
private $DBHandle = null;
/**
* Prepared statement for a SQLite3 select query
*
* @var SQLite3Stmt
*/
private $selectQuery;
/**
* Prepared statement for a SQLite3 insert query
*
* @var SQLite3Stmt
*/
private $insertQuery;
/**
* Prepared statement for a SQLite3 update query
*
* @var SQLite3Stmt
*/
private $updateQuery;
/**
* Prepared statement for a SQLite3 delete query
*
* @var SQLite3Stmt
*/
private $deleteQuery;
/**
* Store cell data in cache for the current cell object if it's "dirty",
* and the 'nullify' the current cell object
*
* @return void
* @throws PHPExcel_Exception
*/
protected function storeData()
{
if ($this->currentCellIsDirty && !empty($this->currentObjectID)) {
$this->currentObject->detach();
$this->insertQuery->bindValue('id', $this->currentObjectID, SQLITE3_TEXT);
$this->insertQuery->bindValue('data', serialize($this->currentObject), SQLITE3_BLOB);
$result = $this->insertQuery->execute();
if ($result === false) {
throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
}
$this->currentCellIsDirty = false;
}
$this->currentObjectID = $this->currentObject = null;
}
/**
* 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;
}
/**
* 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();
$this->selectQuery->bindValue('id', $pCoord, SQLITE3_TEXT);
$cellResult = $this->selectQuery->execute();
if ($cellResult === false) {
throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
}
$cellData = $cellResult->fetchArray(SQLITE3_ASSOC);
if ($cellData === false) {
// Return null if requested entry doesn't exist in cache
return null;
}
// Set current entry to the requested entry
$this->currentObjectID = $pCoord;
$this->currentObject = unserialize($cellData['value']);
// Re-attach this as the cell's parent
$this->currentObject->attach($this);
// Return requested entry
return $this->currentObject;
}
/**
* 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
$this->selectQuery->bindValue('id', $pCoord, SQLITE3_TEXT);
$cellResult = $this->selectQuery->execute();
if ($cellResult === false) {
throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
}
$cellData = $cellResult->fetchArray(SQLITE3_ASSOC);
return ($cellData === false) ? false : true;
}
/**
* 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
$this->deleteQuery->bindValue('id', $pCoord, SQLITE3_TEXT);
$result = $this->deleteQuery->execute();
if ($result === false) {
throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
}
$this->currentCellIsDirty = false;
}
/**
* 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;
}
$this->deleteQuery->bindValue('id', $toAddress, SQLITE3_TEXT);
$result = $this->deleteQuery->execute();
if ($result === false) {
throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
}
$this->updateQuery->bindValue('toid', $toAddress, SQLITE3_TEXT);
$this->updateQuery->bindValue('fromid', $fromAddress, SQLITE3_TEXT);
$result = $this->updateQuery->execute();
if ($result === false) {
throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
}
return true;
}
/**
* Get a list of all cell addresses currently held in cache
*
* @return string[]
*/
public function getCellList()
{
if ($this->currentObjectID !== null) {
$this->storeData();
}
$query = "SELECT id FROM kvp_".$this->TableName;
$cellIdsResult = $this->DBHandle->query($query);
if ($cellIdsResult === false) {
throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
}
$cellKeys = array();
while ($row = $cellIdsResult->fetchArray(SQLITE3_ASSOC)) {
$cellKeys[] = $row['id'];
}
return $cellKeys;
}
/**
* 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->exec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
AS SELECT * FROM kvp_'.$this->TableName)
) {
throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
}
// Copy the existing cell cache file
$this->TableName = $tableName;
}
/**
* Clear the cell collection and disconnect from our parent
*
* @return void
*/
public function unsetWorksheetCells()
{
if (!is_null($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();
}
/**
* 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:';
$this->DBHandle = new SQLite3($_DBName);
if ($this->DBHandle === false) {
throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
}
if (!$this->DBHandle->exec('CREATE TABLE kvp_'.$this->TableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)')) {
throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
}
}
$this->selectQuery = $this->DBHandle->prepare("SELECT value FROM kvp_".$this->TableName." WHERE id = :id");
$this->insertQuery = $this->DBHandle->prepare("INSERT OR REPLACE INTO kvp_".$this->TableName." VALUES(:id,:data)");
$this->updateQuery = $this->DBHandle->prepare("UPDATE kvp_".$this->TableName." SET id=:toId WHERE id=:fromId");
$this->deleteQuery = $this->DBHandle->prepare("DELETE FROM kvp_".$this->TableName." WHERE id = :id");
}
/**
* Destroy this cell collection
*/
public function __destruct()
{
if (!is_null($this->DBHandle)) {
$this->DBHandle->exec('DROP TABLE kvp_'.$this->TableName);
$this->DBHandle->close();
}
$this->DBHandle = null;
}
/**
* 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 (!class_exists('SQLite3', false)) {
return false;
}
return true;
}
}
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