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346 lines
11 KiB
346 lines
11 KiB
<?php
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/**
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* PHPExcel_CachedObjectStorage_SQLite3
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*
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* Copyright (c) 2006 - 2015 PHPExcel
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* @category PHPExcel
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* @package PHPExcel_CachedObjectStorage
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* @copyright Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
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* @version ##VERSION##, ##DATE##
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*/
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class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache
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{
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/**
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* Database table name
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*
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* @var string
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*/
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private $TableName = null;
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/**
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* Database handle
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*
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* @var resource
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*/
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private $DBHandle = null;
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/**
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* Prepared statement for a SQLite3 select query
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*
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* @var SQLite3Stmt
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*/
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private $selectQuery;
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/**
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* Prepared statement for a SQLite3 insert query
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*
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* @var SQLite3Stmt
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*/
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private $insertQuery;
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/**
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* Prepared statement for a SQLite3 update query
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*
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* @var SQLite3Stmt
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*/
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private $updateQuery;
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/**
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* Prepared statement for a SQLite3 delete query
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*
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* @var SQLite3Stmt
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*/
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private $deleteQuery;
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/**
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* Store cell data in cache for the current cell object if it's "dirty",
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* and the 'nullify' the current cell object
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*
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* @return void
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* @throws PHPExcel_Exception
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*/
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protected function storeData()
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{
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if ($this->currentCellIsDirty && !empty($this->currentObjectID)) {
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$this->currentObject->detach();
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$this->insertQuery->bindValue('id', $this->currentObjectID, SQLITE3_TEXT);
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$this->insertQuery->bindValue('data', serialize($this->currentObject), SQLITE3_BLOB);
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$result = $this->insertQuery->execute();
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if ($result === false) {
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throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
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}
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$this->currentCellIsDirty = false;
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}
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$this->currentObjectID = $this->currentObject = null;
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}
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/**
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* Add or Update a cell in cache identified by coordinate address
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*
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* @param string $pCoord Coordinate address of the cell to update
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* @param PHPExcel_Cell $cell Cell to update
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* @return PHPExcel_Cell
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* @throws PHPExcel_Exception
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*/
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public function addCacheData($pCoord, PHPExcel_Cell $cell)
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{
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if (($pCoord !== $this->currentObjectID) && ($this->currentObjectID !== null)) {
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$this->storeData();
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}
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$this->currentObjectID = $pCoord;
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$this->currentObject = $cell;
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$this->currentCellIsDirty = true;
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return $cell;
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}
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/**
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* Get cell at a specific coordinate
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*
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* @param string $pCoord Coordinate of the cell
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* @throws PHPExcel_Exception
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* @return PHPExcel_Cell Cell that was found, or null if not found
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*/
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public function getCacheData($pCoord)
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{
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if ($pCoord === $this->currentObjectID) {
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return $this->currentObject;
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}
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$this->storeData();
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$this->selectQuery->bindValue('id', $pCoord, SQLITE3_TEXT);
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$cellResult = $this->selectQuery->execute();
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if ($cellResult === false) {
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throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
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}
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$cellData = $cellResult->fetchArray(SQLITE3_ASSOC);
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if ($cellData === false) {
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// Return null if requested entry doesn't exist in cache
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return null;
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}
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// Set current entry to the requested entry
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$this->currentObjectID = $pCoord;
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$this->currentObject = unserialize($cellData['value']);
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// Re-attach this as the cell's parent
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$this->currentObject->attach($this);
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// Return requested entry
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return $this->currentObject;
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}
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/**
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* Is a value set for an indexed cell?
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*
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* @param string $pCoord Coordinate address of the cell to check
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* @return boolean
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*/
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public function isDataSet($pCoord)
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{
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if ($pCoord === $this->currentObjectID) {
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return true;
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}
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// Check if the requested entry exists in the cache
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$this->selectQuery->bindValue('id', $pCoord, SQLITE3_TEXT);
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$cellResult = $this->selectQuery->execute();
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if ($cellResult === false) {
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throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
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}
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$cellData = $cellResult->fetchArray(SQLITE3_ASSOC);
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return ($cellData === false) ? false : true;
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}
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/**
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* Delete a cell in cache identified by coordinate address
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*
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* @param string $pCoord Coordinate address of the cell to delete
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* @throws PHPExcel_Exception
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*/
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public function deleteCacheData($pCoord)
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{
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if ($pCoord === $this->currentObjectID) {
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$this->currentObject->detach();
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$this->currentObjectID = $this->currentObject = null;
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}
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// Check if the requested entry exists in the cache
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$this->deleteQuery->bindValue('id', $pCoord, SQLITE3_TEXT);
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$result = $this->deleteQuery->execute();
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if ($result === false) {
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throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
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}
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$this->currentCellIsDirty = false;
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}
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/**
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* Move a cell object from one address to another
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*
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* @param string $fromAddress Current address of the cell to move
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* @param string $toAddress Destination address of the cell to move
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* @return boolean
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*/
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public function moveCell($fromAddress, $toAddress)
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{
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if ($fromAddress === $this->currentObjectID) {
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$this->currentObjectID = $toAddress;
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}
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$this->deleteQuery->bindValue('id', $toAddress, SQLITE3_TEXT);
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$result = $this->deleteQuery->execute();
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if ($result === false) {
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throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
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}
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$this->updateQuery->bindValue('toid', $toAddress, SQLITE3_TEXT);
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$this->updateQuery->bindValue('fromid', $fromAddress, SQLITE3_TEXT);
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$result = $this->updateQuery->execute();
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if ($result === false) {
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throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
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}
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return true;
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}
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/**
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* Get a list of all cell addresses currently held in cache
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*
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* @return string[]
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*/
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public function getCellList()
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{
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if ($this->currentObjectID !== null) {
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$this->storeData();
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}
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$query = "SELECT id FROM kvp_".$this->TableName;
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$cellIdsResult = $this->DBHandle->query($query);
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if ($cellIdsResult === false) {
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throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
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}
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$cellKeys = array();
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while ($row = $cellIdsResult->fetchArray(SQLITE3_ASSOC)) {
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$cellKeys[] = $row['id'];
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}
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return $cellKeys;
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}
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/**
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* Clone the cell collection
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*
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* @param PHPExcel_Worksheet $parent The new worksheet
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* @return void
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*/
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public function copyCellCollection(PHPExcel_Worksheet $parent)
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{
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$this->currentCellIsDirty;
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$this->storeData();
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// Get a new id for the new table name
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$tableName = str_replace('.', '_', $this->getUniqueID());
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if (!$this->DBHandle->exec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
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AS SELECT * FROM kvp_'.$this->TableName)
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) {
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throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
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}
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// Copy the existing cell cache file
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$this->TableName = $tableName;
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}
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/**
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* Clear the cell collection and disconnect from our parent
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*
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* @return void
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*/
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public function unsetWorksheetCells()
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{
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if (!is_null($this->currentObject)) {
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$this->currentObject->detach();
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$this->currentObject = $this->currentObjectID = null;
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}
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// detach ourself from the worksheet, so that it can then delete this object successfully
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$this->parent = null;
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// Close down the temporary cache file
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$this->__destruct();
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}
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/**
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* Initialise this new cell collection
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*
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* @param PHPExcel_Worksheet $parent The worksheet for this cell collection
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*/
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public function __construct(PHPExcel_Worksheet $parent)
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{
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parent::__construct($parent);
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if (is_null($this->DBHandle)) {
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$this->TableName = str_replace('.', '_', $this->getUniqueID());
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$_DBName = ':memory:';
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$this->DBHandle = new SQLite3($_DBName);
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if ($this->DBHandle === false) {
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throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
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}
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if (!$this->DBHandle->exec('CREATE TABLE kvp_'.$this->TableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)')) {
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throw new PHPExcel_Exception($this->DBHandle->lastErrorMsg());
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}
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}
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$this->selectQuery = $this->DBHandle->prepare("SELECT value FROM kvp_".$this->TableName." WHERE id = :id");
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$this->insertQuery = $this->DBHandle->prepare("INSERT OR REPLACE INTO kvp_".$this->TableName." VALUES(:id,:data)");
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$this->updateQuery = $this->DBHandle->prepare("UPDATE kvp_".$this->TableName." SET id=:toId WHERE id=:fromId");
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$this->deleteQuery = $this->DBHandle->prepare("DELETE FROM kvp_".$this->TableName." WHERE id = :id");
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}
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/**
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* Destroy this cell collection
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*/
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public function __destruct()
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{
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if (!is_null($this->DBHandle)) {
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$this->DBHandle->exec('DROP TABLE kvp_'.$this->TableName);
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$this->DBHandle->close();
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}
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$this->DBHandle = null;
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}
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/**
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* Identify whether the caching method is currently available
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* Some methods are dependent on the availability of certain extensions being enabled in the PHP build
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*
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* @return boolean
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*/
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public static function cacheMethodIsAvailable()
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{
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if (!class_exists('SQLite3', false)) {
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return false;
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}
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return true;
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}
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}
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