SQLite3.php

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<?php
class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
 
        private $_TableName = null;
 
        private $_DBHandle = null;
 
        private $_selectQuery;
 
        private $_insertQuery;
 
        private $_updateQuery;
 
        private $_deleteQuery;
 
        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;
        }       //      function _storeData()
 
 
        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()
 
 
        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;
        }       //      function getCacheData()
 
 
        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;
        }       //      function isDataSet()
 
 
        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;
        }       //      function deleteCacheData()
 
 
        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;
        }       //      function moveCell()
 
 
        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;
        }       //      function getCellList()
 
 
        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;
        }       //      function copyCellCollection()
 
 
        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()
 
 
        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");
        }       //      function __construct()
 
 
        public function __destruct() {
                if (!is_null($this->_DBHandle)) {
                        $this->_DBHandle->exec('DROP TABLE kvp_'.$this->_TableName);
                        $this->_DBHandle->close();
                }
                $this->_DBHandle = null;
        }       //      function __destruct()
 
 
        public static function cacheMethodIsAvailable() {
                if (!class_exists('SQLite3',FALSE)) {
                        return false;
                }
 
                return true;
        }
 
}