moodle/lib/adodb/drivers/adodb-sqlite3.inc.php

<?php
/**
 * SQLite3 driver
 *
 * @link https://www.sqlite.org/
 *
 * This file is part of ADOdb, a Database Abstraction Layer library for PHP.
 *
 * @package ADOdb
 * @link https://adodb.org Project's web site and documentation
 * @link https://github.com/ADOdb/ADOdb Source code and issue tracker
 *
 * The ADOdb Library is dual-licensed, released under both the BSD 3-Clause
 * and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,
 * any later version. This means you can use it in proprietary products.
 * See the LICENSE.md file distributed with this source code for details.
 * @license BSD-3-Clause
 * @license LGPL-2.1-or-later
 *
 * @copyright 2000-2013 John Lim
 * @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community
 */

// security - hide paths
if (!defined('ADODB_DIR')) die();

/**
 * Class ADODB_sqlite3
 */
class ADODB_sqlite3 extends ADOConnection {
	var $databaseType = "sqlite3";
	var $dataProvider = "sqlite";
	var $replaceQuote = "''"; // string to use to replace quotes
	var $concat_operator='||';
	var $_errorNo = 0;
	var $hasLimit = true;
	var $hasInsertID = true; 		/// supports autoincrement ID?
	var $hasAffectedRows = true; 	/// supports affected rows for update/delete?
	var $metaTablesSQL = "SELECT name FROM sqlite_master WHERE type='table' ORDER BY name";
	var $sysDate = "DATE('now','localtime')";
	var $sysTimeStamp = "DATETIME('now','localtime')";
	var $fmtTimeStamp = "'Y-m-d H:i:s'";

	/** @var SQLite3 */
	var $_connectionID;

	function ServerInfo()
	{
		$version = SQLite3::version();
		$arr['version'] = $version['versionString'];
		$arr['description'] = 'SQLite 3';
		return $arr;
	}

	function BeginTrans()
	{
		if ($this->transOff) {
			return true;
		}
		$this->Execute("BEGIN TRANSACTION");
		$this->transCnt += 1;
		return true;
	}

	function CommitTrans($ok=true)
	{
		if ($this->transOff) {
			return true;
		}
		if (!$ok) {
			return $this->RollbackTrans();
		}
		$ret = $this->Execute("COMMIT");
		if ($this->transCnt > 0) {
			$this->transCnt -= 1;
		}
		return !empty($ret);
	}

	function RollbackTrans()
	{
		if ($this->transOff) {
			return true;
		}
		$ret = $this->Execute("ROLLBACK");
		if ($this->transCnt > 0) {
			$this->transCnt -= 1;
		}
		return !empty($ret);
	}

	function metaType($t,$len=-1,$fieldobj=false)
	{

		if (is_object($t))
		{
			$fieldobj = $t;
			$t = $fieldobj->type;
			$len = $fieldobj->max_length;
		}

		$t = strtoupper($t);

		if (array_key_exists($t,$this->customActualTypes))
			return  $this->customActualTypes[$t];

		/*
		* We are using the Sqlite affinity method here
		* @link https://www.sqlite.org/datatype3.html
		*/
		$affinity = array(
		'INT'=>'INTEGER',
		'INTEGER'=>'INTEGER',
		'TINYINT'=>'INTEGER',
		'SMALLINT'=>'INTEGER',
		'MEDIUMINT'=>'INTEGER',
		'BIGINT'=>'INTEGER',
		'UNSIGNED BIG INT'=>'INTEGER',
		'INT2'=>'INTEGER',
		'INT8'=>'INTEGER',

		'CHARACTER'=>'TEXT',
		'VARCHAR'=>'TEXT',
		'VARYING CHARACTER'=>'TEXT',
		'NCHAR'=>'TEXT',
		'NATIVE CHARACTER'=>'TEXT',
		'NVARCHAR'=>'TEXT',
		'TEXT'=>'TEXT',
		'CLOB'=>'TEXT',

		'BLOB'=>'BLOB',

		'REAL'=>'REAL',
		'DOUBLE'=>'REAL',
		'DOUBLE PRECISION'=>'REAL',
		'FLOAT'=>'REAL',

		'NUMERIC'=>'NUMERIC',
		'DECIMAL'=>'NUMERIC',
		'BOOLEAN'=>'NUMERIC',
		'DATE'=>'NUMERIC',
		'DATETIME'=>'NUMERIC'
		);

		if (!isset($affinity[$t]))
			return ADODB_DEFAULT_METATYPE;

		$subt = $affinity[$t];
		/*
		* Now that we have subclassed the provided data down
		* the sqlite 'affinity', we convert to ADOdb metatype
		*/

		$subclass = array('INTEGER'=>'I',
						  'TEXT'=>'X',
						  'BLOB'=>'B',
						  'REAL'=>'N',
						  'NUMERIC'=>'N');

		return $subclass[$subt];
	}
	// mark newnham
	function MetaColumns($table, $normalize=true)
	{
		global $ADODB_FETCH_MODE;
		$false = false;
		$save = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
		if ($this->fetchMode !== false) {
			$savem = $this->SetFetchMode(false);
		}
		$rs = $this->Execute("PRAGMA table_info('$table')");
		if (isset($savem)) {
			$this->SetFetchMode($savem);
		}
		if (!$rs) {
			$ADODB_FETCH_MODE = $save;
			return $false;
		}
		$arr = array();
		while ($r = $rs->FetchRow()) {
			$type = explode('(',$r['type']);
			$size = '';
			if (sizeof($type)==2) {
				$size = trim($type[1],')');
			}
			$fn = strtoupper($r['name']);
			$fld = new ADOFieldObject;
			$fld->name = $r['name'];
			$fld->type = $type[0];
			$fld->max_length = $size;
			$fld->not_null = $r['notnull'];
			$fld->default_value = $r['dflt_value'];
			$fld->scale = 0;
			if (isset($r['pk']) && $r['pk']) {
				$fld->primary_key=1;
			}
			if ($save == ADODB_FETCH_NUM) {
				$arr[] = $fld;
			} else {
				$arr[strtoupper($fld->name)] = $fld;
			}
		}
		$rs->Close();
		$ADODB_FETCH_MODE = $save;
		return $arr;
	}

	public function metaForeignKeys($table, $owner = '', $upper =  false, $associative =  false)
	{
	    global $ADODB_FETCH_MODE;
		if ($ADODB_FETCH_MODE == ADODB_FETCH_ASSOC
		|| $this->fetchMode == ADODB_FETCH_ASSOC)
		$associative = true;

	    /*
		* Read sqlite master to find foreign keys
		*/
		$sql = "SELECT sql
				 FROM (
				SELECT sql sql, type type, tbl_name tbl_name, name name
				  FROM sqlite_master
			          )
				WHERE type != 'meta'
				  AND sql NOTNULL
				  AND LOWER(name) ='" . strtolower($table) . "'";

		$tableSql = $this->getOne($sql);

		$fkeyList = array();
		$ylist = preg_split("/,+/",$tableSql);
		foreach ($ylist as $y)
		{
			if (!preg_match('/FOREIGN/',$y))
				continue;

			$matches = false;
			preg_match_all('/\((.+?)\)/i',$y,$matches);
			$tmatches = false;
			preg_match_all('/REFERENCES (.+?)\(/i',$y,$tmatches);

			if ($associative)
			{
				if (!isset($fkeyList[$tmatches[1][0]]))
					$fkeyList[$tmatches[1][0]]	= array();
				$fkeyList[$tmatches[1][0]][$matches[1][0]] = $matches[1][1];
			}
			else
				$fkeyList[$tmatches[1][0]][] = $matches[1][0] . '=' . $matches[1][1];
		}

		if ($associative)
		{
			if ($upper)
				$fkeyList = array_change_key_case($fkeyList,CASE_UPPER);
			else
				$fkeyList = array_change_key_case($fkeyList,CASE_LOWER);
		}
		return $fkeyList;
	}


	function _init($parentDriver)
	{
		$parentDriver->hasTransactions = false;
		$parentDriver->hasInsertID = true;
	}

	protected function _insertID($table = '', $column = '')
	{
		return $this->_connectionID->lastInsertRowID();
	}

	function _affectedrows()
	{
		return $this->_connectionID->changes();
	}

	function ErrorMsg()
 	{
		if ($this->_logsql) {
			return $this->_errorMsg;
		}
		return ($this->_errorNo) ? $this->ErrorNo() : ''; //**tochange?
	}

	function ErrorNo()
	{
		return $this->_connectionID->lastErrorCode(); //**tochange??
	}

	function SQLDate($fmt, $col=false)
	{
		/*
		* In order to map the values correctly, we must ensure the proper
		* casing for certain fields
		* Y must be UC, because y is a 2 digit year
		* d must be LC, because D is 3 char day
		* A must be UC  because a is non-portable am
		* Q must be UC  because q means nothing
		*/
		$fromChars = array('y','D','a','q');
		$toChars   = array('Y','d','A','Q');
		$fmt       = str_replace($fromChars,$toChars,$fmt);

		$fmt = $this->qstr($fmt);
		return ($col) ? "adodb_date2($fmt,$col)" : "adodb_date($fmt)";
	}

	function _createFunctions()
	{
		$this->_connectionID->createFunction('adodb_date', 'adodb_date', 1);
		$this->_connectionID->createFunction('adodb_date2', 'adodb_date2', 2);
	}

	/** @noinspection PhpUnusedParameterInspection */
	function _connect($argHostname, $argUsername, $argPassword, $argDatabasename)
	{
		if (empty($argHostname) && $argDatabasename) {
			$argHostname = $argDatabasename;
		}
		$this->_connectionID = new SQLite3($argHostname);
		$this->_createFunctions();

		return true;
	}

	function _pconnect($argHostname, $argUsername, $argPassword, $argDatabasename)
	{
		// There's no permanent connect in SQLite3
		return $this->_connect($argHostname, $argUsername, $argPassword, $argDatabasename);
	}

	// returns query ID if successful, otherwise false
	function _query($sql,$inputarr=false)
	{
		$rez = $this->_connectionID->query($sql);
		if ($rez === false) {
			$this->_errorNo = $this->_connectionID->lastErrorCode();
		}
		// If no data was returned, we don't need to create a real recordset
		elseif ($rez->numColumns() == 0) {
			$rez->finalize();
			$rez = true;
		}

		return $rez;
	}

	function SelectLimit($sql,$nrows=-1,$offset=-1,$inputarr=false,$secs2cache=0)
	{
		$nrows = (int) $nrows;
		$offset = (int) $offset;
		$offsetStr = ($offset >= 0) ? " OFFSET $offset" : '';
		$limitStr  = ($nrows >= 0)  ? " LIMIT $nrows" : ($offset >= 0 ? ' LIMIT 999999999' : '');
		if ($secs2cache) {
			$rs = $this->CacheExecute($secs2cache,$sql."$limitStr$offsetStr",$inputarr);
		} else {
			$rs = $this->Execute($sql."$limitStr$offsetStr",$inputarr);
		}

		return $rs;
	}

	/*
		This algorithm is not very efficient, but works even if table locking
		is not available.

		Will return false if unable to generate an ID after $MAXLOOPS attempts.
	*/
	var $_genSeqSQL = "create table %s (id integer)";

	function GenID($seq='adodbseq',$start=1)
	{
		// if you have to modify the parameter below, your database is overloaded,
		// or you need to implement generation of id's yourself!
		$MAXLOOPS = 100;
		//$this->debug=1;
		while (--$MAXLOOPS>=0) {
			@($num = $this->GetOne("select id from $seq"));
			if ($num === false) {
				$this->Execute(sprintf($this->_genSeqSQL ,$seq));
				$start -= 1;
				$num = '0';
				$ok = $this->Execute("insert into $seq values($start)");
				if (!$ok) {
					return false;
				}
			}
			$this->Execute("update $seq set id=id+1 where id=$num");

			if ($this->affected_rows() > 0) {
				$num += 1;
				$this->genID = $num;
				return $num;
			}
		}
		if ($fn = $this->raiseErrorFn) {
			$fn($this->databaseType,'GENID',-32000,"Unable to generate unique id after $MAXLOOPS attempts",$seq,$num);
		}
		return false;
	}

	function createSequence($seqname='adodbseq', $startID=1)
	{
		if (empty($this->_genSeqSQL)) {
			return false;
		}
		$ok = $this->Execute(sprintf($this->_genSeqSQL,$seqname));
		if (!$ok) {
			return false;
		}
		$startID -= 1;
		return $this->Execute("insert into $seqname values($startID)");
	}

	var $_dropSeqSQL = 'drop table %s';
	function DropSequence($seqname = 'adodbseq')
	{
		if (empty($this->_dropSeqSQL)) {
			return false;
		}
		return $this->Execute(sprintf($this->_dropSeqSQL,$seqname));
	}

	// returns true or false
	function _close()
	{
		return $this->_connectionID->close();
	}

	function metaIndexes($table, $primary = FALSE, $owner = false)
	{
		$false = false;
		// save old fetch mode
		global $ADODB_FETCH_MODE;
		$save = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
		if ($this->fetchMode !== FALSE) {
			$savem = $this->SetFetchMode(FALSE);
		}

		$pragmaData = array();

		/*
		* If we want the primary key, we must extract
		* it from the table statement, and the pragma
		*/
		if ($primary)
		{
			$sql = sprintf('PRAGMA table_info([%s]);',
						   strtolower($table)
						   );
			$pragmaData = $this->getAll($sql);
		}

		/*
		* Exclude the empty entry for the primary index
		*/
		$sqlite = "SELECT name,sql
					 FROM sqlite_master
					WHERE type='index'
					  AND sql IS NOT NULL
					  AND LOWER(tbl_name)='%s'";

		$SQL = sprintf($sqlite,
				     strtolower($table)
					 );

		$rs = $this->execute($SQL);

		if (!is_object($rs)) {
			if (isset($savem)) {
				$this->SetFetchMode($savem);
			}
			$ADODB_FETCH_MODE = $save;
			return $false;
		}

		$indexes = array ();

		while ($row = $rs->FetchRow())
		{

			if (!isset($indexes[$row[0]])) {
				$indexes[$row[0]] = array(
					'unique' => preg_match("/unique/i",$row[1]),
					'columns' => array()
				);
			}
			/**
			 * The index elements appear in the SQL statement
			 * in cols[1] between parentheses
			 * e.g CREATE UNIQUE INDEX ware_0 ON warehouse (org,warehouse)
			 */
			preg_match_all('/\((.*)\)/',$row[1],$indexExpression);
			$indexes[$row[0]]['columns'] = array_map('trim',explode(',',$indexExpression[1][0]));
		}

		if (isset($savem)) {
			$this->SetFetchMode($savem);
			$ADODB_FETCH_MODE = $save;
		}

		/*
		* If we want primary, add it here
		*/
		if ($primary){

			/*
			* Check the previously retrieved pragma to search
			* with a closure
			*/

			$pkIndexData = array('unique'=>1,'columns'=>array());

			$pkCallBack = function ($value, $key) use (&$pkIndexData) {

				/*
				* As we iterate the elements check for pk index and sort
				*/
				if ($value[5] > 0)
				{
					$pkIndexData['columns'][$value[5]] = strtolower($value[1]);
					ksort($pkIndexData['columns']);
				}
			};

			array_walk($pragmaData,$pkCallBack);

			/*
			* If we found no columns, there is no
			* primary index
			*/
			if (count($pkIndexData['columns']) > 0)
				$indexes['PRIMARY'] = $pkIndexData;
		}

		return $indexes;
	}

	/**
	* Returns the maximum size of a MetaType C field. Because of the
	* database design, sqlite places no limits on the size of data inserted
	*
	* @return int
	*/
	function charMax()
	{
		return ADODB_STRINGMAX_NOLIMIT;
	}

	/**
	* Returns the maximum size of a MetaType X field. Because of the
	* database design, sqlite places no limits on the size of data inserted
	*
	* @return int
	*/
	function textMax()
	{
		return ADODB_STRINGMAX_NOLIMIT;
	}

	/**
	 * Converts a date to a month only field and pads it to 2 characters
	 *
	 * This uses the more efficient strftime native function to process
	 *
	 * @param string $fld	The name of the field to process
	 *
	 * @return string The SQL Statement
	 */
	function month($fld)
	{
		return "strftime('%m',$fld)";
	}

	/**
	 * Converts a date to a day only field and pads it to 2 characters
	 *
	 * This uses the more efficient strftime native function to process
	 *
	 * @param string $fld	The name of the field to process
	 *
	 * @return string The SQL Statement
	 */
	function day($fld) {
		return "strftime('%d',$fld)";
	}

	/**
	 * Converts a date to a year only field
	 *
	 * This uses the more efficient strftime native function to process
	 *
	 * @param string $fld	The name of the field to process
	 *
	 * @return string The SQL Statement
	 */
	function year($fld)
	{
		return "strftime('%Y',$fld)";
	}

	/**
	 * SQLite update for blob
	 *
	 * SQLite must be a fully prepared statement (all variables must be bound),
	 * so $where can either be an array (array params) or a string that we will
	 * do our best to unpack and turn into a prepared statement.
	 *
	 * @param string $table
	 * @param string $column
	 * @param string $val      Blob value to set
	 * @param mixed  $where    An array of parameters (key => value pairs),
	 *                         or a string (where clause).
	 * @param string $blobtype ignored
	 *
	 * @return bool success
	 */
	function updateBlob($table, $column, $val, $where, $blobtype = 'BLOB')
	{
		if (is_array($where)) {
			// We were passed a set of key=>value pairs
			$params = $where;
		} else {
			// Given a where clause string, we have to disassemble the
			// statements into keys and values
			$params = array();
			$temp = preg_split('/(where|and)/i', $where);
			$where = array_filter($temp);

			foreach ($where as $wValue) {
				$wTemp = preg_split('/[= \']+/', $wValue);
				$wTemp = array_filter($wTemp);
				$wTemp = array_values($wTemp);
				$params[$wTemp[0]] = $wTemp[1];
			}
		}

		$paramWhere = array();
		foreach ($params as $bindKey => $bindValue) {
			$paramWhere[] = $bindKey . '=?';
		}

		$sql = "UPDATE $table SET $column=? WHERE "
			. implode(' AND ', $paramWhere);

		// Prepare the statement
		$stmt = $this->_connectionID->prepare($sql);

		// Set the first bind value equal to value we want to update
		if (!$stmt->bindValue(1, $val, SQLITE3_BLOB)) {
			return false;
		}

		// Build as many keys as available
		$bindIndex = 2;
		foreach ($params as $bindValue) {
			if (is_integer($bindValue) || is_bool($bindValue) || is_float($bindValue)) {
				$type = SQLITE3_NUM;
			} elseif (is_object($bindValue)) {
				// Assume a blob, this should never appear in
				// the binding for a where statement anyway
				$type = SQLITE3_BLOB;
			} else {
				$type = SQLITE3_TEXT;
			}

			if (!$stmt->bindValue($bindIndex, $bindValue, $type)) {
				return false;
			}

			$bindIndex++;
		}

		// Now execute the update. NB this is SQLite execute, not ADOdb
		$ok = $stmt->execute();
		return is_object($ok);
	}

	/**
	 * SQLite update for blob from a file
	 *
	 * @param string $table
	 * @param string $column
	 * @param string $path      Filename containing blob data
	 * @param mixed  $where    {@see updateBlob()}
	 * @param string $blobtype ignored
	 *
	 * @return bool success
	 */
	function updateBlobFile($table, $column, $path, $where, $blobtype = 'BLOB')
	{
		if (!file_exists($path)) {
			return false;
		}

		// Read file information
		$fileContents = file_get_contents($path);
		if ($fileContents === false)
			// Distinguish between an empty file and failure
			return false;

		return $this->updateBlob($table, $column, $fileContents, $where, $blobtype);
	}

}

/*--------------------------------------------------------------------------------------
		Class Name: Recordset
--------------------------------------------------------------------------------------*/

class ADORecordset_sqlite3 extends ADORecordSet {

	var $databaseType = "sqlite3";
	var $bind = false;

	/** @var SQLite3Result */
	var $_queryID;

	/** @noinspection PhpMissingParentConstructorInspection */
	function __construct($queryID,$mode=false)
	{
		if ($mode === false) {
			global $ADODB_FETCH_MODE;
			$mode = $ADODB_FETCH_MODE;
		}
		switch($mode) {
			case ADODB_FETCH_NUM:
				$this->fetchMode = SQLITE3_NUM;
				break;
			case ADODB_FETCH_ASSOC:
				$this->fetchMode = SQLITE3_ASSOC;
				break;
			default:
				$this->fetchMode = SQLITE3_BOTH;
				break;
		}
		$this->adodbFetchMode = $mode;

		$this->_queryID = $queryID;

		$this->_inited = true;
		$this->fields = array();
		if ($queryID) {
			$this->_currentRow = 0;
			$this->EOF = !$this->_fetch();
			@$this->_initrs();
		} else {
			$this->_numOfRows = 0;
			$this->_numOfFields = 0;
			$this->EOF = true;
		}

		return $this->_queryID;
	}


	function FetchField($fieldOffset = -1)
	{
		$fld = new ADOFieldObject;
		$fld->name = $this->_queryID->columnName($fieldOffset);
		$fld->type = 'VARCHAR';
		$fld->max_length = -1;
		return $fld;
	}

	function _initrs()
	{
		$this->_numOfFields = $this->_queryID->numColumns();

	}

	function Fields($colname)
	{
		if ($this->fetchMode != SQLITE3_NUM) {
			return $this->fields[$colname];
		}
		if (!$this->bind) {
			$this->bind = array();
			for ($i=0; $i < $this->_numOfFields; $i++) {
				$o = $this->FetchField($i);
				$this->bind[strtoupper($o->name)] = $i;
			}
		}

		return $this->fields[$this->bind[strtoupper($colname)]];
	}

	function _seek($row)
	{
		// sqlite3 does not implement seek
		if ($this->debug) {
			ADOConnection::outp("SQLite3 does not implement seek");
		}
		return false;
	}

	function _fetch($ignore_fields=false)
	{
		$this->fields = $this->_queryID->fetchArray($this->fetchMode);
		return !empty($this->fields);
	}

	function _close()
	{
	}

}