PDO refactoring for code simplification (#2522)

* PDO refactor

* Automatic prefix when using the syntax `_tableName`
* Uniformity: MySQL is now PDO::ATTR_EMULATE_PREPARES = false just like SQLite and PostgreSQL, with consequences such as only one statement per query
* Use PDO methods exec(), query(), prepare() + execute() in a more efficient way
* Remove auto-update SQL code for versions older than FreshRSS 1.5 (3 years old)
* The name of the default category is set in PHP instead of in the DB (simplies SQL and allows changing the name according to the FreshRSS language)
* Rename `->bd` to `->pdo` (less of a frenshism, and more informative)
* Fix some requests, which were not compatible with MySQL prepared statements

* Whitespace

* Fix syntax for PostgreSQL sequences

+ MySQL install

* Minor formatting

* Fix lastInsertId for PostgreSQL

* Use PHP 5.6+ const

Take advantage of https://github.com/FreshRSS/FreshRSS/pull/2527
https://www.php.net/manual/en/migration56.new-features.php

* A bit of forgotten PHP 5.6 simplification for cURL

* Forgotten $s

* Mini fix custom user config

https://github.com/FreshRSS/FreshRSS/pull/2490/files#r326290346

* More work on install.php but not finished

* install.php working

* More cleaning of PDO in install

* Even more simplification

Take advantage of PDO->exec() to run multiple statements

* Disallow changing the name of the default category

https://github.com/FreshRSS/FreshRSS/pull/2522#discussion_r326967724

1 files changed, 122 insertions, 219 deletions

diff --git a/app/Models/EntryDAO.php b/app/Models/EntryDAO.php
index b13c83d67..fbf160041 100644
--- a/app/Models/EntryDAO.php
+++ b/app/Models/EntryDAO.php
@@ -19,105 +19,21 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 	}
 
 	//TODO: Move the database auto-updates to DatabaseDAO
-	protected function addColumn($name) {
-		Minz_Log::warning('FreshRSS_EntryDAO::addColumn: ' . $name);
-		$hasTransaction = false;
-		try {
-			$stm = null;
-			if ($name === 'lastSeen') {	//v1.1.1
-				if (!$this->bd->inTransaction()) {
-					$this->bd->beginTransaction();
-					$hasTransaction = true;
-				}
-				$stm = $this->bd->prepare('ALTER TABLE `' . $this->prefix . 'entry` ADD COLUMN `lastSeen` INT(11) DEFAULT 0');
-				if ($stm && $stm->execute()) {
-					$stm = $this->bd->prepare('CREATE INDEX entry_lastSeen_index ON `' . $this->prefix . 'entry`(`lastSeen`);');	//"IF NOT EXISTS" does not exist in MySQL 5.7
-					if ($stm && $stm->execute()) {
-						if ($hasTransaction) {
-							$this->bd->commit();
-						}
-						return true;
-					}
-				}
-				if ($hasTransaction) {
-					$this->bd->rollBack();
-				}
-			} elseif ($name === 'hash') {	//v1.1.1
-				$stm = $this->bd->prepare('ALTER TABLE `' . $this->prefix . 'entry` ADD COLUMN hash BINARY(16)');
-				return $stm && $stm->execute();
-			}
-		} catch (Exception $e) {
-			Minz_Log::error('FreshRSS_EntryDAO::addColumn error: ' . $e->getMessage());
-			if ($hasTransaction) {
-				$this->bd->rollBack();
-			}
-		}
-		return false;
-	}
-
-	private $triedUpdateToUtf8mb4 = false;
-
-	//TODO: Move the database auto-updates to DatabaseDAO
-	protected function updateToUtf8mb4() {
-		if ($this->triedUpdateToUtf8mb4) {
-			return false;
-		}
-		$this->triedUpdateToUtf8mb4 = true;
-		$db = FreshRSS_Context::$system_conf->db;
-		if ($this->bd->dbType() === 'mysql') {
-			include_once(APP_PATH . '/SQL/install.sql.mysql.php');
-			if (defined('SQL_UPDATE_UTF8MB4')) {
-				Minz_Log::warning('Updating MySQL to UTF8MB4...');	//v1.5.0
-				$hadTransaction = $this->bd->inTransaction();
-				if ($hadTransaction) {
-					$this->bd->commit();
-				}
-				$ok = false;
-				try {
-					$sql = sprintf(SQL_UPDATE_UTF8MB4, $this->prefix, $db['base']);
-					$stm = $this->bd->prepare($sql);
-					$ok = $stm->execute();
-				} catch (Exception $e) {
-					Minz_Log::error('FreshRSS_EntryDAO::updateToUtf8mb4 error: ' . $e->getMessage());
-				}
-				if ($hadTransaction) {
-					$this->bd->beginTransaction();
-					//NB: Transaction not starting. Why? (tested on PHP 7.0.8-0ubuntu and MySQL 5.7.13-0ubuntu)
-				}
-				return $ok;
-			}
-		}
-		return false;
-	}
-
-	//TODO: Move the database auto-updates to DatabaseDAO
 	protected function createEntryTempTable() {
 		$ok = false;
-		$hadTransaction = $this->bd->inTransaction();
+		$hadTransaction = $this->pdo->inTransaction();
 		if ($hadTransaction) {
-			$this->bd->commit();
+			$this->pdo->commit();
 		}
 		try {
-			require_once(APP_PATH . '/SQL/install.sql.' . $this->bd->dbType() . '.php');
+			require_once(APP_PATH . '/SQL/install.sql.' . $this->pdo->dbType() . '.php');
 			Minz_Log::warning('SQL CREATE TABLE entrytmp...');
-			if (defined('SQL_CREATE_TABLE_ENTRYTMP')) {
-				$sql = sprintf(SQL_CREATE_TABLE_ENTRYTMP, $this->prefix);
-				$stm = $this->bd->prepare($sql);
-				$ok = $stm && $stm->execute();
-			} else {
-				global $SQL_CREATE_TABLE_ENTRYTMP;
-				$ok = !empty($SQL_CREATE_TABLE_ENTRYTMP);
-				foreach ($SQL_CREATE_TABLE_ENTRYTMP as $instruction) {
-					$sql = sprintf($instruction, $this->prefix);
-					$stm = $this->bd->prepare($sql);
-					$ok &= $stm && $stm->execute();
-				}
-			}
+			$ok = $this->pdo->exec(SQL_CREATE_TABLE_ENTRYTMP) !== false;
 		} catch (Exception $e) {
 			Minz_Log::error('FreshRSS_EntryDAO::createEntryTempTable error: ' . $e->getMessage());
 		}
 		if ($hadTransaction) {
-			$this->bd->beginTransaction();
+			$this->pdo->beginTransaction();
 		}
 		return $ok;
 	}
@@ -125,14 +41,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 	//TODO: Move the database auto-updates to DatabaseDAO
 	protected function autoUpdateDb($errorInfo) {
 		if (isset($errorInfo[0])) {
-			if ($errorInfo[0] === FreshRSS_DatabaseDAO::ER_BAD_FIELD_ERROR) {
-				//autoAddColumn
-				foreach (array('lastSeen', 'hash') as $column) {
-					if (stripos($errorInfo[2], $column) !== false) {
-						return $this->addColumn($column);
-					}
-				}
-			} elseif ($errorInfo[0] === FreshRSS_DatabaseDAO::ER_BAD_TABLE_ERROR) {
+			if ($errorInfo[0] === FreshRSS_DatabaseDAO::ER_BAD_TABLE_ERROR) {
 				if (stripos($errorInfo[2], 'tag') !== false) {
 					$tagDAO = FreshRSS_Factory::createTagDao();
 					return $tagDAO->createTagTable();	//v1.12.0
@@ -141,11 +50,6 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 				}
 			}
 		}
-		if (isset($errorInfo[1])) {
-			if ($errorInfo[1] == FreshRSS_DatabaseDAO::ER_TRUNCATED_WRONG_VALUE_FOR_FIELD) {
-				return $this->updateToUtf8mb4();	//v1.5.0
-			}
-		}
 		return false;
 	}
 
@@ -153,7 +57,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 
 	public function addEntry($valuesTmp, $useTmpTable = true) {
 		if ($this->addEntryPrepared == null) {
-			$sql = 'INSERT INTO `' . $this->prefix . ($useTmpTable ? 'entrytmp' : 'entry') . '` (id, guid, title, author, '
+			$sql = 'INSERT INTO `_' . ($useTmpTable ? 'entrytmp' : 'entry') . '` (id, guid, title, author, '
 				. ($this->isCompressed() ? 'content_bin' : 'content')
 				. ', link, date, `lastSeen`, hash, is_read, is_favorite, id_feed, tags) '
 				. 'VALUES(:id, :guid, :title, :author, '
@@ -161,7 +65,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 				. ', :link, :date, :last_seen, '
 				. $this->sqlHexDecode(':hash')
 				. ', :is_read, :is_favorite, :id_feed, :tags)';
-			$this->addEntryPrepared = $this->bd->prepare($sql);
+			$this->addEntryPrepared = $this->pdo->prepare($sql);
 		}
 		if ($this->addEntryPrepared) {
 			$this->addEntryPrepared->bindParam(':id', $valuesTmp['id']);
@@ -212,22 +116,26 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 	}
 
 	public function commitNewEntries() {
-		$sql = 'SET @rank=(SELECT MAX(id) - COUNT(*) FROM `' . $this->prefix . 'entrytmp`); ' .	//MySQL-specific
-			'INSERT IGNORE INTO `' . $this->prefix . 'entry`
-				(
-					id, guid, title, author, content_bin, link, date, `lastSeen`, hash, is_read, is_favorite, id_feed, tags
-				) ' .
-				'SELECT @rank:=@rank+1 AS id, guid, title, author, content_bin, link, date, `lastSeen`, hash, is_read, is_favorite, id_feed, tags
-					FROM `' . $this->prefix . 'entrytmp`
-					ORDER BY date; ' .
-			'DELETE FROM `' . $this->prefix . 'entrytmp` WHERE id <= @rank;';
-		$hadTransaction = $this->bd->inTransaction();
+		$sql = <<<'SQL'
+SET @rank=(SELECT MAX(id) - COUNT(*) FROM `_entrytmp`);
+
+INSERT IGNORE INTO `_entry` (
+	id, guid, title, author, content_bin, link, date, `lastSeen`,
+	hash, is_read, is_favorite, id_feed, tags
+)
+SELECT @rank:=@rank+1 AS id, guid, title, author, content_bin, link, date, `lastSeen`, hash, is_read, is_favorite, id_feed, tags
+FROM `_entrytmp`
+ORDER BY date;
+
+DELETE FROM `_entrytmp` WHERE id <= @rank;';
+SQL;
+		$hadTransaction = $this->pdo->inTransaction();
 		if (!$hadTransaction) {
-			$this->bd->beginTransaction();
+			$this->pdo->beginTransaction();
 		}
-		$result = $this->bd->exec($sql) !== false;
+		$result = $this->pdo->exec($sql) !== false;
 		if (!$hadTransaction) {
-			$this->bd->commit();
+			$this->pdo->commit();
 		}
 		return $result;
 	}
@@ -240,7 +148,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 		}
 
 		if ($this->updateEntryPrepared === null) {
-			$sql = 'UPDATE `' . $this->prefix . 'entry` '
+			$sql = 'UPDATE `_entry` '
 				. 'SET title=:title, author=:author, '
 				. ($this->isCompressed() ? 'content_bin=COMPRESS(:content)' : 'content=:content')
 				. ', link=:link, date=:date, `lastSeen`=:last_seen, '
@@ -248,7 +156,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 				. ', ' . ($valuesTmp['is_read'] === null ? '' : 'is_read=:is_read, ')
 				. 'tags=:tags '
 				. 'WHERE id_feed=:id_feed AND guid=:guid';
-			$this->updateEntryPrepared = $this->bd->prepare($sql);
+			$this->updateEntryPrepared = $this->pdo->prepare($sql);
 		}
 
 		$valuesTmp['guid'] = substr($valuesTmp['guid'], 0, 760);
@@ -309,12 +217,12 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			return 0;
 		}
 		FreshRSS_UserDAO::touch();
-		$sql = 'UPDATE `' . $this->prefix . 'entry` '
+		$sql = 'UPDATE `_entry` '
 			. 'SET is_favorite=? '
 			. 'WHERE id IN (' . str_repeat('?,', count($ids) - 1). '?)';
 		$values = array($is_favorite ? 1 : 0);
 		$values = array_merge($values, $ids);
-		$stm = $this->bd->prepare($sql);
+		$stm = $this->pdo->prepare($sql);
 		if ($stm && $stm->execute($values)) {
 			return $stm->rowCount();
 		} else {
@@ -336,11 +244,11 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 	 * @return boolean
 	 */
 	protected function updateCacheUnreads($catId = false, $feedId = false) {
-		$sql = 'UPDATE `' . $this->prefix . 'feed` f '
+		$sql = 'UPDATE `_feed` f '
 			. 'LEFT OUTER JOIN ('
 			.	'SELECT e.id_feed, '
 			.	'COUNT(*) AS nbUnreads '
-			.	'FROM `' . $this->prefix . 'entry` e '
+			.	'FROM `_entry` e '
 			.	'WHERE e.is_read=0 '
 			.	'GROUP BY e.id_feed'
 			. ') x ON x.id_feed=f.id '
@@ -359,7 +267,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			$sql .= ' f.category=?';
 			$values[] = $catId;
 		}
-		$stm = $this->bd->prepare($sql);
+		$stm = $this->pdo->prepare($sql);
 		if ($stm && $stm->execute($values)) {
 			return true;
 		} else {
@@ -393,12 +301,12 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 				return $affected;
 			}
 
-			$sql = 'UPDATE `' . $this->prefix . 'entry` '
+			$sql = 'UPDATE `_entry` '
 				 . 'SET is_read=? '
 				 . 'WHERE id IN (' . str_repeat('?,', count($ids) - 1). '?)';
 			$values = array($is_read ? 1 : 0);
 			$values = array_merge($values, $ids);
-			$stm = $this->bd->prepare($sql);
+			$stm = $this->pdo->prepare($sql);
 			if (!($stm && $stm->execute($values))) {
 				$info = $stm == null ? array(2 => 'syntax error') : $stm->errorInfo();
 				Minz_Log::error('SQL error markRead: ' . $info[2]);
@@ -410,12 +318,12 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			}
 			return $affected;
 		} else {
-			$sql = 'UPDATE `' . $this->prefix . 'entry` e INNER JOIN `' . $this->prefix . 'feed` f ON e.id_feed=f.id '
+			$sql = 'UPDATE `_entry` e INNER JOIN `_feed` f ON e.id_feed=f.id '
 				 . 'SET e.is_read=?,'
 				 . 'f.`cache_nbUnreads`=f.`cache_nbUnreads`' . ($is_read ? '-' : '+') . '1 '
 				 . 'WHERE e.id=? AND e.is_read=?';
 			$values = array($is_read ? 1 : 0, $ids, $is_read ? 0 : 1);
-			$stm = $this->bd->prepare($sql);
+			$stm = $this->pdo->prepare($sql);
 			if ($stm && $stm->execute($values)) {
 				return $stm->rowCount();
 			} else {
@@ -454,7 +362,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			Minz_Log::debug('Calling markReadEntries(0) is deprecated!');
 		}
 
-		$sql = 'UPDATE `' . $this->prefix . 'entry` e INNER JOIN `' . $this->prefix . 'feed` f ON e.id_feed=f.id '
+		$sql = 'UPDATE `_entry` e INNER JOIN `_feed` f ON e.id_feed=f.id '
 			 . 'SET e.is_read=? '
 			 . 'WHERE e.is_read <> ? AND e.id <= ?';
 		if ($onlyFavorites) {
@@ -466,7 +374,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 
 		list($searchValues, $search) = $this->sqlListEntriesWhere('e.', $filters, $state);
 
-		$stm = $this->bd->prepare($sql . $search);
+		$stm = $this->pdo->prepare($sql . $search);
 		if (!($stm && $stm->execute(array_merge($values, $searchValues)))) {
 			$info = $stm == null ? array(2 => 'syntax error') : $stm->errorInfo();
 			Minz_Log::error('SQL error markReadEntries: ' . $info[2]);
@@ -497,14 +405,14 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			Minz_Log::debug('Calling markReadCat(0) is deprecated!');
 		}
 
-		$sql = 'UPDATE `' . $this->prefix . 'entry` e INNER JOIN `' . $this->prefix . 'feed` f ON e.id_feed=f.id '
+		$sql = 'UPDATE `_entry` e INNER JOIN `_feed` f ON e.id_feed=f.id '
 			 . 'SET e.is_read=? '
 			 . 'WHERE f.category=? AND e.is_read <> ? AND e.id <= ?';
 		$values = array($is_read ? 1 : 0, $id, $is_read ? 1 : 0, $idMax);
 
 		list($searchValues, $search) = $this->sqlListEntriesWhere('e.', $filters, $state);
 
-		$stm = $this->bd->prepare($sql . $search);
+		$stm = $this->pdo->prepare($sql . $search);
 		if (!($stm && $stm->execute(array_merge($values, $searchValues)))) {
 			$info = $stm == null ? array(2 => 'syntax error') : $stm->errorInfo();
 			Minz_Log::error('SQL error markReadCat: ' . $info[2]);
@@ -534,39 +442,39 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			$idMax = time() . '000000';
 			Minz_Log::debug('Calling markReadFeed(0) is deprecated!');
 		}
-		$this->bd->beginTransaction();
+		$this->pdo->beginTransaction();
 
-		$sql = 'UPDATE `' . $this->prefix . 'entry` '
+		$sql = 'UPDATE `_entry` '
 			 . 'SET is_read=? '
 			 . 'WHERE id_feed=? AND is_read <> ? AND id <= ?';
 		$values = array($is_read ? 1 : 0, $id_feed, $is_read ? 1 : 0, $idMax);
 
 		list($searchValues, $search) = $this->sqlListEntriesWhere('', $filters, $state);
 
-		$stm = $this->bd->prepare($sql . $search);
+		$stm = $this->pdo->prepare($sql . $search);
 		if (!($stm && $stm->execute(array_merge($values, $searchValues)))) {
 			$info = $stm == null ? array(2 => 'syntax error') : $stm->errorInfo();
 			Minz_Log::error('SQL error markReadFeed: ' . $info[2] . ' with SQL: ' . $sql . $search);
-			$this->bd->rollBack();
+			$this->pdo->rollBack();
 			return false;
 		}
 		$affected = $stm->rowCount();
 
 		if ($affected > 0) {
-			$sql = 'UPDATE `' . $this->prefix . 'feed` '
+			$sql = 'UPDATE `_feed` '
 				 . 'SET `cache_nbUnreads`=`cache_nbUnreads`-' . $affected
-				 . ' WHERE id=?';
-			$values = array($id_feed);
-			$stm = $this->bd->prepare($sql);
+				 . ' WHERE id=:id';
+			$stm = $this->pdo->prepare($sql);
+			$stm->bindParam(':id', $id_feed, PDO::PARAM_INT);
 			if (!($stm && $stm->execute($values))) {
 				$info = $stm == null ? array(2 => 'syntax error') : $stm->errorInfo();
 				Minz_Log::error('SQL error markReadFeed cache: ' . $info[2]);
-				$this->bd->rollBack();
+				$this->pdo->rollBack();
 				return false;
 			}
 		}
 
-		$this->bd->commit();
+		$this->pdo->commit();
 		return $affected;
 	}
 
@@ -583,7 +491,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			Minz_Log::debug('Calling markReadTag(0) is deprecated!');
 		}
 
-		$sql = 'UPDATE `' . $this->prefix . 'entry` e INNER JOIN `' . $this->prefix . 'entrytag` et ON et.id_entry = e.id '
+		$sql = 'UPDATE `_entry` e INNER JOIN `_entrytag` et ON et.id_entry = e.id '
 			 . 'SET e.is_read = ? '
 			 . 'WHERE '
 			 . ($id == '' ? '' : 'et.id_tag = ? AND ')
@@ -597,7 +505,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 
 		list($searchValues, $search) = $this->sqlListEntriesWhere('e.', $filters, $state);
 
-		$stm = $this->bd->prepare($sql . $search);
+		$stm = $this->pdo->prepare($sql . $search);
 		if (!($stm && $stm->execute(array_merge($values, $searchValues)))) {
 			$info = $stm == null ? array(2 => 'syntax error') : $stm->errorInfo();
 			Minz_Log::error('SQL error markReadTag: ' . $info[2]);
@@ -611,18 +519,20 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 	}
 
 	public function cleanOldEntries($id_feed, $date_min, $keep = 15) {	//Remember to call updateCachedValue($id_feed) or updateCachedValues() just after
-		$sql = 'DELETE FROM `' . $this->prefix . 'entry` '
-		     . 'WHERE id_feed=:id_feed AND id<=:id_max '
+		$sql = 'DELETE FROM `_entry` '
+		     . 'WHERE id_feed=:id_feed1 AND id<=:id_max '
 		     . 'AND is_favorite=0 '	//Do not remove favourites
-		     . 'AND `lastSeen` < (SELECT maxLastSeen FROM (SELECT (MAX(e3.`lastSeen`)-99) AS maxLastSeen FROM `' . $this->prefix . 'entry` e3 WHERE e3.id_feed=:id_feed) recent) '	//Do not remove the most newly seen articles, plus a few seconds of tolerance
-		     . 'AND id NOT IN (SELECT id_entry FROM `' . $this->prefix . 'entrytag`) '	//Do not purge tagged entries
-		     . 'AND id NOT IN (SELECT id FROM (SELECT e2.id FROM `' . $this->prefix . 'entry` e2 WHERE e2.id_feed=:id_feed ORDER BY id DESC LIMIT :keep) keep)';	//Double select: MySQL doesn't support 'LIMIT & IN/ALL/ANY/SOME subquery'
-		$stm = $this->bd->prepare($sql);
+		     . 'AND `lastSeen` < (SELECT maxLastSeen FROM (SELECT (MAX(e3.`lastSeen`)-99) AS maxLastSeen FROM `_entry` e3 WHERE e3.id_feed=:id_feed2) recent) '	//Do not remove the most newly seen articles, plus a few seconds of tolerance
+		     . 'AND id NOT IN (SELECT id_entry FROM `_entrytag`) '	//Do not purge tagged entries
+		     . 'AND id NOT IN (SELECT id FROM (SELECT e2.id FROM `_entry` e2 WHERE e2.id_feed=:id_feed3 ORDER BY id DESC LIMIT :keep) keep)';	//Double select: MySQL doesn't support 'LIMIT & IN/ALL/ANY/SOME subquery'
+		$stm = $this->pdo->prepare($sql);
 
 		if ($stm) {
 			$id_max = intval($date_min) . '000000';
-			$stm->bindParam(':id_feed', $id_feed, PDO::PARAM_INT);
 			$stm->bindParam(':id_max', $id_max, PDO::PARAM_STR);
+			$stm->bindParam(':id_feed1', $id_feed, PDO::PARAM_INT);
+			$stm->bindParam(':id_feed2', $id_feed, PDO::PARAM_INT);
+			$stm->bindParam(':id_feed3', $id_feed, PDO::PARAM_INT);
 			$stm->bindParam(':keep', $keep, PDO::PARAM_INT);
 		}
 
@@ -642,9 +552,8 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 		$sql = 'SELECT id, guid, title, author, '
 			. ($this->isCompressed() ? 'UNCOMPRESS(content_bin) AS content' : 'content')
 			. ', link, date, `lastSeen`, ' . $this->sqlHexEncode('hash') . ' AS hash, is_read, is_favorite, id_feed, tags '
-			. 'FROM `' . $this->prefix . 'entry`';
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+			. 'FROM `_entry`';
+		$stm = $this->pdo->query($sql);
 		while ($row = $stm->fetch(PDO::FETCH_ASSOC)) {
 			yield $row;
 		}
@@ -655,15 +564,11 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 		$sql = 'SELECT id, guid, title, author, '
 			. ($this->isCompressed() ? 'UNCOMPRESS(content_bin) AS content' : 'content')
 			. ', link, date, is_read, is_favorite, id_feed, tags '
-			. 'FROM `' . $this->prefix . 'entry` WHERE id_feed=? AND guid=?';
-		$stm = $this->bd->prepare($sql);
-
-		$values = array(
-			$id_feed,
-			$guid,
-		);
-
-		$stm->execute($values);
+			. 'FROM `_entry` WHERE id_feed=:id_feed AND guid=:guid';
+		$stm = $this->pdo->prepare($sql);
+		$stm->bindParam(':id_feed', $id_feed, PDO::PARAM_INT);
+		$stm->bindParam(':guid', $guid);
+		$stm->execute();
 		$res = $stm->fetchAll(PDO::FETCH_ASSOC);
 		$entries = self::daoToEntries($res);
 		return isset($entries[0]) ? $entries[0] : null;
@@ -673,22 +578,21 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 		$sql = 'SELECT id, guid, title, author, '
 			. ($this->isCompressed() ? 'UNCOMPRESS(content_bin) AS content' : 'content')
 			. ', link, date, is_read, is_favorite, id_feed, tags '
-			. 'FROM `' . $this->prefix . 'entry` WHERE id=?';
-		$stm = $this->bd->prepare($sql);
-
-		$values = array($id);
-
-		$stm->execute($values);
+			. 'FROM `_entry` WHERE id=:id';
+		$stm = $this->pdo->prepare($sql);
+		$stm->bindParam(':id', $id, PDO::PARAM_INT);
+		$stm->execute();
 		$res = $stm->fetchAll(PDO::FETCH_ASSOC);
 		$entries = self::daoToEntries($res);
 		return isset($entries[0]) ? $entries[0] : null;
 	}
 
 	public function searchIdByGuid($id_feed, $guid) {
-		$sql = 'SELECT id FROM `' . $this->prefix . 'entry` WHERE id_feed=? AND guid=?';
-		$stm = $this->bd->prepare($sql);
-		$values = array($id_feed, $guid);
-		$stm->execute($values);
+		$sql = 'SELECT id FROM `_entry` WHERE id_feed=:id_feed AND guid=:guid';
+		$stm = $this->pdo->prepare($sql);
+		$stm->bindParam(':id_feed', $id_feed, PDO::PARAM_INT);
+		$stm->bindParam(':guid', $guid);
+		$stm->execute();
 		$res = $stm->fetchAll(PDO::FETCH_COLUMN, 0);
 		return isset($res[0]) ? $res[0] : null;
 	}
@@ -872,7 +776,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			$where .= '1=1 ';
 			break;
 		case 'ST':	//Starred or tagged
-			$where .= 'e.is_favorite=1 OR EXISTS (SELECT et2.id_tag FROM `' . $this->prefix . 'entrytag` et2 WHERE et2.id_entry = e.id) ';
+			$where .= 'e.is_favorite=1 OR EXISTS (SELECT et2.id_tag FROM `_entrytag` et2 WHERE et2.id_entry = e.id) ';
 			break;
 		default:
 			throw new FreshRSS_EntriesGetter_Exception('Bad type in Entry->listByType: [' . $type . ']!');
@@ -883,9 +787,9 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 		return array(array_merge($values, $searchValues),
 			'SELECT '
 			. ($type === 'T' ? 'DISTINCT ' : '')
-			. 'e.id FROM `' . $this->prefix . 'entry` e '
-			. 'INNER JOIN `' . $this->prefix . 'feed` f ON e.id_feed = f.id '
-			. ($type === 't' || $type === 'T' ? 'INNER JOIN `' . $this->prefix . 'entrytag` et ON et.id_entry = e.id ' : '')
+			. 'e.id FROM `_entry` e '
+			. 'INNER JOIN `_feed` f ON e.id_feed = f.id '
+			. ($type === 't' || $type === 'T' ? 'INNER JOIN `_entrytag` et ON et.id_entry = e.id ' : '')
 			. 'WHERE ' . $where
 			. $search
 			. 'ORDER BY e.id ' . $order
@@ -898,13 +802,13 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 		$sql = 'SELECT e0.id, e0.guid, e0.title, e0.author, '
 			. ($this->isCompressed() ? 'UNCOMPRESS(content_bin) AS content' : 'content')
 			. ', e0.link, e0.date, e0.is_read, e0.is_favorite, e0.id_feed, e0.tags '
-			. 'FROM `' . $this->prefix . 'entry` e0 '
+			. 'FROM `_entry` e0 '
 			. 'INNER JOIN ('
 			. $sql
 			. ') e2 ON e2.id=e0.id '
 			. 'ORDER BY e0.id ' . $order;
 
-		$stm = $this->bd->prepare($sql);
+		$stm = $this->pdo->prepare($sql);
 		if ($stm && $stm->execute($values)) {
 			return $stm;
 		} else {
@@ -931,11 +835,11 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 		$sql = 'SELECT id, guid, title, author, '
 			. ($this->isCompressed() ? 'UNCOMPRESS(content_bin) AS content' : 'content')
 			. ', link, date, is_read, is_favorite, id_feed, tags '
-			. 'FROM `' . $this->prefix . 'entry` '
+			. 'FROM `_entry` '
 			. 'WHERE id IN (' . str_repeat('?,', count($ids) - 1). '?) '
 			. 'ORDER BY id ' . $order;
 
-		$stm = $this->bd->prepare($sql);
+		$stm = $this->pdo->prepare($sql);
 		$stm->execute($ids);
 		return self::daoToEntries($stm->fetchAll(PDO::FETCH_ASSOC));
 	}
@@ -943,7 +847,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 	public function listIdsWhere($type = 'a', $id = '', $state = FreshRSS_Entry::STATE_ALL, $order = 'DESC', $limit = 1, $firstId = '', $filters = null) {	//For API
 		list($values, $sql) = $this->sqlListWhere($type, $id, $state, $order, $limit, $firstId, $filters);
 
-		$stm = $this->bd->prepare($sql);
+		$stm = $this->pdo->prepare($sql);
 		$stm->execute($values);
 
 		return $stm->fetchAll(PDO::FETCH_COLUMN, 0);
@@ -954,8 +858,8 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			return array();
 		}
 		$guids = array_unique($guids);
-		$sql = 'SELECT guid, ' . $this->sqlHexEncode('hash') . ' AS hex_hash FROM `' . $this->prefix . 'entry` WHERE id_feed=? AND guid IN (' . str_repeat('?,', count($guids) - 1). '?)';
-		$stm = $this->bd->prepare($sql);
+		$sql = 'SELECT guid, ' . $this->sqlHexEncode('hash') . ' AS hex_hash FROM `_entry` WHERE id_feed=? AND guid IN (' . str_repeat('?,', count($guids) - 1). '?)';
+		$stm = $this->pdo->prepare($sql);
 		$values = array($id_feed);
 		$values = array_merge($values, $guids);
 		if ($stm && $stm->execute($values)) {
@@ -980,8 +884,8 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 		if (count($guids) < 1) {
 			return 0;
 		}
-		$sql = 'UPDATE `' . $this->prefix . 'entry` SET `lastSeen`=? WHERE id_feed=? AND guid IN (' . str_repeat('?,', count($guids) - 1). '?)';
-		$stm = $this->bd->prepare($sql);
+		$sql = 'UPDATE `_entry` SET `lastSeen`=? WHERE id_feed=? AND guid IN (' . str_repeat('?,', count($guids) - 1). '?)';
+		$stm = $this->pdo->prepare($sql);
 		if ($mtime <= 0) {
 			$mtime = time();
 		}
@@ -1001,68 +905,67 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 	}
 
 	public function countUnreadRead() {
-		$sql = 'SELECT COUNT(e.id) AS count FROM `' . $this->prefix . 'entry` e INNER JOIN `' . $this->prefix . 'feed` f ON e.id_feed=f.id WHERE f.priority > 0'
-			. ' UNION SELECT COUNT(e.id) AS count FROM `' . $this->prefix . 'entry` e INNER JOIN `' . $this->prefix . 'feed` f ON e.id_feed=f.id WHERE f.priority > 0 AND e.is_read=0';
-		$stm = $this->bd->prepare($sql);
-		if ($stm == false) {
+		$sql = 'SELECT COUNT(e.id) AS count FROM `_entry` e INNER JOIN `_feed` f ON e.id_feed=f.id WHERE f.priority > 0'
+			. ' UNION SELECT COUNT(e.id) AS count FROM `_entry` e INNER JOIN `_feed` f ON e.id_feed=f.id WHERE f.priority > 0 AND e.is_read=0';
+		$stm = $this->pdo->query($sql);
+		if ($stm === false) {
 			return false;
 		}
-		$stm->execute();
 		$res = $stm->fetchAll(PDO::FETCH_COLUMN, 0);
 		rsort($res);
 		$all = empty($res[0]) ? 0 : $res[0];
 		$unread = empty($res[1]) ? 0 : $res[1];
 		return array('all' => $all, 'unread' => $unread, 'read' => $all - $unread);
 	}
+
 	public function count($minPriority = null) {
-		$sql = 'SELECT COUNT(e.id) AS count FROM `' . $this->prefix . 'entry` e';
+		$sql = 'SELECT COUNT(e.id) AS count FROM `_entry` e';
 		if ($minPriority !== null) {
-			$sql .= ' INNER JOIN `' . $this->prefix . 'feed` f ON e.id_feed=f.id';
+			$sql .= ' INNER JOIN `_feed` f ON e.id_feed=f.id';
 			$sql .= ' WHERE f.priority > ' . intval($minPriority);
 		}
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+		$stm = $this->pdo->query($sql);
 		$res = $stm->fetchAll(PDO::FETCH_COLUMN, 0);
 		return isset($res[0]) ? $res[0] : 0;
 	}
+
 	public function countNotRead($minPriority = null) {
-		$sql = 'SELECT COUNT(e.id) AS count FROM `' . $this->prefix . 'entry` e';
+		$sql = 'SELECT COUNT(e.id) AS count FROM `_entry` e';
 		if ($minPriority !== null) {
-			$sql .= ' INNER JOIN `' . $this->prefix . 'feed` f ON e.id_feed=f.id';
+			$sql .= ' INNER JOIN `_feed` f ON e.id_feed=f.id';
 		}
 		$sql .= ' WHERE e.is_read=0';
 		if ($minPriority !== null) {
 			$sql .= ' AND f.priority > ' . intval($minPriority);
 		}
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+		$stm = $this->pdo->query($sql);
 		$res = $stm->fetchAll(PDO::FETCH_COLUMN, 0);
 		return $res[0];
 	}
 
 	public function countUnreadReadFavorites() {
-		$sql = <<<SQL
-  SELECT c
-    FROM (
-         SELECT COUNT(e1.id) AS c
-              , 1 AS o
-           FROM `{$this->prefix}entry` AS e1
-           JOIN `{$this->prefix}feed` AS f1 ON e1.id_feed = f1.id
-          WHERE e1.is_favorite = 1
-            AND f1.priority >= :priority_normal
-         UNION
-         SELECT COUNT(e2.id) AS c
-              , 2 AS o
-           FROM `{$this->prefix}entry` AS e2
-           JOIN `{$this->prefix}feed` AS f2 ON e2.id_feed = f2.id
-          WHERE e2.is_favorite = 1
-            AND e2.is_read = 0
-            AND f2.priority >= :priority_normal
-         ) u
+		$sql = <<<'SQL'
+SELECT c FROM (
+	SELECT COUNT(e1.id) AS c, 1 AS o
+		 FROM `_entry` AS e1
+		 JOIN `_feed` AS f1 ON e1.id_feed = f1.id
+		WHERE e1.is_favorite = 1
+		  AND f1.priority >= :priority_normal1
+	UNION
+	SELECT COUNT(e2.id) AS c, 2 AS o
+		 FROM `_entry` AS e2
+		 JOIN `_feed` AS f2 ON e2.id_feed = f2.id
+		WHERE e2.is_favorite = 1
+		  AND e2.is_read = 0
+		  AND f2.priority >= :priority_normal2
+	) u
 ORDER BY o
 SQL;
-		$stm = $this->bd->prepare($sql);
-		$stm->execute(array(':priority_normal' => FreshRSS_Feed::PRIORITY_NORMAL));
+		$stm = $this->pdo->prepare($sql);
+		//Binding a value more than once is not standard and does not work with native prepared statements (e.g. MySQL) https://bugs.php.net/bug.php?id=40417
+		$stm->bindValue(':priority_normal1', FreshRSS_Feed::PRIORITY_NORMAL, PDO::PARAM_INT);
+		$stm->bindValue(':priority_normal2', FreshRSS_Feed::PRIORITY_NORMAL, PDO::PARAM_INT);
+		$stm->execute();
 		$res = $stm->fetchAll(PDO::FETCH_COLUMN, 0);
 		rsort($res);
 		$all = empty($res[0]) ? 0 : $res[0];