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, 13 insertions, 11 deletions

diff --git a/app/Models/EntryDAOPGSQL.php b/app/Models/EntryDAOPGSQL.php
index e90aa8332..9afea279f 100644
--- a/app/Models/EntryDAOPGSQL.php
+++ b/app/Models/EntryDAOPGSQL.php
@@ -35,25 +35,27 @@ class FreshRSS_EntryDAOPGSQL extends FreshRSS_EntryDAOSQLite {
 	public function commitNewEntries() {
 		$sql = 'DO $$
 DECLARE
-maxrank bigint := (SELECT MAX(id) FROM `' . $this->prefix . 'entrytmp`);
-rank bigint := (SELECT maxrank - COUNT(*) FROM `' . $this->prefix . 'entrytmp`);
+maxrank bigint := (SELECT MAX(id) FROM `_entrytmp`);
+rank bigint := (SELECT maxrank - COUNT(*) FROM `_entrytmp`);
 BEGIN
-	INSERT INTO `' . $this->prefix . 'entry` (id, guid, title, author, content, link, date, `lastSeen`, hash, is_read, is_favorite, id_feed, tags)
-		(SELECT rank + row_number() OVER(ORDER BY date) AS id, guid, title, author, content, link, date, `lastSeen`, hash, is_read, is_favorite, id_feed, tags
-			FROM `' . $this->prefix . 'entrytmp` AS etmp
+	INSERT INTO `_entry`
+		(id, guid, title, author, content, link, date, `lastSeen`, hash, is_read, is_favorite, id_feed, tags)
+		(SELECT rank + row_number() OVER(ORDER BY date) AS id, guid, title, author, content,
+			link, date, `lastSeen`, hash, is_read, is_favorite, id_feed, tags
+			FROM `_entrytmp` AS etmp
 			WHERE NOT EXISTS (
-				SELECT 1 FROM `' . $this->prefix . 'entry` AS ereal
+				SELECT 1 FROM `_entry` AS ereal
 				WHERE (etmp.id = ereal.id) OR (etmp.id_feed = ereal.id_feed AND etmp.guid = ereal.guid))
 			ORDER BY date);
-	DELETE FROM `' . $this->prefix . 'entrytmp` WHERE id <= maxrank;
+	DELETE FROM `_entrytmp` WHERE id <= maxrank;
 END $$;';
-		$hadTransaction = $this->bd->inTransaction();
+		$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;
 	}