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, 5 insertions, 2 deletions

diff --git a/app/Models/Category.php b/app/Models/Category.php
index fa711aa66..29c0e586b 100644
--- a/app/Models/Category.php
+++ b/app/Models/Category.php
@@ -68,8 +68,11 @@ class FreshRSS_Category extends Minz_Model {
 		return $this->hasFeedsWithError;
 	}
 
-	public function _id($value) {
-		$this->id = $value;
+	public function _id($id) {
+		$this->id = $id;
+		if ($id == FreshRSS_CategoryDAO::DEFAULTCATEGORYID) {
+			$this->_name(_t('gen.short.default_category'));
+		}
 	}
 	public function _name($value) {
 		$this->name = trim($value);