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, 16 insertions, 31 deletions

diff --git a/app/Models/StatsDAO.php b/app/Models/StatsDAO.php
index 67ada73f7..cbfa79c61 100644
--- a/app/Models/StatsDAO.php
+++ b/app/Models/StatsDAO.php
@@ -45,13 +45,11 @@ SELECT COUNT(1) AS total,
 COUNT(1) - SUM(e.is_read) AS count_unreads,
 SUM(e.is_read) AS count_reads,
 SUM(e.is_favorite) AS count_favorites
-FROM `{$this->prefix}entry` AS e
-, `{$this->prefix}feed` AS f
+FROM `_entry` AS e, `_feed` AS f
 WHERE e.id_feed = f.id
 {$filter}
 SQL;
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+		$stm = $this->pdo->query($sql);
 		$res = $stm->fetchAll(PDO::FETCH_ASSOC);
 
 		return $res[0];
@@ -73,13 +71,12 @@ SQL;
 		$sql = <<<SQL
 SELECT {$sqlDay} AS day,
 COUNT(*) as count
-FROM `{$this->prefix}entry`
+FROM `_entry`
 WHERE date >= {$oldest} AND date < {$midnight}
 GROUP BY day
 ORDER BY day ASC
 SQL;
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+		$stm = $this->pdo->query($sql);
 		$res = $stm->fetchAll(PDO::FETCH_ASSOC);
 
 		foreach ($res as $value) {
@@ -143,14 +140,13 @@ SQL;
 		$sql = <<<SQL
 SELECT DATE_FORMAT(FROM_UNIXTIME(e.date), '{$period}') AS period
 , COUNT(1) AS count
-FROM `{$this->prefix}entry` AS e
+FROM `_entry` AS e
 {$restrict}
 GROUP BY period
 ORDER BY period ASC
 SQL;
 
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+		$stm = $this->pdo->query($sql);
 		$res = $stm->fetchAll(PDO::FETCH_NAMED);
 
 		$repartition = array();
@@ -207,11 +203,10 @@ SQL;
 SELECT COUNT(1) AS count
 , MIN(date) AS date_min
 , MAX(date) AS date_max
-FROM `{$this->prefix}entry` AS e
+FROM `_entry` AS e
 {$restrict}
 SQL;
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+		$stm = $this->pdo->query($sql);
 		$res = $stm->fetch(PDO::FETCH_NAMED);
 		$date_min = new \DateTime();
 		$date_min->setTimestamp($res['date_min']);
@@ -251,14 +246,12 @@ SQL;
 		$sql = <<<SQL
 SELECT c.name AS label
 , COUNT(f.id) AS data
-FROM `{$this->prefix}category` AS c,
-`{$this->prefix}feed` AS f
+FROM `_category` AS c, `_feed` AS f
 WHERE c.id = f.category
 GROUP BY label
 ORDER BY data DESC
 SQL;
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+		$stm = $this->pdo->query($sql);
 		$res = $stm->fetchAll(PDO::FETCH_ASSOC);
 
 		return $res;
@@ -274,16 +267,13 @@ SQL;
 		$sql = <<<SQL
 SELECT c.name AS label
 , COUNT(e.id) AS data
-FROM `{$this->prefix}category` AS c,
-`{$this->prefix}feed` AS f,
-`{$this->prefix}entry` AS e
+FROM `_category` AS c, `_feed` AS f, `_entry` AS e
 WHERE c.id = f.category
 AND f.id = e.id_feed
 GROUP BY label
 ORDER BY data DESC
 SQL;
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+		$stm = $this->pdo->query($sql);
 		$res = $stm->fetchAll(PDO::FETCH_ASSOC);
 
 		return $res;
@@ -300,17 +290,14 @@ SELECT f.id AS id
 , MAX(f.name) AS name
 , MAX(c.name) AS category
 , COUNT(e.id) AS count
-FROM `{$this->prefix}category` AS c,
-`{$this->prefix}feed` AS f,
-`{$this->prefix}entry` AS e
+FROM `_category` AS c, `_feed` AS f, `_entry` AS e
 WHERE c.id = f.category
 AND f.id = e.id_feed
 GROUP BY f.id
 ORDER BY count DESC
 LIMIT 10
 SQL;
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+		$stm = $this->pdo->query($sql);
 		return $stm->fetchAll(PDO::FETCH_ASSOC);
 	}
 
@@ -325,14 +312,12 @@ SELECT MAX(f.id) as id
 , MAX(f.name) AS name
 , MAX(date) AS last_date
 , COUNT(*) AS nb_articles
-FROM `{$this->prefix}feed` AS f,
-`{$this->prefix}entry` AS e
+FROM `_feed` AS f, `_entry` AS e
 WHERE f.id = e.id_feed
 GROUP BY f.id
 ORDER BY name
 SQL;
-		$stm = $this->bd->prepare($sql);
-		$stm->execute();
+		$stm = $this->pdo->query($sql);
 		return $stm->fetchAll(PDO::FETCH_ASSOC);
 	}