From 4d4678ceb6dcbf9bb055b30bfd39f5f47fcd2156 Mon Sep 17 00:00:00 2001
From: Michael <heluecht@pirati.ca>
Date: Sun, 17 May 2020 09:03:56 +0000
Subject: [PATCH] New experimental database configurations

---
 src/Database/Database.php  |  9 +++++----
 static/defaults.config.php | 17 ++++++++++++++++-
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/src/Database/Database.php b/src/Database/Database.php
index 7adb88ffa..4b39a13e6 100644
--- a/src/Database/Database.php
+++ b/src/Database/Database.php
@@ -135,8 +135,9 @@ class Database
 		}
 
 		$this->emulate_prepares = (bool)$this->configCache->get('database', 'emulate_prepares');
+		$this->pdo_emulate_prepares = (bool)$this->configCache->get('database', 'pdo_emulate_prepares');
 
-		if (class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
+		if (!$this->configCache->get('database', 'disable_pdo') && class_exists('\PDO') && in_array('mysql', PDO::getAvailableDrivers())) {
 			$this->driver = 'pdo';
 			$connect      = "mysql:host=" . $server . ";dbname=" . $db;
 
@@ -150,7 +151,7 @@ class Database
 
 			try {
 				$this->connection = @new PDO($connect, $user, $pass);
-				$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
+				$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->pdo_emulate_prepares);
 				$this->connected = true;
 			} catch (PDOException $e) {
 				$this->connected = false;
@@ -1029,7 +1030,7 @@ class Database
 		$success = $this->e("LOCK TABLES " . DBA::buildTableString($table) . " WRITE");
 
 		if ($this->driver == 'pdo') {
-			$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
+			$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->pdo_emulate_prepares);
 		}
 
 		if (!$success) {
@@ -1062,7 +1063,7 @@ class Database
 		$success = $this->e("UNLOCK TABLES");
 
 		if ($this->driver == 'pdo') {
-			$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
+			$this->connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->pdo_emulate_prepares);
 			$this->e("SET autocommit=1");
 		} else {
 			$this->connection->autocommit(true);
diff --git a/static/defaults.config.php b/static/defaults.config.php
index d0725aa9b..4ef006496 100644
--- a/static/defaults.config.php
+++ b/static/defaults.config.php
@@ -45,8 +45,23 @@ return [
 		'database' => '',
 
 		// charset (String)
-		// Database connexion charset. Changing this value will likely corrupt special characters.
+		// Database connection charset. Changing this value will likely corrupt special characters.
 		'charset' => 'utf8mb4',
+
+		// emulate_prepares (Boolean) (Experimental)
+		// If enabled, prepared statements will be emulated.
+		// In combination with MySQLi this will cast all return values to strings.
+		'emulate_prepares' => false,
+
+		// pdo_emulate_prepares (Boolean) (Experimental)
+		// If enabled, the builtin emulation for prepared statements is used.
+		// Due to limitations of that emulation (all return values are casted as strings)
+		// this will most likely cause issues and should not be used on production systems.
+		'pdo_emulate_prepares' => false,
+
+		// disable_pdo (Boolean)
+		// PDO is used by default (if available). Otherwise MySQLi will be used.
+		'disable_pdo' => false,
 	],
 	'config' => [
 		// admin_email (Comma-separated list)