fix PHP 8.1 throws \mysqli_sql_exception or \PDOException for SQL errors

- change them to our regular Api\Db\Exception
- for prop(find|patch) explicitly catch PDOException to deal more graceful with non-ascii prop-names

api/src/Db.php

@@ -776,6 +776,8 @@ class Db
 				return 0;
 			}
 		}
+		try
+		{
 			if ($num_rows > 0)
 			{
 				$rs = $this->Link_ID->SelectLimit($Query_String, $num_rows, (int)$offset, $inputarr);
@@ -784,6 +786,11 @@ class Db
 			{
 				$rs = $this->Link_ID->Execute($Query_String, $inputarr);
 			}
+		}
+		// PHP 8.1 mysqli throws its own exception
+		catch(\mysqli_sql_exception $e) {
+			throw new Db\Exception($e->getMessage(), $e->getCode(), $e);
+		}
 		$this->Row = 0;
 		$this->Errno  = $this->Link_ID->ErrorNo();
 		$this->Error  = $this->Link_ID->ErrorMsg();

api/src/Db/Exception.php

@@ -27,10 +27,10 @@ class Exception extends \egw_exception_db
 	 * @param string $msg =null message, default "Database error!"
 	 * @param int $code =100
 	 */
-	function __construct($msg=null,$code=100)
+	function __construct($msg=null, $code=100, \Exception $previous=null)
 	{
 		if (is_null($msg)) $msg = lang('Database error!');
 
-		parent::__construct($msg,$code);
+		parent::__construct($msg, $code, $previous);
 	}
 }

api/src/Vfs/Sqlfs/StreamWrapper.php

@@ -1875,6 +1875,8 @@ GROUP BY A.fs_id';
 			return false;	// permission denied
 		}
 		$ins_stmt = $del_stmt = null;
+
+		try {
 			foreach ($props as &$prop)
 			{
 				if (!array_key_exists('name', $prop))
@@ -1913,6 +1915,12 @@ GROUP BY A.fs_id';
 					}
 				}
 			}
+		}
+		// catch exception for inserting or deleting non-ascii prop_names
+		catch (\PDOException $e) {
+			_egw_log_exception($e);
+			return false;
+		}
 		return true;
 	}
 
@@ -1945,10 +1953,16 @@ GROUP BY A.fs_id';
 			(!is_null($ns) ? ' AND prop_namespace=?' : '');
 		if (self::LOG_LEVEL > 2) $query = '/* '.__METHOD__.': '.__LINE__.' */ '.$query;
 
+		try {
 			$stmt = self::$pdo->prepare($query);
 			$stmt->setFetchMode(\PDO::FETCH_ASSOC);
 			$stmt->execute(!is_null($ns) ? array($ns) : array());
-
+		}
+		// cat exception trying to search for non-ascii prop_name
+		catch (\PDOException $e) {
+			_egw_log_exception($e);
+			return [];
+		}
 		$props = array();
 		foreach($stmt as $row)
 		{