Sqlite executemany or union select for reduced db writes

I'm trying to reduce the number of writes to a Sqlite database when it comes to inserting multiple rows into a table.

I've found two methods of doing this so far, using a union select statement or using the executemany command in sqlite3.

Does executemany work via a single write?

For reference, please see the following statement I'm using (union select):

INSERT INTO table1
SELECT "hello" AS field1, 15 AS field2, 1262340000 AS timestamp 
UNION SELECT "byebye", 10, 1262340000 
UNION SELECT "hi", 20, 1262340000 
UNION SELECT "boo", 25, 1262340000 

Thank you