LAST_INSERT_ID() always returns 0 (RMySQL) - separate connection issue

Question

Original example as found in some post

According to this post the following SQL statements should give me a vector 1, 2, 2, 2, 2 in the end:

Answer 1

We found a very interesting solution:

res <- dbSendQuery(con, "INSERT INTO t VALUES (5);")
res <- dbSendQuery(con, "SELECT LAST_INSERT_ID();")
fetch(res)

If it does not work, use a dbClearResult(res) before sending the last id request. For us it worked out.