检查数据并将其插入MySQL数据库节点的有效方法

Question

First Way:

1. Fetch all the records from the database and create a result array.
2. Loop the new inserting array and check the unique id is exist or not with the above result array then inserting to the DB.

Second Way:

1. Loop the new inserting array and check the unique id is exist or not in the database then insert into the database.

Note: Inserting data will be very less compared to the database table data.

Please suggest any best way to do it.

Answer 1

An implemetation of @NigelRen idea

insert into destTable  (id, coln,...)
select st.id,st.coln,...
from srcTable st
left join destTable dt on st.id=dt.id
where dt.id is null

where id is the relation one-to-one between the two tables