Meanings of parameters in RS. Open SQL, Conn

The first parameter is an SQL statement.

Number 2: Conn, that is, database connection

Third parameter:
0. Create a read-only record set that can only be rolled forward.
1. The cursor allows you to add, delete, and modify records, but you cannot see the changes made by other users when your record set is opened.
2. The cursor allows you to add, delete, and modify records, and you can see the modifications made by other users.
3. Create a read-only record set with all positioning functions, that is, it can forward, backward, and can mark bookmarks

Fourth:
1. The record is read-only and cannot be changed.
2. The record is locked when you can edit it.
3. The record is locked when you call the update method to submit your changes
4. If you are batch updating a series of records