tbl_sql: Create an SQL tbl (abstract)
Description
Generally, you should no longer need to provide a custom tbl()
method.
The default tbl.DBIConnect
method should work in most cases.
Usage
tbl_sql(subclass, src, from, ..., vars = NULL, check_from = deprecated())
Arguments
- subclass
name of subclass
- ...
needed for agreement with generic. Not otherwise used.
- vars
Provide column names as a character vector
to avoid retrieving them from the database.
Mainly useful for better performance when creating
multiple tbl
objects.
- check_from