SQLAlchemy Core 将 select 语句转换为 update 语句

Question

Now, I am using SQLAlchemy Core (NOT ORM) 1.4, and I've got two statements:

stmt1 = sa.select(groups).where(groups.c.id == group_id)
stmt2 = sa.update(groups).where(groups.c.id == group_id)

I would like to know if there's a way to convert stmt1 to stmt2 dynamically because I want to build a statement like this:

# doing something to convert stmt1 to stmt2. is it possible?
stmt2 = stmt2.values(**my_dict)

Thank you for your help.

Answer 1

I found an answer by myself, so I post here.

At first, I asked if I can convert select where to update where using SQLAlchemy core.

It's possible using Select().get_final_froms , but it returns a tuple because we usually select or join with one or more tables.

My purpose was fetching one record which has to be updated.

Thus, I derived the select statement from update statement like this:

stmt_update = sa.update(groups).where(groups.c.id == group_id)

stmt_select = sa.select(stmt_update.table).where(stmt_update.whereclause)

Now I don't have to pass very similar two statements. Thank you.