Hi, I am writing some unit tests, and I am getting blocked waiting for a
metadata lock (in MySQL) due to an open connection.
The code is roughly:
metadata.drop_all(engine)
metadata.create_all(engine)
conn = engine.connect()
sql = sa.text('select * from table')
rows =
I have a script.py that does roughly this:
import sqlalchemy as sa
engine = ...
part_text = """RANGE COLUMNS (my_date) (
PARTITION p20161017 VALUES LESS THAN ('2016-10-18'),
PARTITION p20161018 VALUES LESS THAN ('2016-10-19'),
PARTITION p1231 VALUES LESS THAN (MAXVALUE)
)"""
t
When I print a select statement, my bindparams show as %s instead of as named
params. What could be the cause of this?
>>> myparam
BindParameter('myparamname', 'hello', type_=Unicode())
>>> print(table.c.colname == myparam)
table.colname = :myparamname
>>>
How do I do an update join using SQLAlchemy core? In MySQL, it'd be something
like this:
update a left outer join b
on a.x = b.x
set a.y = 1
where b.x is null
In other words, I want to modify a but only for the rows that do not exist in b
according to my join criterion. The naive attempt that
Using base_columns() gets me pretty close but it doesnt indicate when a column
has multiple base columns due to an equality join clause. It only returns a
single base column for each column.
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I am generating select queries that include alias tables, literal columns,
renamed columns via label, multiple joins etc.
The queries can be somewhat complex and as a debugging feature, I'd like be
able to know which columns came from which tables...but I don't want to store
this information
Thanks, the blog post was very helpful. ClauseAdapter provided exactly what was
needed.
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I'm using SQLAlchemy Core. A user prepares an "on" expression for a join query
and passes it to a function. The goal of the function is to hide some messy
details the must be done to perform the join. Part of these details include
doing a subselect. So in the implentation, the subselect is
