Comments (6)
pudo
commented on July 22, 2024
Eli, we've been getting a lot of pull requests in that corner, and things have been a bit chaotic - I hope you'll forgive the missing docs for the moment. We've recently switched to using strings instead of the SQLAlchemy types, but I do feel like we may want to still support passing them in as a fallback.
Thanks for reporting.
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eligundry
commented on July 22, 2024
@pudo So, at this point in time, if I wanted to cast it to a float, what would that string look like?
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pudo
commented on July 22, 2024
Eli, I've just looked at both sources and tried to understand your problem, but it seems to me like everything should be in order. Can you be more specific about how it isn't working, given that you start with a table with no lat/lon columns?
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cli248
commented on July 22, 2024
I've tried @eligundry's source code, it works fine in MySQL. The followings are the code.
table = db['test'] # create a new test table
types = {
'latitude': sqlalchemy.Float,
'longitude': sqlalchemy.Float,
'timestamp': sqlalchemy.DateTime
}
item = dict(latitude=123.456,longitude=789.012,timestamp=date.today())
table.insert(item, types)
insert function inserted item into test table successfully. However, there is an warning,
SAWarning: Unicode type received non-unicode bind param value
And the sqlalchemy.DateTime type was converted to text type in MySQL. as shown in the following.
+-----------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| latitude | float | YES | | NULL | |
| longitude | float | YES | | NULL | |
| timestamp | text | YES | | NULL | |
+-----------+---------+------+-----+---------+----------------+
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cli248
commented on July 22, 2024
Well, I found another issue. If I set value of latitude to integer, not float, as shown below,
item = dict(latitude=123,longitude=789.012,timestamp=date.today())
Although I set latitude to sqlalchemy.Float type in types,
types = {'latitude': sqlalchemy.Float, 'longitude': sqlalchemy.Float, 'timestamp': sqlalchemy.DateTime}
the final type of latitude in MySQL table will be int, not float.
+-----------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| latitude | int(11) | YES | | NULL | |
| timestamp | text | YES | | NULL | |
| longitude | float | YES | | NULL | |
+-----------+---------+------+-----+---------+----------------+
And if I try to insert a new entry into the table with set latitude equals to a float value.
item2 = dict(latitude=124.56)
MySQL will cast float 124.56 to int 125,
+----+----------+------------+-----------+
| id | latitude | timestamp | longitude |
+----+----------+------------+-----------+
| 1 | 123 | 2013-12-11 | 789.012 |
| 2 | 125 | NULL | NULL |
+----+----------+------------+-----------+
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eligundry
commented on July 22, 2024
Thanks for testing my code @cli248! I figured out my problem. For the id field, I was using Twitter's ids, which are BigIntegers, which the type's param doesn't look like it can override. I'll close this. Thanks for the help!
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