Question

I’m failing to read the data from a result into the correct type, for example:

result = engine.execute("SELECT id FROM table WHERE SetId = 5).fetchall()

Column id is of type Long in the MySQL DB

print result
[(1L,), (2L,), (3L,), (4L,), (5L,), (6L,)]


for row in result:
   print row

(1L,) etc..

print type(row)
 <class 'sqlalchemy.engine.base.RowProxy'>

What is the best way reading those values as the correct type Long? I really don’t get how to correctly read out the values from the RowProxy class in general

Answer 1

SQLAlchemy RowProxy instances are not strings, but objects with a string representation when printed.

They act like lists and mappings; if all you need are the long values, just loop over the row:

for row in result:
    for value in row:
        print value

or address each column in the row by it’s index:

for row in result:
    print row[0]

Your query asks for the column id, so that is now a key on the row:

for row in result:
    print row['id']