sqlite3.Row class, handling duplicate column names resulting from a SQL join

[sockonafish]

BPO	5105

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2009-02-05.14:16:46.926>
created_at = <Date 2009-01-29.23:53:29.911>
labels = ['type-bug', 'library']
title = 'sqlite3.Row class, handling duplicate column names resulting from a SQL join'
updated_at = <Date 2009-02-05.14:16:46.925>
user = 'https://bugs.python.org/sockonafish'

bugs.python.org fields:

activity = <Date 2009-02-05.14:16:46.925>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2009-02-05.14:16:46.926>
closer = 'georg.brandl'
components = ['Library (Lib)']
creation = <Date 2009-01-29.23:53:29.911>
creator = 'sockonafish'
dependencies = []
files = []
hgrepos = []
issue_num = 5105
keywords = []
message_count = 4.0
messages = ['80798', '80847', '80849', '80853']
nosy_count = 2.0
nosy_names = ['ggenellina', 'sockonafish']
pr_nums = []
priority = 'normal'
resolution = 'works for me'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue5105'
versions = ['Python 2.6']

[sockonafish]

When using sqlite3.Row as the row_factory for a sqlite3 connection and
performing a SQL join that returns rows from two or more tables with
identical column names, the returned sqlite3.Row object contains
duplicate keys. Subsequently, when trying to access values by key, only
the value contained in the lowest numbered index matching the key is
returned. Additionally, attempting to use the keys returned to create a
new table in the database fails due to a duplicate column name error.

A better behavior would be for the sqlite3.Row object's indices to be
prefixed with table names for cases in which a query produces results
from two or more tables.

[ggenellina]

I think this is a sqlite issue, not a Python one.
cursor.description should return unique column names.

[ggenellina]

See http://www.sqlite.org/cvstrac/tktview?tn=3221

Try upgrading to the latest sqlite release. Or set "pragma
full_column_names=ON;"

import sqlite3
conn = sqlite3.connect(':memory:')
cursor = conn.cursor()
cursor.execute("create table T (a, b, c)")
cursor.execute("insert into T values (1, 2, 3)")
cursor.execute("insert into T values (2, 3, 4)")
conn.commit()
cursor.execute("pragma short_column_names=OFF;")
cursor.execute("pragma full_column_names=ON;")
cursor.execute("select * from T T1, T T2 where T1.a=T2.b")
print [d[0] for d in cursor.description]
# output: ['T1.a', 'T1.b', 'T1.c', 'T2.a', 'T2.b', 'T2.c']

[sockonafish]

Ah, that's it. Thanks for the tip, this issue can be closed now.