Revision 2746
Added by Aaron Marcuse-Kubitza over 12 years ago
| lib/sql_gen.py | ||
|---|---|---|
| 400 | 400 |
filter_out = object() # tells Join to filter out rows that match the join |
| 401 | 401 |
|
| 402 | 402 |
class Join(BasicObject): |
| 403 |
def __init__(self, table, mapping, type_=None): |
|
| 403 |
def __init__(self, table, mapping={}, type_=None):
|
|
| 404 | 404 |
''' |
| 405 | 405 |
@param mapping dict(right_table_col=left_table_col, ...) |
| 406 | 406 |
* if left_table_col is join_same: left_table_col = right_table_col |
| ... | ... | |
| 443 | 443 |
# Create join condition |
| 444 | 444 |
type_ = self.type_ |
| 445 | 445 |
joins = self.mapping |
| 446 |
if type_ is not filter_out and reduce(operator.and_, |
|
| 446 |
if joins == {}: join_cond = None
|
|
| 447 |
elif type_ is not filter_out and reduce(operator.and_, |
|
| 447 | 448 |
(v is join_same_not_null for v in joins.itervalues())): |
| 448 | 449 |
# all cols w/ USING, so can use simpler USING syntax |
| 449 | 450 |
cols = (as_Col(v).to_str(db) for v in joins.iterkeys()) |
| ... | ... | |
| 458 | 459 |
str_ = '' |
| 459 | 460 |
if type_ != None: str_ += type_+' ' |
| 460 | 461 |
str_ += 'JOIN '+left_table.to_str(db) |
| 461 |
if type_ != 'CROSS': str_ += ' '+join_cond
|
|
| 462 |
if join_cond != None: str_ += ' '+join_cond
|
|
| 462 | 463 |
return str_ |
| 463 | 464 |
|
| 464 | 465 |
def __repr__(self): return self.to_str(mockDb, '<left_table>') |
Also available in: Unified diff
sql_gen.py: Join: mapping param defaults to {} for e.g. CROSS JOINs. to_str(): Omit join_cond if mapping is empty, rather than if join is a specific type.