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Add delete_filler.

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This commit is contained in:
Ethan Dalool 2018-02-25 16:05:22 -08:00
parent 53ab58d693
commit d34aeaaf41
1 changed files with 32 additions and 6 deletions
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38
SQLHelpers/sqlhelpers.py
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@ -1,3 +1,28 @@
def delete_filler(pairs):
'''
Manually aligning the bindings for DELETE statements is annoying.
Given a dictionary of {column: value}, return the "WHERE ..." portion of
the query and the bindings in the correct order.
Example:
pairs={'test': 'toast', 'ping': 'pong'}
->
returns ('WHERE test = ? AND ping = ?', ['toast', 'pong'])
In context:
(qmarks, bindings) = delete_filler(pairs)
query = 'DELETE FROM table %s' % qmarks
cur.execute(query, bindings)
'''
qmarks = []
bindings = []
for (key, value) in pairs.items():
qmarks.append('%s = ?' % key)
bindings.append(value)
qmarks = ' AND '.join(qmarks)
qmarks = 'WHERE %s' % qmarks
return (qmarks, bindings)
def insert_filler(column_names, values, require_all=True):
'''
Manually aligning the bindings for INSERT statements is annoying.
@ -57,8 +82,8 @@ def update_filler(pairs, where_key):
returns ('SET filepath = ? WHERE filepath == ?', ['/newplace', '/oldplace'])
In context:
(query, bindings) = update_filler(data, where_key)
query = 'UPDATE table %s' % query
(qmarks, bindings) = update_filler(data, where_key)
query = 'UPDATE table %s' % qmarks
cur.execute(query, bindings)
'''
pairs = pairs.copy()
@ -68,13 +93,14 @@ def update_filler(pairs, where_key):
if len(pairs) == 0:
raise ValueError('No pairs left after where_key.')
qmarks = []
bindings = []
for (key, value) in pairs.items():
qmarks.append('%s = ?' % key)
bindings.append(value)
bindings.append(where_value)
qmarks = ', '.join(qmarks)
query = 'SET {setters} WHERE {where_key} == ?'
query = query.format(setters=qmarks, where_key=where_key)
return (query, bindings)
setters = ', '.join(qmarks)
qmarks = 'SET {setters} WHERE {where_key} == ?'
qmarks = qmarks.format(setters=setters, where_key=where_key)
return (qmarks, bindings)