关于sql:python peewee execute_sql()示例

Python Peewee execute_sql() example

我正在使用Peewee模块作为我的项目的ORM。

我看了整个文件，没有清楚关于如何处理db.execute_sql()的结果的示例。

我跟踪代码，只能找到db.execute_sql()返回光标。

是否有人知道如何处理光标，例如迭代光标并获取返回复杂select语句的结果。

更新：我刚从peewee文件夹中找到了以下源代码，应该会有所帮助我来解决这个问题。

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class QueryResultWrapper(object):
"""
Provides an iterator over the results of a raw Query, additionally doing
two things:
- converts rows from the database into python representations
- ensures that multiple iterations do not result in multiple queries
"""
def __init__(self, model, cursor, meta=None):
self.model = model
self.cursor = cursor

self.__ct = 0
self.__idx = 0

self._result_cache = []
self._populated = False
self._initialized = False

if meta is not None:
self.column_meta, self.join_meta = meta
else:
self.column_meta = self.join_meta = None

def __iter__(self):
self.__idx = 0

if not self._populated:
return self
else:
return iter(self._result_cache)

def process_row(self, row):
return row

def iterate(self):
row = self.cursor.fetchone()
if not row:
self._populated = True
raise StopIteration
elif not self._initialized:
self.initialize(self.cursor.description)
self._initialized = True
return self.process_row(row)

def iterator(self):
while True:
yield self.iterate()

def next(self):
if self.__idx self.__ct):
try:
self.next()
except StopIteration:
break