和一个使用 cursor() 类的游标,然后我们执行 select SQL 语句从表中检索行。 cursor.fetchall() 方法将输出作为元组提供,我们使用切片来获取值并以字典的形式打印出来。 示例:使用 psycopg2 返回类似字典的值 Python3实现 importpsycopg2 conn=psycopg2.connect( database="codes",user='postgres',password='pass',...
'user':'your_username','password':'your_password','host':'localhost','port':5432}deffetch_data_as_dict(query):withconn.cursor(cursor_factory=RealDictCursor)ascursor:cursor.execute(query)results=cursor.fetchall()returnresultstry:# 连接到PostgreSQLconn=psycopg2.connect(**conn_...
_c.fetchall() m = [ dict( identity = r[0], sentence = r[1], numtrees = r[2], best = r[3], target = r[4]) for r in t] except psycopg2.DataError as e: # Fall through with empty m pass return m Example #3Source File: vocab.py From Greynir with GNU General Public ...
conn.cursor() as cur: cur.execute('''SELECT tablename FROM pg_catalog.pg_tables WHERE tablename='%s';''' % self.mode["table"]) rets = cur.fetchall() self.conn.commit() if rets: rets = rets[0] if not self.mode["table"] in rets: # If the DB doesn't exist, set it up....
def fetchall(self): May 9, 2009 Fixed bug in RealDictCursor when prefetching May 9, 2009Blame prior to change e1fae0f, made on May 9, 2009 99 if self._prefetch: Nov 17, 2020 Upgrade Python syntax with pyupgrade --py36-plus Nov 17, 2020Blame prior to change 7babecc, made on No...
Psycopg将tuple适配为record,而AsIs则执行Python的字符串替换操作。
cursor = con.cursor(cursor_factory=psycopg2.extras.DictCursor) cursor.execute("SELECT * FROM cars") rows = cursor.fetchall() for row in rows: print(f"{row['id']} {row['name']} {row['price']}") In this example, we print the contents of thecarstable using the dictionary cursor. ...
处理查询结果:根据需要,可以使用psycopg2提供的方法处理查询结果。例如,使用fetchone()方法获取一行数据,使用fetchall()方法获取所有行数据等。 关闭连接:在完成数据库操作后,使用连接对象的close()方法关闭与数据库的连接,以释放资源: 关闭连接:在完成数据库操作后,使用连接对象的close()方法关闭与数据库的连接,以释放...
# 需要導入模塊: import psycopg2 [as 別名]# 或者: from psycopg2 importError[as 別名]defpopulate_cache(conn):try: cursor = conn.cursor() cursor.execute("SELECT * FROM measurement_types")forrowincursor.fetchall(): measurements_dict[ row[1]] = [row[0], ...
where = users.c.id ==1try:awaitconn.execute(sa.update(users).values({'name':'t'}).where(where))exceptInternalErrorase:asserte.pgcode =='25006'awaitt1.commit()awaitconn.execute(sa.delete(users))assertlen(await(awaitconn.execute(users.select())).fetchall()) ==0 ...