python - 参数 ？不使用 python postgres

Question

我将 python 与 postgres 一起使用，我正在尝试这个简单的查询，但它不起作用，我无法找到原因

con = psycopg2.connect(**config)


self.cursor.execute("INSERT INTO mytable (id, age, year) VALUES (nextval('my_id_seq'), ?, ?)", ('77', '44'))

我收到这个错误

psycopg2.ProgrammingError: syntax error at or near "," LINE 1: ...year) VALUES (nextval('my_id_seq'), ?, ?)

编辑

这是错误

INSERT INTO mytable (id, age, year) VALUES (nextval('my_id_seq'), %s, %s)
'6.65', '4955/1'

  File "off.py", line 80, in writeRows
    self.cursor.execute(query, values)
TypeError: not all arguments converted during string formatting

代码:

data = [('age', '6.65'), ('year', '4974/1'), . . ]
cols = ",".join(data.keys())
qmarks = ','.join(['%s' for s in data.keys()])
query = "INSERT INTO mytable (id, %s) VALUES (nextval('my_id_seq'), %s)" % (cols,qmarks)
self.cursor.execute(query, values)

Answer 1

psycopg2 使用pyformat 参数样式:

>>> import psycopg2
>>> psycopg2.paramstyle
'pyformat'

将参数标记?替换为%s。

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参见 PEP 249 -- Python Database API Specification v2.0 - paramstyle .