psycopg2.errors.SyntaxError: syntax error at or near

Question

每当我尝试更新一行时，Psycopg2 都会给我这个错误：

Traceback (most recent call last):
  File "p:/Projects/Freelance/Optometry_Inventory/code/tester.py", line 39, in <module>
    new_user.updateUser(*(fname, lname, username, role, hashed_pwd, user_id))
  File "p:\Projects\Freelance\Optometry_Inventory\code\UserDC.py", line 64, in updateUser
    cursor.execute(update_query, args)
psycopg2.errors.SyntaxError: syntax error at or near "lname"
LINE 1: UPDATE users SET fname= ('a'), SET lname= ('b'),

当我运行以下函数时：

def updateUser(self, user_id):
        self.user_id = user_id
        update_query = """UPDATE users SET fname= %s, SET lname= (%s),
         SET username= (%s), SET user_role= (%s), SET h_pwd= (%s), WHERE user_id= (%s)"""
        with pool() as cursor:
            cursor.execute(update_query, (self.fname, self.lname, self.user_name,
                           self.user_role, self.user_pwd, self.user_id))

我试过只更新一个字段，但我仍然遇到同样的错误。还有什么我想念的吗？错误代码没有提供太多信息。

Answer 1

问题是您为每个修改的列冗余地写了 SET，一个 SET 就足够了:)

def updateUser(self, user_id):
    self.user_id = user_id
    update_query = """
        UPDATE users 
        SET fname= %s, 
            lname= (%s),
            username= (%s), 
            user_role= (%s),
            h_pwd= (%s) 
        WHERE user_id= (%s)"""
        with pool() as cursor:
            cursor.execute(update_query, (self.fname, self.lname, self.user_name,
                           self.user_role, self.user_pwd, self.user_id))

Answer 2

如果您想节省一些打字时间，还有：

import psycopg2

con = psycopg2.connect(...)
cur = con.cursor()
update_query = """
        UPDATE users 
        SET 
         (fname, lname, username,user_role, h_pwd)
          =
         (%s, %s, %s, %s, %s)
        WHERE user_id= (%s)"""
cursor.execute(update_query, (self.fname, self.lname, self.user_name,
                           self.user_role, self.user_pwd, self.user_id))

如果您一次进行多个更新，您可能还想看看 execute_values。在 link 的 execute_values 部分有一个 UPDATE 示例。

psycopg2.errors.SyntaxError: syntax error at or near

psycopg2.errors.SyntaxError: syntax error at or near

python

postgresql

psycopg2