并非所有参数都在 SQL 语句中使用(Python、MySQL)

问题描述

我在以下 Python 代码中遇到错误:

I get an error on the following Python code:

import mysql.connector
cnx = mysql.connector.connect(user='root', password='',
                          host='127.0.0.1',
                          database='DB')
cursor = cnx.cursor()

Name = "James"
Department = "Finance"
StartYear = 2001
CurrentPos = 2001
Link = ""

add_user = ("INSERT INTO DB.tbluser "
       "(username, department, startyear, currentpos, link) "
       "VALUES (%s, %s, %d, %d, %s)")
data_user = (Name, Department, StartYear, CurrentPos, Link)
cursor.execute(add_user, data_user)
cnx.commit()
cursor.close()
cnx.close()

错误信息是

mysql.connector.errors.ProgrammingError: Not all parameters were used in the SQL statement

你明白为什么吗?

推荐答案

参数标记是 %s 而不是 %d.

The parameter marker is %s not %d.

add_user = """INSERT INTO DB.tbluser 
              (username, department, startyear, currentpos, link) 
              VALUES (%s, %s, %s, %s, %s)"""

请注意，mysql.connector 使用的参数标记可能看起来与 Python 字符串格式中使用的 %s 相同，但这种关系只是巧合.一些数据库适配器如 oursql 和 sqlite3 使用 ? 作为参数标记而不是 %s.

Note that the parameter markers used by mysql.connector may look the same as the %s used in Python string formatting but the relationship is only coincidental. Some database adapters like oursql and sqlite3 use ? as the parameter marker instead of %s.

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