如何在python中将字符串值调用到sql查询中

我试图从容器tn（用户提供的输入）调用字符串值来完成sql查询

# lists is a list in which all table names in the database is stored
ct=0
while ct!=2:
    print("1.Enter the table name you want access")
    print("2.Exit")
    ct=int(input("Enter your choice (1 or 2) :"))
    if ct==1:
        tn=input("Enter table name :")
        break
    elif ct==2:
        sys.exit(0)
    else:
        print("INVALID INPUT")
if tn in lists:
    print()
    print("Table found!")
    mycursor.execute("SELECT * FROM (%s)",(tn,))
for i in mycursor:
    print(i) 

我希望sql查询在执行后变得完整，并向我显示返回的结果（即应该显示用户输入的表）

我在运行代码时收到以下错误消息：-

Traceback (most recent call last):
  File "C:\Users\11c1.System2-PC\Desktop\MYSQL\Mysql (Software).py", line 59, in <module>
    mycursor.execute("SELECT * FROM (%s)",(tn,))
  File "C:\Program Files (x86)\Python37-32\lib\site-packages\mysql\connector\cursor.py", line 551, in execute
    self._handle_result(self._connection.cmd_query(stmt))
  File "C:\Program Files (x86)\Python37-32\lib\site-packages\mysql\connector\connection.py", line 490, in cmd_query
    result = self._handle_result(self._send_cmd(ServerCmd.QUERY, query))
  File "C:\Program Files (x86)\Python37-32\lib\site-packages\mysql\connector\connection.py", line 395, in _handle_result
    raise errors.get_exception(packet)
mysql.connector.errors.ProgrammingError: 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''11c')' at line 1

这会产生如下错误：-

Traceback (most recent call last):
  File "C:\Users\11c1.System2-PC\Desktop\MYSQL\Mysql (Software).py", line 59, in <module>
    mycursor.execute("SELECT * FROM (?)",(tn,))
  File "C:\Program Files (x86)\Python37-32\lib\site-packages\mysql\connector\cursor.py", line 543, in execute
    "Not all parameters were used in the SQL statement")
mysql.connector.errors.ProgrammingError: Not all parameters were used in the SQL statement

回溯（最近一次呼叫最后一次）：
文件“C:\Users\11c1.System2 PC\Desktop\MYSQL\MYSQL（Software.py）”，第59行，在
mycursor.execute（“SELECT*FROM（？），（tn，））
文件“C:\Program Files（x86）\Python37-32\lib\site packages\mysql\connector\cursor.py”，第543行，在execute中
“并非SQL语句中使用了所有参数”）
mysql.connector.errors.ProgrammingError:SQL语句中未使用所有参数

尝试下面的查询syntex：

query= "SELECT * FROM %s"
mycursor.execute(query%(tn,))

---

希望这有帮助

查询中不需要括号。@skannet，试试

mycursor.execute（query，tn）

@OlvinRoght没有相同的错误mysql.connector.errors.ProgrammingError:1064（42000）：您的SQL语法有错误；检查与MySQL服务器版本对应的手册，以获取第行“%s”附近要使用的正确语法1@skannet，在

tn

中是什么，只是表的字符串名？@OlvinRoght

tn

是用户将输入的表名及其数据类型string@skannet,在函数调用之前，您是否尝试过使用调试器并检查

tn

的内容？

query= "SELECT * FROM %s"
mycursor.execute(query%(tn,))