MySQL 连接器无法处理参数

Question

I'm trying to loop through an array and insert each element into a table. As far as I can see my syntax is correct and I took this code straight from Microsoft Azure's documentation .

try:
   conn = mysql.connector.connect(**config)
   print("Connection established")
except mysql.connector.Error as err:
  if err.errno == errorcode.ER_ACCESS_DENIED_ERROR:
    print("Something is wrong with the user name or password")
  elif err.errno == errorcode.ER_BAD_DB_ERROR:
    print("Database does not exist")
  else:
    print(err)
else:
  cursor = conn.cursor()
data = ['1','2','3','4','5']


for x in data:
   cursor.execute("INSERT INTO test (serial) VALUES (%s)",(x))
   print("Inserted",cursor.rowcount,"row(s) of data.")

conn.commit()
cursor.close()
conn.close()
print("Done.")

When I run this is gets to cursor.execute(...) and then fails. Here is the stack trace.

Traceback (most recent call last): File "test.py", line 29, in cursor.execute("INSERT INTO test (serial) VALUES (%s)",("test")) File "C:\Users\AlexJ\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\cursor_cext.py", line 248, in execute prepared = self._cnx.prepare_for_mysql(params) File "C:\Users\AlexJ\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\connection_cext.py", line 538, in prepare_for_mysql raise ValueError("Could not process parameters") ValueError: Could not process parameters

Answer 1

Try this:

for x in data:
    value = "test"
    query = "INSERT INTO test (serial) VALUES (%s)"
    cursor.execute(query,(value,))
    print("Inserted",cursor.rowcount,"row(s) of data.")

Since you are using mysql module, cursor.execute requires a sql query and a tuple as parameters

Answer 2

Nice answer from @lucas, but maybe this help other, cz i think more cleaner

sql = "INSERT INTO your_db (your_table) VALUES (%s)"
val = [("data could be array")]
cursor = cnx.cursor()
cursor.execute(sql, val)
print("Inserted",cursor.rowcount,"row(s) of data.")
cnx.commit()
cnx.close()

Cz this is useful for my purpose, to input multiple data.

Answer 3

I'm facing same issue but instead of array, I'm looping through a set and insert each item into mysql db and got this error mysql.connector.errors.ProgrammingError: Could not process parameters: str(Data_Tokens), it must be of type list, tuple or dict .

The uniqueTokenSet includes string data type, but as error shows that it must be list, tuple or dict. By converting item to list of tuple [(item)] work for me.

uniqueTokenSet = set()

for item in uniqueTokenSet:
    tokenSql = "insert into tokens(token) values (%s)"
    data = [(item)]
    mycursor.execute(tokenSql, data)

print('data inserted')
mydb.commit()