連線MySQL有兩個模組：mysqldb和pymysql，第一個在Python3.x上不能用，所以我們學pymysql

import pymysql

# 建立連線
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', password='mysql8', db='mysqltest')
# 建立遊標(游標)
cursor = conn.cursor()
# 執行SQL，返回影響行數
effect_rows = cursor.execute("select * from tt")
print(effect_rows)
 
# 取前兩條
print(cursor.fetchmany(2))
# 取第一條
print(cursor.fetchone())
# 取所有
print(cursor.fetchall())
# 用批量插入語句插入data
data = [(7,'gg'),(8,'hh'),(9,'ii')]
cursor.executemany("insert into tt values(%s, %s)", data)
conn.commit()
cursor.close()
conn.close()