python pymysql库的常用操作

批量插入

import pymysql
 
 
def insert_to_mysql(to_db_list):
  mysql_db = pymysql.connect(host="HOST_IP", port=3306, user="username", password="password",
                database="db", charset="utf8")
  cursor = mysql_db.cursor()
  sql = "INSERT INTO `your_db`.`your_table`(`colum1`, `colum2`, `colum3`) VALUES (%s,%s,%s)"
 
  try:
    # cursor.execute()
    cursor.executemany(sql, to_db_list) # 批量插入
     
    effect_rows = cursor.rowcount
     
    mysql_db.commit()
    cursor.close()
    print('数据库添加成功，插入 {}条数据'.format(effect_rows))
    return effect_rows
  except Exception as e:
    mysql_db.rollback()
    print('数据库执行失败')
    print(e)
    return 0
 
my_list = []
my_list.append(('v1', 'v2', 'v3'))
 
cnt = insert_to_mysql(my_list)

查询

def get_id_name():
  cursor = mysql_db.cursor()
  sql = "select id, name from `your_db`.`table`"
  cursor.execute(sql)
  res = cursor.fetchall()
 
  # print(res)
  return res
 
 
my_list = get_id_name()
 
for index in range(len(my_list)):
  print(my_list[index][0]) # id
  print(my_list[index][1]) # name

更新

def update_by_id(update_list):
  """根据ID更新col1, col2, col3
  list 依次为 col1, col2, col3, id
 
  :param update_list:
  :return:
  """
 
  cursor = mysql_db.cursor()
  sql = "UPDATE `your_db`.`table` SET col1=(%s),col2=(%s),col3=(%s) WHERE id=(%s)"
 
  try:
    # cursor.execute()
    cursor.executemany(sql, update_list) # 批量插入
    mysql_db.commit()
    cursor.close()
    print('数据库更新成功')
  except Exception as e:
    mysql_db.rollback()
    print('数据库更新失败')
    print(e)
 
my_list = []
my_list.append(('v1', 'v2', 'v3', 'id'))
update_by_id(my_list)

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