如何使用python pymysql库进行常见数据库操作？

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批量插入数据到MySQL的函数如下：

pythonimport 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` (列名1, 列名2, ...) VALUES (%s, %s, ...) cursor.executemany(sql, to_db_list) mysql_db.commit() cursor.close() mysql_db.close()

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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