pymysql 入门及填坑
1、安装 pymysql
1. pip install pymysql 2. # 或 3. python3 -m pip install PyMySQL
2、官网例子
1）建表
CREATE TABLE `users` ( `id` int(11) NOT NULL AUTO_INCREMENT, `email` varchar(255) COLLATE utf8_bin NOT NULL, `password` varchar(255) COLLATE utf8_bin NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=1 ;
注意：一定要有一个自增的字段，此处为 ‘id’
2）建立连接
import pymysql.cursors # Connect to the database connection = pymysql.connect(host='localhost', user='user', password='passwd', db='db', charset='utf8mb4', cursorclass=pymysql.cursors.DictCursor) try: with connection.cursor() as cursor: # Create a new record sql = "INSERT INTO `users` (`email`, `password`) VALUES (%s, %s)" cursor.execute(sql, ('webmaster@python.org', 'very-secret')) # connection is not autocommit by default. So you must commit to save # your changes. connection.commit() with connection.cursor() as cursor: # Read a single record sql = "SELECT `id`, `password` FROM `users` WHERE `email`=%s" cursor.execute(sql, ('webmaster@python.org',)) result = cursor.fetchone() print(result) finally: connection.close()
输出结果：
{'password': 'very-secret', 'id': 1}
3）注意
%s 是占位符，可以代替所有类型的字段的占位，也可以使用对应类型进行占位，如：
insert_sql = "INSERT INTO EMPLOYEE(FIRST_NAME, LAST_NAME, AGE, SEX, SALARY) VALUES (%s, %s, %s, %s, %s)" # 注意不是'%s'，而是%s args_list = [('Mei', 'Han', 20, 'F', 3000.00), ('Obama', 'Qiao', 57, 'M', 2348.01), ('Jim', 'Cluse', 35, 'F', 2231.01), ('Macer', 'Jordan', 45, 'M', 2340.10)] // 原文链接：https://www.cnblogs.com/smartsmile-yxh/p/11988644.html
或者：
sql = "INSERT INTO EMPLOYEE(FIRST_NAME, LAST_NAME, AGE, SEX, INCOME) VALUES ('%s', '%s', '%d', '%c', '%d' )" % ('Max', 'Su', 25, 'F', 2800) //原文出自【易百教程】，商业转载请联系作者获得授权，非商业请保留原文链接：https://www.yiibai.com/python/python_database_access.html
