通过execute sql string关键字来执行对数据库的插入操作和删除操作。
（1）、向数据库中插入数据
| connect to database using custom params | pymysql | database=‘world‘,user=‘root‘,password=‘root‘,host=‘localhost‘,port=3306 |
| execute sql string | insert into city(name,countrycode,district,population) values("beijing","zh","china","217100") |
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| disconnect from database |
（2）、从数据库中，删除数据
| connect to database using custom params | pymysql | database=‘world‘,user=‘root‘,password=‘root‘,host=‘localhost‘,port=3306 |
| execute sql string | delete from city where name = "beijing"; | |
| disconnect from database |