import pymysql
ccon=pymysql.connect(
    host=‘127.0.0.1‘,
    user=‘root‘,
    password=‘password‘,
    port=3306,
    db=‘sys‘,
    charset=‘utf8‘

)
cur=ccon.cursor()
sql=‘select*from sys_config ‘
cur.execute(sql)
data=cur.fetchall()
for i in data[:2]:
    print(i)
cur.close()
ccon.close()
...

(‘diagnostics.allow_i_s_tables‘, ‘OFF‘, datetime.datetime(2020, 9, 7, 23, 32, 8), None)
(‘diagnostics.include_raw‘, ‘OFF‘, datetime.datetime(2020, 9, 7, 23, 32, 8), None)

#mysql 数据库中的自带sys库，查询其中表名为sys_config的前两条数据

python数据库查询