python连接数据库

python连接数据库通过pymysql

1.导入pymysql

import pymysql

2.查询操作

import pymysql  #导入 pymysql

#打开数据库连接，最好加上charset="utf-8"
db= pymysql.connect(host="localhost",user="root",
 password="123456",db="test",port=3307,charset="utf-8")

# 使用cursor()方法获取操作游标
cur = db.cursor()

#1.查询操作
# 编写sql 查询语句  user 对应我的表名
sql = "select * from user"
try:
    cur.execute(sql)    #执行sql语句

    results = cur.fetchall()    #获取查询的所有记录
    print("id","name","password")
    #遍历结果
    for row in results :
        id = row[0]
        name = row[1]
        password = row[2]
        print(id,name,password)
except Exception as e:
    raise e
finally:
    db.close()  #关闭连接