python操作数据库

python操作数据库

插入数据

• import pymysql
  conn = pymysql.Connection(host = '127.0.0.1',user = 'root',password = '123',database = 'day39')
  
  cur = conn.cursor()
  
  username = "太亮"
  sql = 'insert into employee(emp_name,sex,age,hire_date) values (%s,"female",88,20170808)'
  cur.execute(sql,(username,))
  conn.commit()#插入需要提交,不然只是在内存中做出了操作,数据库中数据没改变
  
  cur.close()
  conn.close()
  

查询数据

• #查询
  import pymysql
  conn = pymysql.Connection(host = '127.0.0.1',user = 'root',password = '123',database = 'day39')
  cur = conn.cursor()#游标数据库操作符
  
  sql = 'select emp_name,salary from employee where age < %s'
  cur.execute(sql,(80,))
  
  #获取结果
  ret1 = cur.fetchone()#接受一个数据
  ret2 = cur.fetchmany(2)#接受多个数据,可设定参数
  ret3 = cur.fetchall()#全部接受
  
  print(ret1)
  print(ret2)
  print(ret3)
  
  cur.close()
  conn.close()
  

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