python操做MySQL数据库

#1-1 建立数据库及其插入，修改，删除数据操做
import MySQLdb
conn= MySQLdb.connect(
        host='localhost',
        port = 3306,
        user='root',
        passwd='970515yjy',
        db ='impeller',
        )
cur = conn.cursor()

#建立数据表
cur.execute("create table material1(id int ,name varchar(100),elastic varchar(100),strength varchar(100))")

#插入一条数据
sqli="insert into material1 values(%s,%s,%s,%s)"
cur.executemany(sqli,[
    ('1','Ti','108000','800-1200'),
    ('2','Al','72000','950'),
    ('5','HighT','100000','2000'),
    ('4','HighT','150000','2000'),
    ])
#修改查询条件的数据
cur.execute("update material1 set id='3' where strength = '2000'")

#删除查询条件的数据
cur.execute("delete from material1 where elastic='150000'")

cur.close()
conn.commit()
conn.close()

#1-2 进行数据库数据的查询提取和展现import MySQLdbconn= MySQLdb.connect(        host='localhost',        port = 3306,        user='root',        passwd='970515yjy',        db ='impeller',        )cur = conn.cursor()#获取表中有多少数据aa=cur.execute("select * from material")print(aa)print(cur.fetchone())print(cur.fetchone())cur.scroll(0,'absolute') #方法能够将游标定位到表中的第一条数据。#依次打印表中的全部的数据cur.scroll(0,'absolute') #方法能够将游标定位到表中的第一条数据。info = cur.fetchmany(2)for ii in info:    print(ii)cur.scroll(0,'absolute') #方法能够将游标定位到表中的第一条数据。info = cur.fetchall()for ii in info:    print(ii)cur.close()conn.commit()conn.close()