第 9 天 python操作mysql数据库

Posted 2020-06-26 芳草天涯

1、插入操作：

 1 #!/uer/bin/env python
 2 # -*- coding:utf-8 -*-
 3 
 4 import mysqldb
 5 
 6 conn = MySQLdb.connect(host=‘192.168.1.100‘,user=‘root‘,passwd=‘123456‘,db=‘oldb‘)
 7 
 8 cur = conn.cursor()
 9 
10 reCount = cur.execute(‘insert into students(Name,sex,age,tel) values(%s,%s,%s,%s)‘,(‘alex2‘,‘man‘,19,‘18923143‘))
11 # reCount = cur.execute(‘select * from students;‘)
12 
13 conn.commit()
14 cur.close()
15 conn.close()
16 print(reCount)

输出信息:

3

2、查询操作

 1 #!/uer/bin/env python
 2 # -*- coding:utf-8 -*-
 3 
 4 import MySQLdb
 5 
 6 conn = MySQLdb.connect(host=‘192.168.1.100‘,user=‘root‘,passwd=‘123456‘,db=‘oldb‘)
 7 
 8 cur = conn.cursor()
 9 
10 # reCount = cur.execute(‘insert into students(Name,sex,age,tel) values(%s,%s,%s,%s)‘,(‘alex4‘,‘man‘,29,‘18923143‘))
11 reCount = cur.execute(‘select * from students;‘)
12 
13 
14 print(cur.fetchone())
----------------------------------
15 print(cur.fetchall()) #取出所有数据

----------------------------------

16 print(cur.fetchmany(3)) #指定3 条数据

输出信息:

(1L, ‘alex‘, ‘man‘, 18, ‘151515151‘)

------------------------------------

((1L, ‘alex‘, ‘man‘, 18, ‘151515151‘)

(2L, ‘alex2‘, ‘man‘, 19, ‘18923143‘)

(3L, ‘alex2‘, ‘man‘, 19, ‘18923143‘))

-------------------------------------

()

3、批量插入数据

 1 #!/uer/bin/env python
 2 # -*- coding:utf-8 -*-
 3 
 4 import MySQLdb
 5 
 6 conn = MySQLdb.connect(host=‘192.168.1.100‘,user=‘root‘,passwd=‘123456‘,db=‘oldb‘)
 7 
 8 cur = conn.cursor()
 9 
10 li = [
11     (‘tommite‘,‘man‘,29,‘189231432‘),
12     (‘kendi‘,‘man‘,26,‘189231433‘),
13     (‘lili‘,‘man‘,19,‘189231434‘),
14 ]
15 
16 reCount = cur.executemany(‘insert into students(Name,sex,age,tel) values(%s,%s,%s,%s)‘,li)
17 
18 conn.commit()
19 cur.close()
20 conn.close()
21 print(reCount)

输出信息:

3