python实战第一天-pymysql模块并练习

操作系统
 
Ubuntu 15.10
 
 
IDE & editor
 
JetBrains PyCharm 5.0.2
 
ipython3
 
 
Python版本
 
python-3.4.3

安装pymysql模块

jim@jim-virtual-machine:~$ pip3 install PyMySQL     
Collecting PyMySQL
  Downloading PyMySQL-0.7.2-py2.py3-none-any.whl (76kB)
    100% |████████████████████████████████| 77kB 18kB/s 
Installing collected packages: PyMySQL

mysql -u root -p

创建数据库
mysql> create database testdb;
Query OK, 1 row affected (0.10 sec)

授权用户访问
mysql> grant all on testdb.* to 'jim'@'127.0.0.1' identified by '123456';
Query OK, 0 rows affected (0.25 sec)

mysql> grant all on testdb.* to 'jim'@'localhost' identified by '123456';
Query OK, 0 rows affected (0.25 sec)

刷新
mysql > flush privileges;
Query OK, 0 rows affected (0.11 sec)

导入pymysql模块

import pymysql
jim@jim-virtual-machine:~$ pip3 list  #显示已安装的模块
上面的忽略
 PyMySQL (0.7.2)
下面的忽略

conn = pymysql.connect(host='127.0.0.1',port=3306,user='jim',password='123456') #创建连接过程

cur = conn.cursor() 创建游标

cur.execute("""CREATE TABLE tbl_category(
   ....: id VARCHAR (1) NOT NULL PRIMARY KEY,
   ....: category VARCHAR (10))""")

####插入一个表、

cur.execute("""CREATE TABLE tbl_category(
   ....: id VARCHAR (1) NOT NULL PRIMARY KEY,
   ....: category VARCHAR (10))""")

#插入数据

cur.execute('''INSERT INTO tbl_category VALUES ('1','aa')''') 
cur.execute('''INSERT INTO tbl_category VALUES ('2','bb')''')

#提交数据

conn.commit()

读取数据

cur.execute("select * from tbl_category")
data = cur.fetchall()

print(data)  
(('1', 'aa'), ('2', '??'), ('3', 'bb'), ('4', 'dd'), ('5', 'aaa'))

判断如果data有值则输出结果

if data:
   .....:     for record in data:
   .....:         print(record)
   .....: 
('1', 'aa')
('2', '??')
('3', 'bb')
('4', 'dd')
('5', 'aaa')