python3—连接本地与远程机器的mysql数据库，在特定数据表中增加数据、查询数据
-------------------------------------本地的mysql数据库--------------------------------------1、python3连接mysql出现如下错误:
root@kali:~/pywork# python3 conn_mysql_test.py
(1698, "Access denied for user 'root'@'localhost'")
Traceback (most recent call last):
File "conn_mysql_test.py", line 23, in <module>
db = connect_mysql()
File "conn_mysql_test.py", line 19, in connect_mysql
return cms
UnboundLocalError: local variable 'cms' referenced before assignment
root@kali:~/pywork#
问题解决方式如下：
参考：https://blog.csdn.net/junli_chen/article/details/51220179
进入本机的mysql数据库中：
root@kali:/etc/mysql# mysql -u root -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 33
Server version: 10.1.26-MariaDB-1 Debian buildd-unstable
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show databases
-> ;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| python3db |
+--------------------+
4 rows in set (0.01 sec)
MariaDB [(none)]> grant all privileges on *.* to 'root'@'localhost' identified by 'root' with grant option;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 33
Current database: *** NONE ***
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]>2、本机数据库数据情况：
root@kali:/etc/mysql# mysql -u root -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 33
Server version: 10.1.26-MariaDB-1 Debian buildd-unstable
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> CREATE DATABASE IF NOT EXISTS python3db DEFAULT CHARSET utf8;#创建数据库python3db
Query OK, 1 row affected (0.01 sec)
MariaDB [(none)]> show databases
-> ;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| python3db |
+--------------------+
4 rows in set (0.01 sec)
ariaDB [(none)]> use python3db
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
MariaDB [python3db]> CREATE TABLE user (name VARCHAR(20), sex CHAR(1), birth DATE, birthaddr VARCHAR(20));#创建user数据表
Query OK, 0 rows affected (0.07 sec)
MariaDB [python3db]>
MariaDB [python3db]> show tables;
+---------------------+
| Tables_in_python3db |
+---------------------+
| user |
+---------------------+
1 row in set (0.00 sec)
MariaDB [python3db]>
MariaDB [python3db]> select * from user;
+---------+------+------------+-----------+
| name | sex | birth | birthaddr |
+---------+------+------------+-----------+
| python3 | f | 2017-06-21 | shenzhen |
| python3 | m | 2018-05-01 | hangzhou |
| lilei | m | 2018-05-01 | hangzhou |
| mayun | m | 2019-05-01 | guagzhou |
| mayun | f | 2019-05-23 | dayuan |
+---------+------+------------+-----------+
5 rows in set (0.00 sec)
MariaDB [python3db]>
3、使用python3语句在user数据表中增加数据，并查询user数据表的所有数据
Python源码：
root@kali:~/pywork# cat conn_mysql_test.py
#!/usr/bin/python3.6
# --*-- coding:utf-8 --*--
import pymysql
def connect_mysql():
db_config = {
'host':'127.0.0.1',#本机数据库地址
'port':3306,
'user':'root',
'password':'root',
'db':'python3db',#需要连接的数据库
'charset':'utf8mb4'#编码
}
try:
cms = pymysql.connect(**db_config)
cur = cms.cursor()#获取一个游标
cur.execute("insert into user values('xuweiwei','m','2008-05-21','nanchangshi');")#在user数据表插入一条数据
cur.execute('flush privileges;')#必须实时更新数据
cur.execute('select * from user;')#查询USER数据表中所有数据
data = cur.fetchall()
for d in data:#打印查询的数据
print('name: '+str(d[0])+'\t'+'sex: '+str(d[1])+'\t'+'birth: '+str(d[2])+'\t'+'birthaddr: '+str(d[3]))
cur.close()
except Exception as e:
print(e)
db = connect_mysql()
#print(dir(db))
#print(type(db))
root@kali:~/pywork#
4、脚本运行后情况如下：
root@kali:~/pywork# python3 conn_mysql_test.py
name: python3 sex: f birth: 2017-06-21 birthaddr: shenzhen
name: python3 sex: m birth: 2018-05-01 birthaddr: hangzhou
name: lilei sex: m birth: 2018-05-01 birthaddr: hangzhou
name: mayun sex: m birth: 2019-05-01 birthaddr: guagzhou
name: mayun sex: f birth: 2019-05-23 birthaddr: dayuan
name: xuweiwei sex: m birth: 2008-05-21 birthaddr: nanchangshi
root@kali:~/pywork#
5、再到本机的mysql查询到数据如下：
MariaDB [python3db]>
MariaDB [python3db]> select * from user;
+----------+------+------------+-------------+
| name | sex | birth | birthaddr |
+----------+------+------------+-------------+
| python3 | f | 2017-06-21 | shenzhen |
| python3 | m | 2018-05-01 | hangzhou |
| lilei | m | 2018-05-01 | hangzhou |
| mayun | m | 2019-05-01 | guagzhou |
| mayun | f | 2019-05-23 | dayuan |
| xuweiwei | m | 2008-05-21 | nanchangshi |
+----------+------+------------+-------------+
6 rows in set (0.00 sec)
MariaDB [python3db]> *************************远程windows server 2003的mysql数据库***************6、连接远程的windows server 2003服务器的数据库读取数据
python源码：
root@kali:~/pywork# cat conn_mysql_remote.py
#!/usr/bin/python3.6
# --*-- coding:utf-8 --*--
import pymysql
def connect_mysql():
db_config = {
'host':'192.168.40.239',#远程windows server 2003数据库地址
'port':3306,
'user':'root',
'password':'root',
'db':'test',#需要连接的数据库test
'charset':'utf8mb4'#编码
}
try:
cms = pymysql.connect(**db_config)
cur = cms.cursor()#获取一个游标
cur.execute("insert into member values('12','python','1234567890');")#在member数据表插入一条数据
cur.execute('flush privileges;')#必须实时更新数据
cur.execute('select * from member;')#查询member数据表中所有数据
data = cur.fetchall()
for d in data:#打印查询的member数据表的数据
print('User ID: '+str(d[0])+'\t'+'user: '+str(d[1])+'\t'+'password: '+str(d[2]))
cur.close()
except Exception as e:
print(e)
db = connect_mysql()
#print(dir(db))
#print(type(db))
root@kali:~/pywork# 7、python脚本第一次运行会出现如下报错信息（没有权限）：
root@kali:~/pywork# python3.6 conn_mysql_remote.py
(1130, "Host '192.168.40.240' is not allowed to connect to this MySQL server")
root@kali:~/pywork#
解决办法为：
在windows server 2003服务器的数据库中修改以下内容：
参考：https://www.cnblogs.com/Bighua/p/7629082.html
查看user表中的数据：select Host, User,Password from user;
修改user表中的Host:update user set Host='%' where User='root';
最后刷新一下：flush privileges;8、连接远程服务器的数据库情况如下：
root@kali:~/pywork# vi conn_mysql_remote.py
root@kali:~/pywork# python3.6 conn_mysql_remote.py
User ID: 7 user: lifeifei password: 2556336555355
User ID: 2 user: daxuexe password: 12345678ee
User ID: 10 user: wumingjun password: 368228687741
User ID: 3 user: xuweibo password: 145263
User ID: 4 user: wumingjun password: 185256696889
User ID: 5 user: xiedidi password: 147258663555
User ID: 6 user: lilei password: 2341234124512
User ID: 1 user: hangguo password: 1221412r34
User ID: 9 user: damaomao password: 345325fwewr325
User ID: 8 user: maoxuxu password: 34324523ffw3e4
User ID: 11 user: python password: 1234567890
User ID: 12 user: python password: 1234567890
root@kali:~/pywork#