本文介紹Ubuntu 15.04下安裝Mysql
- ubuntu 15.04安裝mysql
- django項目連接mysql
1.sudo apt-get install mysql-server
2.apt-get install client
3.sudo apt-get install libmysqlclient-dev
安裝過程中會提示輸入用戶密碼，輸入即可。
sudo netstat -tap | grep mysql
檢查mysql是否安裝成功，如下顯示就是安裝成功了。
mingwei@mingwei:~$ sudo netstat -tap | grep mysql
[sudo] password for mingwei:
tcp 0 0 localhost:mysql *:* LISTEN 23411/mysqld
mingwei@mingwei:~$
4.mysql -u root -p
進入數據庫, -u是用戶名，這裏是root用戶，-p是密碼
5.show databases;
查看所有數據庫 結尾出有 “；”
6.use databasename
使用制定的庫文件 databasename是數據庫名
7.show tables;
列出所有表 結尾出有 “；”
8.create database databasename
創建一個庫，databasename是庫名
創建好之後測試看庫有沒有，第二部分我們使用django來連接這個庫試試。
二.連接數據庫
接下來我們在web項目中測試連接mysql
1.在django項目的app下的的models.py下編寫項目的model，然後django自身的ORM會讀取這些model，並在數據庫中創建相應的表，字段。
我們寫的例子如下：
from django.db import models
# Create your models here.
class blogPost(models.Model):
blog_title=models.CharField(max_length=150)
blog_body=models.TextField()
blog_timestamp=models.DateTimeField()2.在web項目下的settings.py下面配置mysql數據庫的連接參數
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'mysite',
'USER': 'root',
'PASSWORD': '123456',
'HOST': '127.0.0.1',
'PORT': '3306',
}
}3.測試連接數據庫
python manage.py check
如果是這樣：數據庫連接失敗了，查看結尾的提示，No module named MySqldb，
mingwei@mingwei:~/mysite$ python manage.py check
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/mingwei/.local/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
utility.execute()
File "/home/mingwei/.local/lib/python2.7/site-packages/django/core/management/__init__.py", line 312, in execute
django.setup()
File "/home/mingwei/.local/lib/python2.7/site-packages/django/__init__.py", line 18, in setup
apps.populate(settings.INSTALLED_APPS)
File "/home/mingwei/.local/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate
app_config.import_models(all_models)
File "/home/mingwei/.local/lib/python2.7/site-packages/django/apps/config.py", line 198, in import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/home/mingwei/.local/lib/python2.7/site-packages/django/contrib/auth/models.py", line 41, in <module>
class Permission(models.Model):
File "/home/mingwei/.local/lib/python2.7/site-packages/django/db/models/base.py", line 139, in __new__
new_class.add_to_class('_meta', Options(meta, **kwargs))
File "/home/mingwei/.local/lib/python2.7/site-packages/django/db/models/base.py", line 324, in add_to_class
value.contribute_to_class(cls, name)
File "/home/mingwei/.local/lib/python2.7/site-packages/django/db/models/options.py", line 250, in contribute_to_class
self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
File "/home/mingwei/.local/lib/python2.7/site-packages/django/db/__init__.py", line 36, in __getattr__
return getattr(connections[DEFAULT_DB_ALIAS], item)
File "/home/mingwei/.local/lib/python2.7/site-packages/django/db/utils.py", line 240, in __getitem__
backend = load_backend(db['ENGINE'])
File "/home/mingwei/.local/lib/python2.7/site-packages/django/db/utils.py", line 111, in load_backend
return import_module('%s.base' % backend_name)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/home/mingwei/.local/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 27, in <module>
raise ImproperlyConfigured("Error loading MySQLdb module: %s" % e)
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb
缺少python連接數據的庫，我們需要安裝一下：
sudo apt-get install python-mysqldb
安裝完之後再測試，如果不報錯就說明安裝成功了。
4.根據我我們編寫的model來生成數據庫
python manage.py syncdb
mingwei@mingwei:~/mysite$ python manage.py syncdb
/home/mingwei/.local/lib/python2.7/site-packages/django/core/management/commands/syncdb.py:24: RemovedInDjango19Warning: The syncdb command will be removed in Django 1.9
warnings.warn("The syncdb command will be removed in Django 1.9", RemovedInDjango19Warning)
Operations to perform:
Synchronize unmigrated apps: staticfiles, messages
Apply all migrations: admin, contenttypes, auth, sessions
Synchronizing apps without migrations:
Creating tables...
Running deferred SQL...
Installing custom SQL...
Running migrations:
Rendering model states... DONE
Applying contenttypes.0001_initial... OK
Applying auth.0001_initial... OK
Applying admin.0001_initial... OK
Applying contenttypes.0002_remove_content_type_name... OK
Applying auth.0002_alter_permission_name_max_length... OK
Applying auth.0003_alter_user_email_max_length... OK
Applying auth.0004_alter_user_username_opts... OK
Applying auth.0005_alter_user_last_login_null... OK
Applying auth.0006_require_contenttypes_0002... OK
Applying sessions.0001_initial... OK
You have installed Django's auth system, and don't have any superusers defined.
Would you like to create one now? (yes/no): yes
Username (leave blank to use 'mingwei'):
Email address:
Password:
Password (again):
Error: Blank passwords aren't allowed.
Password:
Password (again):
Superuser created successfully.
生成了一大堆的東西，並且下面有successfully我都以爲成功了，然後跑到mysql下去看，看到的是這樣的，
mysite的庫確實生成了，但是表並沒有生成：
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysite |
| mysql |
| performance_schema |
+--------------------+
use mysite 進入庫下面：
show tables;列出所有表，發現只有一些用戶表：奇了怪了，說好的orm自動生成呢？
mysql> show tables;
+----------------------------+
| Tables_in_mysite |
+----------------------------+
| auth_group |
| auth_group_permissions |
| auth_permission |
| auth_user |
| auth_user_groups |
| auth_user_user_permissions |
| django_admin_log |
| django_content_type |
| django_migrations |
| django_session |
+----------------------------+
然後發現了是這個原因導致的，刪掉你app項目下的 migrations文件夾，重新python manage.py syncdb, 哇。。。數據庫奇蹟般的生成了,,,,,如下表：bolg_bolgpost
mysql> show tables;
+----------------------------+
| Tables_in_mysite |
+----------------------------+
| auth_group |
| auth_group_permissions |
| auth_permission |
| auth_user |
| auth_user_groups |
| auth_user_user_permissions |
| blog_blogpost |
| django_admin_log |
| django_content_type |
| django_migrations |
| django_session |
+----------------------------+
11 rows in set (0.00 sec)
