flask 連接mysql相關操作

1   安裝flask連接數據庫模塊flask-sqlalchemy

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[root@django flask]# pip install flask-sqlalchemy Collecting flask-sqlalchemy   Downloading Flask-SQLAlchemy-2.0.tar.gz (93kB)     100% |################################| 94kB 111kB/s Requirement already satisfied (use --upgrade to upgrade): Flask>=0.10 in /usr/lib/python2.7/site-packages (fromflask-sqlalchemy) Collecting SQLAlchemy (from flask-sqlalchemy)   Downloading SQLAlchemy-0.9.9.tar.gz (4.2MB)     100% |################################| 4.2MB 16kB/s

2  安裝mysql-python

[root@django flask]# pip install mysql-python

3  生成mysql數據庫

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[root@django flask]# cat db.py from flask import Flask import MySQLdb from flask.ext.sqlalchemy import SQLAlchemy    app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] ='mysql://root:123456@localhost/flask' db = SQLAlchemy(app)   class User(db.Model):     id = db.Column(db.Integer, primary_key=True)     username = db.Column(db.String(80), unique=True)     email = db.Column(db.String(320), unique=True)     phone = db.Column(db.String(32), nullable=False)        def __init__(self, username, email, phone):         self.username = username         self.email = email         self.phone= phone if __name__ == '__main__':         db.create_all()

primary_key  主鍵      db.create_all()表示執行mysql語句

python db.py執行完後，查看數據庫有沒有這個表

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mysql> use flask; 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 mysql> desc user; +----------+--------------+------+-----+---------+----------------+ | Field    | Type         | Null | Key | Default | Extra          | +----------+--------------+------+-----+---------+----------------+ | id       | int(11)      | NO   | PRI | NULL    | auto_increment | | username | varchar(80)  | YES  | UNI | NULL    |                | | email    | varchar(320) | YES  | UNI | NULL    |                | | phone    | varchar(32)  | NO   |     | NULL    |                | +----------+--------------+------+-----+---------+----------------+ 4 rows in set (0.00 sec)

 

以上就是顯示說明是成功的，mysql連接簡單操作很輕鬆的

 

4  插入數據

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[root@django flask]# cat  insert.db from flask import Flask import MySQLdb from flask.ext.sqlalchemy import SQLAlchemy    app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] ='mysql://root:123456@localhost/flask' db = SQLAlchemy(app)   class User(db.Model):     id = db.Column(db.Integer, primary_key=True)     username = db.Column(db.String(80), unique=True)     email = db.Column(db.String(320), unique=True)     phone = db.Column(db.String(32), nullable=False)        def __init__(self, username, email, phone):         self.username = username         self.email = email         self.phone= phone inset=User(username='itmin', email='[email protected]', phone='13812345678') db.session.add(inset) db.session.commit()

 

查看下數據庫

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mysql> select * from User; ERROR 1146 (42S02): Table 'flask.User' doesn't exist mysql> select * from user; +----+----------+--------------+-------------+ | id | username | email        | phone       | +----+----------+--------------+-------------+ |  1 | itmin    | [email protected] | 13812345678 | +----+----------+--------------+-------------+ 1 row in set (0.00 sec)

 

5  查詢數據庫

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[root@django flask]# cat select.db from flask import Flask import MySQLdb from flask.ext.sqlalchemy import SQLAlchemy    <span style="color: rgb(255, 0, 0);">from sqlalchemy importand_,not_,or_</span> app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] ='mysql://root:123456@localhost/flask' db = SQLAlchemy(app)   class User(db.Model):     id = db.Column(db.Integer, primary_key=True)     username = db.Column(db.String(80), unique=True)     email = db.Column(db.String(320), unique=True)     phone = db.Column(db.String(32), nullable=False)        def __init__(self, username, email, phone):         self.username = username         self.email = email         self.phone= phone     def __repr__(self):         return "<User '{:s}'>".format(self.username)         # return 'User %r' % self.username select_=User.query.filter_by(username='itmin').first() print(select_.id) #精確查詢，並查找出ID   printUser.query.filter(User.email.endswith('@qq.com')).all()#模糊查詢   printUser.query.filter(User.phone.endswith('13812345678')).all()   print User.query.filter(User.username != 'yoyo').first()#反條件查詢，非   printUser.query.filter(not_(User.username=='yoyo')).first()

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#反條件查詢，非

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print User.query.filter(or_(User.username != 'yoyo', User.email.endswith('@example.com'))).first()   #或查詢 print User.query.filter(and_(User.username != 'yoyo', User.email.endswith('@example.com'))).first()  #與查詢 print User.query.limit(10).all() #查詢返回的數據的數目   data_all=User.query.all() print (data_all)#查詢全部   for i in range(len(data_all)):  print data_all[i].username+" "+data_all[i].email+" "+data_all[i].phone

#循環拿出全部數據

 

結果:

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[root@django flask]# python select.db 1 [<User 'itmin'>, <User 'yoyo'>] [<User 'itmin'>] <User 'itmin'> <User 'itmin'> <User 'itmin'> [<User 'itmin'>] [<User 'itmin'>, <User 'yoyo'>] itmin [email protected] 13812345678 yoyo [email protected] 13812345679

 

 

6  更新數據

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[root@django flask]# cat update.py from flask import Flask import MySQLdb from flask.ext.sqlalchemy import SQLAlchemy    app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] ='mysql://root:123456@localhost/flask' db = SQLAlchemy(app)   class User(db.Model):     id = db.Column(db.Integer, primary_key=True)     username = db.Column(db.String(80), unique=True)     email = db.Column(db.String(320), unique=True)     phone = db.Column(db.String(32), nullable=False)        def __init__(self, username, email, phone):         self.username = username         self.email = email         self.phone= phone news=User.query.all() print news news[1].username='test' db.session.commit()

7   刪除數據

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[root@django flask]# cat delete.py from flask import Flask import MySQLdb from flask.ext.sqlalchemy import SQLAlchemy    app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] ='mysql://root:123456@localhost/flask' db = SQLAlchemy(app)   class User(db.Model):     id = db.Column(db.Integer, primary_key=True)     username = db.Column(db.String(80), unique=True)     email = db.Column(db.String(320), unique=True)     phone = db.Column(db.String(32), nullable=False)        def __init__(self, username, email, phone):         self.username = username         self.email = email         self.phone= phone   name=User.query.filter_by(username = 'bb').first() db.session.delete(name) db.session.commit()