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db_demo1/__pycache__/config.cpython-36.pyc

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+# dialect+driver://username:password@host:port/database
+
+DIALECT = 'mysql'
+DRIVER = 'pymysql'
+USERNAME = 'root'
+PASSWORD = 'init#201605'
+HOST = '127.0.0.1'
+PORT = '3306'
+DATABASE = 'db_demo2'
+
+SQLALCHEMY_DATABASE_URI = "{}+{}://{}:{}@{}:{}/{}?charset=utf8".format(DIALECT,DRIVER,USERNAME,PASSWORD,HOST,PORT,DATABASE)
+SQLALCHEMY_TRACK_MODIFICATIONS = False

db_demo1/config.py

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+import config
+
+
+app = Flask(__name__)
+app.config.from_object(config)
+db = SQLAlchemy(app)
+
+#articletable:
+#create table articl(
+#    id int primary key autoincrement,
+#    title varchar(100) not null,
+#    content text not null,
+#)
+
+class Article(db.Model):
+    __tablename__ = 'article'
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    title = db.Column(db.String(100), nullable=False)
+    content = db.Column(db.Text, nullable=False)
+
+db.create_all()
+
+@app.route('/')
+def hello_world():
+    # article1 = Article.query.filter(Article.content == 'bbb').first()
+    # db.session.delete(article1)
+    # db.session.commit()
+
+
+    return 'Hello World!'
+
+
+if __name__ == '__main__':
+    app.run(debug= True)

db_demo1/db_demo1.py

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+# dialect+driver://username:password@host:port/database
+
+DIALECT = 'mysql'
+DRIVER = 'pymysql'
+USERNAME = 'root'
+PASSWORD = 'init#201605'
+HOST = '127.0.0.1'
+PORT = '3306'
+DATABASE = 'db_demo3'
+
+SQLALCHEMY_DATABASE_URI = "{}+{}://{}:{}@{}:{}/{}?charset=utf8".format(DIALECT,DRIVER,USERNAME,PASSWORD,HOST,PORT,DATABASE)
+SQLALCHEMY_TRACK_MODIFICATIONS = False

db_demo3/__pycache__/config.cpython-36.pyc

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+import config
+
+app = Flask(__name__)
+app.config.from_object(config)
+db = SQLAlchemy(app)
+
+class Users(db.Model):
+    __tablename__ = 'users'
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    username = db.Column(db.String(100), nullable=True)
+
+class Article(db.Model):
+    __tablename__ = 'article'
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    title = db.Column(db.String(100), nullable=True)
+    content = db.Column(db.Text, nullable=True)
+    author_id = db.Column(db.Integer,db.ForeignKey('users.id'))
+    author = db.relationship('Users', backref=db.backref('articles'))
+
+db.create_all()
+
+@app.route('/')
+def index():
+    # 先添加一个新user用来添加新文章
+    # user1 = Users(username = 'Zac')
+    # db.session.add(user1)
+    # db.session.commit()
+
+    # 再添加一片新文章
+    # article1 = Article(title = 'title1', content = 'content1', author_id = 1)
+    # db.session.add(article1)
+    # db.session.commit()
+
+    # 找标题为aaa的作者
+    # 复杂方法：
+    # article = Article.query.filter(Article.title == 'title1').first()
+    # author_id = article.author_id
+    # user = Users.query.filter(Users.id == author_id).first()
+    # print(user.username)
+    # 简单方法：
+    # 在Article类中加入author = db.relateionship('Users', backref=db.backref('articles'))
+    # article = Article(title = 'title1', content='content1')
+    # article.author = Users.query.filter(Users.id == 1).first()
+    # db.session.add(article)
+    # db.session.commit()
+    article = Article.query.filter(Article.title == 'title1').first()
+    print(article.author.username)
+    return 'index'
+
+if __name__ == '__main__':
+    app.run(debug=True)

db_demo3/config.py

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+from flask_script import Manager

db_demo3/db_demo3.py

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+# dialect+driver://username:password@host:port/database
+
+DIALECT = 'mysql'
+DRIVER = 'pymysql'
+USERNAME = 'root'
+PASSWORD = 'init#201605'
+HOST = '127.0.0.1'
+PORT = '3306'
+DATABASE = 'db_demo4'
+
+SQLALCHEMY_DATABASE_URI = "{}+{}://{}:{}@{}:{}/{}?charset=utf8".format(DIALECT,DRIVER,USERNAME,PASSWORD,HOST,PORT,DATABASE)
+SQLALCHEMY_TRACK_MODIFICATIONS = False

db_demo3/manage.py

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+import config
+
+app = Flask(__name__)
+app.config.from_object(config)
+db = SQLAlchemy(app)
+
+
+article_tag = db.Table('article_tag',
+        db.Column('article_id', db.Integer, db.ForeignKey('article.id'), primary_key=True),
+        db.Column('tag_id', db.Integer, db.ForeignKey('tag.id'), primary_key=True),
+    )
+
+class Article(db.Model):
+    __tablename__ = 'article'
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    title = db.Column(db.String(100),nullable=True)
+    tags = db.relationship('Tag', secondary=article_tag, backref=db.backref('articles'))
+
+class Tag(db.Model):
+    __tablename__ = 'tag'
+    id = db.Column(db.Integer, primary_key=True , autoincrement=True)
+    name = db.Column(db.String(50), nullable=True)
+
+
+
+
+db.create_all()
+
+@app.route('/')
+def hello_world():
+
+    # article1 = Article(title = 'aaa')
+    # article2 = Article(title = 'bbb')
+    #
+    # tag1 = Tag(name='111')
+    # tag2 = Tag(name='222')
+    #
+    # article1.tags.append(tag1)
+    # article1.tags.append(tag2)
+    #
+    # article2.tags.append(tag1)
+    # article2.tags.append(tag2)
+    #
+    #
+    # db.session.add(article1)
+    # db.session.add(article2)
+    # db.session.add(tag1)
+    # db.session.add(tag2)
+    # db.session.commit()
+
+    article1 = Article.query.filter(Article.title=='aaa').first()
+    tags = article1.tags
+    for tag in tags:
+        print(tag.name)
+
+    return 'Hello_World'
+
+
+if __name__ == '__main__':
+    app.run(debug=True)

db_demo4/__pycache__/config.cpython-36.pyc

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+from flask_script import Manager

db_demo4/config.py

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+# encoding: utf-8
+from flask import Flask, render_template
+
+app = Flask(__name__)
+
+
+
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+if __name__ == '__main__':
+    app.run(debug=True)

db_demo4/db_demo4.py

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+# encoding: utf-8
+from flask import Flask, render_template
+
+app = Flask(__name__)
+
+@app.route('/')
+def index():
+    comments = [
+        {
+            'user': 'Zac',
+            'content': '119'
+        },
+        {
+            'user': 'Cecelia',
+            'content': '829'
+        }
+    ]
+    return render_template('index.html', comments=comments)
+
+
+if __name__ == '__main__':
+    app.run(debug=True)

db_demo4/manage.py

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+# encoding: utf-8
+from flask import Flask, render_template
+
+app = Flask(__name__)
+
+
+#for遍历字典
+
+@app.route('/')
+def index():
+    user = {
+        'username': 'Zac',
+        'age': 20
+    }
+    return render_template('index.html', user = user)
+
+if __name__ == '__main__':
+    app.run(debug=True)

extends_block.py

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+from flask import Flask, g, render_template, request
+from utils import login_log
+app = Flask(__name__)
+
+
+@app.route('/')
+def hello_world():
+    return 'Hello World!'
+
+@app.route('/login/', methods=['GET', 'POST'])
+def login():
+    if request.method == 'GET':
+        return render_template('login.html')
+    else:
+        username = request.form.get('username')
+        password = request.form.get('password')
+        if username == 'Zac' and password == '1234':
+            g.username = 'Zac'
+            login_log()
+            return '登录成功！'
+        else:
+            return '帐号密码错误!'
+
+if __name__ == '__main__':
+    app.run(debug=True)
+login_log()

filter_demo.py

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Title</title>
+</head>
+<body>
+<form action="" method="post">
+    <table>
+        <tbody>
+            <tr>
+                <td>用户名：</td>
+                <td><input type="text" name="username"></td>
+            </tr>
+            <tr>
+                <td>密码：</td>
+                <td><input type="password" name="password"></td>
+            </tr>
+            <tr>
+                <td></td>
+                <td><input type="submit" value="登录"></td>
+            </tr>
+        </tbody>
+    </table>
+</form>
+</body>
+</html>

for_statement.py

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+from flask import g
+
+def login_log():
+    print('当前登录用户为: %s' % g.username)

g_demo/__pycache__/utils.cpython-36.pyc

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+from flask import Flask, render_template, request
+
+app = Flask(__name__)
+
+
+@app.route('/')
+def hello_world():
+    return render_template('index.html')
+
+@app.route('/search/')
+def search():
+    print(request.args)
+    return 'search'
+
+@app.route('/login/', methods=['GET', 'POST'])
+def login():
+    if request.method == 'GET':
+        return render_template('login.html')
+    else:
+        username = request.form.get('username')
+        password = request.form.get('password')
+        print(username, password)
+        return 'post request'
+if __name__ == '__main__':
+    app.run(debug=True)

g_demo/g_demo.py

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Title</title>
+</head>
+<body>
+<a href="{{ url_for('search', q='hello') }}">跳转到搜索页面</a>
+</body>
+</html>

g_demo/templates/login.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Title</title>
+</head>
+<body>
+<form action="{{ url_for('login') }}" method="post">
+    <table>
+        <tr>
+            <td>用户名：</td>
+            <td><input type="text" placeholder="请输入用户名" name="username"></td>
+        </tr>
+        <tr>
+            <td>密码：</td>
+            <td><input type="text" placeholder="请输入密码" name="password"></td>
+        </tr>
+        <tr>
+            <td></td>
+            <td><input type="submit" value="登录"></td>
+        </tr>
+    </table>
+
+</form>
+</body>
+</html>