SQLAlchemy 操作sqlite3数据库

实例：

　　项目目录结构：

　　

　　代码：app.py

from flask import Flask,render_template,request,redirect
import sqlite3
import os

app = Flask(__name__)

# directory name:
BASE_DIR = os.path.dirname(__file__)


# 查询数据
@app.route('/')
def index():
    conn = sqlite3.connect(os.path.join(BASE_DIR, 'wxs.db'))
    cursor = conn.cursor()
    sql = "select id,title from blog"
    rows = cursor.execute(sql)
    blogs = []
    for row in rows:
        blog = {}
        # (1,'世界杯')
        id = row[0]
        title = row[1]
        blog['id'] = id
        blog['title'] = title
        blogs.append(blog)
    return render_template('index.html',blogs=blogs)


# 添加一条新数据
@app.route("/add_blog/",methods=['GET','POST'])
def add_blog():
    if request.method == 'GET':
        return render_template('add_blog.html')
    else:
        conn = sqlite3.connect(os.path.join(BASE_DIR,'wxs.db'))
        cursor = conn.cursor()
        title = request.form.get('title')
        content = request.form.get('content')
        sql = "insert into blog(id,title,content) values(null,'%s','%s')"%(title,content)
        cursor.execute(sql)
        conn.commit()
        conn.close()
        print("title:%s"%title)
        print("content:%s"%content)
        return redirect('/')


# 通过get请求，查询参数获取一条数据
@app.route("/blog_detail/")
def blog_detail():
　　# args 查询参数 ?id=内容
    blog_id = request.args.get("id")
    conn = sqlite3.connect(os.path.join(BASE_DIR, 'wxs.db'))
    cursor = conn.cursor()
    sql = "select id,title,content from blog where id=%s"%blog_id
    rows = cursor.execute(sql)
    blog = {}
    for row in rows:
        # row = (id,title,content)
        blog['id'] = row[0]
        blog['title'] = row[1]
        blog['content'] = row[2]
    return render_template('blog_detail.html',blog=blog)


if __name__ == '__main__':
    app.run()