项目演示

项目本身很简单，增删改查是几乎所有系统的骨架。正所谓万丈高楼平地起，学会了增删改查，航母就指日可待了：），光速入门，直接看演示图：

项目地址

https://github.com/mudfish/python-flask-user-crud

Flask框架介绍

说白了就是一个Web框架，能够让你快速开发出Python web应用。简单易用，大家直接看官网就行：
https://flask.palletsprojects.com/en/3.0.x/quickstart/

开发步骤

开发工具

懒得折腾Pycharm了，直接Vscode安装pyhon和flask插件即可，也是比较丝滑的。

准备静态文件

主要用了Bootstrap5和Jquery这两个前端框架，一个是UI，一个是js。
都放到static文件夹下面：

开发入口文件

这个就是flask运行的文件，里面包括了启动入口，端口号和业务逻辑接口。

from flask import Flask, render_template, request, redirect, url_for, flash
import pymysql.cursors



# Connect to the database
connection = pymysql.connect(host='localhost',
                             user='root',
                             password='123456',
                             db='user_test',
                             charset='utf8mb4',
                             cursorclass=pymysql.cursors.DictCursor)
    
app = Flask(__name__)

# 保持数据库连接
def getconnection():
    connection.ping(reconnect=True)
    return connection
    
# 首页
@app.route('/')
def index():
    try:
        with getconnection().cursor() as cursor:
            sql = "SELECT * FROM `tb_user`"
            cols = ['id', 'name', 'age','gender','phone']
            cursor.execute(sql)
            result = cursor.fetchall()
            cursor.close()
            return render_template("index.html", items=result, cols=cols, success='')
    except Exception as e:
        cursor.close()
        return render_template("index.html", items=[], cols=[], success='Can\'t view index: ' + str(e))
    
# 搜索
@app.route('/search')
def search():
    keyword = request.args.get('keyword').strip()
    try:
        with getconnection().cursor() as cursor:
            sql = "SELECT * FROM `tb_user` where name like concat('%%',%s,'%%')"
            cols = ['id', 'name', 'age','gender','phone']
            cursor.execute(sql,(keyword))
            result = cursor.fetchall()
            # print(result)
            cursor.close()
            return render_template("index.html", items=result, keyword=keyword, cols=cols, success='')
    except Exception as e:
        cursor.close()
        return render_template("index.html", items=[], cols=[], success='search error: ' + str(e))


@app.route('/toAddPage')
def toAddPage():
 return render_template('add.html')

@app.route('/toEditPage/<int:id>')
def toEditPage(id):
    # print(id)
    try:
        with getconnection().cursor() as cursor:
            sql = "select * from `tb_user` where id=%s"
            cursor.execute(sql, (id))
            result = cursor.fetchone()
            cursor.close()
            return render_template("edit.html", item=result, success='')
    except Exception as e:
        cursor.close()
        return render_template("edit.html", success='Can\'t edit User: ' + str(e))

@app.route('/add', methods=['POST'])
def add():
    name = request.form['name'].strip()
    age = request.form['age'].strip()
    gender = request.form['gender'].strip()
    phone = request.form['phone'].strip()
    try:
        with getconnection().cursor() as cursor:
            sql = "INSERT INTO `tb_user` (`name`, `age`,`gender`,`phone`) VALUES (%s, %s,%s,%s)"
            cursor.execute(sql, (name, age,gender,phone))
            cursor.close()
            return redirect(url_for("index"))
    except Exception as e:
        cursor.close()
        return render_template("add.html", success='Can\'t add User: ' + str(e))

@app.route('/edit',methods=['POST'])
def edit():
    id = request.form['id'].strip()
    name = request.form['name'].strip()
    age = request.form['age'].strip()
    phone = request.form['phone'].strip()
    gender = request.form['gender'].strip()
    try:
        with getconnection().cursor() as cursor:
            sql = "update `tb_user` set name=%s,age=%s,gender=%s,phone=%s where id=%s"
            cursor.execute(sql, (name, age,gender,phone,id))
            cursor.close()
            return redirect(url_for("index"))
    except Exception as e:
        cursor.close()
        return render_template("edit.html", success='Can\'t edit User: ' + str(e))

@app.route('/remove/<int:id>/')
def remove(id):
    try:
        with getconnection().cursor() as cursor:
            sql = "delete from `tb_user` where id=%s"
            cursor.execute(sql, (id))
            cursor.close()
            return redirect(url_for("index"))
    except Exception as e:
        cursor.close()
        return render_template("index.html", success='Can\'t remove User: ' + str(e))

@app.errorhandler(404)
def page_not_found(error):
    return render_template('page_not_found.html'), 404

@app.errorhandler(500)
def system_error(error):
    return render_template('500.html'), 500

if __name__ == '__main__':
    # 静态文件缓存自动刷新
    app.jinja_env.auto_reload = True
    app.run(host='127.0.0.1',port=8001, debug=True)

开发html文件

后端接口有了，接下来就是web端发起调用，完成增删改查交互操作了。
此处flask提供了简单易用的渲染语法，请看：

首页

<!DOCTYPE html>
<html lang="en">
   <head>
       <meta charset="UTF-8">
       <meta name="viewport" content="width=device-width, initial-scale=1.0">
       <link href="{{ url_for('static', filename = 'css/bootstrap.min.css') }}"
           rel="stylesheet">
       <title>首页</title>
   </head>
   <body>
       <div class="container">
           <div class="row justify-content-center align-items-center g-1">
               <div class="col-6 pt-5">
                   <!-- search -->
                   <form action="/search" method="get">
                       <div class="input-group mb-3">
                           <input type="text" class="form-control" placeholder
                               aria-label="Example text with button addon"
                               aria-describedby="button-addon1" name="keyword" {% if keyword%} value="{{keyword}}" {% endif %}>
                           <button class="btn btn-primary" type="submit"
                               id="button-addon1">查询</button>
                               <a class="btn btn-warning " href="/toAddPage">新增</a>
                       </div>
                   </form>

                   

                   <div
                       class="table-responsive">
                       <table
                           class="table table-primary">
                           <thead>
                               <tr>
                                   <th scope="col">ID</th>
                                   <th scope="col">姓名</th>
                                   <th scope="col">性别</th>
                                   <th scope="col">年龄</th>
                                   <th scope="col">联系方式</th>
                                   <th scope="col">操作</th>
                               </tr>
                           </thead>
                           <tbody>
                               {% for item in items %}
                               <tr>
                                   {% for col in cols %}
                                   <td>{{ item[col] }}</td>
                                   {% endfor %}
                                   <!-- 补操作列 -->
                                   <td>
                                       <a class="btn btn-sm btn-primary"
                                           href="{{url_for('toEditPage',id=item['id'])}}">编辑</a>
                                       <a class="btn btn-sm btn-danger"
                                           href="{{url_for('remove',id=item['id'])}}"
                                           onclick="return confirm('确定删除吗');" >删除</a>
                                   </td>
                               </tr>
                               {% endfor %}

                           </tbody>
                       </table>
                       <div class="bg-warning  ">{{success}}</div>

                   </div>
               </div>
           </div>
       </div>

       <script
           src="{{url_for('static',filename='js/jquery.min.js')}}"></script>

   </body>
</html>

新增页面

<!DOCTYPE html>
<html lang="en">
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>新增用户</title>
   <link href="{{ url_for('static', filename = 'css/bootstrap.min.css') }}"
     rel="stylesheet">
 </head>
 <body>
   <div class="container">
     <div class="row justify-content-center align-items-center g-1">
       <div class="col-6 pt-5">
         <div class="card">
           <div class="card-header">
             新增用户
           </div>
           <div class="card-body">

             <form action="/add" method="post">
               <div class="row mb-3">
                 <label for="colFormLabelSm"
                   class="col-sm-2 col-form-label col-form-label">姓名</label>
                 <div class="col-sm-10">
                   <input type="text" class="form-control form-control-sm"
                     id="colFormLabelSm" name="name" required>
                 </div>
               </div>
               <div class="row mb-3">
                 <label for="age" class="col-sm-2 col-form-label">年龄</label>
                 <div class="col-sm-10">
                   <input type="text" class="form-control" id="age" name="age"
                     required>
                 </div>
               </div>
               <div class="row mb-3">
                 <label for="inlineRadio1"
                   class="col-sm-2 col-form-label">性别</label>
                 <div class="col-3">
                   <input class="form-check-input" type="radio" name="gender"
                     id="gender01" value="男">
                   <label class="form-check-label" for="inlineRadio1">男</label>
                 </div>
                 <div class="col-2">
                   <input class="form-check-input" type="radio" name="gender"
                     id="gender02" value="女">
                   <label class="form-check-label" for="inlineRadio2">女</label>
                 </div>
               </div>
               <div class="row mb-3">
                 <label for="phone"
                   class="col-sm-2 col-form-label">联系电话</label>
                 <div class="col-sm-10">
                   <input type="text" class="form-control" id="phone"
                     name="phone" required>
                 </div>
               </div>
               <div
                 class="row mb-3 justify-content-center align-items-center ">
                 <div class="col-6">
                   <a type="button" class="btn btn-secondary " href="/">
                     取消
                   </a>
                   <button type="submit" class="btn btn-primary ">
                     保存
                   </button>
                 </div>

               </div>
             </form>

           </div>

           <div class="bg-warning  ">{{success}}</div>
         </div>
       </div>

     </div>
   </div>
 </body>
</html>

编辑页面

<!DOCTYPE html>
<html lang="en">
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>修改用户</title>
   <link href="{{ url_for('static', filename = 'css/bootstrap.min.css') }}"
     rel="stylesheet">
 </head>
 <body>
   <div class="container">
     <div class="row justify-content-center align-items-center g-1">
       <div class="col-6 pt-5">
         <div class="card">
           <div class="card-header">
             新增用户
           </div>
           <div class="card-body">
             <form action="/edit" method="post">
               {% if item %}
               <input type="hidden" name="id" value="{{item.id}}">
               <div class="row mb-3">
                 <!-- {{item}} -->
                 <label for="colFormLabelSm"
                   class="col-sm-2 col-form-label col-form-label">姓名</label>
                 <div class="col-sm-10">
                   <input type="text" class="form-control form-control-sm"
                     id="colFormLabelSm" name="name" value="{{item.name}}"
                     required>
                 </div>
               </div>
               <div class="row mb-3">
                 <label for="age" class="col-sm-2 col-form-label">年龄</label>
                 <div class="col-sm-10">
                   <input type="text" class="form-control" id="age" name="age"
                     value="{{item.age}}" required>
                 </div>
               </div>
               <div class="row mb-3">
                 <label for="gender" class="col-sm-2 col-form-label">性别</label>
                 <div class="col-3">
                   <input class="form-check-input" type="radio" name="gender"
                     id="gender01" value="男" {% if item.gender=="男" %} checked
                     {% endif %}>
                   <label class="form-check-label" for="gender01">男</label>
                 </div>
                 <div class="col-2">
                   <input class="form-check-input" type="radio" name="gender"
                     id="gender02" value="女" {% if item.gender=="女" %} checked
                     {% endif %}>
                   <label class="form-check-label" for="gender02">女</label>
                 </div>
               </div>
               <div class="row mb-3">
                 <label for="phone"
                   class="col-sm-2 col-form-label">联系电话</label>
                 <div class="col-sm-10">
                   <input type="text" class="form-control" id="phone"
                     name="phone" value="{{item.phone}}" required>
                 </div>
               </div>
               <div
                 class="row mb-3 justify-content-center align-items-center ">
                 <div class="col-6">
                   <a type="button" class="btn btn-secondary  " href="/">
                     取消
                   </a>
                   <button type="submit" class="btn btn-primary ">
                     保存
                   </button>
                 </div>
               </div>
               {% endif %}
             </form>
           </div>
         </div>
         <div class="bg-warning  ">{{success}}</div>
       </div>
     </div>
   </div>
 </body>
</html>

收工

看完觉着有帮助的朋友，一键三连哈~~