python MySQLdb 连接数据的使用

目录

• 1.文件结构
• 2.实验效果
• 3.主文件：main.py
• 4.base.html文件
• 5.update.html文件
• 6.delete.html文件
• 7.search.html文件

1.文件结构

MySQLdb和pymysql的使用差不多阅读的小伙伴可以自己尝试实现

2.实验效果

3.主文件：main.py

import MySQLdb
from flask_wtf import FlaskForm
from wtforms.validators import DataRequired,EqualTo,Length
from wtforms import StringField,SubmitField,PasswordField,TelField
from flask import Flask,render_template,redirect,url_for,abort,request,jsonify

app=Flask(__name__)
app.secret_key='stu'

#连接数据mysql
conn=MySQLdb.connect(
    host='127.0.0.1',
    port=3306,
    user='root',
    password='root',
    db='main'
)
cur=conn.cursor()

#增加用户表单
class StuForm(FlaskForm):
    name=StringField(label='用户名: ',validators=[DataRequired()])
    password=PasswordField(label='密码: ',validators=[DataRequired(),Length(min=3,max=8)])
    submit=SubmitField(label='提交')

#搜索用户表单
class SStuForm(FlaskForm):
    name = StringField(label='用户名: ', validators=[DataRequired()])
    submit=SubmitField(label='提交')

#更新用户表单
class UStuForm(FlaskForm):
    name = StringField(label='用户名: ', validators=[DataRequired()])
    password = PasswordField(label='密码: ', validators=[DataRequired(), Length(min=3, max=8)])
    submit = SubmitField(label='提交')

#删除用户表单
class DStuForm(FlaskForm):
    name = StringField(label='用户名: ', validators=[DataRequired()])
    submit = SubmitField(label='提交')

def CreateTab():
    sql="create table student(name varchar(20),password varchar(30))"
    cur.execute(sql)
    conn.commit()
    cur.close()

@app.route('/add',methods=['POST','GET'])
def add():
    stuform=StuForm()
    if request.method=='POST':
        if stuform.validate_on_submit():
            name=stuform.name.data
            password=stuform.password.data
            print('name: {}'.format(name))
            print('password: {}'.format(password))
            sql=f"insert into student(name,password) values('{name}','{password}')"
            cur.execute(sql)
            conn.commit()
            return jsonify('Add Successed!')
    return render_template('add.html',stuform=stuform)

@app.route('/search',methods=['POST','GET'])
def search():
    sstuform=SStuForm()
    if request.method=='POST':
        if sstuform.validate_on_submit():
            name=sstuform.name.data
            sql=f"select count(name) from student where name='{name}'"
            cur.execute(sql)
            conn.commit()
            count=cur.fetchone()[0]
            if count<=0:
                return jsonify('The User is not exist!')
            else:
                sql=f"select name,password from student where name='{name}'"
                cur.execute(sql)
                conn.commit()
                result=cur.fetchall()
                return jsonify(result)
    return render_template('search.html',sstuform=sstuform)

@app.route('/update',methods=['POST','GET'])
def update():
    ustuform=UStuForm()
    if request.method=='POST':
        if ustuform.validate_on_submit():
            name = ustuform.name.data
            password=ustuform.password.data
            sql = f"select count(name) from student where name='{name}'"
            cur.execute(sql)
            conn.commit()
            count = cur.fetchone()[0]
            if count <= 0:
                return jsonify('The User is not exist!')
            else:
                sql = f"update student set name='{name}',password='{password}'  where name='{name}'"
                cur.execute(sql)
                conn.commit()
                return jsonify('Update Successed!')
    return render_template('update.html',ustuform=ustuform)
@app.route('/delete',methods=['POST','GET'])
def delete():
    dstuform=DStuForm()
    if request.method=='POST':
        if dstuform.validate_on_submit():
            name=dstuform.name.data
            sql = f"select count(name) from student where name='{name}'"
            cur.execute(sql)
            conn.commit()
            count = cur.fetchone()[0]
            if count <= 0:
                return jsonify('The User is not exist!')
            else:
                sql=f"delete from student where name='{name}'"
                cur.execute(sql)
                conn.commit()
                return jsonify('Delete Successed!')

    return render_template('delete.html',dstuform=dstuform)

@app.route('/function',methods=['POST','GET'])
def function():
    if request.method=='POST':
        submit1 = request.form.get('submit1')
        submit2 = request.form.get('submit2')
        submit3 = request.form.get('submit3')
        submit4 = request.form.get('submit4')
        print('submit1: {}'.format(submit1))
        print('submit2: {}'.format(submit2))
        print('submit3: {}'.format(submit3))
        print('submit4: {}'.format(submit4))
        if submit1 is not None:
            return redirect(url_for('add'))
        if submit2 is not None:
            return redirect(url_for('search'))
        if submit3 is not None:
            return redirect(url_for('update'))
        if submit4 is not None:
            return redirect(url_for('delete'))
    return render_template('base.html')
if __name__ == '__main__':
    print('Pycharm')
    # CreateTab()
    app.run(debug=True)

4.base.html文件

    
    
    


    

        
功能选择
    
    

        

            
        
        

            
        
        

            
        
        

            
        
    

5.update.html文件

    
    
    


  

      

          {{ustuform.csrf_token()}}
          {{ustuform.name.label}}{{ustuform.name}}

          {{ustuform.password.label}}{{ustuform.password}}

          
      
  

6.delete.html文件

    
    
    


  

      

          {{dstuform.csrf_token()}}
          {{dstuform.name.label}}{{dstuform.name}}

          
      
  

7.search.html文件

    
    
    


  

      

          {{sstuform.csrf_token()}}
          {{sstuform.name.label}}{{sstuform.name}}

          
      
  

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