python中MySQLdb连接数据怎么用

这篇文章主要介绍了python中MySQLdb连接数据怎么用，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

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 MySQLdbfrom flask_wtf import FlaskFormfrom wtforms.validators import DataRequired,EqualTo,Lengthfrom wtforms import StringField,SubmitField,PasswordField,TelFieldfrom flask import Flask,render_template,redirect,url_for,abort,request,jsonifyapp=Flask(__name__)app.secret_key='stu'#连接数据mysqlconn=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

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Title</title>    <style>        .h2{            position:relative;            margin:auto;            width:500px;            height:50px;            margin-top:100px;            margin-left:650px;        }        .form {            position:relative;            width:500px;            height:50px;            margin:auto;            margin-top:50px;            border:2px solid #000000;            color:#000000;            font-size:20px;            font-weight:400;        }        .form1{            position:absolute;            margin-top:10px;            margin-left:80px;        }        .form2{            position:absolute;            margin-top:10px;            margin-left:180px;        }        .form3{            position:absolute;            margin-top:10px;            margin-left:280px;        }        .form4{            position:absolute;            margin-top:10px;            margin-left:380px;        }    </style></head><body>    <div class="h2">        <h2>功能选择</h2>    </div>    <div class="form">        <form class="form1" action="http://127.0.0.1:5000/add" method="POST">            <input type="submit" name="submit1" value="添加">        </form>        <form class="form2" action="http://127.0.0.1:5000/search" method="POST">            <input type="submit" name="submit2" value="搜索">        </form>        <form class="form3" action="http://127.0.0.1:5000/update" method="POST">            <input type="submit" name="submit3" value="更新">        </form>        <form class="form4" action="http://127.0.0.1:5000/delete" method="POST">            <input type="submit" name="submit4" value="删除">        </form>    </div></body></html>

5.update.html文件

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Insert</title>    <style>        div{          width:255px;          height:100px;          margin:auto;          margin-top:200px;          border:2px solid #000000;          font-size:20px;          font-weight:400px;          background:#FFFFFF;        }        .submit{            margin-top:10px;            margin-left:100px;        }    </style></head><body>  <div>      <form action="" method="POST">          {{ustuform.csrf_token()}}          {{ustuform.name.label}}{{ustuform.name}}<br>          {{ustuform.password.label}}{{ustuform.password}}<br>          <input class="submit" type="submit" name="submit" value="更新">      </form>  </div></body></html>

6.delete.html文件

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Insert</title>    <style>        div{          width:255px;          height:100px;          margin:auto;          margin-top:200px;          border:2px solid #000000;          font-size:20px;          font-weight:400px;          background:#FFFFFF;        }        .submit{            margin-top:10px;            margin-left:100px;        }    </style></head><body>  <div>      <form action="" method="POST">          {{dstuform.csrf_token()}}          {{dstuform.name.label}}{{dstuform.name}}<br>          <input class="submit" type="submit" name="submit" value="删除">      </form>  </div></body></html>

7.search.html文件

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Insert</title>    <style>        div{          width:255px;          height:100px;          margin:auto;          margin-top:200px;          border:2px solid #000000;          font-size:20px;          font-weight:400px;          background:#FFFFFF;        }        .submit{            margin-top:10px;            margin-left:100px;        }    </style></head><body>  <div>      <form action="" method="POST">          {{sstuform.csrf_token()}}          {{sstuform.name.label}}{{sstuform.name}}<br>          <input class="submit" type="submit" name="submit" value="搜索">      </form>  </div></body></html>

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