sqlalchemy.exc.OperationalError：（MySQLdb._exceptions.OperationalError）（1045，“用户'root'@'localhost'的访问被拒绝（使用密码：NO）”）

Question

So i am trying to build a simple blog website where i am using Flask and flask_sqlalchemy. Here i am trying to add the information ( Name,email id etc) UI part and then on button click , it will save to localhost/phpMyadmin.

Here it is Main.py file

from flask import Flask , render_template ,redirect, url_for, request
from flask_sqlalchemy import SQLAlchemy


app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:@localhost/PersonalBlog'

# initialize
db = SQLAlchemy(app)

# To Db
class PostTable(db.Model):
    sno = db.Column(db.Integer, primary_key=True, unique=True, nullable=False)
    date = db.Column(db.DATE, primary_key=False)
    name = db.Column(db.String(120), unique=False, nullable=False)
    emailid = db.Column(db.String(50), unique=False, nullable=False)
    phone = db.Column(db.String(15), unique=False, nullable=False)
    message = db.Column(db.String(120), unique=False, nullable=False)

@app.route("/")
def home():
    return render_template('index.html')

@app.route("/homeclick")
def homeclick():
    return render_template('index.html')

@app.route("/about")
def about():
    return render_template('about.html')

@app.route("/post")
def post():
    return render_template('post.html')

@app.route("/contact" , methods=['POST', 'GET'])
def contact():
    if request.method == 'POST' :
        # add entry to the database

        name = request.form.get('name')
        emailid = request.form.get('email')
        phone = request.form.get('phone_number')
        message = request.form.get('message')

        entry_to_db = PostTable(name=name, emailid=emailid , phone=phone, message=message)
        db.session.add(entry_to_db)
        db.session.commit()
    return render_template('contact.html')

if __name__ == '__main__':
    app.run(debug=True, port=4013 , threaded=True)

The following error is getting displayed when i click on Submit button after giving details.

sqlalchemy.exc.OperationalError sqlalchemy.exc.OperationalError: (MySQLdb._exceptions.OperationalError) (1045, "Access denied for user 'root'@'localhost' (using password: NO)") (Background on this error at: http://sqlalche.me/e/14/e3q8 )

Full Traceback Details if it helps

File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 3211, in _wrap_pool_connect return fn() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 307, in connect return _ConnectionFairy._checkout(self) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 767, in _checkout fairy = _ConnectionRecord.checkout(pool) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 425, in checkout rec = pool._do_get() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/impl.py", line 146, in do_get self. dec_overflow() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/langhelpers.py", line 70, in exit compat.raise ( File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 207, in raise raise exception File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/impl.py", line 143, in _do_get return self._create_connection() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 253, in _create_connection return _ConnectionRecord(self) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 368, in init self.__connect() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 611, in connect pool.logger.debug("Error on connect(): %s", e) File "/User s/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/langhelpers.py", line 70, in exit compat.raise ( File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 207, in raise raise exception File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 605, in __connect connection = pool._invoke_creator(self) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/create.py", line 578, in connect return dialect.connect(*cargs, **cparams) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/default.py", line 584, in connect return self.dbapi.connect(*cargs, **cparams) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/MySQLdb/ init .py", line 130, in Connect return Connection(*args, **kwargs) File " /Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/MySQLdb/connections.py", line 185, in init super(). init (*args, **kwargs2) The above exception was the direct cause of the following exception: File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/flask/app.py", line 2088, in call return self.wsgi_app(environ, start_response) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/flask/app.py", line 2073, in wsgi_app response = self.handle_exception(e) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/flask/app.py", line 2070, in wsgi_app response = self.full_dispatch_request() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/flask/app.py", line 1515, in full_dispatch_request rv = self.handle_user_exception(e) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/flask/app.py", line 1513, in full_dispatch_request rv = self.dispatch_request() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/s ite-packages/flask/app.py", line 1499, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args) File "/Users/ranjankumar/Desktop/Folders/Project Flask/main.py", line 48, in contact db.session.commit() File "", line 2, in commit

File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 1428, in commit self._transaction.commit(_to_root=self.future) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 829, in commit self._prepare_impl() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 808, in _prepare_impl self.session.flush() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 3298, in flush self._flush(objects) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 3438, in flush transaction.rollback( capture_exception=True) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/langhelpers.py", line 70, in exit compat.raise ( File "/Us ers/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 207, in raise raise exception File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 3398, in _flush flush_context.execute() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/unitofwork.py", line 456, in execute rec.execute(self) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/unitofwork.py", line 630, in execute util.preloaded.orm_persistence.save_obj( File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/persistence.py", line 209, in save_obj for ( File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/persistence.py", line 370, in organize_states_for_save for state, dict , mapper, connection in _connections_for_s tates( File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/persistence.py", line 1709, in _connections_for_states connection = uowtransaction.transaction.connection(base_mapper) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 626, in connection return self._connection_for_bind(bind, execution_options) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 735, in _connection_for_bind conn = self._parent._connection_for_bind(bind, execution_options) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/orm/session.py", line 747, in _connection_for_bind conn = bind.connect() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 3165, in connect return self._connection_cls(self, close_with_result= close_with_result) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 96, in init else engine.raw_connection() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 3244, in raw_connection return self._wrap_pool_connect(self.pool.connect, _connection) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 3214, in _wrap_pool_connect Connection. handle_dbapi_exception_noconnection( File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 2068, in handle_dbapi_exception_noconnection util.raise ( File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 207, in raise raise exception File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/base.py", line 3211, in _wrap_pool_connect return fn() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 307, in connect return _ConnectionFairy._checkout(self) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 767, in _checkout fairy = _ConnectionRecord.checkout(pool) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 425, i n checkout rec = pool._do_get() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/impl.py", line 146, in do_get self. dec_overflow() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/langhelpers.py", line 70, in exit compat.raise ( File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 207, in raise raise exception File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/impl.py", line 143, in _do_get return self._create_connection() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 253, in _create_connection return _ConnectionRecord(self) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 368, in init self.__connect() File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 611, in connect pool.logger.debug("Error on connect(): %s", e) File "/User s/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/langhelpers.py", line 70, in exit compat.raise ( File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/util/compat.py", line 207, in raise raise exception File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/pool/base.py", line 605, in __connect connection = pool._invoke_creator(self) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/create.py", line 578, in connect return dialect.connect(*cargs, **cparams) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/sqlalchemy/engine/default.py", line 584, in connect return self.dbapi.connect(*cargs, **cparams) File "/Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/MySQLdb/ init .py", line 130, in Connect return Connection(*args, **kwargs) File " /Users/ranjankumar/Desktop/Folders/Project Flask/env/lib/python3.8/site-packages/MySQLdb/connections.py", line 185, in init super(). init (*args, **kwargs2) sqlalchemy.exc.OperationalError: (MySQLdb._exceptions.OperationalError) (1045, "Access denied for user 'root'@'localhost' (using password: NO)") (Background on this error at: http://sqlalche.me/e/14/e3q8 ) The debugger caught an exception in your WSGI application. 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Answer 1

Your connection string is not using a passoword, mysql://root:<PASSWORD>@localhost/PersonalBlog

You should try to login to your DB without password using root as user and see what happens.

You can try adding a new user with password which has full (or not) access to that DB, so you just change the user root in your case and <PASSWORD> to the new ones. You can also try changing/setting a password to the root user.