MySQL Connection Error resolution

Situation One:

BUG: Error 1044 (42000): Access denied for user "@ ' localhost ' to database ' MySQL '

MySQL database in the user table, there is a username is empty account is anonymous account, resulting in the log in when the use of root, but the actual anonymous login, through the error message "@" localhost can be seen.

Workaround: Reference

1. Turn off MySQL
[[Email protected] ~]# service mysqld Stop
2. Blocking Permissions
[email protected] ~]# Mysqld_safe--skip-grant-table
screen appears: Starting demo from ... ..
3. Start a new terminal input
[[email protected] ~]# mysql-u root MySQL
mysql> Delete from user where user= ';
mysql> FLUSH privileges; Be sure to write, otherwise if you close the previous terminal, the original error will occur
mysql> \q

Situation Two:

I want to remove a table from MySQL by Flask_sqlalchemy, but Flask_sqlalchemy only Db.drop_all ()

Now find a way to use Flask_sqlalchemy and pymysql for remote operation

Use Pymysql directly to delete a table operation:

#-*-coding:utf-8-*-#!/usr/bin/env python#@Author: Tianbao#@Contact: [email protected]#@Time: 2018/5/13 9:55#@File: pymysql_del_preview.py#@Software: PycharmImportPymysqlconnect= Pymysql.connect (#connecting to the database serverUser="Root", Password="Root", host="205.266.87.91", Port=3306, DB="movie", CharSet="UTF8") Conn= Connect.cursor ()#Create an action cursorConn.execute ("SELECT * from user")#Select View your own user This table (to see the tables in your database first use XX and then view)rows = Conn.fetchall ()#Fetchall (): Receives all the returned result rows, if not, returns the number of contents of the table int type forIinchrows:Print(i) Conn.execute ("drop table Preview") Conn.close ()#closing a cursor connectionConnect.close ()#Close the database server connection to free up memory

　　Regenerated into the original table by Flask_sqlalchemy

#-*-coding:utf-8-*-#!/usr/bin/env python#@Author: Tianbao#@Contact: [email protected]#@Time: 2018/5/13 9:34#@File: flask_sqlalchemy_create_preview.py#@Software: Pycharm fromFlaskImportflask,render_template fromFlask_sqlalchemyImportSQLAlchemy fromDatetimeImportDatetimeapp= Flask (__name__) app.config['Sqlalchemy_database_uri'] ="Mysql+pymysql://root:[email Protected]:3306/movie"app.config['sqlalchemy_track_modifications'] =trueapp.config['Secret_key'] ="HelloWorld"DB=SQLAlchemy (APP)#Release NoticeclassPreview (db. Model):__tablename__='Preview'ID= db. Column (db. integer,primary_key=True) Title= db. Column (db. String (255), unique=True) Logo= db. Column (db. String (255), unique=true)#coverAddtime = db. Column (db. DateTime, Index=true, default=DateTime.Now)def __repr__(self):return '<preview%s>'%Self.titleif __name__=='__main__': Db.create_all ()#Db.drop_all ()    #role = Role (    #name= ' Super admin ',    #auths= "    # )    #From werkzeug.security import Generate_password_hash    #admin = admin (    #name= ' Imoocmovie1 ',    #pwd=generate_password_hash (' Imoocmovie1 '),    #is_super=0,    #roleid=1,    # )    #db.session.add (Admin)    #Db.session.commit ()    #Pass

MySQL Connection Error resolution