Login of MySQL [database system]

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 1. Stop and start of service

MySQL After installation , The server process needs to be started , Otherwise, the client cannot connect to the database .

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 --- Run as administrator windows Command prompt , Otherwise Access denied ：

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#  start-up MySQL The service command net start MySQL service name #  stop it MySQL The service command net stop MySQL service name 

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1.MySQL The service is in a stopped state ：

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2. start-up MySQL service ：

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 3.MySQL The service is in a started state ：

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 start and stop The following service name should be consistent with the service name specified when configuring environment variables .

2. Login and exit

Format ：

mysql -h  Host name  -P  Port number  -u  user name  -p password 

give an example ：

mysql -h localhost -P 3306 -u root -pabc123  #  Previously set root The user's password is abc123

Landing successful ：

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  There is a warning here , Just change the method of password input ：

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Exit command ：

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  Be careful ：

（1）-p There must be no space between and password , There may or may not be spaces between other parameter names and parameter values . Such as ：

mysql -hlocalhost -P3306 -uroot -pabc123

（2） It is recommended to enter the password on the next line , Keep it safe .

（3） The client and server are on the same machine , So the input localhost perhaps IP Address 127.0.0.1. meanwhile , Because it is connected to this machine ： -hlocalhost You can omit , If the port number has not been modified ：-P3306 You can omit it .

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Before landing Can pass ：

mysql -V

perhaps

mysql --version

  Way to obtain MySQL Server Service version information .

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After landing adopt

select version();

View current version information .