Before starting the article, post a command:
root@764df9acf820:/# mysql -uroot -p
I believe that most people use it this way, and I guess that most people (the rookie me) will have a lot of questions. For example: Should there be spaces between -uroot, and what is the difference between -h and --host... Next, let's start to understand with these questions.
1. First, we understand the rules of command line parameters
- The options are given after the command name.
- The option parameter starts with a dash or two dashes, which are two forms of short format and long format. Such as -h and --host.
- Option names are case sensitive. -v and -V are both legal and have different meanings. (They are the corresponding abbreviations for the –verbose and –version options.)
- There are differences in the short format and long format followed by the parameter format.
Examples of long and short format rules are as follows:
- The long format must start with a double dash and the parameter name is QuanPin. For example, --host=localhost is connected with = and there can be no spaces between the parameter values.
- The short format must start with a single dash and the parameter name must be abbreviated. For example, the space between -h localhost is optional.
Exception: There can be no spaces between the parameters -p and --possword= for specifying the password and the password. Of course, it is recommended that the password be entered after pressing Enter. If there is a parameter in the middle, the meaning is the same as -D, and the password after the space will be regarded as the specified database.
As shown in the figure below: Go directly to the specified library.
root@764df9acf820:/# mysql -uroot -p book
Enter password:
mysql> show tables;
+------------------------+
| Tables_in_book |
+------------------------+
| admin_menu |
Second, the command options for establishing a connection
| Options | Comment | For example |
|---|---|---|
| –user / -u | Specify username | -u root |
| –host / -h | Specify the host address | -h local |
| –password / -p | Specify the connection password | -ppwd |
| –port / -P | Specify host port | -P 3306 |
| –protocol | Specify the transfer protocol | –protocol={TCP、SOCKET、PIPE、MEMORY} |
| –socket / -S | Specify Unix socket file | -S /tmp/mysql.sock |
Usually, it is enough to master the above parameters in general use. Then we began to look at the next chapter, learn some input standby mode .