How to display all MySQL databases

How to display all MySQL database

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database It can be regarded as a container for storing data objects , Each database has a unique name , And the name of the database is meaningful , In this way, you can clearly see what data each database is used to store . stay MySQL There are system database and user-defined database in the database , The system database is installed MySQL After the system comes with the database , A custom database is a database created by user definition .

Show MySQL database

obtain MySQL The most common way to list databases is to use mysql The client connects to MySQL The server And run SHOW DATABASES command .

Use the following command to access MySQL The server , And enter your... When prompted MySQL User password ：

mysql -u user -p

*

If you have not yet done so for MySQL User set password , You can omit this -p switch .

stay MySQL shell Execute the following command in ：

SHOW DATABASES;

This command will print a list of all databases for which the user has permissions . The output will be similar to ：

+--------------------+
| Database           |
+--------------------+
| information_schema |
| opencart           |
+--------------------+
2 rows in set (0.00 sec)

SHOW SCHEMAS Is another command that can be used to list databases , It is SHOW DATABASES Synonyms for commands ：

SHOW SCHEMAS;

Output and use SHOW DATABASES The output of the command is the same ：

+--------------------+
| Database           |
+--------------------+
| information_schema |
| opencart           |
+--------------------+
2 rows in set (0.00 sec)

Show all MySQL database

To list MySQL All databases on the server , You need to log in as a user who has access to all databases , By default root The user has the permission to view all databases . Able to use SHOW DATABASES List all databases .

Use root The user login MySQL：

mysql -u root -p

function SHOW DATABASES command ：

SHOW DATABASES;

You will see MySQL List of all databases on the server ：

How to be in MySQL Show all databases in ? How to be in MySQL Show all databases in ?

+--------------------+
|     Databases      |
+--------------------+
| information_schema |
| database_name      |
| mysql              |
| opencart           |
| wordpress          |
| performance_schema |
| sys                |
+--------------------+

7 rows in set (0.00 sec)

Filter results

If the output of the command is filtered according to a specific mode , Please run SHOW DATABASES When you use LIKE Clause .

SHOW DATABASES LIKE pattern;

for example , The following statement returns the name with “open” All the databases at the beginning ：

SHOW DATABASES LIKE 'open%';
+--------------------+
| Database           |
+--------------------+
| opencart           |
+--------------------+
1 rows in set (0.00 sec)

*

Percent sign (%) Represents zero , One or more characters .

If you want to do a more complex search , It can be downloaded from information_schema In the database schemata Query in the table according to conditions .

The following statement will provide you with the “open” or “word” List of all databases at the beginning ：

SELECT schema_name
FROM information_schema.schemata
WHERE schema_name LIKE 'open%' OR
schema_name LIKE 'word%';
+--------------------+
| Database           |
+--------------------+
| opencart           |
| wordpress          |
+--------------------+
2 rows in set (0.00 sec)

Display... From the command line MySQL database

To log in without MySQL shell To get the database list , You can use mysql The order carries -e Options ( representative execute), You can also use mysqlshow Commands to display database and table information .

When you want to use shell Script use MySQL Database time , This is especially useful .

Run the following command on the terminal to display a list of all databases ：

mysql -u user -p -e 'show databases;'+--------------------+
| Database           |
+--------------------+
| information_schema |
| opencart           |
+--------------------+

Here's how to use the mysqlshow Examples of commands ：

mysqlshow -u user -p

The output will be the same as in the previous command .

If you want to filter the output , have access to grep command .

Read here , This article “ How to display all MySQL database ” The article has been introduced , If you want to master the knowledge points of this article, you need to practice and use it yourself to understand , If you want to know more about this article , Welcome to the Yisu cloud industry information channel .