Rechercher dans le manuel MySQL
3.3 Creating and Using a Database
[+/-]
Once you know how to enter SQL statements, you are ready to access a database.
Suppose that you have several pets in your home (your menagerie) and you would like to keep track of various types of information about them. You can do so by creating tables to hold your data and loading them with the desired information. Then you can answer different sorts of questions about your animals by retrieving data from the tables. This section shows you how to perform the following operations:
Create a database
Create a table
Load data into the table
Retrieve data from the table in various ways
Use multiple tables
The menagerie database is simple (deliberately), but it is not difficult to think of real-world situations in which a similar type of database might be used. For example, a database like this could be used by a farmer to keep track of livestock, or by a veterinarian to keep track of patient records. A menagerie distribution containing some of the queries and sample data used in the following sections can be obtained from the MySQL website. It is available in both compressed tar file and Zip formats at https://dev.mysql.com/doc/.
Use the SHOW
statement to find out
what databases currently exist on the server:
- +----------+
- +----------+
- | mysql |
- | test |
- | tmp |
- +----------+
The mysql
database describes user access
privileges. The test
database often is
available as a workspace for users to try things out.
The list of databases displayed by the statement may be different
on your machine; SHOW DATABASES
does not show databases that you have no privileges for if you do
not have the SHOW DATABASES
privilege. See Section 13.7.6.14, “SHOW DATABASES Syntax”.
If the test
database exists, try to access it:
USE
, like QUIT
,
does not require a semicolon. (You can terminate such statements
with a semicolon if you like; it does no harm.) The
USE
statement is special in another
way, too: it must be given on a single line.
You can use the test
database (if you have
access to it) for the examples that follow, but anything you
create in that database can be removed by anyone else with access
to it. For this reason, you should probably ask your MySQL
administrator for permission to use a database of your own.
Suppose that you want to call yours menagerie
.
The administrator needs to execute a statement like this:
where your_mysql_name
is the MySQL user name
assigned to you and your_client_host
is the
host from which you connect to the server.
Traduction non disponible
Le manuel MySQL n'est pas encore traduit en français sur l'infobrol. Seule la version anglaise est disponible pour l'instant.
Document créé le 26/06/2006, dernière modification le 26/10/2018
Source du document imprimé : https://www.gaudry.be/mysql-rf-database-use.html
L'infobrol est un site personnel dont le contenu n'engage que moi. Le texte est mis à disposition sous licence CreativeCommons(BY-NC-SA). Plus d'info sur les conditions d'utilisation et sur l'auteur.
Références
Ces références et liens indiquent des documents consultés lors de la rédaction de cette page, ou qui peuvent apporter un complément d'information, mais les auteurs de ces sources ne peuvent être tenus responsables du contenu de cette page.
L'auteur de ce site est seul responsable de la manière dont sont présentés ici les différents concepts, et des libertés qui sont prises avec les ouvrages de référence. N'oubliez pas que vous devez croiser les informations de sources multiples afin de diminuer les risques d'erreurs.