MySQL是如何创建并选择数据库的
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3.3.1 Creating and Selecting a Database
3.3.1 创建 选择数据库
If the administrator creates your database for you when setting up your permissions, you can begin using it. Otherwise, you need to create it yourself:
如果管理员为你创建数据库并 为你设置了权限，你可以使用它。否则，您需要自己创建数据库：
mysql> CREATE DATABASE menagerie;
Under Unix, database names are case sensitive (unlike SQL keywords), so you must always refer to your database as menagerie, not as Menagerie, MENAGERIE, or some other variant. This is also true for table names. (Under Windows, this restriction does not apply, although you must refer to databases and tables using the same lettercase throughout a given query. However, for a variety of reasons, the recommended best practice is always to use the same lettercase that was used when the database was created.)
在Unix下，数据库名称是区分大小写的（不像SQL关键字），所以你必须总是指到你的数据库 menagerie，而不是 Menagerie，MENAGERIE或一些其他变种。表名也是如此。（windows 下，大小写不敏感，你最好使用与建表或者建库时相同的拼写。）
Note
If you get an error such as ERROR 1044 (42000): Access denied for user 'micah'@'localhost' to database 'menagerie' when attempting to create a database, this means that your user account does not have the necessary privileges to do so. Discuss this with the administrator or see Section 6.2, “The MySQL Access Privilege System”.
注意
如果您收到 ERROR 1044 (42000): Access denied for user 'micah'@'localhost' to database 'menagerie'，这意味着您的用户帐户没有锁必须的权限。请与管理员讨论，或参见第6.2节“MySQL访问特权系统”。
Creating a database does not select it for use; you must do that explicitly. To make menagerie the current database, use this statement:
创建数据库并没有选择使用它，你必须特别的指定，让menagerie成为现在使用的数据库，使用以下语句：
mysql> USE menagerie Database changed
Your database needs to be created only once, but you must select it for use each time you begin a mysql session. You can do this by issuing a USE statement as shown in the example. Alternatively, you can select the database on the command line when you invoke mysql. Just specify its name after any connection parameters that you might need to provide. For example:
您的数据库只需要创建一次，但是每次开始mysql 会话时都必须选择它。您可以通过发出USE如示例中所示的语句来执行此操作 。或者，您可以在调用mysql时在命令行中选择数据库。只需在您可能需要提供的任何连接参数之后指定其名称。例如：
shell> mysql -h host -u user -p menagerie Enter password: ********
Important
menagerie in the command just shown is not your password. If you want to supply your password on the command line after the -p option, you must do so with no intervening space (for example, as -pmypassword, not as -p mypassword). However, putting your password on the command line is not recommended, because doing so exposes it to snooping by other users logged in on your machine.
重要
在刚刚的命令中 menagerie不是你的密码。如果要在-p选项之后的命令行中提供密码 ，你必须在-p选项后不插入空格马上输入（例如， -pmypassword 不是-p mypassword）。但是，不建议将密码放在命令行上，因为这样做会使其被登录到您的计算机上的其他用户窥探。
Note
You can see at any time which database is currently selected using SELECT DATABASE().
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