Warning: Using a password on the command line interface can be insecure. ERROR 1049 (42000): Unknown database 'databases”'

关于“Warning: Using a password on the command line interface can be insecure.”的问题，这是因为在命令行中使用密码是不安全的，因为密码可能会被记录在历史记录中，从而被其他人看到。为了避免这种情况，可以使用以下命令来避免警告：

mysql -u username -p

这将提示您输入密码，而不是在命令行中明文输入密码。

关于“ERROR 1049 (42000): Unknown database 'databases”'?”的问题，这是因为您尝试连接到一个不存在的数据库。请确保您输入的数据库名称正确，并且该数据库已经存在。如果不存在，请使用以下命令创建数据库：

CREATE DATABASE database_name;

请将“database_name”替换为您要创建的数据库的名称。

相关问题

mysql: [Warning] Using a password on the command line interface can be insecure. ERROR 1049 (42000): Unknown database 'parking_guidance'

The warning message you're seeing is a standard security concern when using MySQL through a command-line interface, such as `mysql` or `mysqladmin`. It's advising that providing a password directly on the command line can be less secure because anyone monitoring your terminal session could potentially see it. For better protection, it's recommended to use tools like `mysql_secure_installation` or configuration files with hashed passwords.

The error message `ERROR 1049 (42000): Unknown database 'parking_guidance'` indicates that MySQL cannot find the database you are trying to access. Here's what you can do to resolve this issue:

1. **Check if the database exists:** Use the `SHOW DATABASES;` command to ensure that the 'parking_guidance' database is indeed not present in your current setup.

2. **Create the database:** If it doesn't exist, run the following command to create it:

   CREATE DATABASE parking_guidance;

3. **Grant privileges:** If you have not already done so, you'll need to grant privileges to your user account to access this new database. For example:

   GRANT ALL PRIVILEGES ON parking_guidance.* TO 'your_username'@'localhost' IDENTIFIED BY 'your_password';

Replace 'your_username' and 'your_password' with your actual MySQL credentials.

4. **Switch to the new database:** After granting privileges, use `USE parking_guidance;` to switch to the newly created database.

5. **Confirm connection:** Double-check that you can connect to the 'parking_guidance' database without any errors by running a simple query.

If you've already created the database and granted privileges, check for typos in the database name or user credentials. Make sure they match exactly as you specified them.

mysql: [Warning] Using a password on the command line interface can be insecure. mysql: [Warning] Using a password on the command line interface can be insecure.

这个警告信息表示您正在使用命令行界面输入 MySQL 登录密码，这种方式可能不够安全。为了避免密码被泄露或其他安全问题，建议您使用其他方式来输入登录密码。

一种更为安全的方式是使用 MySQL 配置文件（my.cnf 或 my.ini）来配置登录信息。您可以在配置文件中指定登录用户名和密码，然后使用 mysql 命令来登录 MySQL。例如，您可以在 my.cnf 文件中添加以下内容：

[client]
user=yourusername
password=yourpassword

然后使用以下命令来登录 MySQL：

mysql

这样，MySQL 将自动使用您在配置文件中指定的用户名和密码登录。

另外，如果您需要在命令行中输入密码，可以使用以下命令来指定登录密码，而不是将密码明文显示在命令行中：

mysql -u yourusername -p

这样，MySQL 将提示您输入密码，而不是在命令行中显示密码。