How to use database connection configuration (Database Configuration) in the CakePHP framework

How to use database connection configuration (Database Configuration) in the CakePHP framework

When using the CakePHP framework for web development, database connection is an indispensable part. This article will introduce how to correctly configure and use database connections in the CakePHP framework.

In CakePHP, the configuration file for database connection is located in the config/app.php file. In this file, you can find an array named Datasources, which contains all database connection configurations in the CakePHP framework. In this array, you can configure parameters for each database connection, including database type, host address, username, password, etc.

First, let us take a look at a basic database connection configuration example:

'Datasources' => [
     'default' => [
        'className' => 'CakeDatabaseConnection',
         'driver' => 'CakeDatabaseDriverMysql',
         'persistent' => false,
         'host' => 'localhost',
         'username' => 'myuser',
         'password' => 'mypassword',
         'database' => 'mydatabase',
         'encoding' => 'utf8',
         'timezone' => 'UTC',
         'cacheMetadata' => true,
     ],
],

In the above configuration example, we configured a database connection named default , using the MySQL database. Among them, the className parameter specifies the class name of the database connection, and the driver parameter specifies the database driver.

In addition to default, you can also configure multiple database connections in the Datasources array by specifying a unique key name for each connection.

After you complete the configuration of the database connection, you can use the following code in your CakePHP application to obtain and use the database connection:

$connection = ConnectionManager::get('default');
$query = $connection->newQuery();
$results = $query->select(['id', 'username'])
             ->from('users')
             ->execute()
             ->fetchAll('assoc');

The above code first uses ConnectionManager# The get method of the ## class obtains the database connection named default. Then, we created a new query object and performed query operations on the query object.

The query results are returned through the

fetchAll() method and stored in the $results variable in the form of an associative array. You can extract the required data from the results according to your needs.

In addition to the above examples, you can also use more complex query operations and data operations, such as inserts, updates, and deletes, etc. The CakePHP framework provides a rich database operation interface, allowing you to easily perform database operations.

Summary:

By configuring the correct database connection parameters, you can easily perform database operations in the CakePHP framework. You only need to configure the database connection in the

config/app.php file and use the ConnectionManager class to obtain the connection object to query and operate the database. I hope this article helps you configure and use database connections when using the CakePHP framework.

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