How to connect db in Yii2?
To access a database, you must first connect by creating an instance of yii/db/Connection: $db = new yii/db/Connection([ ‘dsn’ => ‘mysql:host=localhost;dbname=example’ , ‘username’ => ‘root’, ‘password’ => ”, ‘charset’ => ‘utf8’, ]);
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How to check database connection in Yii2 framework?
To establish a connection to the database, set up $dsn, $username, and $password, and then call open() to connect to the database server. The current state of the connection can be checked using $isActive.
How to configure database in Yii2?
Set up a DB connection php and change the parameters to be correct for your database. By default, the file contains the following: ‘yii/db/Connection’, ‘dsn’ => ‘mysql:host=localhost;dbname=yii2basic’, ‘username’ => ‘root’, ‘password’ => ”, ‘charset’ => ‘utf8’, ];
How to use api in Yii2?
To allow the API to parse the JSON input, add the following to the request element. Delete member or book 123; Serve the app by running php yii serve and test your newly created endpoints. For example, to retrieve the book lists from the database, send a GET request to http://localhost:8080/books.
What is the REST API in yii2?
Summary. Using Yii’s RESTful API framework, implement an API endpoint in terms of a controller action, and use a controller to organize the actions that endpoints implement for a single resource type. Resources are represented as data models that extend from the yii/base/Model class.
How do I run a specific migration in Yii2?
- Creating Migrations. To create a new migration, run the following command: yii migrate/create
- Transactional Migrations.
- Applying Migrations.
- Reversal of Migrations.
- Redo Migrations.
- Showing migration information.
- Modification of the migration history.
- Migration Command Customization.
What does a connection do in Yii 2.0?
Connection represents a connection to a database through PDO. Connection works together with yiidbCommand, yiidb[&DataReader&] and yiidbTransaction to provide data access to multiple DBMSs in a common set of APIs. They are a thin wrapper of the PDO PHP extension. Connection supports database replication and read/write splitting.
What kind of database access objects does Yii Dao use?
Yii DAO is based on PHP Data Objects (PDO), which is an extension that provides unified data access to many popular DBMS, such as MySQL, PostgreSQL. Therefore, to use Yii DAO, the PDO extension and the specific PDO database driver (for example, PDO_MYSQL) must be installed. Yii DAO mainly consists of the following four classes:
What does cdbconnection mean in Yii Dao?
CDbConnection: Represents a connection to a database. CDbCommand: Represents an SQL statement to execute against a database. CDbDataReader – Represents a forward-only stream of rows from a query result set. CDbTransaction: Represents a DB transaction. Next, we introduce the use of Yii DAO in different scenarios. 1.
Is there an OpenAPI template for yii2 application?
Based on yii2-openapi (code generator) and php-openapi (spec reader and validator). This app template does not contain any useful code, it just provides the directory structure for your API project. All code is generated from an OpenAPI API description file.