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Explain Yii’s “Query” class and its usage.

Explain Yii’s “Query” class and its usage.

Answer: Yii’s “Query” class is a core component of the Yii framework used for building and executing database queries in an object-oriented manner. It provides a fluent interface for constructing SQL queries with methods for specifying conditions, sorting, grouping, and more, without the need for writing raw SQL.

Usage:
1. Creating Queries: You can create an instance of `yiidbQuery` to start building a query.
2. Selecting Data: Use methods like `select()`, `from()`, and `where()` to specify what data you want and from where.
3. Executing Queries: Call `all()`, `one()`, or `count()` to execute the query and retrieve results.
4. Chaining Methods: You can chain methods to refine the query, such as adding joins, grouping, and ordering.

Example:
“`php
$users = (new yiidbQuery())
->select([‘id’, ‘username’])
->from(‘user’)
->where([‘status’ => 1])
->orderBy(‘username’)
->all();
“`

This returns an array of active users ordered by username.

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