What is ActiveQuery in yii2?

Relational query In relational context ActiveQuery represents a relation between two Active Record classes. Relational ActiveQuery instances are usually created by calling yii\db\ActiveRecord::hasOne() and yii\db\ActiveRecord::hasMany().

What is ActiveRecord in yii2?

ActiveRecord is the base class for classes representing relational data in terms of objects. Active Record implements the Active Record design pattern. The premise behind Active Record is that an individual yii\db\ActiveRecord object is associated with a specific row in a database table.

How to delete Record in yii2?

Deleting Data To delete a single row of data, first retrieve the Active Record instance corresponding to that row and then call the yii\db\ActiveRecord::delete() method. $customer = Customer::findOne(123); $customer->delete(); You can call yii\db\ActiveRecord::deleteAll() to delete multiple or all rows of data.

How do I run a query in yii?

Call yii\db\QueryBuilder to generate a SQL statement based on the current construct of yii\db\Query; Create a yii\db\Command object with the generated SQL statement; Call a query method (e.g. queryAll()) of yii\db\Command to execute the SQL statement and retrieve the data.

What is active record in PHP?

Active record is an approach to access data in a database. A database table or view is wrapped into a class, thus an object instance is tied to a single row in the table. After creation of an object, a new row is added to the table upon save.

Which method is used to get all the active records from a table?

To retrieve objects from the database, Active Record provides a class method called Model. find. This method allows you to pass arguments into it to perform certain queries on your database without the need of writing raw SQL.

What is the purpose of Active Record?

Active Record facilitates the creation and use of business objects whose data requires persistent storage to a database. It is an implementation of the Active Record pattern which itself is a description of an Object Relational Mapping system.

How can active and inactive status in codeigniter?

In this tutorial, we are going to learn about how to create active inactive user status using codeigniter.

1. Step 1:- Create table in database.
2. Step 2:- Insert data in Users table.
3. Step 3: Create users controller in controller folder (Users.php)
4. Step 4: Create users_list page in View folder (users_list.php)

What is ActiveRecord?

Active records are documents still referred to frequently during the course of business. Active records are referenced at least once a month, and are usually maintained in a readily-accessible spot in the office space or office systems. INACTIVE RECORDS ARE INFREQUENTLY USED.

What is ORM in Ruby on Rails?

ORM is Object Relational Mapper. It means you don’t have to manually call the database yourself; the ORM handles it for you. Ruby on Rails uses one called ActiveRecord, and it’s a really good one. ORM allows you to do things such as: User. find(50).contacts.

How do I get query results from activeactivequery?

ActiveQuery mainly provides the following methods to retrieve the query results: one (): returns a single record populated with the first row of data. all (): returns all records based on the query results. count (): returns the number of records. sum (): returns the sum over the specified column.

How does Yii determine the primary key of a column?

Both methods can take one of the following parameter formats: a scalar value: the value is treated as the desired primary key value to be looked for. Yii will determine automatically which column is the primary key column by reading database schema information.

How to customize the query options in activequery?

Because ActiveQuery extends from yii\\db\\Query, one can use query methods, such as where () , orderBy () to customize the query options. with (): list of relations that this query should be performed with.

How to get the Count of a getter in a query?

As Kshitiz also stated, you could also just use yii\\db\\Query::createCommand (). If you are just interested in the count, use yii\\db\\Query as mentioned by others. Won’t require any changes to your model: Just a note, in case it helps anyone, that a getter used as a property is countable (whereas if called as a function it will return 1).