What is active query?
The Active Queries view shows queries that are in flight; that is, queries that are currently running or queued to run on the system. This view provides insight to the system’s current workload.
What is active record in Yii?
Active Record automatically maintains the list of dirty attributes. It does so by maintaining an older version of the attribute values and comparing them with the latest one. You can call yii\db\ActiveRecord::getDirtyAttributes() to get the attributes that are currently dirty.
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.
How to delete in yii2?
You can use $model->delete() for deleting model. As the result, according row in related table will be deleted. You can use beforeDelete() and afterDelete() event handlers together with this method to handle some tasks related with deletion.
What is Active query Builder?
Active Query Builder is a component for business applications which helps users without any SQL experience to work with SQL queries and get data fast. With Active Query Builder, users can get a clear view of database schema and design SQL queries with natural point-and-click actions rather than tedious typing.
Is active record an ORM?
ActiveRecord is an ORM. It’s a layer of Ruby code that runs between your database and your logic code.
How do I save an array in MySQL?
Use the PHP function serialize() to convert arrays to strings. These strings can easily be stored in MySQL database. Using unserialize() they can be converted to arrays again if needed.
What is the purpose of an ActiveRecord?
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.
Is ActiveRecord an ORM?
How does query builder work?
Query Builder is designed to enhance productivity and simplify SQL query building tasks. Query Builder provides a graphical user interface for creating SQL queries. You can drag-and-drop multiple tables, views and their columns onto a visual designer to generate SQL statements.
What is Query Builder in SQL?
The SQL Query Builder (SQB) is a component of the Data Tools Platform (DTP) SQL Development Tools project. ▪ The SQB is a software tool that allows end-users to create SQL queries using point-click-select and drag-drop gestures.
How to perform a query against a database using Yii\\DB\\command?
These methods can be chained together. By calling createCommand (), we can get a yii\\db\\Command instance which can be further used to perform/execute the DB query against a database. Query internally uses the yii\\db\\QueryBuilder class to generate the SQL statement.
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.
What is the use of exist in activequery?
exists (): returns a value indicating whether the query result has data or not. Because ActiveQuery extends from yii\\db\\Query, one can use query methods, such as where () , orderBy () to customize the query options.
What is activequery in ActiveRecord?
ActiveQuery represents a DB query associated with an Active Record class. An ActiveQuery can be a normal query or be used in a relational context. ActiveQuery instances are usually created by yii\\db\\ActiveRecord::find () and yii\\db\\ActiveRecord::findBySql () .