Yii2 find one

ActiveRecord is the base class yii2 find one classes representing relational data in terms of objects. Active Record implements the Active Record design pattern. The object's attributes are mapped to the columns of the corresponding table. Referencing an Active Record attribute is equivalent to accessing the corresponding table column for that record.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. But findOne behaves strangely in the case. And I didn't find the description of this behavior in any documentation.

Yii2 find one

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I discovered this recently when I noticed performance degradation on large datasets. This may seem insignificant, but according to how indexes work, it may cause huge performance degradation on large datasets. The reason is, that SQL in [1] will not stop column scan when founds first match and will continue until whole column scanned. On tables with millions of records this has significant negative performance impact. So variant [1] works flawlessly only on columns with primary or unique indexes , where the ID uniqueness is guaranteed. It performs badly on columns with common KEY indexes because uniqueness cannot be guaranteed. However, since the method name one or findOne suggests it will return only one first match it makes no sense to continue scanning after matching first record. So by adding LIMIT 1 it would stop scanning also on non-unique indexes and ensure optimal performance. Or did i miss some reason why it may not be added? If not I guess this should be emphasized in documentation so developers would realize described performance difference. I have seen couple of complaints about Yii2 DB performace around and this issue could be possibly related.

If the latter, the array key should be the field name while the array value should be the corresponding field definition which can be either an object property name or a PHP callable returning the corresponding field value. Reload to refresh your session, yii2 find one.

Active Record provides an object-oriented interface for accessing and manipulating data stored in databases. An Active Record class is associated with a database table, an Active Record instance corresponds to a row of that table, and an attribute of an Active Record instance represents the value of a particular column in that row. Instead of writing raw SQL statements, you would access Active Record attributes and call Active Record methods to access and manipulate the data stored in database tables. For example, assume Customer is an Active Record class which is associated with the customer table and name is a column of the customer table. You can write the following code to insert a new row into the customer table:. The above code is equivalent to using the following raw SQL statement for MySQL, which is less intuitive, more error prone, and may even have compatibility problems if you are using a different kind of database:.

The latter is invoked by the former implicitly when you call one of the query methods. All the query building methods return the query object itself, which allows you to chain multiple calls together. You can specify columns to be selected in either an array or a string, like the following. The column names being selected will be automatically quoted when the SQL statement is being generated from a query object. For example,. If you are using the array format to specify columns, you can also use the array keys to specify the column aliases.

Yii2 find one

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I'm new to Yii and I've been just changing default User class to make it depend on database rather than on static attribute.

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Whether to treat behaviors' methods as methods of this component. If the DB table does not declare any primary key, you should override this method to return the attributes that you want to use as primary keys for this AR class. An attribute is considered dirty if its value has been modified since it was loaded from DB or saved to DB most recently. By default an attribute label is generated using generateAttributeLabel. Nested fields are separated with dots. Returns the attribute names that are safe to be massively assigned in the current scenario. Edit it on github! Since 2. You can also respond to certain Active Record events triggered during a life cycle to inject your custom code. The fields requested for extraction. Same will happen for the newly saved record. Otherwise, this record will remain unchanged.

These methods can be chained together. A more detailed usage guide on how to work with Query can be found in the guide article on Query Builder.

As an example, say that the Customer ActiveRecord class is associated with the customer table. Calling joinWith will eagerly load the related data by default. Unlike getValidators , each time this method is called, a new list of validators will be returned. Info: When you declare a relation named xyz via a getter method getXyz , you will be able to access xyz like an object property. Returns the attribute names that are safe to be massively assigned in the current scenario. Child classes may override this method to declare different validation rules. Child classes may override this method to specify the behaviors they want to behave as. This method will call beforeValidate and afterValidate before and after the actual validation, respectively. To use Optimistic locking: Create a column to store the version number of each row. Or add OptimisticLockBehavior to your model class in order to automate the process. Referencing an Active Record attribute is equivalent to accessing the corresponding table column for that record. Note: Be very careful when calling deleteAll because it may totally erase all data from your table if you make a mistake in specifying the condition. As explained in Database Access Objects , you can configure the db component in the application configuration like shown below,. This method is similar to fields except that the list of fields returned by this method are not returned by default by toArray.