Yii2 find one

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ActiveRecord is the base class for 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. As an example, say that the Customer ActiveRecord class is associated with the customer table. This would mean that the class's name attribute is automatically mapped to the name column in customer table.

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.

See also refresh. An array of ActiveRecord instances, or an empty array if nothing matches. The related records to be populated into the relation.

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:.

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.

Yii2 find one

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. Whether to select distinct rows of data only. The table s to be selected from. For example, ['user', 'post'].

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Because this method returns an ArrayObject object, you may manipulate it by inserting or removing validators useful in model behaviors. The following criteria are used to determine whether a rule is currently applicable:. What is the expected result? This method is a shortcut to update when data validation is not needed and only a small set attributes need to be updated. The old attribute values name-value pairs. All existing old attribute values will be discarded. When customizing the relational query for a relation, you should specify the relation name as an array key and use an anonymous function as the corresponding array value. Note: While this method saves memory and improves performance, it is closer to the lower DB abstraction layer and you will lose most of the Active Record features. Version 2. However, it may suffer from a performance issue when you need to access the same relation property of multiple Active Record instances. The primary-foreign key constraint. As an example, say that the Customer ActiveRecord class is associated with the customer table. The process usually takes the following three steps:. When used it will produce ArgumentCountError.

ActiveRecord is the base class for 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.

The process usually takes the following three steps:. See also: canGetProperty canSetProperty. When calling delete to delete an Active Record instance, the following life cycle will happen:. The form name to use to load the data into the model, empty string when form not use. Already have an account? The object's attributes are mapped to the columns of the corresponding table. The brackets around the table name are used for quoting in an SQL query. Defaults to null, meaning all attributes listed in attributes will be returned. See also hasAttribute. Parameters to be bound to the SQL statement during execution. The primary-foreign key constraint.