Yii2 find one

ActiveRecord is the base class for classes representing relational data in terms of objects. Active Record implements the Active Record design pattern.

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?

By default, this method returns the model class name without the namespace part as the form name.

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:. In this tutorial, we will mainly describe the usage of Active Record for relational databases.

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']. How to group the query results. For example, ['company', 'department']. It can be either a string or an array. Please refer to where on how to specify the condition.

Yii2 find one

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. For example, the above code can be rewritten as follows,.

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If the table's primary key is auto-incremental and is null during insertion, it will be populated with the actual value after insertion. Am I right? We call xyz the first letter is in lower case the relation name. Behaviors can be attached using a name or anonymously. This is an internal method meant to be called to create active record objects after fetching data from the database. The element at the offset, null if no element is found at the offset. Note that this method will not perform data validation and will not trigger events. The form name to use to load the data into the model, empty string when form not use. Not namespaced classes Yii YiiRequirementChecker. CeBe at Apr 13, , AM. New issue. For example, you may declare a bigOrders relation as follows,. However, calling with , asArray or indexBy is still fine.

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It can be a built-in validator name, a method name of the model class, an anonymous function, or a validator class name. Some of your table columns may have default values defined in the database. If beforeSave returns false , the rest of the steps will be skipped; save the record into database. Parameters to be bound to the SQL statement during execution. We assume the Customer class has two relations orders and country , while the Order class has one relation items. The benefit of using link is even more obvious when a relation is defined via a junction table. The default implementation raises an afterValidate event. The relation name, e. The models to be populated. ActiveRecord instance matching the condition, or null if nothing matches. The additional fields being requested for exporting.