Yii2 find one

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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.

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:. In this tutorial, we will mainly describe the usage of Active Record for relational databases. By default each Active Record class is associated with its database table. You may override this method if the table is not named after this convention. Also a default tablePrefix can be applied. The brackets around the table name are used for quoting in an SQL query. In the following example, we declare an Active Record class named Customer for the customer database table. Active Record instances are considered as models. By default, Active Record uses the db application component as the DB connection to access and manipulate the database data. As explained in Database Access Objects , you can configure the db component in the application configuration like shown below,.

Do yii2 find one that only safe attributes can be massively assigned, though. If the latter, the corresponding attribute values will be modified accordingly. Whether the model has an attribute with the specified name.

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. In this example, Active Record is providing an object-oriented interface for accessing data stored in the 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. For example, the above code can be rewritten as follows,.

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.

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Override this method to return the name of this column. Optimistic locking allows multiple users to access the same record for edits and avoids potential conflicts. Ensure the version value is submitted and loaded to your model before any update or delete. User Contributed Notes 4. The names of the relations of primary models to be loaded from database. To work with relational data using Active Record, you first need to declare relations in Active Record classes. Returns the schema information of the DB table associated with this AR class. List of attribute names that need to be saved. To achieve this goal, you can define data transformation methods in the Customer Active Record class like the following:. Sign up for free to join this conversation on GitHub. Unlike getValidators , each time this method is called, a new list of validators will be returned. Leave a comment. This above query brings back all customers, and for each customer it brings back all active orders. Additional column values to be saved into the junction table. The issue klimov-paul refers to is open.

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 schema information of the DB table associated with this AR class. The old attribute value. To use Optimistic locking: Create a column to store the version number of each row. The default implementation of this method will return all scenarios found in the rules declaration. When used it will produce ArgumentCountError. This works with all the typecasting functions of PHP like intval , floatval , boolval , etc Boolean, if set to true every error message for each attribute will be shown otherwise only the first error message for each attribute will be shown. If this is null, the validators for ALL attributes in the model will be returned. This is an internal method meant to be called to create active record objects after fetching data from the database. Note that this method will not trigger any events. During each life cycle, a certain sequence of methods will be invoked, and you can override these methods to get a chance to customize the life cycle. Tip: The above example shows a generic way of transforming data in different formats.