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You will encounter a few limitations when you bind directly to a DataReader. Because the DataReader is a forward-only cursor, you can t bind your data to multiple controls. You also won t have the ability to apply custom sorting and filtering criteria on the fly. Finally, unless you take care to code your page using generic interfaces such as IDataReader, you lock your code into the data provider you re currently using, making it more difficult to modify or adapt your code in the future. To solve these problems, you can use the disconnected ADO.NET data objects. If you fill a disconnected DataSet, you can bind that to one or more controls, and you can tailor the sorting and filtering criteria. The DataSet is also completely generic no matter which data provider you use to fill your DataSet, the DataSet itself (and the data binding code) looks the same. Technically, you never bind directly to a DataSet or DataTable object. Instead, you bind to a DataView object. A DataView represents a view of the data in a specific DataTable. That means the following: grid.DataSource = dataTable; grid.DataBind(); is equivalent to this: grid.DataSource = dataTable.DefaultView; grid.DataBind();

When a model instance is being committed to the database, Django provides two ways to hook into that process, both at the beginning and at the end The primary difference, therefore, between the two is that is called before the object was committed to the database, while is called afterward This simple distinction can be very important, depending on the needs of the application When triggered by , a listener receives the model class as , and also the instance of the model as This allows the listener to get access to and even modify the instance that s about to be saved, before it hits the database This can be a useful way to provide or override default arguments for models provided by third-party applications On the other hand, is called after the save has been performed, and the instance has been committed to the database.

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It s important to note that every DataTable includes a default DataView object that s provided through the DataTable.DefaultView property. This sleight of hand allows you bind directly to the DataTable. If you do, ASP.NET actually uses the default DataView automatically. The default DataView doesn t apply any sort order and doesn t filter out any rows. If you want to tweak these settings, you can either configure the default DataView or create your own and explicitly bind it.

In 7 and 8, you saw how you can directly connect to a database, execute a query, loop through the records in the result set, and display them on a page. In this chapter, you ve already seen that you have a simpler option; with data binding, you can write your data access logic and then show the results in the page with no looping or control manipulation required. Now, it s time to introduce another convenience data source controls. With data source controls, you can avoid writing any data access code.

As you ll soon see, there s often a gap between what you can do and what you should do. In most professional, large-scale applications, you ll still need to write and fine-tune your data access code for optimum performance, data aggregation, error handling, logging, and so on. Even if you do, you can still use the data source controls just don t expect to escape without writing any code!

This is a useful step in two ways, because it not only ensures that the data is in fact present in the database, which is necessary when dealing with related models, but it also occurs after Django has made the decision about whether to insert a new record into the database or update an existing record In addition to the and arguments that work the same way as in , listeners for can receive another argument The argument is a Boolean indicating whether or not the instance had to be created from scratch A value of means it was newly inserted into the database, while means an existing record was updated When using the signal to track database changes, this is an important distinction, and can be used to determine the behavior of other applications To see this in action, see the history example in 11 of this book.

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