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You ll always have information to change and new data to collect, so providing a way to add new information to your databases is pretty crucial. Some sites may hide this functionality away in an administration section. How inserting data is handled depends on what the database models and who is logged on. For instance, Amazon hides the functionality to add new product information from you, the public, but it does let you add new feedback, and user information to its database, provided you re logged in. Similarly, eBay allows anyone to add a new auction to its database, but only the auctioneer can change those details. Security, then, is also a very important issue to consider.

Subversion uses an unstable /trunk policy, which means that most development is done right in the main /trunk branch However, for changes that are likely to be either disruptive to other developers (by breaking existing functionality for a time, for example) or that are highly experimental and might never be destined to be merged into the trunk, a branch will be created The Subversion code base is split into several libraries, each of which lives in its own subdirectory Because most changes of this sort will be limited to one of those libraries, you might make the branch via an svn copy command targeting the repository directly, and then switch the affected subdirectory over to that branch.

At the heart of the code to add new information to a database is the SQL INSERT query. Although it may seem otherwise, sending an INSERT query to a database is the only way to do this. Compared to the complexities of the SELECT query, the INSERT query is quite simple. INSERT [INTO] <table name> [ (column list) ] VALUES ( column value list ) The query doesn t need to be split over three lines, but that format makes it easier to see that it has six pieces: The keyword INSERT denotes the action to the database. The optional keyword INTO makes the query more readable. The table name identifies the table to which you re adding information. The (comma-separated) column list names the columns in the new row to which you re giving values. Although this isn t required, it is a good idea to specify it. It makes the query easier to follow and can reduce the risk of problems when you make changes to the database structure. The keyword VALUES separates the column list from the column value list. The (comma-separated) column value list contains a value for each of the columns in the column list for the new row. The number of the items in the column list should equal the number of items in the column value list and be ordered in the same way. Thus, the first column named in the column list will be filled with the first value in the column value list, the second with the second, and so on. Each value can be one of the following:

The doInBackground() method is invoked in a background thread. Hence, we can take as long as we like. In a production application, we might be doing something like iterating over a list of URLs and downloading each. Here, we iterate over our static list of lorem ipsum words, call publishProgress() for each, and then sleep 1/4 second to simulate real work being done. Since we elected to have no configuration information, we should not need parameters to doInBackground(). However, the contract with AsyncTask says we need to accept a varargs of the first data type, which is why our method parameter is Void... unused. Since we elected to have no results, we should not need to return anything. Again, though, the contract with AsyncTask says we must return an object of the third data type. Since that data type is Void, our returned object is null.

not to record the answers given to it. It would be a huge waste of resources to rebind the data every time the page was posted back to the Web server, especially if the page were complex. It would also lose the values the user had entered onto the page if it were posted back, because the rebinding would write over them. This is obviously not ideal. We ll look at how to manage when the data binding occurs in this chapter s examples.