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The return value is a Cursor, which contains methods for iterating over results (discussed in the Using Cursors section a little later in the chapter). If your queries are pretty much baked into your application, this is a very straightforward way to use them. However, it gets complicated if parts of the query are dynamic, beyond what positional parameters can really handle. For example, if the set of columns you need to retrieve is not known at compile time, puttering around concatenating column names into a comma-delimited list can be annoying, which is where query() comes in.

Figure 7-4. Processing Abandoned Shopping Carts activity diagram Again, later in the book I will explain in detail how you can set up this process. For now, a high-level discussion is sufficient. Therefore, this process will be a scheduled process as a job within the SQL Server database. A specific time will be established as to when this process should be executed. When this process is executed, as shown in the diagram, the stored procedure will query the database for the abandoned shopping carts. Abandoned shopping carts will be defined by the date on which they are created. Therefore, when the process is executed, if the current time is greater than the time limit specified, perhaps 24 hours, then those results will be deleted. If no results are found, then the process simply does nothing except ends the execution and waits until the next scheduled execution.

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The last method you need to implement is getType(). This takes a Uri and returns the MIME type associated with that Uri. The Uri could be a collection or an instance Uri; you need to determine which was provided and return the corresponding MIME type. For example, here is getType() from Provider: @Override public String getType(Uri url) { if (isCollectionUri(url)) { return(getCollectionType()); } return(getSingleType()); } As you can see, most of the logic delegates to private getCollectionType() and getSingleType() methods: private String getCollectionType() { return("vnd.android.cursor.dir/vnd.commonsware.constant"); } private String getSingleType() { return("vnd.android.cursor.item/vnd.commonsware.constant"); }

The query() method takes the discrete pieces of a SELECT statement and builds the query from them. The pieces, in the order they appear as parameters to query(), are as follows: The name of the table to query against The list of columns to retrieve The WHERE clause, optionally including positional parameters The list of values to substitute in for those positional parameters The GROUP BY clause, if any The ORDER BY clause, if any The HAVING clause, if any

When a user or customer is searching the website and finding items they are interested in, they are free to do so without registering an account. They can even add as many products to the shopping cart as they want without registering. However, when they want to begin the process of checking the items out of the shopping cart and offering the payment details, they will be prompted for their current username or password, or if they are not a current member, they will need to establish a user account. When establishing this user account, the system will need to record specific information. If the customer is a return customer and has an established username and password, they will have the ability to log in and bypass the registration process. This is a standard practice with most of today s e-commerce systems when making purchases online. Figure 7-5 shows the Account Registration activity diagram.

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