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CategoryID is an IDENTITY column in the Category table, and its value is automatically generated by the database when inserting a new record. CREATE PROCEDURE CreateCategory (@DepartmentID int, @CategoryName varchar(50), @CategoryDescription varchar(50)) AS INSERT INTO Category (DepartmentID, Name, Description) VALUES (@DepartmentID, @CategoryName, @CategoryDescription) UpdateCategory The UpdateCategory stored procedure updates the name and description of a category. CREATE PROCEDURE UpdateCategory (@CategoryID int, @CategoryName varchar(50), @CategoryDescription varchar(1000)) AS UPDATE Category SET Name = @CategoryName, Description = @CategoryDescription WHERE CategoryID = @CategoryID DeleteCategory DeleteCategory deletes a certain category from the database. If the category has products that belong to it, the database raises an error because the deletion affects the database integrity remember that you have implemented the One-to-Many relationship between Category and Product tables using a foreign-key relationship back in 4. In this case, the error is trapped in the business tier, which returns an error code to the presentation tier, which informs the user that an error has occurred. CREATE PROCEDURE DeleteCategory (@CategoryID int) AS DELETE FROM Category WHERE CategoryID = @CategoryID

Next, you need to come up with some MIME types corresponding with the content your content provider will provide. Android uses both the content Uri and the MIME type as ways to identify content on the device. A collection content Uri or, more accurately, the combination authority and data type path should map to a pair of MIME types. One MIME type will represent the collection; the other will represent an instance. These map to the Uri patterns listed in the previous section for no-identifier and identifier, respectively. As you saw earlier in this book, you can fill a MIME type into an Intent to route the Intent to the proper activity (e.g., ACTION_PICK on a collection MIME type to call up a selection activity to pick an instance out of that collection). The collection MIME type should be of the form vnd.X.cursor.dir/Y, where X is the name of your firm, organization, or project, and Y is a dot-delimited type name. So, for example, you might use vnd.tlagency.cursor.dir/sekrits.card.pin as the MIME type for your collection of secrets. The instance MIME type should be of the form vnd.X.cursor.item/Y, usually for the same values of X and Y as you used for the collection MIME type (though that is not strictly required).

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Now you ll write the methods of the CatalogAccess class that support the functionality required by the CategoriesAdmin user control. These methods use the stored procedures mentioned earlier to perform their functionality: GetCategories, CreateCategory, UpdateCategory, and DeleteCategory. Add these methods to your CatalogAccess class in CatalogAccess.cs:

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Creating a content provider involves four basic steps: create a provider class, supply a Uri, declare the properties, and update the manifest.

// Create a new Category public static bool CreateCategory(string departmentId, string name, string description) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CreateCategory"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@DepartmentID"; param.Value = departmentId; param.DbType = DbType.Int32; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@CategoryName"; param.Value = name; param.DbType = DbType.String; param.Size = 50; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@CategoryDescription"; param.Value = description; param.DbType = DbType.String; param.Size = 1000; comm.Parameters.Add(param); // result will represent the number of changed rows int result = -1; try { // execute the stored procedure result = GenericDataAccess.ExecuteNonQuery(comm); } catch { // any errors are logged in GenericDataAccess, we ignore them here } // result will be 1 in case of success return (result != -1); }

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