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The query shows that only one record remains in the apex_application_files view, which is the image we inserted earlier in the chapter, using the standard upload process (it has not been removed by the new process). The query against the uploaded_files table confirms that it now contains a record. If you take a look at the data in the uploaded_files table, as shown in Listing 9-12, you can see that the data has been correctly copied from the original base table. Listing 9-12. Custom Table Contains the New Data apexdemo@DBTEST> select 2 id, 3 bug_id, 4 name, 5 mime_type, 6 uploaded_by, 7 length(blob_content) as length 8 from 9 uploaded_files; ID BUG_ID FILENAME MIME_TYPE UPLOADED LENGTH ---------- ------- ------------ ---------- -------- ------1.3405E+15 20 Report1.jpg image/jpeg JOHN 47972 Most of the data in the uploaded_files table is copied directly from the apex_application_files view, such as the ID column, MIME_TYPE column, actual BLOB content (using the LENGTH procedure to show the BLOB content is 47,972 bytes), and so on. As noted earlier, we ve added the UPLOADED_BY column, which contains the application user, and the BUG_ID column, which contains a link back to the bug we created. Clearly, this simple example could be extended to store many more custom attributes for the uploaded file if necessary.

try { OdbcConnection dataConnection = new OdbcConnection(); dataConnection.ConnectionString = DataUtilities.ConnectionString; dataConnection.Open(); OdbcCommand dataCommand = new OdbcCommand(); dataCommand.Connection = dataConnection; // Build command string StringBuilder commandText = new StringBuilder("SELECT * FROM Products WHERE CategoryID="); commandText.Append(categoryID); commandText.Append(" AND UnitsInStock > 0"); dataCommand.CommandText = commandText.ToString(); OdbcDataReader dataReader = dataCommand.ExecuteReader(); while (dataReader.Read()) { Product product = new Product(); product.ProductID = dataReader.GetInt32(0); product.ProductName = dataReader.GetString(1); product.CategoryID = dataReader.GetInt32(3); product.Price = dataReader.GetDecimal(5); product.Quantity = dataReader.GetInt16(6); products.Add(product); } dataConnection.Close(); } catch(Exception e) { Console.WriteLine("Error: " + e.Message); } return products; } public static Product GetProduct(int ProductID) { Product product = null;

It s possible to make time configuration very complicated, but if you follow the default settings, it s Tip

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Now that we have a method to upload images to our own custom table, we need a method to allow our applications to access that data. Using the #WORKSPACE_IMAGES# and #APP_IMAGES# substitution variables will no longer work, because we have removed the original record from the apex_application_files underlying table. For a custom download procedure, you need to do two things: Create the procedure (obviously!). Allow that procedure to be called directly via a URL. Why does the procedure need to be called directly via a URL Remember that if you are trying to display an image, the user s browser is actually going to issue a request for the resource specified by the src attribute of the img tag. So you need to ensure that the web browser can access your download procedure as a URL. You do this by creating a procedure and then granting execute access on that procedure to the user specified in the DAD (so that the mod_plsql handler can access and execute the procedure.)

actually rather easy. For instance, the first server installed in eDirectory can be configured to get its time from a trustworthy Internet NTP time source. This server will be the time provider in the network. All other servers are then automatically configured to get their time from this server. I recommend using this default setup since it works well. Only use the information that follows to tune your own NTP time server if somehow this information doesn t work for you.

Caution Without execute access granted on your procedure, the user specified in the DAD will not be

Though time synchronization is not a function offered by eDirectory, it is largely dependent upon it. Whenever a change to an object is made, timestamps in this object are changed. When a server initializes a synchronization with another server, it compares these timestamps with its own timestamps. If time is not properly synchronized on the network, this can lead to problems. Time synchronization is a critical service in eDirectory because the information in eDirectory is scattered through different replicas. Since no replica has a leading role in synchronization, eDirectory must rely on another mechanism: a proper time synchronization. If all servers share the same time, information can be properly synchronized in the network.

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