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public DataUtilities() { } public static string ConnectionString { get { return connectionString; } set { DataUtilities.connectionString = value; } } } } Then every other place where a connection string is used will be replaced with a property getter call to the DataUtilities class. One example is the ProductData class in the DataLayer project. That class will now look like Listing 15-2. Listing 15-2. ProductData.cs with Call to DataUtilities.cs #region Using directives using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Data.Odbc; using System.Text; using BusinessLayer; #endregion namespace DataLayer { public class ProductData { public ProductData() { } public static ArrayList GetProductsByCategory(int categoryID) { ArrayList products = new ArrayList();

If the user has selected a file to upload, we insert a record into our custom uploaded_files table by selecting the record that was just inserted into the underlying table from the apex_application_files view by using the name of the file Notice that the P2_UPLOAD page item contains the unique name of the file, so we can be sure that we get the correct file Finally, we remove the original record from underlying table of the apex_application_files view The uploaded file is in the underlying table only temporarily, between the time it is uploaded and the time our postprocessing process runs We can test the postprocessing process by creating a new bug and uploading a new image We can then query the apex_application_files view and our new uploaded_files table, as shown in Listing 9-11 Listing 9-11.

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Figure 8-3. The eDirectory database is stored in several files, which together compose the FLAIM database. The last part of the eDirectory database is the stream files. These are the files that start with a hexadecimal number and end with the extension .nds. Normally, you ll find quite a lot of them. Stream files are used to store attributes of the type Stream, like login scripts and print job configurations in the database. These attributes are not stored in the actual database, because that would be inefficient.

We have just looked at the eDirectory database stored in the files on your server s hard drive. There s another part to eDirectory too the service that makes these files accessible: the eDirectory service, or the nds service (eDirectory was called nds in the old days). As an administrator, it s important to know how to stop and start this service. If you re administrator of an OES - NetWare server, you have to deal with DS.NLM. You can unload it by using unload ds.nlm at the server console, and you can load it again by just issuing the command ds. On OES - Linux, the directory service is started with the program file /usr/sbin/ndsd. Of course, you can stop it like any other process with kill, but there s a nicer way of doing so. The startup script /etc/init.d/ndsd manages the automatic starting of ndsd from your default runlevel. You can also use this script to stop and start the service manually. For instance, use /etc/init.d/ ndsd stop to stop the service, /etc/init.d/ndsd start to start it, or /etc/init.d/ndsd restart to stop and start the service. Though the commands just listed can be used to stop and start the eDirectory service, you ll find you rarely need to restart the Directory service this way. They re really used more as troubleshooting tools. You can read more about this in the section eDirectory Troubleshooting at the end of this chapter.

Querying the uploaded_files Table After Uploading apexdemo@DBTEST> select count(*) from apex_application_files; COUNT(*) ---------1 apexdemo@DBTEST> select count(*) from uploaded_files; COUNT(*) ---------1.

For eDirectory to function properly, it s important that all servers in the network agree on the time that s used. This is because the synchronization of changes in eDirectory is based on timestamps. When determining if anything needs to be changed, servers in the network compare timestamps in objects in the Directory. Based on these timestamps, synchronization does or does not take place. If the difference in time on servers that need to synchronize is too big, there s a risk that a change won t be recognized and won t get changed on the network. This could result, for example, in a password change on one server that doesn t get through to another server. In such cases, the user would need his new password on one server, yet require his old password on the other. In OES, there are two mechanisms that can be used to synchronize time. The first (and default) mechanism is based on the Network Time Protocol (NTP). The second employs the legacy Timesync mechanism. If you re running OES - Linux, NTP is the only option. If OES NetWare is used, you can choose between NTP and Timesync.

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