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private Roles _roles; private void RolesEdit_Load(object sender, EventArgs e) { try { _roles = Roles.GetRoles(); } catch (Csla.DataPortalException ex) { MessageBox.Show(ex.BusinessException.ToString(), "Data load error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); } catch (Exception ex) { MessageBox.Show(ex.ToString(), "Data load error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); } if (_roles != null) this.rolesBindingSource.DataSource = _roles; } Most of this code exists to gracefully handle exceptions. Only two lines really matter: _roles = Roles.GetRoles(); and this.rolesBindingSource.DataSource = _roles; The first retrieves the Roles object, and the second sets the data source using that object. Setting the DataSource property of the BindingSource control automatically connects all the data bound controls on the form to the underlying data source object. The result is that data in the object is displayed in the controls and is available for editing by the user. Of course, the exception-handling code is important too. If an exception occurs during the normal data portal processing, including within the DataPortal_Fetch() method of the Roles object, a Csla.DataPortalException will be thrown. To get at the original exception thrown by the business code, use the BusinessException property. Remember that you can also use the BusinessObject property to get a reference to the business object as it was when the exception was thrown a fact that can be very useful for debugging. It is far less likely that any other exception will be thrown, but I ve included code showing how to catch those exceptions as well. If you look at the client-side DataPortal code from 4, you ll see that very little code executes that can throw exceptions other than a DataPortalException, so other types of exceptions typically only occur during development and debugging.

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Choose Your Database Objects: Here choose both Books and BookDetails tables and set Model Namespace to ApressBooksModel and click the Finish button. When you click Finish, you will be presented with a class diagram of the DataModel.edmx entity just created, as shown in Figure 6-24.

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The concept of using the buffer cache hit ratio (BCHR) as a barometer for determining how well the database instance is performing has been around since at least the mid 1990s (plus or minus a decade). The motivation for using this ratio as a reference is founded on the principle that it takes 1,000 times (or 10 times or 100 times or 10,000 times) longer to fetch a block from disk than from the server s RAM. The suggestions for the use of the BCHR statistic are typically one of the following: If the buffer cache hit ratio falls below x percent, increase the DB_CACHE_SIZE parameter, increase the DB_BLOCK_BUFFERS parameter, move objects to the KEEP buffer pool, and so forth. If the buffer cache hit ratio increases or decreases significantly, something in the system has changed, and the problem should be investigated.

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Note The following information applies only to Oracle9i Release 1 and before. In Oracle9i Release 2 and above,

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