E1150 – how to prevent altering the legacy database schema when creating an xaf application _ devexpress support center

This example shows how to prevent altering the legacy database schema when creating an XAF application. Data recovery laptop Sometimes our customers want to connect their XAF applications to legacy databases, but they often have strong restrictions, which disallow making any changes in the legacy database schema, i.e. Data recovery flash drive adding new tables, new columns. Data recovery cost This is bad, because XAF creates the ModuleInfo table to use an application’s version for internal purposes. Data recovery galaxy s5 XPO itself can add the XPObjectType table to correctly manage table hierarchies when one persistent object inherits another one. Database key field Usually, legacy databases contain plain tables that can be mapped to one persistent object. Data recovery nashville So, the XPObjectType table is not necessary in such scenarios. However, one problem still remains: it is the additional ModuleInfo table added by XAF itself. Data recovery minneapolis The idea is to move the ModuleInfo and XPObjectType tables into a temporary database. For this task we introduced a custom IDataStore implementation, which works as a proxy. Database 4 net This proxy receives all the requests from the application’s Session objects to a data store, and redirects them to actual XPO data store objects based upon a table name that has been passed. 1. Iphone 6 data recovery software free In YourSolutionName.Module project create a custom IDataStore implementation as shown in the WinWebSolution.Module\XpoDataStoreProxy.xx file; 2. Database usa reviews In YourSolutionName.Module project create a custom IXpoDataStoreProvider implementation as shown in the WinWebSolution.Module\XpoDataStoreProxyProvider.xx file; 4. Easeus data recovery 94fbr Define connection strings under the element in the configuration files of your WinForms and ASP.NET executable projects as shown in the WinWebSolution.Win\App.config and WinWebSolution.Win\Web.config files. 1. Database join The approach shown here is intended for plain database tables (no inheritance between your persistent objects). H2 database download If the classes you added violate this requirement, the exception will occur as expected, because it’s impossible to perform a query between two different databases by default. 2. H2 database url One of the limitations is that an object stored in one database cannot refer to an object stored in another database via a persistent property. Data recovery boot disk Besides the fact that a criteria operator based on such a reference property cannot be evaluated, referenced objects are automatically loaded by XPO without involving the IDataStore.SelectData method. 990 database So, these queries cannot be redirected. Data recovery hard drive cost As a solution, you can implement a non-persistent reference property and use the SessionThatPointsToAnotherDatabase.GetObjectByKey method to load a referenced object manually. 3. As an alternative to the demonstrated proxy solution you can consider joining data from several databases into a database view and then mapping persistent classes to that view: How to: Map a Database View to a Persistent Class.

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