![]() Fluent mappingĪfter fluent mapping functionality became available, the development of applications that target multiple databases has grown significantly easier. * T4 code generation templates, especially for POCO and STE, are complex and cannot be conveniently modified. * Standard VS EDM Designer lacks many capabilities and does not support all capabilities of XML mapping, so that the user has to modify XML manually in the XML editor or use a third-party EF-designer. * Customization of generated code is performed through editing T4 templates. * If other types of code generation are used instead of standard EntityObjects code generation, the user can get POCO objects or self-tracking entities (STE). * When standard VS EDM Designer is used, most operations on creating and editing the model can be performed in the designer. * Support for all capabilities of Entity Framework mapping. For example, for more information on SQL Server + Oracle, see the articles Migrating database schema from Microsoft SQL Server to Oracle using Entity Framework and Preparing for multiple databasesĪdvantages of using XML-mapping for multiple databases: There are many detailed tutorials on the subject that can be referred to for more information. This is only a brief outline of the process. ![]() Further on, the correct EF connection string must be formed based on the provider-specific connection string and the names of required resources for each database. CSDL and MSL are the same, while the SSDL files are different for each database. The DDL SQL script for database creation and generated metadata must be saved to obtain a set of CSDL, MSL, SSDL files at each stage. Or they may initially use the Database-First approach against the model targeting one DBMS, then switch to the Model-First approach, change the target database by changing the connection and the DDL generation template, after which the mapping and storage parts of the model have to be re-generated. The developer can work entirely in the Model-First approach. Get expert guidance on building intelligent apps with Azure Container Apps and AI services. With the release of Entity Framework 4.1, it became possible to develop applications using fluent mapping. Entity Framework v1/v4 provided no choice – the developer had to use the XML mapping approach. If it is necessary to develop an application that supports several different databases, there are several solutions in Entity Framework. Using Multiple Databases in One Application LLBLGen Pro, an alternative EF-designer is also available.Hugatti DBML/EDMX Tools can be used to extend the capabilities of the standard Visual Studio editor.Devart Entity Framework providers contain a free EF-version of the fully functional designer for the development of ORM-models – Devart Entity Developer.For that reason, a number of third-party solutions have been created: In any case, the user must be ready for a situation when the standard capabilities of Visual Studio’s design-time model development are not convenient enough either conditioned by their limited functionality or such capabilities are intended for use with SQL Server and can hardly be conveniently used when working with Oracle, for example. There is no “best” approach – the choice of the approach depends on the specifics of a particular application and the scope of work. Presently, Entity Framework supports the following three approaches to development: Database-First, Model-First and Code-First. As examples of implementing EF-providers for databases other than SQL Server, we shall use Devart ADO.NET providers. I hope this will be useful both for users who create an EF-application for these databases for the first time as well as for those who create an application that must support interaction with multiple databases, i.e., SQL Server and Oracle. ![]() In this article, we shall briefly discuss some of the problems that the user may face in the process of developing an application for Entity Framework (EF), which is meant to interact with Oracle, MySQL, PostgreSQL or SQLite rather than Microsoft SQL Server. NET and LINQ, forgetting the specifics of particular databases, differences in their functionality and effectiveness of certain SQL-constructions. ![]() ORM users have grown accustomed to thinking in terms of. ![]()
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