postgresql

Entity Framework 4 RC allows you to create and drop databases in run-time using SSDL for DDL generation. Now ObjectContext has CreateDatabase(), DropDatabase(), and CreateDatabaseScript() methods. They appeared in Entity Framework v4 CTP for Code Only and only for SQLClient initially but later they became available for other EF-providers.

In this article we describe implementation of these methods in Devart data providers. We are using dotConnect for Oracle as a data provider in the following examples. Northwind is used as a sample database.

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We have supported new functionality of Entity Framework 4 including Entity Framework v4 Release Candidate for dotConnect for Oracle, dotConnect for MySQL, dotConnect for PostgreSQL, and dotConnect for SQLite. In this article we consider basic new supported possibilities in comparison with Entity Framework v1. Take into account that the new features of Entity Framework v4 like Persistence Ignorance (POCO), Self-tracking entities, Code Only etc. which don’t require support of the provider writers aren’t described here.

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Article was updated on 3/4/2010

This article can be useful for programmers who want to develop cross-database applications and use the canonical functions.

Entity Framework Canonical Functions are a set of functions, which are supported by all Entity Framework providers. These canonical functions are translated to the corresponding data source functionality for the provider.

The tables below contain information about these functions supported by the Devart products.
Functions supported by the following DBMS: MySQL, PostgreSQL, Oracle, SQLite, SQL Server 2005, and SQL
Server 2008 are marked in green.

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Introduction

In this article we consider how to build Entity Framework models using PostGIS objects in Entity Developer. PostGIS is a popular spatial extension for PostgreSQL that gives one an opportunity to work with geographic objects. To create and use such models we will:

• use a .NET wrapper for PostGIS (SharpMap)
• build a new Entity C# code generation template in order to enable geometry types support
• write some code dealing with change tracking

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