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66 lines
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66 lines
4.0 KiB
# Switch to EF Core Oracle Devart Provider
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This document explains how to switch to the **Oracle** database provider for **[the application startup template](Startup-Templates/Application.md)** which comes with SQL Server provider pre-configured.
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> This document uses a paid library of [Devart](https://www.devart.com/dotconnect/oracle/) company, See [this document](Entity-Framework-Core-Oracle.md) for other options.
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> Before switching your provider, please ensure your Oracle version is **v12.2+**. In the earlier versions of Oracle, there were long identifier limitations that prevents creating a database table, column or index longer than 30 bytes. With [v12.2](https://docs.oracle.com/en/database/oracle/oracle-database/12.2/newft/new-features.html#GUID-64283AD6-0939-47B0-856E-5E9255D7246B) "The maximum length of identifiers is increased to 128 bytes". **v12.2** and later versions, you can use the database tables, columns and indexes provided by ABP without any problems.
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## Replace the Volo.Abp.EntityFrameworkCore.SqlServer Package
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`.EntityFrameworkCore` project in the solution depends on the [Volo.Abp.EntityFrameworkCore.SqlServer](https://www.nuget.org/packages/Volo.Abp.EntityFrameworkCore.SqlServer) NuGet package. Remove this package and add the same version of the [Volo.Abp.EntityFrameworkCore.Oracle.Devart](https://www.nuget.org/packages/Volo.Abp.EntityFrameworkCore.Oracle.Devart) package.
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## Replace the Module Dependency
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Find ***YourProjectName*EntityFrameworkCoreModule** class inside the `.EntityFrameworkCore` project, remove `typeof(AbpEntityFrameworkCoreSqlServerModule)` from the `DependsOn` attribute, add `typeof(AbpEntityFrameworkCoreOracleDevartModule)`
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Also replace `using Volo.Abp.EntityFrameworkCore.SqlServer;` with `using Volo.Abp.EntityFrameworkCore.Oracle.Devart;`.
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## UseOracle()
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Find `UseSqlServer()` calls in your solution, replace with `UseOracle()`. Check the following files:
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* *YourProjectName*EntityFrameworkCoreModule.cs inside the `.EntityFrameworkCore` project.
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* *YourProjectName*DbContextFactory.cs inside the `.EntityFrameworkCore` project.
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In the `CreateDbContext()` method of the *YourProjectName*DbContextFactory.cs, replace the following code block
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```csharp
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var builder = new DbContextOptionsBuilder<YourProjectNameDbContext>()
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.UseSqlServer(configuration.GetConnectionString("Default"));
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```
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with this one
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```csharp
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var builder = (DbContextOptionsBuilder<YourProjectNameDbContext>)
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new DbContextOptionsBuilder<YourProjectNameDbContext>().UseOracle
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configuration.GetConnectionString("Default")
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);
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```
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> Depending on your solution structure, you may find more code files need to be changed.
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## Change the Connection Strings
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Oracle connection strings are different than SQL Server connection strings. So, check all `appsettings.json` files in your solution and replace the connection strings inside them. See the [connectionstrings.com]( https://www.connectionstrings.com/oracle/ ) for details of Oracle connection string options.
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You typically will change the `appsettings.json` inside the `.DbMigrator` and `.Web` projects, but it depends on your solution structure.
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## Re-Generate the Migrations
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The startup template uses [Entity Framework Core's Code First Migrations](https://docs.microsoft.com/en-us/ef/core/managing-schemas/migrations/) by default.
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EF Core Migrations depend on the selected DBMS provider. Changing the DBMS provider, may not work with the existing migrations.
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* Delete the `Migrations` folder under the `.EntityFrameworkCore` project and re-build the solution.
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* Run `Add-Migration "Initial"` on the Package Manager Console window (select the `.DbMigrator` (or `.Web`) project as the startup project in the Solution Explorer and select the `.EntityFrameworkCore` project as the default project in the Package Manager Console).
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This will scaffold a new migration for Oracle.
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Run the `.DbMigrator` project to create the database, apply the changes and seed the initial data.
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## Run the Application
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It is ready. Just run the application and enjoy coding.
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