Impatient is a remarkable library designed to empower developers to build robust LINQ query providers specifically for SQL databases. With features supporting various LINQ query operators and full JSON database support, Impatient makes querying a breeze. In this article, we will explore how to set up Impatient.EntityFrameworkCore.SqlServer, understand its compatibility, and delve into its unique offerings.

Getting Started with Impatient.EntityFrameworkCore.SqlServer

Setting up Impatient is straightforward. Follow these steps:

1. Install Impatient.EntityFrameworkCore.SqlServer.
2. Add UseImpatientQueryCompiler() to your DbContextOptions:

services.AddDbContext<NorthwindDbContext>(options => 
    options.UseSqlServer(connectionString)
           .UseImpatientQueryCompiler());

3. Cross your arms, tap your foot, and run your queries with impatience!

Versioning Compatibility

Currently, Impatient supports SQL Server 2016 or newer. It’s essential to note that the Impatient package employs an unstable version number as substantial API changes are expected before it stabilizes. The versioning scheme of Impatient.EntityFrameworkCore.SqlServer aligns with the minor version of EF Core it supports.

More About EF Core

Implementation Differences

• Impatient has a basic implementation of async queries without leveraging cancellation tokens. However, improvements in this area are in the pipeline.
• This library takes a pessimistic approach towards change tracking during client evaluations, differing from EF Core.
• When dealing with manual left joins, nullability propagation for navigations is not currently supported. Instead, it is advisable to use navigations all the way through.
• OrderBy called consecutively will not perform a stable sort.
• Runtime exceptions related to expressions on DbParameter values are rethrown wrapped in an InvalidOperationException.

Unsupported Features

As of now, Impatient does not support certain translations such as System.Convert calls, along with client evaluation warnings. Other limitations include:

• ROW_NUMBER paging is unsupported; only modern OFFSET FETCH NEXT is available.
• Null reference protection and FromSql are not supported.

How Impatient Translates Queries

A Primer

Think of the query processing as a chef preparing a dish in stages:

1. Preparation: Gathering and measuring ingredients (parameterizing the query).
2. Composition: Mixing ingredients together through various methods (composing expressions).
3. Compilation: Cooking the dish (translating the query to SQL).

In this process, Impatient translates complex query operators into SQL, enabling seamless database interactions.

The Query Processing Pipeline

The execution of a query goes through three main stages: Preparation, Composition, and Compilation. During these stages, queries are parameterized, composed into SelectExpressions, and finally translated into SQL, ensuring optimal performance and clarity.

Troubleshooting

If you encounter any issues, here are a few troubleshooting tips:

• Ensure your database engine is SQL Server 2016 or newer.
• Verify that UseImpatientQueryCompiler() is correctly added to the DbContextOptions.
• Look out for any nullability issues with navigation properties in your queries.

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