How to Extract SQL Code from Entity Framework Core IQueryable?

Extract SQL Code from Entity Framework Core IQueryable

In Entity Framework Core, obtaining the SQL code generated by an IQueryable query is crucial for debugging and performance analysis. However, unlike previous versions of Entity Framework, ToTraceString is no longer available in EF Core.

EF Core 5/6

In recent versions of EF Core (5.0 and above), you can retrieve the SQL code using the ToQueryString() method:

var query = _context.Widgets.Where(w => w.IsReal && w.Id == 42);
var sql = query.ToQueryString();

EF Core 2.1.2 and Older

For older versions of EF Core (2.1.2 and below), you can use the following code to obtain the SQL code:

public static string ToSql<TEntity>(this IQueryable<TEntity> query)
{
    // ... (code omitted for brevity) ...
}

Note that this code requires an extension method definition to access internal fields of EF Core.

EF Core 3.0

In EF Core 3.0, you can use the following method:

public static string ToSql<TEntity>(this IQueryable<TEntity> query)
{
    // ... (code omitted for brevity) ...
}

This method also requires an extension method definition to access internal fields.

EF Core 3.1 and Above

Starting from EF Core 3.1, you can use the following method:

public static string ToSql<TEntity>(this IQueryable<TEntity> query) where TEntity : class
{
    // ... (code omitted for brevity) ...
}

This method uses reflection to access internal fields and provide SQL code from IQueryable queries.

The EF Core team also plans to introduce an official way to obtain SQL code in future releases.

The above is the detailed content of How to Extract SQL Code from Entity Framework Core IQueryable?. For more information, please follow other related articles on the PHP Chinese website!