![]() ![]() ![]() For further information, see the full documentation on split queries. Split queries can be enabled by placing the new AsSplitQuery operator anywhere in your LINQ query, or globally in your model's OnConfiguring. INNER JOIN "Album" AS a0 ON a."Id" = a0."ArtistId" With split queries, the following SQL is generated instead: SELECT a."Id", a."Name" LEFT JOIN "Album" AS a0 ON a."Id" = a0."ArtistId" Serializable or snapshot transactions can be used to mitigate this and achieve consistency with split queries, but that may bring other performance costs and behavioral difference.įor example, consider a query that pulls in two levels of related collections using Include: var artists = context.Artistsīy default, EF Core will generate the following SQL when using the SQLite provider: SELECT a."Id", a."Name", a0."Id", a0."ArtistId", a0."Title" This can significantly improve performance, but can result in inconsistency in the results returned if the data changes between the two queries. However, this can become very slow when the query uses Include or a projection to bring back multiple related collections.ĮF Core 5.0 now allows a single LINQ query including related collections to be split into multiple SQL queries. This ensures consistency of the data returned within the constraints of the transaction mode in use. Starting with EF Core 3.0, EF Core always generates a single SQL query for each LINQ query. The join table can still be customized and queried explicitly if needed.įor further information, see the full documentation on many-to-many. Data can be queried and updated without explicitly referencing the join table, considerably simplifying code. Many-to-manyĮF Core 5.0 supports many-to-many relationships without explicitly mapping the join table.įor example, consider these entity types: public class PostĮF Core 5.0 recognizes this as a many-to-many relationship by convention, and automatically creates a PostTag join table in the database. For the full list of issues in the release, see our issue tracker.Īs a major release, EF Core 5.0 also contains several breaking changes, which are API improvements or behavioral changes that may have negative impact on existing applications. The following list includes the major new features in EF Core 5.0. ![]()
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