efcore
https://github.com/dotnet/efcore
C#
EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.
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- Issues
- Allow safe numerical comparisons across types
- JSON-absent required complex collection materializes as null under ComplexProperty().ToJson(), then throws InvalidOperationException in PrepareToSave on save
- JSON mapping via complex types is significantly slower than via owned entities for nested hierachies
- Allow providers to overwrite structural type scalar property order
- Exeption when querying json, that happens only on Azure SQL with compatibility level 170
- Query: whole non-entity object from a plain (non-aggregated) LeftJoin/DefaultIfEmpty inner is not nulled on no-match
- SqlServer: KeyNotFoundException in RewriteOperations when a temporal table is renamed into the model's default schema
- Cosmos: equality on a hierarchical partition-key prefix is lifted out of WHERE into the partition hint, forgoing the index and scanning the physical partition
- Cosmos: Handle late discriminators in materialization
- Query translation fails when `Where` references a projection guarded by `child != null && grandChild != null`
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