[Index(nameof(FirstName), nameof(LastName))]publicclassPerson{publicintPersonId {get;set; }publicstringFirstName {get;set; }publicstringLastName {get;set; } } Indexes over multiple columns, also known ascomposite indexes, speed up queries which filter on index's columns, but also queries wh...
Observed - EF Core mapper doesn't support multiple columns with same name even if they belong to different tables. It was working with Entity framework. Method in EF Core code where it fails public static int[] BuildIndexMap([CanBeNull] IReadOnlyList<string> columnNames, [NotNull] DbData...
using ContosoUniversity.Models; using Microsoft.EntityFrameworkCore; namespace ContosoUniversity.Data { public class SchoolContext : DbContext { public SchoolContext(DbContextOptions<SchoolContext> options) : base(options) { } public DbSet<Course> Courses { get; set; } public DbSet<Enrollment> Enro...
Previously, only one index could be defined over a given set of properties. The database name of an index was configured using IndexBuilder.HasName. New behavior Multiple indexes are now allowed on the same set or properties. These indexes are now distinguished by a name in the model. By ...
If ordering by more than one column, an index over those multiple columns can be defined; this is called a composite index.For more information, see the documentation page on indexes.Additional resourcesTo learn more about the shortcomings of offset-based pagination and about keyset pagination, ...
IndexAttribute can also be used to specify an index spanning multiple columns. For example: Copy [Index(nameof(FirstName), nameof(LastName), IsUnique = true)] public class User { public int Id { get; set; } [MaxLength(64)] public string FirstName { get; set; } [MaxLength(64)] publ...
project, which is a .NET Core app, so I’m using the CLI migrations command, “dotnet ef migrations add init.” The resulting migration file contains all of the usual CreateTable and other relevant logic, followed by code to insert the new data, specifying the table name, columns and ...
Before using JSON-based primitive collections, carefully consider indexing and query performance. Most database allow indexing at least some forms of querying into JSON documents; but arbitrary, complex queries such as the intersect above would likely not be able to use an index. In some cases, ...
Naming Conventions for Entity Framework Core Tables and Columns By default, EF Core will map to tables and columns named exactly after your .NET classes and properties. For example, mapping a typical Customer class to PostgreSQL will result in SQL such as the following: ...
project, which is a .NET Core app, so I’m using the CLI migrations command, “dotnet ef migrations add init.” The resulting migration file contains all of the usual CreateTable and other relevant logic, followed by code to insert the new data, specifying the table name, columns and ...