work/Models/Database/newsContext.cs

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using System;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;

#nullable disable

namespace work.Models.Database
{
    public partial class newsContext : DbContext
    {
        public newsContext()
        {
        }

        public newsContext(DbContextOptions<newsContext> options)
            : base(options)
        {
        }

        public virtual DbSet<Admin> Admins { get; set; }
        public virtual DbSet<Article> Articles { get; set; }
        public virtual DbSet<Category> Categories { get; set; }
        public virtual DbSet<Comment> Comments { get; set; }
        public virtual DbSet<Permission> Permissions { get; set; }
        public virtual DbSet<User> Users { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
#warning To protect potentially sensitive information in your connection string, you should move it out of source code. You can avoid scaffolding the connection string by using the Name= syntax to read it from configuration - see https://go.microsoft.com/fwlink/?linkid=2131148. For more guidance on storing connection strings, see http://go.microsoft.com/fwlink/?LinkId=723263.
                optionsBuilder.UseSqlServer("Data Source=.;Initial Catalog=news;Integrated Security=SSPI");
            }
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.HasAnnotation("Relational:Collation", "Chinese_PRC_CI_AS");

            modelBuilder.Entity<Admin>(entity =>
            {
                entity.HasKey(e => new { e.Id, e.Username })
                    .HasName("PK_db_Admin");

                entity.ToTable("Admin");

                entity.Property(e => e.Id)
                    .ValueGeneratedOnAdd()
                    .HasColumnName("id");

                entity.Property(e => e.Username)
                    .HasMaxLength(20)
                    .HasColumnName("username");

                entity.Property(e => e.Classname)
                    .HasMaxLength(50)
                    .HasColumnName("classname");

                entity.Property(e => e.Password)
                    .IsRequired()