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1. 在oracle数据库里建一个表

   CREATE TABLE student (
       num int not null,
       name varchar2(200) not null,
       PRIMARY KEY(num)
    );
   

2. 通过vs studio2022建一个"控制台应用"类型的项目.
3. 通过vs studio上的nuget下载Oracle.EntityFrameworkCore,Microsoft.EntityFrameworkCore.Tools
4. 使用EF core的代码如下:

   using Microsoft.EntityFrameworkCore;
   using System.ComponentModel.DataAnnotations;
   using System.ComponentModel.DataAnnotations.Schema;
   namespace d0001_efc1
   {
       class Program
       {
           public class StudentContext : DbContext
           {
               public DbSet<Student>? Students { get; set; }
   
   
               protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
               {
                   optionsBuilder.UseOracle(@"User Id=test_user;Password=123456;Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=aaa)))");
               }
           }
           [Table("STUDENT")]
           public class Student
           {
               [Column("NUM")]
               [Key]
               public int num { get; set; }
               [Column("NAME")]
               public string? name { get; set; }
   
   
           static void Main(string[] args)
           {
               using (var db = new StudentContext())
               {
                   var student = new Student { num = 4, name = "张三" };
                   db.Students!.Add(student);
                   db.SaveChanges();
               }
   
               using (var db = new StudentContext())
               {
                   var blogs = db.Students;
                   foreach (var item in blogs!)
                   {
                       Console.WriteLine(item.name);
                           Console.WriteLine(item.num);
                           //Console.WriteLine(item.Url + " has rating " + item.Rating );
                       }
               }
               Console.ReadLine();
           }
       }
       }
   }
   

5. 参考资料
   oracle EF core官方demo