如何获取实体框架以查询正确的表？

Question

I've got a class defined

public class ReportClass
{
    public int ID { get; set; }
    public int ClassIndex { get; set; }
    public string ClassName { get; set; }
    public int CompanyID { get; set; }

}

and I set up a dbcontext.

public class ReportClassContext : DbContext
{
    public DbSet<ReportClass> ReportClasses { get; set; }
}

When I first went to get records, the runtime tells me the database table doesn't exist: I check, and I see that the name of my DbSet doesn't match with the table. I switched the name to match:

public class ReportClassContext : DbContext
{
    public DbSet<ReportClass> ReportClassesRealTable { get; set; }
}

but it is still querying against the non-existent table.

What am I doing wrong?

Answer 1

Use the table attribute like this:

[Table("ReportClassesRealTable")]
public class ReportClass
{
    public int ID { get; set; }
    public int ClassIndex { get; set; }
    public string ClassName { get; set; }
    public int CompanyID { get; set; }

}

This tells the EF what the actual table name is for your class, otherwise it attempts to use the plural form of your class name.

Answer 2

Let this be there as it is

public DbSet<ReportClass> ReportClasses { get; set; }

Now overrde the OnMoedlCreateing method to tell EF to map this class to a different table using fluent API . Add that method to your DBContext class

public class ReportClassContext : DbContext
{
    public DbSet<ReportClass> ReportClasses { get; set; }
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
      modelBuilder.Entity<ReportClass>().ToTable("ReportClassesRealTable");
    }
}

This tells EF that when you query ReportClasses property of your DbContxt object, It will fetch data from teh ReportClassRealTable table in your database.