Merging Tables/Files

Question

I am using entity framework code first and mapping our unidata files to tables to get data. I am wanting to join the tables or use navigation properties. The 2 tables share a common field called WorkInProgressOperationId. I have tried using join and navigation properties but it does not seem to work when mapping to unidata files.Is this possible?

        public class WorkInProgressMapping : EntityTypeConfiguration<WorkInProgress>
{

    public WorkInProgressMapping()
    {          
        this.ToTable("WIPMASTER");
        this.HasKey(e => e.WorkInProgressId).Ignore(e => e.EntityId);           
        this.Property(e => e.WorkInProgressId).HasColumnName("@ID");
        this.Property(e => e.SequenceNumber).HasColumnName("OPER_SEQ_NBR");
        this.Property(e => e.WorkOrderNumber).HasColumnName("WORK_ORDER");
        this.Property(e => e.StartQuantity).HasColumnName("SCHED_COMP_QTY");
        this.Property(e => e.JobNumber).HasColumnName("JOB_NBR");
        this.Property(e => e.JobDetailId).HasColumnName("JOBDET_ID");
        this.Property(e => e.ComputerGeneratedNumber).HasColumnName("CPN");
        this.Property(e => e.ItemNumber).HasColumnName("ITEM_NBR");
        this.Property(e => e.ParentWorkOrder).HasColumnName("PARENT_WO");
        this.Property(e => e.ParentDueDate).HasColumnName("SCHED_COMP_DATE");
        this.Property(e => e.WorkOrderIssueDate).HasColumnName("RELEASE_DATE");
        this.Property(e => e.WorkInProgressOperationId).HasColumnName("WIPOPERACT_ID");
    }
}

        public class WorkInProgressOperationMapping : EntityTypeConfiguration<WorkInProgressOperation>
{

    public WorkInProgressOperationMapping()
    {
       this.ToTable("WIPOPER");
       this.HasKey(e => e.WorkInProgressOperationId).Ignore(e => e.EntityId);
       this.Property(e => e.WorkInProgressOperationId).HasColumnName("@ID");
       this.Property(e => e.OperationNumber).HasColumnName("OPERATION_NBR");
       this.Property(e => e.OperationSequence).HasColumnName("OPER_SEQ");
       this.Property(e => e.WorkOrder).HasColumnName("WORK_ORDER");
       this.Property(e => e.NextSequence).HasColumnName("NEXT_SEQ");
       this.Property(e => e.Status).HasColumnName("OPER_STATUS");
       this.Property(e => e.QuantityComplete).HasColumnName("QTY_COMPLETE");
       this.Property(e => e.SalesOrderDeliveryDate).HasColumnName("DUE_SO");
       this.Property(e => e.WorkOrderDeliveryDate).HasColumnName("WO_DUE");
       this.Property(e => e.StartingQuantity).HasColumnName("EXP_START_QTY");

    }
}

Answer 1

I was able to put navigation property between two UniData Tables. I have used Composite Key/Foreign Key. Is this your requirement?

See Example below.

I have used the following:

U2 Database

• UniData 7.3
• Demo account with STUDENT_NF_SUB and STUDENT_CGA_MV_SUB tables
• Demo account is normalized with VSG

Microsoft

• Visual Studio 2012 Update 4
• .NET Framework 4.5
• Entity Framework 5.0 (Install-Package Entity Framework -Version 5.0.0)
• Code First Model
• WinFrom App

UniData Table in Server Explorer

See below Unidata tables in Visual Studio 2012’s Server Explore.

Model and DbContext Code

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Test_EF5
{
    public class Student
    {
        public string StudentID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public virtual ICollection<StudentSemester> Semesters { get; set; }
    }

    public class StudentSemester
    {
        public string StudentID { get; set; }
        public string Semester { get; set; }
        public int CompositeKey { get; set; }
        public virtual Student Student { get; set; }
    }
    public class StudentMapping : EntityTypeConfiguration<Student>
    {
        public StudentMapping()
        {
            this.ToTable("STUDENT_NF_SUB");
            this.Property(e => e.StudentID).HasColumnName("ID");
            this.Property(e => e.FirstName).HasColumnName("FNAME");
            this.Property(e => e.LastName).HasColumnName("LNAME");
            this.HasKey(e => e.StudentID);
        }

    }

    public class StudentSemesterMapping : EntityTypeConfiguration<StudentSemester>
    {
        public StudentSemesterMapping()
        {
            this.ToTable("STUDENT_CGA_MV_SUB");
            this.Property(e => e.StudentID).HasColumnName("ID");
            this.Property(e => e.Semester).HasColumnName("SEMESTER");
            this.Property(e => e.CompositeKey).HasColumnName("CGA_MV_KEY");
            this.HasKey(e => new { e.StudentID, e.CompositeKey });

        }

    }
    public class StudentContext : DbContext
    {
        public StudentContext()
        {

        }
        public DbSet<Student> Students { get; set; }
        public DbSet<StudentSemester> StudentSemesters { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Configurations.Add(new StudentMapping());
            modelBuilder.Configurations.Add(new StudentSemesterMapping());

        }
    }
}

WinForm App to call the Code First with Navigation Property

private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                Database.SetInitializer<StudentContext>(null);
                StudentContext ctx = new StudentContext();
                var r = ctx.Students.ToList();
                foreach (var item in r)
                {
                    this.textBox1.AppendText("ID="+item.StudentID+" FNAME=" + item.FirstName +" LNAME="+ item.LastName +Environment.NewLine);

                    foreach (var item2 in item.Semesters)
                    {
                        this.textBox1.AppendText("\t ID="+item2.StudentID + " Semester="+item2.Semester +" CompositeKey="+ item2.CompositeKey +Environment.NewLine);
                    }
                }
            }
            catch (Exception e4)
            {
                string lErr = e4.Message;
                this.textBox1.AppendText(lErr);
            }

        }

Run the App

Answer 2

Another Example : One to Many Relation (U2 Tables/Files)

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Test_EF5
{


    public class Customer
    {
        public string CustomerID { get; set; }
        public string FirstName { get; set; }

        public virtual ICollection<Rental> Rentals { get; set; }
    }

    public class Rental
    {
        public string RentalID { get; set; }
        public string CustomerID { get; set; }
        public decimal Balance { get; set; }
        public virtual Customer Customer { get; set; }
    }

    public class CustomerMapping : EntityTypeConfiguration<Customer>
    {
        public CustomerMapping()
        {
            this.ToTable("MEMBERS");
            this.Property(e => e.CustomerID).HasColumnName("MEMBERS_PK");
            this.Property(e => e.FirstName).HasColumnName("FIRST_NAME");
            this.HasKey(e => e.CustomerID);
        }

    }

    public class RentalMapping : EntityTypeConfiguration<Rental>
    {
        public RentalMapping()
        {
            this.ToTable("RENTAL_DETAILS");
            this.Property(e => e.RentalID).HasColumnName("RENTAL_DETAIL_PK");
            this.Property(e => e.Balance).HasColumnName("BALANCE.DUE");
            this.Property(e => e.CustomerID).HasColumnName("CUSTOMER.CODE");


            this.HasKey(e => new { e.RentalID });
            HasRequired(p => p.Customer)
                .WithMany(b => b.Rentals)
                .HasForeignKey(p => new { p.CustomerID });

        }

    }

    public class CustomerContext : DbContext
    {
        public CustomerContext()
        {

        }
        public DbSet<Customer> Customers { get; set; }
        public DbSet<Rental> Rentals { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Configurations.Add(new CustomerMapping());
            modelBuilder.Configurations.Add(new RentalMapping());

        }
    }
}

Answer 3

Eager Loading with Include() function

private void button3_Click(object sender, EventArgs e)
        {


            try
            {
                Database.SetInitializer<CustomerContext>(null);
                CustomerContext ctx = new CustomerContext();
                var r = ctx.Customers.Include("Rentals").ToList();
                foreach (var item in r)
                {
                    this.textBox1.AppendText("ID=" + item.CustomerID + " FNAME=" + item.FirstName + Environment.NewLine);
                    int k = 0;
                    foreach (var item2 in item.Rentals)
                    {
                        this.textBox1.AppendText("\t ID=" + item2.RentalID + " CustomerID=" + item2.CustomerID + " Balance=" + item2.Balance + Environment.NewLine);

                    }
                }

                int y = 0;
            }
            catch (Exception e4)
            {
                string lErr = e4.Message;
                this.textBox1.AppendText(lErr);
            }

        }