Question

如何使用流利的api添加外键？

例如

model1

id，名称，model2.id

model2

id，姓名

我已经读过select来建立一对一的关系，但是此示例显示model1仅引用了model2。

Answer 1

我创建了一个演示，其下的model1为Employee，model2为Department，Employee引用了Department

型号：

public class Employee
{
    [Key]
    public int Id { get; set; }
    public string Name { get; set; }

    public int DepartmentId { get; set; }
    public Department Department { get; set; }
}

public class Department
{
    [Key]
    public int Id { get; set; }
    public string Name { get; set; }

}

dcContext：

protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);

        builder.Entity<Employee>()
        .HasOne(e => e.Department)
        .WithOne()
        .HasForeignKey<Employee>(e => e.DepartmentId);

    }

结果：

migrationBuilder.CreateTable(
            name: "Employees",
            columns: table => new
            {
                Id = table.Column<int>(nullable: false)
                    .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
                Name = table.Column<string>(nullable: true),
                DepartmentId = table.Column<int>(nullable: false)
            },
            constraints: table =>
            {
                table.PrimaryKey("PK_Employees", x => x.Id);
                table.ForeignKey(
                    name: "FK_Employees_Department_DepartmentId",
                    column: x => x.DepartmentId,
                    principalTable: "Department",
                    principalColumn: "Id",
                    onDelete: ReferentialAction.Cascade);
            })

当只有model1引用其他模型时，如何使用Fluent API添加外键？

1 个答案: