实体框架数据库首先生成不正确的模型

时间：2015-08-03 16:24:37

标签： entity-framework ef-code-first ef-database-first

过去几天我一直遇到实体框架的问题，我在周末发布了一个问题，我认为这是我的问题，但事实证明，我认为这是我的模型或实体框架本身。所以，我首先尝试创建最能描述我的实体应该如何定义的模型类，然后让EF为我生成数据库。在大多数情况下，它做对了，直到我添加了另一个与另一个相关的类，并且它发出了关于级联删除的警告。感谢@Florian Haider，他指示我如何告诉EF禁用级联删除。但同样，这并不能解决我的实际问题。我相信我的模型或数据库是不正确的。

这个问题旨在描述我在VS2015中从数据库创建数据模型时遇到的问题，我认为它应该在相反的方向上创建。所以这里：

我有下表：

CREATE TABLE [dbo].[AcademicYear](
    [ID] [uniqueidentifier] NOT NULL,
    [Name] [nvarchar](max) NULL,
    [BeginDate] [datetime] NOT NULL,
    [EndDate] [datetime] NOT NULL,
    [SchoolID] [uniqueidentifier] NOT NULL,
    [CreateDate] [datetime] NOT NULL,
    [UpdateDate] [datetime] NULL,
    [Active] [bit] NOT NULL,
 CONSTRAINT [PK_AcademicYear] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

GO

ALTER TABLE [dbo].[AcademicYear] ADD  CONSTRAINT [DF_AcademicYear_ID]  DEFAULT (newid()) FOR [ID]
GO

ALTER TABLE [dbo].[AcademicYear] ADD  CONSTRAINT [DF_AcademicYear_CreateDate]  DEFAULT (getdate()) FOR [CreateDate]
GO

ALTER TABLE [dbo].[AcademicYear]  WITH CHECK ADD  CONSTRAINT [FK_AcademicYear_AcademicYear] FOREIGN KEY([SchoolID])
REFERENCES [dbo].[School] ([ID])
GO

ALTER TABLE [dbo].[AcademicYear] CHECK CONSTRAINT [FK_AcademicYear_AcademicYear]
GO

然后我有相关的表格：

CREATE TABLE [dbo].[School](
    [ID] [uniqueidentifier] NOT NULL,
    [Name] [nvarchar](256) NOT NULL,
    [MissionStatement] [nvarchar](1024) NULL,
    [AddressLine1] [nvarchar](1024) NOT NULL,
    [AddressLine2] [nvarchar](1024) NULL,
    [City] [nvarchar](256) NOT NULL,
    [StateCode] [nvarchar](256) NOT NULL,
    [PostalCode] [nvarchar](256) NOT NULL,
    [PhoneNumber] [nvarchar](256) NOT NULL,
    [FaxNumber] [nvarchar](256) NULL,
    [EmailAddress] [nvarchar](256) NULL,
    [WebsiteURL] [nvarchar](1024) NULL,
    [CurrentAcademicYearID] [uniqueidentifier] NULL,
    [EnrollmentAcademicYearID] [uniqueidentifier] NULL,
    [CreateDate] [datetime] NOT NULL,
    [UpdateDate] [datetime] NULL,
    [Active] [bit] NOT NULL,
 CONSTRAINT [PK_School] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[School] ADD  CONSTRAINT [DF_School_ID]  DEFAULT (newid()) FOR [ID]
GO

ALTER TABLE [dbo].[School] ADD  CONSTRAINT [DF_School_CreateDate]  DEFAULT (getdate()) FOR [CreateDate]
GO

ALTER TABLE [dbo].[School]  WITH CHECK ADD  CONSTRAINT [FK_School_AcademicYear] FOREIGN KEY([CurrentAcademicYearID])
REFERENCES [dbo].[AcademicYear] ([ID])
GO

ALTER TABLE [dbo].[School] CHECK CONSTRAINT [FK_School_AcademicYear]
GO

ALTER TABLE [dbo].[School]  WITH CHECK ADD  CONSTRAINT [FK_School_AcademicYear1] FOREIGN KEY([EnrollmentAcademicYearID])
REFERENCES [dbo].[AcademicYear] ([ID])
GO

ALTER TABLE [dbo].[School] CHECK CONSTRAINT [FK_School_AcademicYear1]
GO

在VS2015中创建实体数据模型后，生成的模型类如下所示......

学年：

[Table("AcademicYear")]
    public partial class AcademicYear
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public AcademicYear()
        {
            CellGroup = new HashSet<CellGroup>();
            FeeSchedule = new HashSet<FeeSchedule>();
            ParentEnrollment = new HashSet<ParentEnrollment>();
            ReportingPeriod = new HashSet<ReportingPeriod>();
            School1 = new HashSet<School>();
            School2 = new HashSet<School>();
            StudentEnrollment = new HashSet<StudentEnrollment>();
            VolunteerPosition = new HashSet<VolunteerPosition>();
        }

        public Guid ID { get; set; }

        public string Name { get; set; }

        public DateTime BeginDate { get; set; }

        public DateTime EndDate { get; set; }

        public Guid SchoolID { get; set; }

        public DateTime CreateDate { get; set; }

        public DateTime? UpdateDate { get; set; }

        public bool Active { get; set; }

        public virtual School School { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<CellGroup> CellGroup { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<FeeSchedule> FeeSchedule { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<ParentEnrollment> ParentEnrollment { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<ReportingPeriod> ReportingPeriod { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<School> School1 { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<School> School2 { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<StudentEnrollment> StudentEnrollment { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<VolunteerPosition> VolunteerPosition { get; set; }
    }

学校：

 [Table("School")]
    public partial class School
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public School()
        {
            AcademicYear = new HashSet<AcademicYear>();
            Parent = new HashSet<Parent>();
            Student = new HashSet<Student>();
        }

        public Guid ID { get; set; }

        [Required]
        [StringLength(256)]
        public string Name { get; set; }

        [StringLength(1024)]
        public string MissionStatement { get; set; }

        [Required]
        [StringLength(1024)]
        public string AddressLine1 { get; set; }

        [StringLength(1024)]
        public string AddressLine2 { get; set; }

        [Required]
        [StringLength(256)]
        public string City { get; set; }

        [Required]
        [StringLength(256)]
        public string StateCode { get; set; }

        [Required]
        [StringLength(256)]
        public string PostalCode { get; set; }

        [Required]
        [StringLength(256)]
        public string PhoneNumber { get; set; }

        [StringLength(256)]
        public string FaxNumber { get; set; }

        [StringLength(256)]
        public string EmailAddress { get; set; }

        [StringLength(1024)]
        public string WebsiteURL { get; set; }

        public Guid? CurrentAcademicYearID { get; set; }

        public Guid? EnrollmentAcademicYearID { get; set; }

        public DateTime CreateDate { get; set; }

        public DateTime? UpdateDate { get; set; }

        public bool Active { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<AcademicYear> AcademicYear { get; set; }

        public virtual AcademicYear AcademicYear1 { get; set; }

        public virtual AcademicYear AcademicYear2 { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Parent> Parent { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<Student> Student { get; set; }
    }

现在，就我个人而言，我认为该模型应如下所示......

学年：

 [Table("AcademicYear")]
    public class AcademicYear : BaseEntity 
    {
        public string Name { get; set; }

        [Required]
        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:MM-dd-yyyy}", ApplyFormatInEditMode = true)]
        public DateTime BeginDate { get; set; }

        [Required]
        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:MM-dd-yyyy}", ApplyFormatInEditMode = true)]
        public DateTime EndDate { get; set; }

        public virtual ICollection<ReportingPeriod> ReportingPeriods { get; set; }

        //public virtual ICollection<VolunteerPosition> VolunteerPositions { get; set; }

        public virtual ICollection<CellGroup> CellGroups { get; set; }

        public virtual ICollection<ParentEnrollment> ParentEnrollments { get; set; }

        public virtual ICollection<StudentEnrollment> StudentEnrollments { get; set; }
    }

学校：

 [Table("School")]
    public class School : BaseEntity
    {
        public string Name { get; set; }
        public string MissionStatement { get; set; }
        public string AddressLine1 { get; set; }
        public string AddressLine2 { get; set; }
        public string City { get; set; }
        public string StateCode { get; set; }
        public string PostalCode { get; set; }
        public string PhoneNumber { get; set; }
        public string FaxNumber { get; set; }
        public string EmailAddress { get; set; }
        public string WebsiteURL { get; set; }

        public Guid? CurrentAcademicYearID { get; set; }

        [ForeignKey("CurrentAcademicYearID")]
        public virtual AcademicYear CurrentAcademicYear { get; set; }

        public Guid? EnrollmentAcademicYearID { get; set; }

        [ForeignKey("EnrollmentAcademicYearID")]
        public virtual AcademicYear EnrollmentAcademicYear { get; set; }

        public virtual ICollection<Parent> Parents { get; set; }

        public virtual ICollection<Student> Students { get; set; }
    }

我错了吗？这是我的桌子或EF（或两者）的问题吗？ School1和School2的藏品来自哪里？

0 个答案:

没有答案
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