求解 使用EF 发现只创建了数据库，木有创建表,该如何处理

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ComponentModel.DataAnnotations;namespace DataEntity{    [Table("Sys_Menu")]    public class Menu    {        [Key]        [Display(Name = "菜单编号")]        [Column(Order = 0)]        [Required(ErrorMessage = "菜单编号必须提供")]        public int MenuID { get; set; }        [Display(Name = "菜单名称")]        [Column(Order = 1)]        [Required(ErrorMessage = "菜单名称必须提供")]        [StringLength(50, ErrorMessage = "不能超过50个字符")]        public string MenuName { get; set; }        [Display(Name = "排序号")]        [Column(Order = 2)]        [Required(ErrorMessage = "排序号必须提供")]        [MaxLength(3, ErrorMessage = "排序号长度不能超过3位")]        public int OrderCode { get; set; }        [Display(Name = "访问地址")]        [Column(Order = 3)]        [StringLength(100, ErrorMessage = "访问地址不能超过100个字符")]        public string Url { get; set; }        [Display(Name = "父菜单")]        [Column(Order = 4)]        [Required(ErrorMessage = "父菜单必须提供")]        public int ParentID { get; set; }        /// <summary>        /// 1个菜单有1个或多个功能点        /// </summary>        public virtual ICollection<Function> Functions { get; set; }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ComponentModel.DataAnnotations;namespace DataEntity{    [Table("Sys_Function")]    public class Function    {        /// <summary>        /// 主键ID        /// </summary>        [Key]        public int FunctionID        {            get;            set;        }        /// <summary>        /// 模块ID        /// </summary>        public int MenuID        {            get;            set;        }        /// <summary>        /// 功能编码        /// </summary>        public string FunctionCode        {            get;            set;        }        /// <summary>        /// 功能名称        /// </summary>        public string FunctionName        {            get;            set;        }        /// <summary>        /// 功能点对应的菜单实体        /// </summary>        [ForeignKey("MenuID")]        public virtual Menu Menu { get; set; }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ComponentModel.DataAnnotations;namespace DataEntity{    [Table("Sys_User")]    public class User    {        [Key]        [Display(Name = "用户编号")]        [Column(Order = 0)]        public int UserID { get; set; }                [Display(Name = "用户名")]        [Column(Order = 1)]        [Required(ErrorMessage = "用户名必须提供")]        [StringLength(50, ErrorMessage = "不能超过50个字符")]        public string UserName { get; set; }        [Display(Name = "用户姓名")]        [Column(Order = 2)]        [Required(ErrorMessage = "用户姓名必须提供")]        [StringLength(50, ErrorMessage = "不能超过50个字符")]        public string RealName { get; set; }        [Display(Name = "密码")]        [Column(Order = 3)]        [Required(ErrorMessage = "登录密码必须提供")]        [StringLength(50, ErrorMessage = "不能超过50个字符")]        [DataType(DataType.Password)]        public string Password { get; set; }        [Display(Name = "性别")]        [Column(Order = 4)]        [Required(ErrorMessage = "性别必须提供")]        [StringLength(1, ErrorMessage = "不能超过1个字符")]        public string Sex { get; set; }    }}