关系数据库元数据处理类(一) 创建元数据实体

 /// <summary>
    /// 数据库
    /// </summary>
    public class Database
    {
        public string Name { get; set; }
    }

  /// 表
    /// </summary>
    public class Table
    {
        /// <summary>
        /// 所属数据库
        /// </summary>
        public string DatabaseName { get; set; }

        /// <summary>
        /// 数据库
        /// </summary>
        public Database Database { get; set; }

        /// <summary>
        /// 表名称
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// 说明
        /// </summary>
        public string Explain { get; set; }

    }

/// <summary>
    /// 字段
    /// </summary>
    public class Column
    {
        /// <summary>
        /// 所属表
        /// </summary>
        public string TableName { get; set; }

        /// <summary>
        /// 表
        /// </summary>
        public Table Table { get; set; }

        /// <summary>
        /// 名称
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// 是否是标知
        /// </summary>
        public bool IsMarke { get; set; }

        /// <summary>
        /// 是否主键
        /// </summary>
        public bool IsPrimarykey { get; set; }

        /// <summary>
        /// 类型
        /// </summary>        
        public string Type { get; set; }

        /// <summary>
        /// 字节数
        /// </summary>
        public int Bytes { get; set; }

        /// <summary>
        /// 长度
        /// </summary>
        public int Length { get; set; }

        /// <summary>
        /// 小数位数
        /// </summary>
        public int DecimalPlaces { get; set; }

        /// <summary>
        /// 是否允许空
        /// </summary>
        public bool IsNull { get; set; }

        /// <summary>
        /// 默认值
        /// </summary>
        public string DefaultValue { get; set; }

        /// <summary>
        /// 说明
        /// </summary>
        public string Explain { get; set; }
    }

 /// <summary>
    /// 表关系
    /// </summary>
    public class Relation
    {
        /// <summary>
        /// 主键表
        /// </summary>
        public Table PrimaryTable { get; set; }

        public string PrimaryTableName { get; set; }

        /// <summary>
        /// 外键表
        /// </summary>
        public Table ForeignTable { get; set; }

        public string ForeignTableName { get; set; }

        /// <summary>
        /// 外键字段
        /// </summary>
        public Column ForeignKey { get; set; }

        public string ForeignKeyName { get; set; }

        /// <summary>
        /// 主键字段
        /// </summary>
        public Column PrimaryKey { get; set; }

        public string PrimaryKeyName { get; set; }
    }