Umbraco-CMS/src/Umbraco.Infrastructure/Persistence/DatabaseAnnotations/PrimaryKeyColumnAttribute.cs

using System;

namespace Umbraco.Core.Persistence.DatabaseAnnotations
{
    /// <summary>
    /// Attribute that represents a Primary Key
    /// </summary>
    /// <remarks>
    /// By default, Clustered and AutoIncrement is set to true.
    /// </remarks>
    [AttributeUsage(AttributeTargets.Property)]
    public class PrimaryKeyColumnAttribute : Attribute
    {
        public PrimaryKeyColumnAttribute()
        {
            Clustered = true;
            AutoIncrement = true;
        }

        /// <summary>
        /// Gets or sets a boolean indicating whether the primary key is clustered.
        /// </summary>
        /// <remarks>Defaults to true</remarks>
        public bool Clustered { get; set; }

        /// <summary>
        /// Gets or sets a boolean indicating whether the primary key is auto incremented.
        /// </summary>
        /// <remarks>Defaults to true</remarks>
        public bool AutoIncrement { get; set; }

        /// <summary>
        /// Gets or sets the name of the PrimaryKey.
        /// </summary>
        /// <remarks>
        /// Overrides the default naming of a PrimaryKey constraint:
        /// PK_tableName
        /// </remarks>
        public string Name { get; set; }

        /// <summary>
        /// Gets or sets the names of the columns for this PrimaryKey.
        /// </summary>
        /// <remarks>
        /// Should only be used if the PrimaryKey spans over multiple columns.
        /// Usage: [nodeId], [otherColumn]
        /// </remarks>
        public string OnColumns { get; set; }

        /// <summary>
        /// Gets or sets the Identity Seed, which is used for Sql Ce databases.
        /// </summary>
        /// <remarks>
        /// We'll only look for changes to seeding and apply them if the configured database
        /// is an Sql Ce database.
        /// </remarks>
        public int IdentitySeed { get; set; }
    }
}