/// <summary>
/// 是否是外键
/// </summary>
/// <param name="entity"></param>
/// <param name="member"></param>
/// <returns></returns>
public virtual bool IsForeignKey(MappingEntity entity, MemberInfo member)
{
return member.GetAttributeValue<NkjSoft.ORM.Data.Mapping.AssociationAttribute, bool>(p => p.IsForeignKey);
}
/// <summary>
/// Determines if a property can be part of an update operation
/// </summary>
/// <param name="entity"></param>
/// <param name="member"></param>
/// <returns></returns>
public virtual bool IsUpdatable(MappingEntity entity, MemberInfo member)
{
//return !this.IsPrimaryKey(entity, member);
//TODO: 2010-7-17 返回指定字段成员是否参与 Insert 或 Update 操作
return member.GetAttributeValue<ColumnAttribute, bool>(p => p.InsertOrUpdatable);
}
/// <summary>
/// Determines if a property is generated on the server during insert
/// </summary>
/// <param name="entity">The entity.</param>
/// <param name="member">The member.</param>
/// <returns>
/// <c>true</c> if the specified entity is generated; otherwise, <c>false</c>.
/// </returns>
public virtual bool IsIdentity(MappingEntity entity, MemberInfo member)
{
bool isOk = member.GetAttributeValue<ColumnAttribute, bool>(p => p.IsIdentity);
return isOk;
//return entity.GetAttribute<bool>(member, m => m.IsGenerated);
}
/// <summary>
/// Determines if a property is computed after insert or update
/// </summary>
/// <param name="entity">The entity.</param>
/// <param name="member">The member.</param>
/// <returns>
/// <c>true</c> if the specified entity is computed; otherwise, <c>false</c>.
/// </returns>
public virtual bool IsComputed(MappingEntity entity, MemberInfo member)
{
return member.GetAttributeValue<ColumnAttribute, bool>(p => p.IsComputed);
//return entity.GetAttribute<bool>(member, m => m.IsComputed);
}
/// <summary>
/// Determines if a property represents or is part of the entities unique identity (often primary key)
/// </summary>
/// <param name="entity"></param>
/// <param name="member"></param>
/// <returns></returns>
public override bool IsPrimaryKey(MappingEntity entity, MemberInfo member)
{
return member.GetAttributeValue<ColumnAttribute, bool>(p => p.IsPrimaryKey);
//return entity.GetAttribute<bool>(member, m => m.IsPrimaryKey);
//Type entityType = entity.EntityType;
////TODO:最终,在这个位置去掉Insert 语句中,对象成员标记了 自动增长的特性的属性..将不参与 Insert 操作 s
//object[] cas = member.GetCustomAttributes(typeof(Mapping.ColumnAttribute), false);
//if (cas.Length == 1)
//{
// ColumnAttribute ca = cas[0] as ColumnAttribute;
// return ca.IsPrimaryKey;
//}
//return false;
}
/// <summary>
/// The type declaration for the column in the provider's syntax
/// </summary>
/// <param name="entity"></param>
/// <param name="member"></param>
/// <returns>a string representing the type declaration or null</returns>
public virtual string GetColumnDbType(MappingEntity entity, MemberInfo member)
{
return member.GetAttributeValue<ColumnAttribute, string>(p => p.DbType);
//return entity.GetAttribute<string>(member, m => m.DbType);
//return null;
}
