/// <summary>
/// 获取插入或更新所参照的实体。
/// </summary>
/// <param name="instances"></param>
/// <param name="batchOpt"></param>
/// <returns></returns>
internal static List <string> GetModifiedProperties(Expression instances, BatchOperateOptions batchOpt)
{
if (!(instances is ConstantExpression consExp) || !(consExp.Value is IEnumerable entities))
{
return(null);
}
var maxProperties = new List <string>();
Type entityType = null;
IEnumerable <IProperty> properties = null;
//循环列表查找属性修改最多的那个实体作为参照
foreach (IEntity entity in entities)
{
if (entityType == null)
{
entityType = entity.GetType();
properties = PropertyUnity.GetPersistentProperties(entityType)
.Where(p => !p.Info.IsPrimaryKey ||
(p.Info.IsPrimaryKey && p.Info.GenerateType == IdentityGenerateType.None))
.ToList();
}
//判断实体类型有是不是编译的代理类型，如果不是，取非null的属性，否则使用IsModified判断
var isNotCompiled = entityType.IsNotCompiled();
var modified = isNotCompiled ?
properties.Where(p => !PropertyValue.IsEmpty(entity.GetValue(p))).Select(p => p.Name).ToArray() :
entity.GetModifiedProperties();
modified.Where(s => !maxProperties.Contains(s)).ForEach(s => maxProperties.Add(s));
if (batchOpt == null || batchOpt.CheckModifiedKinds == BatchCheckModifiedKinds.First)
{
break;
}
}
return(maxProperties);
}
/// <summary>
/// 异步的，对实体集合进行批量操作。
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="instances"></param>
/// <param name="fnOperation"></param>
/// <param name="cancellationToken">取消操作的通知。</param>
/// <returns>影响的实体数。</returns>
public async Task <int> BatchAsync(IEnumerable <TEntity> instances, Expression <Func <IRepository <TEntity>, TEntity, int> > fnOperation, BatchOperateOptions batchOpt, CancellationToken cancellationToken = default)
{
throw new NotImplementedException();
}
/// <summary>
/// 对实体集合进行批量操作。
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="instances"></param>
/// <param name="fnOperation"></param>
/// <returns>影响的实体数。</returns>
public int Batch(IEnumerable <TEntity> instances, Expression <Func <IRepository <TEntity>, TEntity, int> > fnOperation, BatchOperateOptions batchOpt)
{
throw new NotImplementedException();
}