/// <summary>
/// 通过引用关系，来删除引用表中引用本对象的所有对象。
///
/// 一般情况下，子类可以在自己重写的 Submit 方法中调用此方法来先删除其它非级联有关系。
///
/// 注意，此方法暂时只会生成 SQL 删除引用表的对象，不主动处理更多的级联关系。（以后再实现。）
/// </summary>
/// <param name="entity">正在删除这个实体。</param>
/// <param name="refProperty">这个引用属性表示了需要删除的另一个实体到 <c>entity</c> 的引用关系。</param>
/// <param name="propertyOwner"><c>refProperty</c> 属性对应的拥有者实体类型。</param>
protected void DeleteRefInDb(Entity entity, IRefProperty refProperty, Type propertyOwner = null)
{
if (propertyOwner == null)
{
propertyOwner = refProperty.OwnerType;
}
var refRepo = RepositoryFactoryHost.Factory.FindByEntity(propertyOwner)
as EntityRepository;
refRepo.RdbDataProvider.DeleteRefInDbCore(entity, refProperty);
}
/// <summary>
/// 实现删除关联数据的逻辑。
/// </summary>
/// <param name="entity"></param>
/// <param name="refProperty"></param>
protected override void DeleteRefCore(Entity entity, IRefProperty refProperty)
{
var f = QueryFactory.Instance;
var table = f.Table(_dataProvider.Repository);
var where = f.Constraint(table.Column(refProperty.RefIdProperty), entity.Id);
using (var dba = _dataProvider.CreateDbAccesser())
{
_dataProvider.DbTable.Delete(dba, where);
}
}
/// <summary>
/// 通过引用关系，来删除引用表中引用本对象的所有对象。
///
/// 一般情况下，子类可以在自己重写的 Submit 方法中调用此方法来先删除其它非级联有关系。
///
/// 注意，此方法暂时只会生成 SQL 删除引用表的对象，不主动处理更多的级联关系。（以后再实现。）
/// </summary>
/// <param name="entity">正在删除这个实体。</param>
/// <param name="refProperty">这个引用属性表示了需要删除的另一个实体到 <c>entity</c> 的引用关系。</param>
/// <param name="propertyOwner"><c>refProperty</c> 属性对应的拥有者实体类型。</param>
protected void DeleteRef(Entity entity, IRefProperty refProperty, Type propertyOwner = null)
{
if (propertyOwner == null)
{
propertyOwner = refProperty.OwnerType;
}
var refRepo = RepositoryFactoryHost.Factory.FindByEntity(propertyOwner);
var saver = (refRepo.DataProvider as IRepositoryDataProviderInternal).DataSaver;
saver.DeleteRefCore(entity, refProperty);
}
private void DeleteRefInDbCore(Entity entity, IRefProperty refProperty)
{
var f = QueryFactory.Instance;
var table = f.Table(_repository);
var where = f.Constraint(table.Column(refProperty.RefIdProperty), entity.Id);
using (var dba = this.CreateDbAccesser())
{
this.DbTable.Delete(dba, where);
}
}
/// <summary>
/// 通过左数据源和右实体数据源，以及从左到右的引用属性，来构造一个连接。
/// </summary>
/// <param name="left">左实体数据源。</param>
/// <param name="right">右实体数据源。</param>
/// <param name="leftToRight">从左到右的引用属性。</param>
/// <returns></returns>
public IJoin Join(
ITableSource left,
ITableSource right,
IRefProperty leftToRight
)
{
var condition = this.Constraint(
left.Column(leftToRight),
right.Column(Entity.IdProperty)
);
var joinType = leftToRight.Nullable ? JoinType.LeftOuter : JoinType.Inner;
return(Join(left, right, condition, joinType));
}
private SqlTableSource AddJoinTable(ITableSource fkTable, IRefProperty parentRef, ITableSource pkTable, ITableSource joinTo)
{
var f = QueryFactory.Instance;
var joinType = parentRef.Nullable ? JoinType.LeftOuter : JoinType.Inner;
var query = this as IQuery;
query.From = f.Join(query.From, joinTo, f.Constraint(
fkTable.Column(parentRef.RefIdProperty),
pkTable.IdColumn
), joinType);
var refTableSource = new SqlTableSource
{
ForeignKeyTable = fkTable,
RefProperty = parentRef,
PrimaryKeyTable = pkTable,
};
_allJoinTables.Add(refTableSource);
return(refTableSource);
}
public IPropertyQuery JoinRef(IRefProperty property, Type propertyOwner = null)
{
if (propertyOwner == null)
{
propertyOwner = property.OwnerType;
}
if (_refItems == null)
{
_refItems = new List <RefTableProperty>(2);
}
if (_refItems.All(i => i.RefProperty != property.RefIdProperty || i.PropertyOwner != propertyOwner))
{
var item = new RefTableProperty(property.RefIdProperty, propertyOwner)
{
JoinRefType = JoinRefType.JoinOnly
};
_refItems.Add(item);
}
return(this);
}
/// <summary>
/// 对实体列表中每一个实体都贪婪加载出它的所有引用实体。
/// </summary>
/// <param name="list"></param>
/// <param name="refProperty">贪婪加载的引用属性。</param>
/// <param name="eagerLoadProperties">所有还需要贪婪加载的属性。</param>
private void EagerLoadRef(EntityList list, IRefProperty refProperty, List <ConcreteProperty> eagerLoadProperties)
{
var refIdProperty = refProperty.RefIdProperty;
//查询一个大的实体集合，包含列表中所有实体所需要的所有引用实体。
var idList = new List <object>(10);
list.EachNode(e =>
{
var refId = e.GetRefNullableId(refIdProperty);
if (refId != null && idList.All(id => !id.Equals(refId)))
{
idList.Add(refId);
}
return(false);
});
if (idList.Count > 0)
{
var targetRepo = RepositoryFactoryHost.Factory.FindByEntity(refProperty.RefEntityType);
var allRefList = targetRepo.GetByIdList(idList.ToArray());
//继续递归加载它的贪婪属性。
this.EagerLoad(allRefList, eagerLoadProperties);
//把大的实体集合，根据 Id，设置到每一个实体上。
var refEntityProperty = refProperty.RefEntityProperty;
list.EachNode(entity =>
{
var refId = entity.GetRefNullableId(refIdProperty);
if (refId != null)
{
var refEntity = allRefList.Find(refId);
entity.LoadProperty(refEntityProperty, refEntity);
}
return(false);
});
}
}
/// <summary> /// 子类重写此方法，实现 <see cref="DeleteRef(Entity, IRefProperty, Type)" /> 的具体逻辑。 /// </summary> /// <param name="entity"></param> /// <param name="refProperty"></param> protected abstract void DeleteRefCore(Entity entity, IRefProperty refProperty);
protected override void DeleteRefCore(Entity entity, IRefProperty refProperty)
{
var f = QueryFactory.Instance;
var table = f.Table(_dataProvider.Repository);
var where = f.Constraint(table.Column(refProperty.RefIdProperty), entity.Id);
using (var dba = _dataProvider.CreateDbAccesser())
{
_dataProvider.DbTable.Delete(dba, where);
}
}
/// <summary>
/// 通过引用关系，来删除引用表中引用本对象的所有对象。
///
/// 一般情况下，子类可以在自己重写的 Submit 方法中调用此方法来先删除其它非级联有关系。
///
/// 注意，此方法暂时只会生成 SQL 删除引用表的对象，不主动处理更多的级联关系。（以后再实现。）
/// </summary>
/// <param name="entity">正在删除这个实体。</param>
/// <param name="refProperty">这个引用属性表示了需要删除的另一个实体到 <c>entity</c> 的引用关系。</param>
/// <param name="propertyOwner"><c>refProperty</c> 属性对应的拥有者实体类型。</param>
protected void DeleteRef(Entity entity, IRefProperty refProperty, Type propertyOwner = null)
{
if (propertyOwner == null) propertyOwner = refProperty.OwnerType;
var refRepo = RepositoryFactoryHost.Factory.FindByEntity(propertyOwner);
var saver = (refRepo.DataProvider as IRepositoryDataProviderInternal).DataSaver;
saver.DeleteRefCore(entity, refProperty);
}
/// <summary> /// 子类重写此方法，实现 <see cref="DeleteRef"/> 的具体逻辑。 /// </summary> /// <param name="entity"></param> /// <param name="refProperty"></param> protected abstract void DeleteRefCore(Entity entity, IRefProperty refProperty);
protected override void DeleteRefCore(Entity entity, IRefProperty refProperty)
{
throw new NotImplementedException();
}
internal bool IsRefLoadedOrAssigned(IRefProperty refProperty)
{
var value = this.GetProperty(refProperty.RefEntityProperty);
return(value != null);
}
public static IJoin Join(this ISource left, ITableSource right, IRefProperty leftToRight)
{
return(QueryFactory.Instance.Join(left, right, leftToRight));
}
public IPropertyQuery JoinRef(IRefProperty property, Type propertyOwner = null)
{
if (propertyOwner == null) propertyOwner = property.OwnerType;
if (_refItems == null) { _refItems = new List<RefTableProperty>(2); }
if (_refItems.All(i => i.RefProperty != property.RefIdProperty || i.PropertyOwner != propertyOwner))
{
var item = new RefTableProperty(property.RefIdProperty, propertyOwner)
{
JoinRefType = JoinRefType.JoinOnly
};
_refItems.Add(item);
}
return this;
}
protected override void DeleteRefCore(Entity entity, IRefProperty refProperty)
{
throw new NotImplementedException();
}
private SqlTableSource AddJoinTable(ITableSource fkTable, IRefProperty parentRef, ITableSource pkTable, ITableSource joinTo)
{
var f = QueryFactory.Instance;
var joinType = parentRef.Nullable ? JoinType.LeftOuter : JoinType.Inner;
var query = this as IQuery;
query.From = f.Join(query.From, joinTo, f.Constraint(
fkTable.Column(parentRef.RefIdProperty),
pkTable.IdColumn
), joinType);
var refTableSource = new SqlTableSource
{
ForeignKeyTable = fkTable,
RefProperty = parentRef,
PrimaryKeyTable = pkTable,
};
_allJoinTables.Add(refTableSource);
return refTableSource;
}
/// <summary>
/// 对实体列表中每一个实体都贪婪加载出它的所有引用实体。
/// </summary>
/// <param name="list"></param>
/// <param name="refProperty">贪婪加载的引用属性。</param>
/// <param name="eagerLoadProperties">所有还需要贪婪加载的属性。</param>
private void EagerLoadRef(EntityList list, IRefProperty refProperty, List <ConcreteProperty> eagerLoadProperties)
{
var refIdProperty = refProperty.RefIdProperty;
//查询一个大的实体集合，包含列表中所有实体所需要的所有引用实体。
var idList = new List <object>(10);
list.EachNode(e =>
{
var refId = e.GetRefNullableId(refIdProperty);
if (refId != null && idList.All(id => !id.Equals(refId)))
{
idList.Add(refId);
}
return(false);
});
if (idList.Count > 0)
{
var targetRepo = RepositoryFactoryHost.Factory.FindByEntity(refProperty.RefEntityType);
var refList = targetRepo.GetByIdList(idList.ToArray());
//继续递归加载它的贪婪属性。
this.EagerLoad(refList, eagerLoadProperties);
#region 把实体全部放到排序列表中
//由于数据量可能较大，所以需要进行排序后再顺序加载。
IList <Entity> sortedList = null;
if (_repository.SupportTree)
{
var tmp = new List <Entity>(list.Count);
list.EachNode(p =>
{
tmp.Add(p);
return(false);
});
sortedList = tmp.OrderBy(e => e.GetRefNullableId(refIdProperty)).ToList();
}
else
{
sortedList = list.OrderBy(e => e.GetRefNullableId(refIdProperty)).ToList();
}
#endregion
#region 使用一次主循环就把所有的子实体都加载到父实体中。
//一次循环就能完全加载的前提是因为父集合按照 Id 排序，子集合按照父 Id 排序。
//把大的实体集合，根据 Id，设置到每一个实体上。
var refEntityProperty = refProperty.RefEntityProperty;
int refListIndex = 0, refListCount = refList.Count;
var refEntity = refList[refListIndex];
for (int i = 0, c = sortedList.Count; i < c; i++)
{
var entity = sortedList[i];
var refId = entity.GetRefNullableId(refIdProperty);
if (refId != null)
{
//必须把该对象处理完成后，才能跳出下面的循环。
while (true)
{
if (object.Equals(refId, refEntity.Id))
{
entity.LoadProperty(refEntityProperty, refEntity);
break;
}
else
{
//检测下一个引用实体。
refListIndex++;
//所有父集合已经加载完毕，退出整个循环。
if (refListIndex >= refListCount)
{
i = c;
break;
}
refEntity = refList[refListIndex];
}
}
}
}
#endregion
}
}
public static IJoin Join(this ISource left, ITableSource right, IRefProperty leftToRight)
{
return QueryFactory.Instance.Join(left, right, leftToRight);
}
