/// <summary>
/// 取参照实体的最大order值。
/// </summary>
/// <param name="bag"></param>
/// <param name="mode"></param>
/// <param name="offset"></param>
/// <param name="isolation"></param>
/// <returns></returns>
private int GetNewOrderNumber(EntityTreeUpdatingBag bag, EntityTreePosition mode, int offset = 0, Expression <Func <TEntity> > isolation = null)
{
if (bag == null)
{
return(GetNewOrderNumber(isolation));
}
switch (mode)
{
case EntityTreePosition.Children:
var sql = string.Format("SELECT MAX({0}) FROM {1} WHERE {2} LIKE {3}",
GetOrderExpression(),
DbUtility.FormatByQuote(syntax, metadata.TableName),
QuoteColumn(metaTree.InnerSign),
syntax.FormatParameter("pm"));
var innerId = bag.InnerId;
var parameters = new ParameterCollection {
{ "pm", innerId + new string('_', metaTree.SignLength) }
};
return(database.ExecuteScalar((SqlCommand)sql, parameters).To <int>() + 1 + offset);
case EntityTreePosition.Before:
return(bag.Order + offset);
case EntityTreePosition.After:
return(bag.Order + 1 + offset);
}
return(0);
}
/// <summary>
/// 使用 <see cref="EntityTreeUpdatingBag"/> 判断是否具有兄弟关系。
/// </summary>
/// <param name="bag1"></param>
/// <param name="bag2"></param>
/// <returns></returns>
private bool IsBrotherly(EntityTreeUpdatingBag bag1, EntityTreeUpdatingBag bag2)
{
if ((bag1.InnerId.Length != bag2.InnerId.Length) || bag2.InnerId.Length < metaTree.SignLength)
{
return(false);
}
return(bag1.InnerId.Substring(0, bag1.InnerId.Length - metaTree.SignLength)
.Equals(bag2.InnerId.Substring(0, bag2.InnerId.Length - metaTree.SignLength)));
}
/// <summary>
/// 从 <see cref="IEntity"/> 中解析出各个树属性。
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
private EntityTreeUpdatingBag ParseEntityData(IEntity entity)
{
var data = new EntityTreeUpdatingBag
{
InnerId = (string)entity.GetValue(metaTree.InnerSign),
};
if (metaTree.Order != null)
{
data.Order = (int)entity.GetValue(metaTree.Order);
}
else if (!string.IsNullOrEmpty(data.InnerId))
{
data.Order = int.Parse(data.InnerId.Right(metaTree.SignLength));
}
if (metaTree.Level != null)
{
data.Level = (int)entity.GetValue(metaTree.Level);
}
else if (!string.IsNullOrEmpty(data.InnerId))
{
data.Level = data.InnerId.Length / metaTree.SignLength;
}
if (metaTree.Name != null)
{
data.Name = (string)entity.GetValue(metaTree.Name);
}
if (metaTree.FullName != null)
{
data.FullName = (string)entity.GetValue(metaTree.FullName);
}
return(data);
}