/// <summary>
/// 导出实体数据到内存数据库。如果当前实体操作失败，请检查导出事件的异常参数对象。
/// </summary>
/// <param name="funQ">获取导出数据的查询表达式委托方法，委托方法的参数为导出批次号；如果结果为空，导出实体全部数据</param>
/// <param name="initBatchNumber">要初始化导出批次号的函数</param>
public void Export(Func <int, T, OQL> funQ, Func <T, int> initBatchNumber)
{
Type entityType = typeof(T);
try
{
//导出批次管理
string exportTableName = EntityFieldsCache.Item(entityType).TableName;
List <ExportBatchInfo> batchList = MemDB.Get <ExportBatchInfo>();
ExportBatchInfo currBatch = batchList.FirstOrDefault(p => p.ExportTableName == exportTableName);
if (currBatch == null)
{
currBatch = new ExportBatchInfo();
currBatch.BatchNumber = initBatchNumber == null?1: initBatchNumber(new T());
currBatch.ExportTableName = exportTableName;
currBatch.LastExportDate = DateTime.Now;
// batchList.Add(currBatch);
MemDB.Add(currBatch);
}
else
{
currBatch.BatchNumber += 1;
currBatch.LastExportDate = DateTime.Now;
}
MemDB.Save <ExportBatchInfo>();
//导出数据
OQL q = funQ(currBatch.BatchNumber, new T());
List <T> entityList = q != null?CurrDbContext.QueryList <T>(q) : CurrDbContext.QueryAllList <T>();
ExportEntityEventArgs <T> args = new ExportEntityEventArgs <T>(entityList, entityType, exportTableName);
args.Succeed = true;
args.OperationExcepiton = null;
args.BatchNumber = currBatch.BatchNumber;
if (OnExported != null)
{
OnExported(this, args);
}
if (!args.Cancel)
{
SaveEntity(entityList.ToArray(), args);
}
}
catch (Exception ex)
{
ExportEntityEventArgs <T> args = new ExportEntityEventArgs <T>(null, entityType, EntityFieldsCache.Item(entityType).TableName);
args.Succeed = false;
args.OperationExcepiton = ex;
if (OnExported != null)
{
OnExported(this, args);
}
}
}
private void SaveEntity <T>(T[] entitys, ExportEntityEventArgs args) where T : EntityBase, new()
{
if (entitys.Length > 0)
{
args.Succeed = MemDB.SaveEntity <T>(entitys);
if (OnSaved != null)
{
OnSaved(this, args);
}
}
}
private void SaveEntity(T[] entitys, ExportEntityEventArgs <T> args)
{
if (entitys.Length > 0)
{
args.Succeed = MemDB.SaveEntity <T>(entitys);
}
else
{
MemDB.DropEntity <T>();
args.Succeed = true;
}
if (OnSaved != null)
{
OnSaved(this, args);
}
}
