public int SaveChanges()
{
bool result = false;
object[] params1 = { "AddDirectly".ToCharArray() }; //en başta çünkü child'lara bunun id'si yerleştirilecek
object[] params2 = { "AddChilds".ToCharArray() }; //childlar eklendikten sonra parentlar güncellenecek
object[] params3 = { "Update".ToCharArray() }; //güncelleme
object[] params4 = { "Remove".ToCharArray() };
object[] params5 = { "AddOTM".ToCharArray() }; //en sonda çünkü önce parent eklenmeli, id'ye sahip olmalı.
object[] params6 = { "UpdateAfterRemoval".ToCharArray() };
object[][] parameters = { params1, params2, params3, params4, params5, params6 };
foreach (object[] parameter in parameters)
{
foreach (object o in dbsets)
{
MethodInfo method = o.GetType().GetMethod("SaveChanges");
result |= (bool)method.Invoke(o, parameter);
}
}
this.removed = new Dictionary <Type, List <int> >();
if (result) //if any changes happened, they may have triggered new changes.
{
SaveChanges();
}
//Mtm kayıtlarını hallet.
String s;
var kpList = MTMToWrite.ToList();
while (kpList.Count() > 0)
{
s = kpList[0].Key;
String filepath = Path.Combine(this.DatabaseFolder, kpList[0].Key);
Stream mtmStream;
mtmStream = File.OpenWrite(filepath + ".dat"); //Streami ata, aç
foreach (Tuple <BaseClass, BaseClass> mtmRecBase in kpList[0].Value)
{
MTMRec mtmRec = new MTMRec(mtmRecBase.Item1.id, mtmRecBase.Item2.id);
int fk = FileOps.Add(mtmStream, new List <int>(), mtmRec);
mtmRec.id = fk;
//Streami kapa, sil listeden.
}
mtmStream.Close();
kpList.RemoveAt(0);
MTMToWrite.Remove(s);
}
return(0);
}
/// <summary>
/// Completes changes in the dbset chosen by the command.
/// </summary>
/// <param name="command">AddDirectly, AddChilds, Update, Remove</param>
public bool SaveChanges(char[] com)
{
String command = new string(com);
bool result = false;
if (command == "AddOTM")
{
while (recordsToAddAsOTM.Count() != 0)
{
Tuple <object, object, PropertyInfo> rec = recordsToAddAsOTM[0];
OpenMainWrite();
rec.Item3.SetValue(rec.Item2, rec.Item1);
int fk = FileOps.Add(mainFile, removedIndexes, (BaseClass)rec.Item2);
rec.Item2.GetType().GetProperty(rec.Item3.Name).SetValue(rec.Item2, fk);
result = true;
}
}
else if (command == "AddDirectly")
{
//0. elemanlar ile işlem yapma nedeni:
//Bir ekleme işlemi yapılırken, içinde çocuk nesne var ise, bir şekilde üzerinde çalışılan
//listenin sonuna yeni kayıt eklenmesine neden olabilir.
OpenMainWrite();
while (recordsToAddDirectly.Count() != 0)
{
result = true;
int id = FileOps.Add(mainFile, removedIndexes, recordsToAddDirectly[0]);
recordsToAddDirectly[0].id = id;
allRecords.Add(recordsToAddDirectly[0]);
recordsToAddDirectly.RemoveAt(0);
}
mainFile.Close();
}
else if (command == "AddChilds")
{
OpenMainWrite();
while (recordsToAddAsOTO.Count() != 0)
{
result = true;
//item1=parent, item2=child
T record = (T)recordsToAddAsOTO[0].Item2;
int fk = FileOps.Add(mainFile, removedIndexes, record);
record.id = fk;
Type ownerType = recordsToAddAsOTO[0].Item1.GetType();
Type ownerDbSetType = ctx.dbsetTypes.Where(a => a.ToString().Equals(ownerType.ToString())).ElementAt(0);
object ownerDbSet = ctx.GetDBSetByType(ownerDbSetType);
object[] parameters = new object[1];
parameters[0] = (BaseClass)recordsToAddAsOTO[0].Item1;
//Explained under recordsToAddAsOTO declaration.
ownerDbSet.GetType().GetMethod("Update").Invoke(ownerDbSet, parameters);
allRecords.Add(record);
recordsToAddAsOTO.RemoveAt(0);
}
mainFile.Close();
}
else if (command == "Update")
{
OpenMainWrite();
while (Updates.Count() != 0)
{
result = true;
T record = Updates[0];
FileOps.Overwrite(mainFile, record);
Updates.RemoveAt(0);
}
mainFile.Close();
}
else if (command == "Remove")
{
OpenMainWrite();
while (recordsToRemove.Count() != 0)
{
result = true;
recordsToRemove[0].GetType().GetProperty("removed").SetValue(recordsToRemove[0], true);
FileOps.Remove(mainFile, metaFile, recordsToRemove[0]);
if (!ctx.removed.Any(kp => kp.Key == typeof(T)))
{
ctx.removed.Add(typeof(T), new List <int>());
}
ctx.removed.FirstOrDefault(kp => kp.Key == typeof(T)).Value
.Add((int)recordsToRemove[0].id);
recordsToRemove.RemoveAt(0);
}
mainFile.Close();
}
else if (command == "UpdateAfterRemoval") //silinmiş bir kayda referans olanların foreign keylerini -1 yapacak
{
List <PropertyInfo> toChangeColumns = new List <PropertyInfo>();
Dictionary <int, List <int> > toChange = new Dictionary <int, List <int> >();
foreach (KeyValuePair <Type, List <int> > kp in ctx.removed)
{
List <PropertyInfo> props = this.GetType().GetGenericArguments()[0].GetProperties().ToList();
foreach (PropertyInfo info in props)
{
if (!info.PropertyType.IsGenericType && info.PropertyType.Name.Equals(kp.Key.Name))
{
toChangeColumns.Add(info);
foreach (int id in kp.Value) //null yapılacak id
{
toChange.Add(id, new List <int>());
}
}
else if (info.PropertyType.IsGenericType && info.PropertyType.GetGenericArguments()[0].Name == kp.Key.Name)
{
//remove from mtm
}
}
}
foreach (T rec in allRecords)
{
foreach (PropertyInfo column in toChangeColumns)
{
foreach (KeyValuePair <int, List <int> > kp in toChange)
{
BaseClass child_rec = (BaseClass)rec.GetType().GetProperty(column.Name).GetValue(rec);
if (child_rec.id == kp.Key)
{
rec.GetType().GetProperty(column.Name).SetValue(rec, null);
kp.Value.Add(rec.id);
}
}
}
}
foreach (PropertyInfo column in toChangeColumns)
{
OpenMainWrite();
FileOps.MakeReferenceNull(mainFile, column, typeof(T), toChange);
mainFile.Close();
}
}
return(result);
}