/// <summary>
/// Saves an Object into the database. Returns true if the Object was successfully saved, false otherwise. The objects status is captured immediately, but the queries are run asynchronously.
/// </summary>
/// <param name="p_obj">The Object to save.</param>
/// <returns>A status object indicating the success/failure of the operation.</returns>
public async Task <CDBWizardStatus> SaveAsync <T>(T p_obj)
{
CObjectMap p_object_map = CObjectMap.Get(p_obj.GetType());
if (p_object_map.m_p_begin_delete_call_back != null)
{
p_object_map.m_p_begin_delete_call_back(p_obj);
}
if (p_object_map.m_p_unique_keys.Count == 0)
{
throw new Exception("Cannot save Object without any identifying primary keys defined");
}
CDBWizardStatus p_status = await p_object_map.SaveObjectAsync(this, p_obj);
if (!p_status.IsError)
{
if (p_object_map.m_p_end_save_call_back != null)
{
p_object_map.m_p_end_save_call_back(p_obj);
}
return(p_status);
}
return(p_status);
}
internal void SetObject(Object p_obj, String p_value_name, Dictionary <Object, CDataBaseObject> p_mapped_objects)
{
CDataBaseObject p_db_obj = null;
if (p_obj != null)
{
if (!p_mapped_objects.TryGetValue(p_obj, out p_db_obj))
{
p_db_obj = new CDataBaseObject(CObjectMap.Get(p_obj.GetType()));
p_db_obj.MapFrom(p_obj, p_mapped_objects);
if (p_db_obj.IsEmpty)
{
p_db_obj = null;
}
}
}
ESetObjectStatus status = SetDBObject(p_db_obj, p_value_name);
switch (status)
{
case ESetObjectStatus.err_table_link_ambiguous:
case ESetObjectStatus.err_table_not_linked:
throw new Exception("Error while trying to set database Object from given value: " + status.ToString());
case ESetObjectStatus.success:
break;
}
}
/// <summary>
/// Constructs a new database object and sets its internal values according to the given object.
/// </summary>
/// <param name="p_obj">The object that is used as base for this database object.</param>
public CDataBaseObject(Object p_obj)
{
if (p_obj == null)
{
throw new ArgumentNullException("The object you provide must not be null.");
}
m_p_map = CObjectMap.Get(p_obj.GetType());
_m_p_values = new Dictionary <String, Object>();
MapFrom(p_obj, new Dictionary <Object, CDataBaseObject>());
}
public void MapToClass <T>(T p_obj) where T : class
{
if (p_obj == null)
{
throw new ArgumentNullException("You must provide an Object.");
}
Action <CDataBaseObject> p_delegate = (Action <CDataBaseObject>)CObjectMap.Get(p_obj.GetType()).m_p_map_to_method.CreateDelegate(typeof(Action <CDataBaseObject>), p_obj);
p_delegate(this);
}
private static void ProcessStoreAttributes(Type p_type)
{
// TODO: Think about inheritance more thoroughly...
// Also GetCustomAttribute<T> may throw an ambiguity exception (nice library design, microsoft, vexing exceptions \o/)
StoreAttributes.CTableAttribute p_store_table_attribute = p_type.GetCustomAttribute <StoreAttributes.CTableAttribute>();
if (p_store_table_attribute == null)
{
return; // table store attribute is the only attribute that matters when applied directly to a type.
}
CObjectMap p_object_map = CObjectMap.Get(p_type); // <- magic is in the ctor
}
/// <summary>
/// Deletes an object from the database.
/// </summary>
/// <param name="obj">The object that should be deleted from the database.</param>
/// <returns>A status object indicating the success/failure of the operation</returns>
public CDBWizardStatus Delete <T>(T obj)
{
CObjectMap p_object_map = CObjectMap.Get(obj.GetType());
if (p_object_map.m_p_begin_delete_call_back != null)
{
p_object_map.m_p_begin_delete_call_back(obj);
}
if (p_object_map.m_p_unique_keys.Count == 0)
{
throw new Exception("Cannot delete Object without any identifying primary keys defined");
}
CDBWizardStatus p_status = p_object_map.DeleteObject(this, obj);
return(p_status);
}
public async Task <Tuple <CDBWizardStatus, CDataBaseObject> > LoadObjectAsync(Type p_object_type, Object p_primary_key_value)
{
CObjectMap p_object_map = CObjectMap.Get(p_object_type);
CDataBaseObject p_result = new CDataBaseObject(p_object_map);
CDBWizardStatus p_status = await p_object_map.LoadObjectAsync(
this,
new SQL.CWhereCondition(p_object_map.m_p_unique_keys[0].m_p_column_name, "=", p_primary_key_value.ToString()),
p_result
);
if (p_status.IsError)
{
p_result = null;
}
return(new Tuple <CDBWizardStatus, CDataBaseObject>(p_status, p_result));
}
/// <summary>
/// Loads an Object of the given type with the given criteria. The criteria must uniquely identify an Object, otherwise an exception is thrown.
/// </summary>
/// <typeparam name="T">The type of the Object to load.</typeparam>
/// <param name="p_object_conditions">The criteria the loaded Object must match.</param>
/// <returns>The loaded Object that matched the criteria. If no Object matches the criteria, default(T) is returned, if multiple objects matched, an error is thrown.</returns>
public async Task <CDBWizardStatus> LoadClassAsync <T>(T p_obj, params KeyValuePair <String, Object>[] p_object_conditions) where T : class
{
CObjectMap p_object_map = CObjectMap.Get(p_obj.GetType());
if (p_object_map.m_p_begin_load_call_back != null)
{
p_object_map.m_p_begin_load_call_back(p_obj);
}
SQL.CWhereCondition[] p_conditions = new SQL.CWhereCondition[p_object_conditions.Length];
for (Int32 i = 0; i < p_object_conditions.Length; ++i)
{
p_conditions[i] = new SQL.CWhereCondition(p_object_conditions[i].Key, "=", p_object_conditions[i].Value);
}
CDataBaseObject p_db_obj = new CDataBaseObject(p_object_map);
CDBWizardStatus p_status = await p_object_map.LoadObjectAsync(
this,
new SQL.CWhereCondition(p_conditions),
p_db_obj
);
if (!p_status.IsError)
{
try
{
p_db_obj.MapToClass(p_obj);
if (p_object_map.m_p_end_load_call_back != null)
{
p_object_map.m_p_end_load_call_back(p_obj);
}
}
catch (Exception p_except)
{
return(new CDBWizardStatus(EDBWizardStatusCode.err_exception_thrown, p_except));
}
}
return(p_status);
}
/// <summary>
/// Loads an Object of the given type with the given primary key. The criteria must uniquely identify an Object, otherwise an exception is thrown.
/// </summary>
/// <typeparam name="T">The type of the Object to load.</typeparam>
/// <param name="p_primary_key_value">The criteria the loaded Object must match.</param>
/// <returns>A status Object containing information about the success/failure of the operation.</returns>
public async Task <CDBWizardStatus> LoadClassAsync <T>(T p_obj, Object p_primary_key_value) where T : class
{
CObjectMap p_object_map = CObjectMap.Get(p_obj.GetType());
if (p_object_map.m_p_begin_load_call_back != null)
{
p_object_map.m_p_begin_load_call_back(p_obj);
}
CDataBaseObject p_db_obj = new CDataBaseObject(p_object_map);
if (p_object_map.m_p_unique_keys.Count == 0)
{
throw new Exception("The class \"" + typeof(T).FullName + "\" does not define a primary key.");
}
CDBWizardStatus p_status = await p_object_map.LoadObjectAsync(
this,
new SQL.CWhereCondition(p_object_map.m_p_unique_keys[0].m_p_column_name, "=", p_primary_key_value.ToString()),
p_db_obj
);
if (!p_status.IsError)
{
try
{
p_db_obj.MapToClass(p_obj);
if (p_object_map.m_p_end_load_call_back != null)
{
p_object_map.m_p_end_load_call_back(p_obj);
}
}
catch (Exception p_except)
{
return(new CDBWizardStatus(EDBWizardStatusCode.err_exception_thrown, p_except));
}
}
return(p_status);
}
public Tuple <CDBWizardStatus, CDataBaseObject> LoadObject(Type p_object_type, Object p_primary_key_value)
{
CObjectMap p_object_map = CObjectMap.Get(p_object_type);
CDataBaseObject p_result = new CDataBaseObject(p_object_map);
if (p_object_map.m_p_unique_keys.Count == 0)
{
throw new Exception("The class \"" + p_object_type.FullName + "\" does not define a primary key.");
}
CDBWizardStatus p_status = p_object_map.LoadObject(
this,
new SQL.CWhereCondition(p_object_map.m_p_unique_keys[0].m_p_column_name, "=", p_primary_key_value.ToString()),
p_result
);
if (p_status.IsError)
{
p_result = null;
}
return(new Tuple <CDBWizardStatus, CDataBaseObject>(p_status, p_result));
}
public void MapToStruct <T>(ref T p_obj) where T : struct
{
MapToStructDelegate <T> p_delegate = (MapToStructDelegate <T>)CObjectMap.Get(p_obj.GetType()).m_p_map_to_method.CreateDelegate(typeof(MapToStructDelegate <T>));
p_delegate(ref p_obj, this);
}
