private void LoadFromDatabase()
{
if (this.buffer == null)
{
//go to the database and get the buffer;
this.buffer = entity.GetPropertyValue(propName, true) as byte[];
}
}
/// <summary>
/// Converts a datatable into a set of instances of baseClass.
/// </summary>
/// <param name="table">A System.Data.DataTable with raw database data.</param>
/// <param name="lazyLoading">Indicates whether to enable the lazyLoading on created instances.</param>
/// <param name="baseClass">Defines which type to load.</param>
/// <exception cref="System.ArgumentNullException">Occurs when table or baseClass parameters are null.</exception>
/// <returns>An array of entities.</returns>
internal static EntityBase[] BindRows(DataTable table, SearchOptions searchOptions, string baseAlias)
{
if (table == null)
{
throw new ArgumentNullException("table");
}
if (searchOptions == null)
{
throw new ArgumentNullException("searchOptions");
}
if (searchOptions.eagerLoading.Count == 0)
{
//TODO: Check if this is necessary by performance needs.
EntityBase[] instances = (EntityBase[])(Array.CreateInstance(searchOptions.baseType, table.Rows.Count));
for (int i = 0; i <= instances.Length - 1; i++)
{
instances[i] = (EntityBase)(Activator.CreateInstance(searchOptions.baseType));
instances[i].Bind(searchOptions.LazyLoading, baseAlias, null, table.Rows[i]);
}
return(instances);
}
else
{
Type listof = typeof(List <>).MakeGenericType(searchOptions.baseType);
IList instances = (IList)Activator.CreateInstance(listof);
//lets get metadata for baseClass and other things requested by the user.
List <FieldInfo[]> meta = new List <FieldInfo[]>();
meta.Add(EntityBase.GetPrimaryKeys(searchOptions.baseType));
List <ForeignKeyInfo> keys = new List <ForeignKeyInfo>(); //i need this to get fks by index
foreach (ForeignKeyInfo fkInfo in searchOptions.eagerLoading.Keys)
{
keys.Add(fkInfo);
meta.Add(EntityBase.GetPrimaryKeys(fkInfo.ElementType)); //pks of each eagerloading
}
List <string>[] lastPk = new List <string> [meta.Count];
for (int i = 0; i < meta.Count; i++)
{
lastPk[i] = new List <string>();
}
foreach (DataRow dr in table.Rows)
{
string basePk = string.Empty;
foreach (FieldInfo fi in meta[0])
{
string alias = fi.DataFieldName;
basePk += "||" + dr[alias].ToString();
}
for (int i = 0; i < meta.Count; i++)
{
ForeignKeyInfo key = (i == 0 ? null : keys[i - 1]);
string currentPKs = basePk;
if (i > 0)
{
foreach (FieldInfo fi in meta[i])
{
string alias = (i == 0 ? fi.DataFieldName : searchOptions.eagerLoading[key] + fi.DataFieldName);
currentPKs += "||" + dr[alias].ToString();
}
}
if (!string.IsNullOrEmpty(currentPKs) && !lastPk[i].Contains(currentPKs))
{
lastPk[i].Add(currentPKs);
EntityBase instance = (EntityBase)Activator.CreateInstance((i == 0 ? searchOptions.baseType : key.ElementType));
instance.Bind(searchOptions.LazyLoading, (i == 0 ? null : searchOptions.eagerLoading[key]), null, dr);
if (key == null)
{
instances.Add(instance);
}
else
{
int index = lastPk[0].IndexOf(basePk);
EntityBase baseInstance = (EntityBase)instances[index];
if (key.IsArray)
{
baseInstance.lazyEnabled = false;
IList value = (IList)baseInstance.GetPropertyValue(key.RelatedProperty.Name, false);
baseInstance.lazyEnabled = true;
value.Add(instance);
}
else
{
baseInstance.SetPropertyValue(key.RelatedProperty.Name, instance);
}
}
}
}
}
return((EntityBase[])instances.GetType().GetMethod("ToArray").Invoke(instances, null));
}
}
