public IEnumerator <TResult> GetEnumerator()
{
while (Reader.Read())
{
TRowType item = Activator.CreateInstance <TRowType>();
var typeData = KnownTypeData.GetTypeData(typeof(TRowType));
var currentKeys = Reader.GetCurrentKeys();
foreach (var k in currentKeys)
{
var p = typeData.PropertiesByFieldName[k];
var realPropertyName = k;
var fqlFieldName = p.FqlFieldName;
var propInfo = p.PropertyInfo;
var value = Reader[fqlFieldName, propInfo.PropertyType];
if (value != null)
{
propInfo.SetValue(item, value, null);
}
}
if (Selector != null)
{
yield return(Selector(item));
}
else
{
yield return((TResult)(object)item); //TODO:
}
}
}
private void _Build(MemberExpression exp)
{
var member = exp.Member;
var memberType = ReflectionHelper.GetMemberType(member);
if (typeof(IFqlDataQuery).IsAssignableFrom(memberType)) //Query
{
if (exp.Expression is ConstantExpression)
{
var obj = ((ConstantExpression)(exp.Expression)).Value;
var value = ReflectionHelper.GetMemberValue(member, obj);
Build(value);
}
else
{
throw new NotSupportedException();
}
}
else if (typeof(IFqlTable).IsAssignableFrom(memberType)) //Table
{
var tableRowType = ((PropertyInfo)exp.Member).PropertyType.GetGenericArguments()[0];
var td = KnownTypeData.GetTypeData(tableRowType);
var tblName = GetTableName(td);
Write(tblName);
}
else //Column
{
var memberName = exp.Member.Name;
var td = KnownTypeData.GetTypeData(exp.Member.DeclaringType);
if (exp.Member.Name == "Me")
{
Write("me()");
}
else if (td.Properties.ContainsKey(memberName))
{
var pd = td.Properties[exp.Member.Name];
Write(pd.FqlFieldName);
}
else if (exp.Expression != null &&
exp.Expression.Type == typeof(string) &&
exp.Member != null &&
exp.Member.Name == "Length"
)
{
var p = exp.Expression == null ? null : Eval(exp.Expression);
Write("strlen(" + (p as PropNameString).Name + ")");
}
else //Variable
{
var value = Eval(exp);
Build(value);
}
}
}
private T LoadObject <T>(object key) where T : class //FacebookObject
{
var td = KnownTypeData.GetTypeData(typeof(T));
var column = td.IdentityProperty;
if (column == null)
{
return(null);
}
var propsCSV = td.Properties.StringConcat(p => p.Value.FqlFieldName, "", ",", "");
var fql = String.Format("SELECT {0} from {1} where {2}={3} limit 1",
propsCSV,
td.FqlTableName,
td.IdentityProperty.FqlFieldName,
key);
return((GetType().GetMethod("PerformGenericFql").MakeGenericMethod(typeof(T)).Invoke(this, new object[] { fql }) as IEnumerable <T>).FirstOrDefault());
}
internal static string FixQuery(string fql)
{
var words = fql.Split(' ');
if (words.Length < 3)
{
return(fql);
}
if (words[0].ToLower() != "select")
{
return(fql);
}
if (words[2].ToLower() != "from")
{
return(fql);
}
var replacement = words[1];
if (replacement != "*")
{
return(fql);
}
var tableName = words[3].ToLower();
if (tableName.StartsWith("app."))
{
tableName = tableName.Substring(4);
}
var td = KnownTypeData.GetTypeDataByTableName(tableName);
if (td == null)
{
throw new Exception();
}
replacement = td.PropertiesByFieldName.Keys.StringConcat(",");
if (replacement.IsNotNullOrEmpty())
{
words[1] = replacement;
}
return(words.StringConcat(" "));
}
/// <summary>
/// Performs a generic FQL query against facebook
/// </summary>
public IEnumerable <T> PerformGenericFql <T>(string fql) where T : class
{
var items = new List <T>();
fql = FixQuery(fql);
var result = Provider.ExecuteFqlQuery(fql);
var reader = new FacebookDataReader(result);
var td = KnownTypeData.GetTypeData(typeof(T));
while (reader.Read())
{
T item = null;
var elem = Activator.CreateInstance <T>();
var fetched = false;
if (td.IdentityProperty != null)
{
var idVal = reader[td.IdentityProperty.FqlFieldName];
item = GetObject <T>(idVal, false);
fetched = item != null;
}
if (!fetched)
{
item = Activator.CreateInstance <T>();
//item.DataContext = this;
if (item != null && td.IdentityProperty != null)
{
StoreObject <T>(item, reader[td.IdentityProperty.FqlFieldName]);
}
}
foreach (var pData in td.Properties)
{
pData.Value.PropertyInfo.SetValue(item, reader[pData.Value.FqlFieldName], null);
}
items.Add(item);
}
return(items);
}
private void _Build(ConstantExpression exp)
{
var value = exp.Value;
if (value == null)
{
Write("NULL");
}
else
{
var type = value.GetType();
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(FqlTable <>))
{
var elemType = EnumerableHelper.GetEnumerableItemType(type);
var tblName = GetTableName(KnownTypeData.GetTypeData(elemType));
Write("{0}", tblName);
}
else
{
Build(exp.Value);
}
}
}
/// <summary>
/// Stores an object in the database cache.
/// </summary>
public virtual void StoreObject <T>(T o, object key) where T : class // : FacebookObject
{
StoreObject(KnownTypeData.GetTypeData(typeof(T)), o, key);
}
