public T ExecuteScalar <T> ()
{
if (_conn.Trace)
{
Debug.WriteLine("Executing Query: " + this);
}
T val = default(T);
var stmt = Prepare();
if (SQLite3.Step(stmt) == SQLite3.Result.Row)
{
var colType = SQLite3.ColumnType(stmt, 0);
val = (T)ReadCol(stmt, 0, colType, typeof(T));
}
Finalize(stmt);
return(val);
}
public IEnumerable <T> ExecuteDeferredQuery <T> (TableMapping map)
{
if (_conn.Trace)
{
Debug.WriteLine("Executing Query: " + this);
}
var stmt = Prepare();
try
{
var cols = new TableMapping.Column[SQLite3.ColumnCount(stmt)];
for (int i = 0; i < cols.Length; i++)
{
var name = SQLite3.ColumnName16(stmt, i);
cols [i] = map.FindColumn(name);
}
while (SQLite3.Step(stmt) == SQLite3.Result.Row)
{
var obj = Activator.CreateInstance(map.MappedType);
for (int i = 0; i < cols.Length; i++)
{
if (cols [i] == null)
{
continue;
}
var colType = SQLite3.ColumnType(stmt, i);
var val = ReadCol(stmt, i, colType, cols [i].ColumnType);
cols [i].SetValue(obj, val);
}
OnInstanceCreated(obj);
yield return((T)obj);
}
}
finally
{
SQLite3.Finalize(stmt);
}
}