public CurrentInformation(bool interactive)
{
information["interactive"] = new Precomputation(interactive);
information["login"] = new Precomputation(new SimpleStringish(Environment.UserName));
information["directory"] = new Precomputation(new SimpleStringish(Environment.CurrentDirectory));
information["version"] = new Precomputation(Configuration.Version);
information["vm/name"] = new Precomputation(new SimpleStringish("CLR"));
information["vm/vendor"] = new Precomputation(new SimpleStringish(Type.GetType("Mono.Runtime") != null ? "Mono" : "Microsoft"));
information["vm/version"] = new Precomputation(new SimpleStringish(Environment.Version.ToString()));
}
protected override bool Run()
{
if (connection == null)
{
new Lookup(task_master, source_ref, new [] { "connection" },
context).Notify(return_value => {
if (return_value is ReflectedFrame)
{
Object backing = ((ReflectedFrame)return_value).Backing;
if (backing is DbConnection)
{
connection = (DbConnection)backing;
if (Interlocked.Decrement(ref interlock) == 0)
{
task_master.Slot(this);
}
return;
}
}
task_master
.ReportOtherError(source_ref,
"Expected “connection” to come from “sql:” import.");
});
new Lookup(task_master, source_ref, new [] { "sql_query" },
context).Notify(return_value => {
if (return_value is Stringish)
{
query = return_value.ToString();
if (Interlocked.Decrement(ref interlock) == 0)
{
task_master.Slot(this);
}
return;
}
task_master.ReportOtherError(source_ref, string.Format(
"Expected type Str for “sql_query”, but got {0}.",
Stringish.NameForType(return_value.GetType())));
});
new Lookup(task_master, source_ref, new [] { "sql_row_tmpl" },
context).Notify(return_value => {
if (return_value is Template)
{
row_tmpl = (Template)return_value;
if (Interlocked.Decrement(ref interlock) == 0)
{
task_master.Slot(this);
}
return;
}
task_master.ReportOtherError(source_ref, string.Format(
"Expected type Template for “sql_row_tmpl”, but got {0}.",
Stringish.NameForType(return_value.GetType())));
});
if (Interlocked.Decrement(ref interlock) > 0)
{
return(false);
}
}
try {
var command = connection.CreateCommand();
command.CommandType = System.Data.CommandType.Text;
command.CommandText = query;
var reader = command.ExecuteReader();
if (debug)
{
Console.WriteLine("SQL Query to {0}: {1}", connection, query);
}
NameChooser name_chooser = (rs, it) => TaskMaster.OrdinalNameStr(it);
var retrievers = new List <Retriever>();
for (int col = 0; col < reader.FieldCount; col++)
{
var column = col;
if (reader.GetName(col) == "ATTRNAME")
{
name_chooser = (rs, it) => rs.GetString(column);
continue;
}
if (reader.GetName(col).StartsWith("$"))
{
var attr_name = reader.GetName(col).Substring(1);
if (!task_master.VerifySymbol(source_ref, attr_name))
{
return(false);
}
retrievers.Add((rs, frame, _task_master) => frame.Set(attr_name, rs.IsDBNull(column) ? Precomputation.Capture(Unit.NULL) : Lookup.Do(rs.GetString(column).Split('.'))));
continue;
}
Unpacker unpacker;
if (!unpackers.TryGetValue(reader.GetFieldType(col), out unpacker))
{
task_master
.ReportOtherError(
source_ref,
string.Format(
"Cannot convert SQL type “{0}” for column “{1}” into Flabbergast type.",
reader.GetFieldType(col),
reader.GetName(col)));
}
if (!task_master.VerifySymbol(source_ref,
reader.GetName(col)))
{
return(false);
}
retrievers.Add(Bind(reader.GetName(col), col, unpacker));
}
var list = new MutableFrame(task_master, source_ref, context, self);
for (int it = 1; reader.Read(); it++)
{
var frame = new MutableFrame(task_master, new JunctionReference(string.Format("SQL template instantiation row {0}", it), "<sql>", 0, 0, 0, 0, source_ref, row_tmpl.SourceReference), Context.Append(list.Context, row_tmpl.Context), list);
foreach (var r in retrievers)
{
r(reader, frame, task_master);
}
foreach (var name in row_tmpl.GetAttributeNames())
{
if (!frame.Has(name))
{
frame.Set(name, row_tmpl[name]);
}
}
list.Set(name_chooser(reader, it), frame);
}
list.Slot();
result = list;
return(true);
} catch (DataException e) {
task_master.ReportOtherError(source_ref, e.Message);
return(false);
}
}