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/*
* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibSQL/AST/AST.h>
#include <LibSQL/Database.h>
#include <LibSQL/Meta.h>
#include <LibSQL/Row.h>
namespace SQL::AST {
RefPtr<SQLResult> Select::execute(ExecutionContext& context) const
{
if (table_or_subquery_list().size() == 1 && table_or_subquery_list()[0].is_table()) {
auto table = context.database->get_table(table_or_subquery_list()[0].schema_name(), table_or_subquery_list()[0].table_name());
if (!table) {
return SQLResult::construct(SQL::SQLCommand::Select, SQL::SQLErrorCode::TableDoesNotExist, table_or_subquery_list()[0].table_name());
}
NonnullRefPtrVector<ResultColumn> columns;
if (result_column_list().size() == 1 && result_column_list()[0].type() == ResultType::All) {
for (auto& col : table->columns()) {
columns.append(
create_ast_node<ResultColumn>(
create_ast_node<ColumnNameExpression>(table->parent()->name(), table->name(), col.name()),
""));
}
} else {
for (auto& col : result_column_list()) {
columns.append(col);
}
}
context.result = SQLResult::construct();
AK::NonnullRefPtr<TupleDescriptor> descriptor = AK::adopt_ref(*new TupleDescriptor);
Tuple tuple(descriptor);
for (auto& row : context.database->select_all(*table)) {
context.current_row = &row;
if (where_clause()) {
auto where_result = where_clause()->evaluate(context);
if (context.result->has_error())
return context.result;
if (!where_result)
continue;
}
tuple.clear();
for (auto& col : columns) {
auto value = col.expression()->evaluate(context);
if (context.result->has_error())
return context.result;
tuple.append(value);
}
context.result->append(tuple);
}
return context.result;
}
return SQLResult::construct();
}
}
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