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9022cf99ff
There was a lot of `VERIFY_NOT_REACHED` error handling going on. Fixed most of those. A bit of a caveat is that after every `evaluate` call for expressions that are part of a statement the error status of the `SQLResult` return value must be called.
61 lines
2.2 KiB
C++
61 lines
2.2 KiB
C++
/*
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* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibSQL/AST/AST.h>
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#include <LibSQL/Database.h>
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#include <LibSQL/Meta.h>
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#include <LibSQL/Row.h>
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namespace SQL::AST {
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RefPtr<SQLResult> Select::execute(ExecutionContext& context) const
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{
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if (table_or_subquery_list().size() == 1 && table_or_subquery_list()[0].is_table()) {
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auto table = context.database->get_table(table_or_subquery_list()[0].schema_name(), table_or_subquery_list()[0].table_name());
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if (!table) {
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return SQLResult::construct(SQL::SQLCommand::Select, SQL::SQLErrorCode::TableDoesNotExist, table_or_subquery_list()[0].table_name());
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}
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NonnullRefPtrVector<ResultColumn> columns;
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if (result_column_list().size() == 1 && result_column_list()[0].type() == ResultType::All) {
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for (auto& col : table->columns()) {
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columns.append(
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create_ast_node<ResultColumn>(
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create_ast_node<ColumnNameExpression>(table->parent()->name(), table->name(), col.name()),
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""));
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}
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} else {
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for (auto& col : result_column_list()) {
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columns.append(col);
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}
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}
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context.result = SQLResult::construct();
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AK::NonnullRefPtr<TupleDescriptor> descriptor = AK::adopt_ref(*new TupleDescriptor);
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Tuple tuple(descriptor);
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for (auto& row : context.database->select_all(*table)) {
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context.current_row = &row;
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if (where_clause()) {
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auto where_result = where_clause()->evaluate(context);
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if (context.result->has_error())
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return context.result;
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if (!where_result)
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continue;
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}
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tuple.clear();
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for (auto& col : columns) {
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auto value = col.expression()->evaluate(context);
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if (context.result->has_error())
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return context.result;
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tuple.append(value);
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}
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context.result->append(tuple);
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}
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return context.result;
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}
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return SQLResult::construct();
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}
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}
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