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LibSQL: Implement a DESCRIBE TABLE statement

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This statement (for now) outputs the name and types of the different
attributes in a table. It's not standard SQL but all DBMSs that I know
of implement a sort of statement for such functionality.

Since the output of DESCRIBE TABLE is just a relation, an internal
schema, `master` was created and a table definition for DESCRIBE into
it. The table definition and the master schema are not accessible by the
user.
This commit is contained in:
Mahmoud Mandour 2021-12-06 15:30:38 +02:00 • committed by Andreas Kling
parent cd4dba87fa
commit f6233913ad
9 changed files with 93 additions and 0 deletions
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13
Userland/Libraries/LibSQL/AST/Parser.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2021, Tim Flynn <trflynn89@serenityos.org>
* Copyright (c) 2021, Mahmoud Mandour <ma.mandourr@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -46,6 +47,8 @@ NonnullRefPtr<Statement> Parser::parse_statement()
return parse_alter_table_statement();
case TokenType::Drop:
return parse_drop_table_statement();
case TokenType::Describe:
return parse_describe_table_statement();
case TokenType::Insert:
return parse_insert_statement({});
case TokenType::Update:
@ -181,6 +184,16 @@ NonnullRefPtr<DropTable> Parser::parse_drop_table_statement()
return create_ast_node<DropTable>(move(schema_name), move(table_name), is_error_if_table_does_not_exist);
}
NonnullRefPtr<DescribeTable> Parser::parse_describe_table_statement()
{
consume(TokenType::Describe);
consume(TokenType::Table);
auto table_name = parse_qualified_table_name();
return create_ast_node<DescribeTable>(move(table_name));
}
NonnullRefPtr<Insert> Parser::parse_insert_statement(RefPtr<CommonTableExpressionList> common_table_expression_list)
{
// https://sqlite.org/lang_insert.html