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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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16
Userland/Libraries/LibSQL/Database.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
* Copyright (c) 2021, Mahmoud Mandour <ma.mandourr@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -47,6 +48,21 @@ ErrorOr<void> Database::open()
default_schema = SchemaDef::construct("default");
TRY(add_schema(*default_schema));
}
auto master_schema = TRY(get_schema("master"));
if (!master_schema) {
master_schema = SchemaDef::construct("master");
TRY(add_schema(*master_schema));
}
auto table_def = TRY(get_table("master", "internal_describe_table"));
if (!table_def) {
auto describe_internal_table = TableDef::construct(master_schema, "internal_describe_table");
describe_internal_table->append_column("Name", SQLType::Text);
describe_internal_table->append_column("Type", SQLType::Text);
TRY(add_table(*describe_internal_table));
}
return {};
}