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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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15
Userland/Libraries/LibSQL/AST/AST.h
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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
*/
@ -1050,4 +1051,18 @@ private:
RefPtr<LimitClause> m_limit_clause;
};
class DescribeTable : public Statement {
public:
DescribeTable(NonnullRefPtr<QualifiedTableName> qualified_table_name)
: m_qualified_table_name(move(qualified_table_name))
{
}
NonnullRefPtr<QualifiedTableName> qualified_table_name() const { return m_qualified_table_name; }
RefPtr<SQLResult> execute(ExecutionContext&) const override;
private:
NonnullRefPtr<QualifiedTableName> m_qualified_table_name;
};
}