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LibSQL+SQLServer: Introduce and use ResultOr<ValueType>

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The result of a SQL statement execution is either:
    1. An error.
    2. The list of rows inserted, deleted, selected, etc.

(2) is currently represented by a combination of the Result class and
the ResultSet list it holds. This worked okay, but issues start to
arise when trying to use Result in non-statement contexts (for example,
when introducing Result to SQL expression execution).

What we really need is for Result to be a thin wrapper that represents
both (1) and (2), and to not have any explicit members like a ResultSet.
So this commit removes ResultSet from Result, and introduces ResultOr,
which is just an alias for AK::ErrorOrr. Statement execution now returns
ResultOr<ResultSet> instead of Result. This further opens the door for
expression execution to return ResultOr<Value> in the future.

Lastly, this moves some other context held by Result over to ResultSet.
This includes the row count (which is really just the size of ResultSet)
and the command for which the result is for.
This commit is contained in:
Timothy Flynn 2022-02-10 14:43:00 -05:00 • committed by Andreas Kling
parent 6409618413
commit 2397836f8e
15 changed files with 259 additions and 330 deletions
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17
Userland/Libraries/LibSQL/AST/AST.h
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@ -15,6 +15,7 @@
#include <LibSQL/AST/Token.h>
#include <LibSQL/Forward.h>
#include <LibSQL/Result.h>
#include <LibSQL/ResultSet.h>
#include <LibSQL/Type.h>
namespace SQL::AST {
@ -725,11 +726,11 @@ private:
class Statement : public ASTNode {
public:
Result execute(AK::NonnullRefPtr<Database> database) const;
ResultOr<ResultSet> execute(AK::NonnullRefPtr<Database> database) const;
virtual Result execute(ExecutionContext&) const
virtual ResultOr<ResultSet> execute(ExecutionContext&) const
{
return { SQLCommand::Unknown, SQLErrorCode::NotYetImplemented };
return Result { SQLCommand::Unknown, SQLErrorCode::NotYetImplemented };
}
};
@ -747,7 +748,7 @@ public:
const String& schema_name() const { return m_schema_name; }
bool is_error_if_schema_exists() const { return m_is_error_if_schema_exists; }
Result execute(ExecutionContext&) const override;
ResultOr<ResultSet> execute(ExecutionContext&) const override;
private:
String m_schema_name;
@ -786,7 +787,7 @@ public:
bool is_temporary() const { return m_is_temporary; }
bool is_error_if_table_exists() const { return m_is_error_if_table_exists; }
Result execute(ExecutionContext&) const override;
ResultOr<ResultSet> execute(ExecutionContext&) const override;
private:
String m_schema_name;
@ -949,7 +950,7 @@ public:
bool has_selection() const { return !m_select_statement.is_null(); }
const RefPtr<Select>& select_statement() const { return m_select_statement; }
virtual Result execute(ExecutionContext&) const override;
virtual ResultOr<ResultSet> execute(ExecutionContext&) const override;
private:
RefPtr<CommonTableExpressionList> m_common_table_expression_list;
@ -1042,7 +1043,7 @@ public:
const RefPtr<GroupByClause>& group_by_clause() const { return m_group_by_clause; }
const NonnullRefPtrVector<OrderingTerm>& ordering_term_list() const { return m_ordering_term_list; }
const RefPtr<LimitClause>& limit_clause() const { return m_limit_clause; }
Result execute(ExecutionContext&) const override;
ResultOr<ResultSet> execute(ExecutionContext&) const override;
private:
RefPtr<CommonTableExpressionList> m_common_table_expression_list;
@ -1063,7 +1064,7 @@ public:
}
NonnullRefPtr<QualifiedTableName> qualified_table_name() const { return m_qualified_table_name; }
Result execute(ExecutionContext&) const override;
ResultOr<ResultSet> execute(ExecutionContext&) const override;
private:
NonnullRefPtr<QualifiedTableName> m_qualified_table_name;