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Core/Database: Optimize named query result field access

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This commit is contained in:
Shauren
2025-01-23 12:45:56 +01:00
parent 6de1e51a2f
commit f5d71b2b92
2 changed files with 31 additions and 8 deletions
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31
src/server/database/Database/QueryResult.h
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@@ -20,9 +20,32 @@
#include "Define.h"
#include "DatabaseEnvFwd.h"
#include "Hash.h"
#include <unordered_map>
#include <vector>
namespace Trinity::DB
{
struct FieldLookupByAliasKey
{
std::size_t HashValue; ///< Cached hash value (first field to make opeartor== return early, minimizing number of string comparisons)
std::string_view Alias;
// implicit constructor from string literal for users of the query result
consteval FieldLookupByAliasKey(char const* alias) : HashValue(HashFnv1a(alias)), Alias(alias) { }
// runtime only constructor used internally to fill alias to index mapping
struct RuntimeInitTag { } static inline constexpr RuntimeInit = { };
FieldLookupByAliasKey(RuntimeInitTag, std::string_view alias) : HashValue(HashFnv1a(alias)), Alias(std::move(alias)) { }
friend bool operator==(FieldLookupByAliasKey const& left, FieldLookupByAliasKey const& right) = default;
struct Hash { constexpr std::size_t operator()(FieldLookupByAliasKey const& k) const { return k.HashValue; } };
};
using FieldAliasToIndexMap = std::unordered_map<FieldLookupByAliasKey, std::size_t, FieldLookupByAliasKey::Hash>;
}
class TC_DATABASE_API ResultSet
{
public:
@@ -35,13 +58,13 @@ class TC_DATABASE_API ResultSet
Field* Fetch() const { return _currentRow; }
Field const& operator[](std::size_t index) const;
Field const& operator[](std::string_view const& alias) const;
Field const& operator[](Trinity::DB::FieldLookupByAliasKey const& alias) const;
QueryResultFieldMetadata const& GetFieldMetadata(std::size_t index) const;
protected:
std::vector<QueryResultFieldMetadata> _fieldMetadata;
std::unordered_map<std::string_view, std::size_t> _fieldIndexByAlias;
Trinity::DB::FieldAliasToIndexMap _fieldIndexByAlias;
uint64 _rowCount;
Field* _currentRow;
uint32 _fieldCount;
@@ -67,13 +90,13 @@ class TC_DATABASE_API PreparedResultSet
Field* Fetch() const;
Field const& operator[](std::size_t index) const;
Field const& operator[](std::string_view const& alias) const;
Field const& operator[](Trinity::DB::FieldLookupByAliasKey const& alias) const;
QueryResultFieldMetadata const& GetFieldMetadata(std::size_t index) const;
protected:
std::vector<QueryResultFieldMetadata> m_fieldMetadata;
std::unordered_map<std::string_view, std::size_t> m_fieldIndexByAlias;
Trinity::DB::FieldAliasToIndexMap m_fieldIndexByAlias;
std::vector<Field> m_rows;
uint64 m_rowCount;
uint64 m_rowPosition;