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Sqlite: Use string view as result value

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String view is returning simply the string pointer and the size from the
database. In that way we remove useless copies to an intermediate data
type.

Change-Id: I3354061938c52df585e91054a97c900ae4cd39b3
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
This commit is contained in:
Marco Bubke
2017-10-18 13:37:34 +02:00
committed by Tim Jenssen
parent 507d99f03c
commit 0a3df84533
3 changed files with 25 additions and 32 deletions
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15
src/libs/sqlite/sqlitebasestatement.cpp
View File

@@ -436,10 +436,10 @@ static StringType convertToTextForColumn(sqlite3_stmt *sqlStatment, int column)
case SQLITE_FLOAT:
case SQLITE3_TEXT: return textForColumn<StringType>(sqlStatment, column);
case SQLITE_BLOB:
case SQLITE_NULL: return {};
case SQLITE_NULL: break;
}
Q_UNREACHABLE();
return StringType{"", 0};
}
int BaseStatement::fetchIntValue(int column) const
@@ -500,17 +500,12 @@ StringType BaseStatement::fetchValue(int column) const
return convertToTextForColumn<StringType>(m_compiledStatement.get(), column);
}
Utils::SmallString BaseStatement::fetchSmallStringValue(int column) const
Utils::SmallStringView BaseStatement::fetchSmallStringViewValue(int column) const
{
return fetchValue<Utils::SmallString>(column);
}
Utils::PathString BaseStatement::fetchPathStringValue(int column) const
{
return fetchValue<Utils::PathString>(column);
return fetchValue<Utils::SmallStringView>(column);
}
template SQLITE_EXPORT Utils::SmallStringView BaseStatement::fetchValue<Utils::SmallStringView>(int column) const;
template SQLITE_EXPORT Utils::SmallString BaseStatement::fetchValue<Utils::SmallString>(int column) const;
template SQLITE_EXPORT Utils::PathString BaseStatement::fetchValue<Utils::PathString>(int column) const;
} // namespace Sqlite

13
src/libs/sqlite/sqlitebasestatement.h
View File

@@ -64,8 +64,7 @@ public:
long fetchLongValue(int column) const;
long long fetchLongLongValue(int column) const;
double fetchDoubleValue(int column) const;
Utils::SmallString fetchSmallStringValue(int column) const;
Utils::PathString fetchPathStringValue(int column) const;
Utils::SmallStringView fetchSmallStringViewValue(int column) const;
template<typename Type>
Type fetchValue(int column) const;
int columnCount() const;
@@ -142,6 +141,7 @@ template <> SQLITE_EXPORT int BaseStatement::fetchValue<int>(int column) const;
template <> SQLITE_EXPORT long BaseStatement::fetchValue<long>(int column) const;
template <> SQLITE_EXPORT long long BaseStatement::fetchValue<long long>(int column) const;
template <> SQLITE_EXPORT double BaseStatement::fetchValue<double>(int column) const;
extern template SQLITE_EXPORT Utils::SmallStringView BaseStatement::fetchValue<Utils::SmallStringView>(int column) const;
extern template SQLITE_EXPORT Utils::SmallString BaseStatement::fetchValue<Utils::SmallString>(int column) const;
extern template SQLITE_EXPORT Utils::PathString BaseStatement::fetchValue<Utils::PathString>(int column) const;
@@ -323,14 +323,9 @@ private:
return statement.fetchDoubleValue(column);
}
operator Utils::SmallString()
operator Utils::SmallStringView()
{
return statement.fetchSmallStringValue(column);
}
operator Utils::PathString()
{
return statement.fetchPathStringValue(column);
return statement.fetchSmallStringViewValue(column);
}
StatementImplementation &statement;