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Sqlite: Fix insertUpdateDelete

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Like you can read in https://www.sqlite.org/isolation.html after an
update they same value can be show up for an iterator advancement. This
would be lead to an delete. So the last value for update is saved and
then compared in the delete method. If they are equal the delete is
skipped.

Change-Id: Ic0aa6619f6a4a520eac77be4e5a83cbe533d102d
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
This commit is contained in:
Marco Bubke
2021-12-01 16:28:15 +01:00
parent 815383bf0a
commit c1ca2a7103
3 changed files with 74 additions and 25 deletions
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23
tests/unit/unittest/sqlitealgorithms-test.cpp
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@@ -36,16 +36,14 @@ namespace {
class KeyValueView
{
public:
KeyValueView(Utils::SmallStringView key, long long value, long long rowid)
KeyValueView(Utils::SmallStringView key, long long value)
: key{key}
, value{value}
, rowid{rowid}
{}
public:
Utils::SmallStringView key;
long long value = 0;
long long rowid = -1;
};
std::ostream &operator<<(std::ostream &out, KeyValueView keyValueView)
@@ -103,6 +101,7 @@ public:
{
Sqlite::Table table;
table.setName("data");
table.setUseWithoutRowId(true);
table.addColumn("key", Sqlite::ColumnType::None, {Sqlite::PrimaryKey{}});
table.addColumn("value");
@@ -118,22 +117,26 @@ protected:
Sqlite::Database database{":memory:", Sqlite::JournalMode::Memory};
Sqlite::ImmediateTransaction transaction{database};
Initializer initializer{database};
Sqlite::ReadStatement<3> selectViewsStatement{"SELECT key, value, rowid FROM data ORDER BY key",
Sqlite::ReadStatement<2> selectViewsStatement{"SELECT key, value FROM data ORDER BY key",
database};
Sqlite::ReadStatement<2> selectValuesStatement{"SELECT key, value FROM data ORDER BY key",
database};
Sqlite::WriteStatement insertStatement{"INSERT INTO data(key, value) VALUES (?1, ?2)", database};
Sqlite::WriteStatement updateStatement{"UPDATE data SET value = ?2 WHERE rowid = ?1", database};
Sqlite::WriteStatement deleteStatement{"DELETE FROM data WHERE rowid = ?", database};
Sqlite::WriteStatement updateStatement{"UPDATE data SET value = ?2 WHERE key=?1", database};
Sqlite::WriteStatement deleteStatement{"DELETE FROM data WHERE key=?", database};
std::function<void(const KeyValue &keyValue)> insert{
[&](const KeyValue &keyValue) { insertStatement.write(keyValue.key, keyValue.value); }};
std::function<void(KeyValueView keyValueView, const KeyValue &keyValue)> update{
std::function<Sqlite::UpdateChange(KeyValueView keyValueView, const KeyValue &keyValue)> update{
[&](KeyValueView keyValueView, const KeyValue &keyValue) {
if (!(keyValueView == keyValue))
updateStatement.write(keyValueView.rowid, keyValue.value);
if (!(keyValueView == keyValue)) {
updateStatement.write(keyValueView.key, keyValue.value);
return Sqlite::UpdateChange::Update;
}
return Sqlite::UpdateChange::No;
}};
std::function<void(KeyValueView keyValueView)> remove{
[&](KeyValueView keyValueView) { deleteStatement.write(keyValueView.rowid); }};
[&](KeyValueView keyValueView) { deleteStatement.write(keyValueView.key); }};
};
auto compareKey = [](KeyValueView keyValueView, const KeyValue &keyValue) {