Sqlite: Add session support

Session are captured by hooking in the sqlite changes. They are saved in
blobs and containing inserts, update and deletes. Because the are
semantically coupled to translactions we add a

Change-Id: Ie095558ebc50601fcaae32958ebeeb98b72d73b9
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

tests/unit/unittest/sqlitedatabase-test.cpp

@@ -28,6 +28,7 @@
 #include "spydummy.h"
 
 #include <sqlitedatabase.h>
+#include <sqlitereadstatement.h>
 #include <sqlitetable.h>
 #include <sqlitewritestatement.h>
 #include <utf8string.h>
@@ -50,26 +51,33 @@ using Sqlite::Table;
 class SqliteDatabase : public ::testing::Test
 {
 protected:
-    void SetUp() override
+    SqliteDatabase()
     {
         database.setJournalMode(JournalMode::Memory);
         database.setDatabaseFilePath(databaseFilePath);
         auto &table = database.addTable();
         table.setName("test");
+        table.addColumn("id", Sqlite::ColumnType::Integer, {Sqlite::PrimaryKey{}});
         table.addColumn("name");
 
         database.open();
     }
 
-    void TearDown() override
+    ~SqliteDatabase()
     {
         if (database.isOpen())
             database.close();
     }
 
+    std::vector<Utils::SmallString> names() const
+    {
+        return Sqlite::ReadStatement("SELECT name FROM test", database).values<Utils::SmallString>(8);
+    }
+
+protected:
     SpyDummy spyDummy;
     QString databaseFilePath{":memory:"};
-    Sqlite::Database database;
+    mutable Sqlite::Database database;
     Sqlite::TransactionInterface &transactionInterface = database;
     MockFunction<void(Sqlite::ChangeType tupe, char const *, char const *, long long)> callbackMock;
     Sqlite::Database::UpdateCallback callback = callbackMock.AsStdFunction();
@@ -307,4 +315,33 @@ TEST_F(SqliteDatabase, TableUpdateHookCall)
     Sqlite::WriteStatement("INSERT INTO test(name) VALUES (?)", database).write(42);
 }
 
+TEST_F(SqliteDatabase, SessionsCommit)
+{
+    database.setAttachedTables({"test"});
+    Sqlite::WriteStatement("INSERT INTO test(id, name) VALUES (?,?)", database).write(1, "foo");
+
+    Sqlite::ImmediateSessionTransaction transaction{database};
+    Sqlite::WriteStatement("INSERT INTO test(id, name) VALUES (?,?)", database).write(2, "bar");
+    transaction.commit();
+    Sqlite::WriteStatement("INSERT OR REPLACE INTO test(id, name) VALUES (?,?)", database).write(2, "hoo");
+    database.applyAndUpdateSessions();
+
+    ASSERT_THAT(names(), ElementsAre("foo", "bar"));
+}
+
+TEST_F(SqliteDatabase, SessionsRollback)
+{
+    database.setAttachedTables({"test"});
+    Sqlite::WriteStatement("INSERT INTO test(id, name) VALUES (?,?)", database).write(1, "foo");
+
+    {
+        Sqlite::ImmediateSessionTransaction transaction{database};
+        Sqlite::WriteStatement("INSERT INTO test(id, name) VALUES (?,?)", database).write(2, "bar");
+    }
+    Sqlite::WriteStatement("INSERT OR REPLACE INTO test(id, name) VALUES (?,?)", database).write(2, "hoo");
+    database.applyAndUpdateSessions();
+
+    ASSERT_THAT(names(), ElementsAre("foo", "hoo"));
+}
+
 } // namespace