Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Z/src/ngldb/dbtransaction.cpp

@@ -0,0 +1,82 @@
+
+
+
+#include "dbtransaction.h"
+#include "ngldb_logger.h"
+#include <QtSql/QSqlError>
+
+thread_local int s_refCounter = 0;
+
+DBTransaction::DBTransaction(const QSqlDatabase &db)
+  : m_db(db)
+  , m_bCommitted(true)
+  , mLogger(NGLDB::getLogger("DBTransaction"))
+{
+  ++s_refCounter;
+  if (s_refCounter == 1)
+    begin();
+}
+
+DBTransaction::~DBTransaction()
+{
+  if (s_refCounter == 1)
+  {
+    if (!m_bCommitted)
+      rollback();
+  }
+  --s_refCounter;
+}
+
+bool DBTransaction::begin()
+{
+  if (!m_bCommitted)
+    return setState(false);
+  if (!m_db.transaction())
+  {
+    ERROR_LOG(mLogger) << "Error starting a transaction: " << m_db.lastError().driverText();
+    return setState(false);
+  }
+  m_bCommitted = false;
+  return setState(true);
+}
+
+bool DBTransaction::commit()
+{
+  if (s_refCounter == 1)
+  {
+    if (!m_db.commit())
+    {
+      ERROR_LOG(mLogger) << "Error committing a transaction: " << m_db.lastError().driverText();
+      return setState(false);
+    }
+    m_bCommitted = true;
+    return setState(true);
+  }
+  return true;
+}
+
+bool DBTransaction::rollback()
+{
+  if (s_refCounter == 1)
+  {
+    if (!m_db.rollback())
+    {
+      ERROR_LOG(mLogger) << "Error rolling back a transaction" << m_db.lastError().driverText();
+      return setState(false);
+    }
+    m_bCommitted = true;
+    return setState(true);
+  }
+  return true;
+}
+
+bool DBTransaction::state() const
+{
+  return m_lastState;
+}
+
+bool DBTransaction::setState(bool bState)
+{
+  m_lastState = bState;
+  return m_lastState;
+}