diff --git a/src/database.cpp b/src/database.cpp
index 91c9e8f..3def3cb 100644
--- a/src/database.cpp
+++ b/src/database.cpp
@@ -486,7 +486,7 @@ bool Database::open(bool updateDatabase)
     }
 
     if (!d->sqlGenertor) {
-        qWarning("Sql generator for driver %s not found",
+        qFatal("Sql generator for driver %s not found",
                  driver().toLatin1().constData());
         return false;
     } else {
@@ -504,6 +504,7 @@ QSqlQuery Database::exec(QString sql)
 {
     Q_D(Database);
 
+    qInfo("Execute command: %s", qPrintable(sql));
     QSqlQuery q = d->db.exec(sql);
     if (d->db.lastError().type() != QSqlError::NoError)
         qWarning("Error executing sql command: %s; Command=%s",
diff --git a/src/databasemodel.cpp b/src/databasemodel.cpp
index 27131bf..4a7e03a 100644
--- a/src/databasemodel.cpp
+++ b/src/databasemodel.cpp
@@ -53,13 +53,14 @@ TableModel *DatabaseModel::modelByClass(QString className) const
 {
     for(int i = 0; i < size(); i++){
         TableModel *s = at(i);
+        qDebug() << s->className();
         if(s->className() == className)
             return s;
     }
 
     qWarning("Table with class name '%s' not found in model",
              qUtf8Printable(className));
-    Q_UNREACHABLE();
+//    Q_UNREACHABLE();
     return 0;
 }
 
diff --git a/src/sqlgeneratorbase.cpp b/src/sqlgeneratorbase.cpp
index 6a401cb..26e6b92 100644
--- a/src/sqlgeneratorbase.cpp
+++ b/src/sqlgeneratorbase.cpp
@@ -111,7 +111,7 @@ QString SqlGeneratorBase::diff(FieldModel *oldField, FieldModel *newField)
         sql = "DROP COLUMN " + oldField->name;
     }else{
         if(oldField)
-            sql = "ALTER COLUMN ";
+            sql = "MODIFY COLUMN ";
         else
             sql = "ADD COLUMN ";
         sql.append(fieldDeclare(newField));