diff --git a/.gitignore b/.gitignore
index 394cbad..08229a6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 example
-test/test.o
\ No newline at end of file
+test/test.o
+test/*.test
\ No newline at end of file
diff --git a/2.test b/2.test
new file mode 100644
index 0000000..e69de29
diff --git a/src/mysql.cpp b/src/mysql.cpp
index b1ed954..f46b453 100644
--- a/src/mysql.cpp
+++ b/src/mysql.cpp
@@ -122,6 +122,7 @@ mySQL::mySQL(const string _path, const string _username, const string _password,
                cout << except << endl;
             }     
          }
+         usleep(1000); // za smanjenje zauzeća procesora
       }
 
       return;
@@ -297,11 +298,15 @@ void mySQL::getColumns(const string _table, vector<string> &_columns, Connection
 Connection* mySQL::shift_con() {
    while (true) {
       io.lock();
-      for (uint i=0; i<con.size(); i++) {
+      for (int i=0; i<con.size(); i++) {
          Connection* con_ptr = con[0];
          con.pop_front();
-         io.unlock();
-         return con_ptr;
+         if (con_ptr->isValid()) {
+            io.unlock();
+            return con_ptr;
+         } else {
+            --i;
+         }
       }
       io.unlock();
    }
diff --git a/test/test.cpp b/test/test.cpp
index 0b019f8..38ee9c7 100644
--- a/test/test.cpp
+++ b/test/test.cpp
@@ -9,9 +9,11 @@ using namespace chrono;
 
 int main() {
     try {
-        mySQL mydb("tcp://192.168.2.10:3306", "dinio", "H€r5elfInd1aH@nds", "dinio", 1);
+        // mySQL mydb("tcp://192.168.2.10:3306", "dinio", "H€r5elfInd1aH@nds", "dinio", 1);
+        mySQL mydb("tcp://192.168.2.10:3306", "dinio", "H€r5elfInd1aH@nds", "dinio", 5);
 
-        sleep(3);
+        // sleep(3600*10);
+        sleep(30);
 
 
         auto start = high_resolution_clock::now();
@@ -97,28 +99,28 @@ int main() {
         // t6.join();
 
 //        one by one
-        try {
-            sqlQA test_qa;
-            test_qa.select().from("records").where("enabled = 1");
-            mydb.exec(test_qa);
-            test_qa.print(true);
-        } catch (const string err) {
-            cout << err << endl;
-        }
+        // try {
+        //     sqlQA test_qa;
+        //     test_qa.select().from("records").where("enabled = 1");
+        //     mydb.exec(test_qa);
+        //     test_qa.print(true);
+        // } catch (const string err) {
+        //     cout << err << endl;
+        // }
 
     
-        try {
-            sqlQA test_qa;
-            test_qa.select().from("users");
-            mydb.exec(test_qa);
-            test_qa.print(true);
-        } catch (const string err) {
-            cout << err << endl;
-        }
+        // try {
+        //     sqlQA test_qa;
+        //     test_qa.select().from("users");
+        //     mydb.exec(test_qa);
+        //     test_qa.print(true);
+        // } catch (const string err) {
+        //     cout << err << endl;
+        // }
 
         try {
             sqlQA test_qa;
-            test_qa.select().from("users");
+            test_qa.select("zone_id,record_type,enabled").from("records").where("domain = 'bitelex.test'");
             mydb.exec(test_qa);
             test_qa.print(true);
         } catch (const string err) {
@@ -130,7 +132,7 @@ int main() {
         auto duration = duration_cast<microseconds>(end - start);
         cout << "-------------Izvršilo se za: " << (double)(duration.count() / 1000.0) << " ms"<< endl;
         
-        sleep(100);
+        // sleep(100);
         
         
     } catch (const SQLException error) {
diff --git a/test/test.o b/test/test.o
index 4ca51da..c324384 100755
Binary files a/test/test.o and b/test/test.o differ