diff --git a/CrawlerProcess/scrawler.cpp b/CrawlerProcess/scrawler.cpp
index 3acafd5..ea7c84c 100644
--- a/CrawlerProcess/scrawler.cpp
+++ b/CrawlerProcess/scrawler.cpp
@@ -302,8 +302,12 @@ void SCrawler::saveFrameList(QWebFrame *frame)
         QString strQuery = "delete from ";
         strQuery += m_strTable;
         strQuery += QString(" where article_url = 'http://%1'").arg(strUrl);
-        sql.exec(strQuery);
 
+        if (sql.exec(strQuery) == false)
+        {
+            cout << "error " << sql.lastError().text().toStdString();
+            cout << strQuery.toStdString();
+        }
 
         //if (sql.size() == 0 || sql.size() == -1)
         {
@@ -723,7 +727,13 @@ void SCrawler::saveFrameCafeList(QWebFrame *frame)
                 QString strQuery = "delete from ";
                 strQuery += m_strTable;
                 strQuery += QString(" where article_url = 'http://%1'").arg(strUrl);
-                sql.exec(strQuery);
+
+                if (sql.exec(strQuery) == false)
+                {
+                    cout << "error " << sql.lastError().text().toStdString();
+                    cout << strQuery.toStdString();
+                }
+
                 //if (sql.size() == 0 || sql.size() == -1)
                 {
                     QString strQuery = QString("insert into ");
@@ -944,7 +954,12 @@ void SCrawler::saveFrameDaumCafeList(QWebFrame *frame)
                 QString strQuery = "delete from ";
                 strQuery += m_strTable;
                 strQuery += QString(" where article_url = 'http://%1'").arg(strUrl);
-                sql.exec(strQuery);
+                if (sql.exec(strQuery) == false)
+                {
+                    cout << "error " << sql.lastError().text().toStdString();
+                    cout << strQuery.toStdString();
+                }
+
                 {
                     QString strQuery = QString("insert into ");
                     strQuery += m_strTable;