diff --git a/pom.xml b/pom.xml
index ccfa759..61c1d5f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -12,7 +12,7 @@
 
     <groupId>com.loafle.overflow</groupId>
     <artifactId>crawler_sql</artifactId>
-    <version>1.0.0-SNAPSHOT</version>
+    <version>1.0.6-SNAPSHOT</version>
 
     <dependencies>
         <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
diff --git a/src/main/java/com/loafle/overflow/crawler/sql/SQLCrawler.java b/src/main/java/com/loafle/overflow/crawler/sql/SQLCrawler.java
index 4ee8127..a2db85b 100644
--- a/src/main/java/com/loafle/overflow/crawler/sql/SQLCrawler.java
+++ b/src/main/java/com/loafle/overflow/crawler/sql/SQLCrawler.java
@@ -34,6 +34,18 @@ public class SQLCrawler extends Crawler {
         String id =  (String)config.getTarget().getAuth().get("id");
         String pw =  (String)config.getTarget().getAuth().get("pw");
 
+        try {
+            if (url.contains("mysql")) {
+                Class.forName("com.mysql.jdbc.Driver");
+            }else if (url.contains("pgsql")) {
+                Class.forName("org.postgresql.Driver");
+            }else if (url.contains("sqlserver")) {
+                Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
+            }
+        }catch(Exception e) {
+
+        }
+
         List<OFResultSet> resultSets = new ArrayList<>();
 
         try {
@@ -60,17 +72,19 @@ public class SQLCrawler extends Crawler {
                 resultSets.add(resultSet);
                 rs.close();
             }
+            if (resultSets.size() <= 0) {
+                return new Exception("No data found.");
+            }
             return resultSets;
 
         } catch (Exception e) {
             e.printStackTrace();
-            new Exception(e.getMessage()).printStackTrace();
+            return e;
         } finally {
             if (conn != null) {try {conn.close();} catch (SQLException e) {e.printStackTrace();}}
             if (rs != null) {try {rs.close();} catch (SQLException e) {e.printStackTrace();}}
             if (stmt != null) {try {stmt.close();} catch (SQLException e) {e.printStackTrace();}}
         }
-        return null;
     }
 
 }