diff --git a/pom.xml b/pom.xml
index 61c1d5f..ccfa759 100644
--- a/pom.xml
+++ b/pom.xml
@@ -12,7 +12,7 @@
 
     <groupId>com.loafle.overflow</groupId>
     <artifactId>crawler_sql</artifactId>
-    <version>1.0.6-SNAPSHOT</version>
+    <version>1.0.0-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 a2db85b..96ca0ec 100644
--- a/src/main/java/com/loafle/overflow/crawler/sql/SQLCrawler.java
+++ b/src/main/java/com/loafle/overflow/crawler/sql/SQLCrawler.java
@@ -19,12 +19,11 @@ public class SQLCrawler extends Crawler {
     public SQLCrawler() {}
 
     @Override
-    public Object getInternal(Config config) {
+    public Object getInternal(Config config) throws Exception {
         return getMetrics(config);
     }
 
-
-    private Object getMetrics(Config config) {
+    private Object getMetrics(Config config) throws Exception {
 
         Connection conn = null;
         Statement stmt = null;
@@ -37,13 +36,13 @@ public class SQLCrawler extends Crawler {
         try {
             if (url.contains("mysql")) {
                 Class.forName("com.mysql.jdbc.Driver");
-            }else if (url.contains("pgsql")) {
+            }else if (url.contains("postgresql")) {
                 Class.forName("org.postgresql.Driver");
             }else if (url.contains("sqlserver")) {
                 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
             }
         }catch(Exception e) {
-
+            e.printStackTrace();
         }
 
         List<OFResultSet> resultSets = new ArrayList<>();
@@ -72,14 +71,10 @@ 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();
-            return e;
+            throw e;
         } finally {
             if (conn != null) {try {conn.close();} catch (SQLException e) {e.printStackTrace();}}
             if (rs != null) {try {rs.close();} catch (SQLException e) {e.printStackTrace();}}