add testcase & bug fixed

src/main/java/com/alibaba/druid/mock/MockResultSet.java

@@ -77,7 +77,7 @@ public class MockResultSet extends ResultSetBase implements ResultSet {
             throw new SQLException();
         }
 
-        if (rowIndex > 0) {
+        if (rowIndex >= 0) {
             rowIndex--;
             return true;
         }

src/main/java/com/alibaba/druid/pool/DruidDataSource.java

@@ -145,10 +145,15 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
     public void restart() {
         lock.lock();
         try {
+            if (LOG.isInfoEnabled()) {
+                LOG.info("{dataSource-" + this.getID() + "} restart");
+            }
+            
             this.close();
             this.resetStat();
             this.inited = false;
             this.enable = true;
+            this.closed = false;
         } finally {
             lock.unlock();
         }

src/main/java/com/alibaba/druid/pool/DruidPooledResultSet.java

@@ -93,6 +93,10 @@ public final class DruidPooledResultSet extends PoolableWrapper implements Resul
             throw checkException(t);
         }
     }
+    
+    public int getFetchRowCount() {
+        return fetchRowCount;
+    }
 
     @Override
     public boolean wasNull() throws SQLException {