fix bug for non SQLException not thrown (#834)

Author: leizhiyuan

rm-datasource/src/main/java/io/seata/rm/datasource/exec/ExecuteTemplate.java

@@ -72,8 +72,8 @@ public static <T, S extends Statement> T execute(SQLRecognizer sqlRecognizer,
 
         if (sqlRecognizer == null) {
             sqlRecognizer = SQLVisitorFactory.get(
-                statementProxy.getTargetSQL(),
-                statementProxy.getConnectionProxy().getDbType());
+                    statementProxy.getTargetSQL(),
+                    statementProxy.getConnectionProxy().getDbType());
         }
         Executor<T> executor = null;
         if (sqlRecognizer == null) {
@@ -102,12 +102,11 @@ public static <T, S extends Statement> T execute(SQLRecognizer sqlRecognizer,
             rs = executor.execute(args);
 
         } catch (Throwable ex) {
-            if (ex instanceof SQLException) {
-                throw (SQLException)ex;
-            } else {
-                // Turn everything into SQLException
-                new SQLException(ex);
+            if (!(ex instanceof SQLException)) {
+                // Turn other exception into SQLException
+                ex = new SQLException(ex);
             }
+            throw (SQLException)ex;
         }
         return rs;
     }