Vert.x and SQL - JDBCConnectionImpl.java

public SQLConnection queryWithParams(String sql, 
                                     JsonArray params, 
                                     Handler<AsyncResult<ResultSet>> resultHandler) {
    new JDBCQuery(vertx, 
        helper, 
        options, 
        ctx, 
        sql, 
        params).execute(conn, 
            statementsQueue, 
            resultHandler);
    return this;
}