public class DbWhere {

    /** 没有查询条件的空Where **/
    public static final DbWhere NONE = new ReadonlyWhere();

    public DbWhere() {
        log(this.getClass(), "DbWhere<init>()");
    }

    static void log(Class<?> clazz, String msg) {
        System.out.println(Thread.currentThread().getName() + ' ' + clazz.getSimpleName() + '-' + msg);
    }
}