if 语句查询判断中文有问题.

我的表和字段是GBK字符编码，select fr_date as date,fr_name as username,fr_rmb as amt,if(fr_zhye='冻结','消费','存入') as type,'本金' as fundtype,fr_type as leibie,fr_zhye as balance,fr_bank as remark,
        fr_site as site from th_zhmx_freeze
fr_zhye字段也是中文值，查出的结果type竟然没按条件显示出来（fr_type值是“冻结”的也显示“存入”）,且字段值没有空字符串。