https://www.heckjj.com/index.php zh-cn https://www.heckjj.com/post// Heck <@hecks.tk> Mon, 22 Aug 2016 07:35:23 +0000 https://www.heckjj.com/post// <foreach collection="condition.keys" item="k" separator="and">       ${k} = #{k}     </foreach>  

循环values
<foreach collection="condition.values" item="v" separator="and">       ${v} = #{v}     </foreach>  


循环获取key和值：
<foreach collection="condition.keys" item="k" separator="and">       <if test="null != condition[k]">             ${k} = ${condition[k]}         </if>   </foreach>  

通常我们设置值的时候，会以#{}的方式，而不是${}，如下
<foreach collection="condition.keys" item="k" separator="and">       <if test="null != condition[k]">             ${k} = #{condition[k]}         </if>   </foreach>  

但是用这种方式，会发现，取不了值了，${condition[k]}  能取的出值，但#{condition[k]} 取出来的值却实null，正确的写法应该是：
<foreach collection="condition.keys" item="k" separator="and">       <if test="null != condition[k]">             ${k} = #{condition[${k}]}       </if>   </foreach>  
]]> https://www.heckjj.com/post//#blogcomment <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 https://www.heckjj.com/post//#blogcomment