大佬们，这个应该怎么改，${if(len(yg) == 0,""," and fzrh = '"select gh from jg_jzgjcsj where xm = '${yg}'"'")}
gh字段只有一个值？如果返回多行数据呢？
${if(len(yg) == 0,""," and fzrh = (select gh from jg_jzgjcsj where xm ='"+yg+"')")}
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