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1.传统写法 <if test="query.search.data.param.staff_idcard!=null and query.search.data.param.staff_idcard!='' "> and staffIdcard like '%' || #{query.search.data.param.staff_idcard} || '%' ===》oracle </if> 2.工具用法 //query.search.data.param.staff_idcard ===>传参字段 //com.tydic.commons.utils.StringUtil.isNotEmpty() ===>java方法(包名和类名用@符号包含) <if test="@com.tydic.commons.utils.StringUtil@isNotEmpty(query.search.data.param.staff_idcard)"> and staffIdcard like '%' || #{query.search.data.param.staff_idcard} || '%' ===》oracle </if>