diff --git a/src/main/java/com/example/caseData/common/Response.java b/src/main/java/com/example/caseData/common/Response.java
index 64cea5d..e9de697 100644
--- a/src/main/java/com/example/caseData/common/Response.java
+++ b/src/main/java/com/example/caseData/common/Response.java
@@ -5,6 +5,8 @@ import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
diff --git a/src/main/java/com/example/caseData/controller/CaseExchangeController.java b/src/main/java/com/example/caseData/controller/CaseExchangeController.java
index d43a21f..e3887df 100644
--- a/src/main/java/com/example/caseData/controller/CaseExchangeController.java
+++ b/src/main/java/com/example/caseData/controller/CaseExchangeController.java
@@ -278,14 +278,6 @@ public class CaseExchangeController {
     ) {
         request.validateForLimit();
 
-
-//        LambdaQueryWrapper<CaseExchangeModel> selectedQueryWrapper = new LambdaQueryWrapper<>();
-//        selectedQueryWrapper.eq(CaseExchangeModel::getExchangeStatus, 1)  // 上线状态
-//                .eq(CaseExchangeModel::getIsSelected, 1)
-//                .orderByDesc(CaseExchangeModel::getCreatedAt) // 按发布时间倒序
-//                .last("LIMIT 3"); // 只取2条记录
-//        List<CaseExchangeModel> selectedExchanges = caseExchangeDao.selectList(selectedQueryWrapper);
-
         // 获取数据
         List<CaseExchangeDto> caseExchanges = caseExchangeDao.getCaseExchangeSearchList(
                 request.getLimit(),
diff --git a/src/main/resources/mapper/CaseExchangeMapper.xml b/src/main/resources/mapper/CaseExchangeMapper.xml
index 6a3f30c..ad30fd8 100644
--- a/src/main/resources/mapper/CaseExchangeMapper.xml
+++ b/src/main/resources/mapper/CaseExchangeMapper.xml
@@ -13,7 +13,7 @@
             LEFT JOIN case_exchange_label b ON a.exchange_id = b.exchange_id
             LEFT JOIN user c ON c.user_id = a.user_id
             WHERE a.exchange_status = 1
-            <if test="isSelected != null and isSelected != ''">
+            <if test="isSelected != null">
                 AND a.is_selected = ${isSelected}
             </if>
             <if test="keyword != null and keyword != ''">
@@ -49,7 +49,7 @@
             LEFT JOIN case_exchange_label b ON a.exchange_id = b.exchange_id
             LEFT JOIN user c ON c.user_id = a.user_id
             WHERE a.exchange_status = 1
-            <if test="isSelected != null and isSelected != ''">
+            <if test="isSelected != null">
                 AND a.is_selected = #{isSelected}
             </if>
             <if test="keyword != null and keyword != ''">