根据书号返回信息接口，增加使用班级信息返回

src/main/java/com/xjrsoft/module/textbook/service/impl/TextbookServiceImpl.java

@@ -450,7 +450,12 @@ public class TextbookServiceImpl extends MPJBaseServiceImpl<TextbookMapper, Text
 
     @Override
     public TextbookVo getInfoByissn(String issn) {
-        return textbookTextbookMapper.getInfoByissn(issn);
+        TextbookVo infoByissn = textbookTextbookMapper.getInfoByissn(issn);
+        List<TextbookClassRelation> classRelationList = textbookTextbookClassRelationMapper.selectList(
+                new QueryWrapper<TextbookClassRelation>().lambda().eq(TextbookClassRelation::getTextbookId, infoByissn.getId())
+        );
+        infoByissn.setTextbookClassRelationList(BeanUtil.copyToList(classRelationList, TextbookClassRelationVo.class));
+        return infoByissn;
     }
 
     @Override

src/main/java/com/xjrsoft/module/textbook/vo/TextbookVo.java

@@ -110,6 +110,7 @@ public class TextbookVo {
     /**
      * 入学年级(base_grade)
      */
-    @ApiModelProperty("textbookClassRelation子表")
+    @ApiModelProperty("使用班级")
     private List<TextbookClassRelationVo> textbookClassRelationList;
+
 }