diff --git a/PythonProject/api/statistics_api.py b/PythonProject/api/statistics_api.py
index 401efd1..c5f0032 100644
--- a/PythonProject/api/statistics_api.py
+++ b/PythonProject/api/statistics_api.py
@@ -40,3 +40,8 @@ def get_days(db=Depends(get_db)):
 def get_emp(db=Depends(get_db)):
     l= select_days(db)
     return l
+
+@StatisticsAPI.get('/salaries',summary='统计薪资分布')
+def get_salaries(db=Depends(get_db)):
+    s=classify_salary(db)
+    return s
\ No newline at end of file
diff --git a/PythonProject/api/student_api.py b/PythonProject/api/student_api.py
index 3b1bb2b..2cf2f1d 100644
--- a/PythonProject/api/student_api.py
+++ b/PythonProject/api/student_api.py
@@ -32,11 +32,16 @@ def update_students(s:StudentRequest
                     ,stu_id:int
                     ,db=Depends(get_db)):
     d = s.model_dump(exclude_unset=True)
+    d.pop('stu_id', None)
     if not d:
         raise HTTPException(status_code=400, detail='更新内容不能为空')
     r = update_student_dao( stu_id=stu_id,update_data=d,db=db )
+    if r == 'conflict':
+        raise HTTPException(status_code=409, detail = '身份证号已被其他学生占用')
+    if r == 'error':
+        raise HTTPException(status_code=500, detail='更新失败，请稍后重试')
     if not r:
-        raise HTTPException(status_code=500, detail='没有更新')
+        raise HTTPException(status_code=404, detail='没有更新')
     return {'code':200,'totals':r,'detail':'更新成功'}
 
 @StudentAPI.delete('/{stu_id}',summary='学生信息删除接口',description='删除学生信息')
diff --git a/PythonProject/dao/statistics_dao.py b/PythonProject/dao/statistics_dao.py
index c576206..edcc645 100644
--- a/PythonProject/dao/statistics_dao.py
+++ b/PythonProject/dao/statistics_dao.py
@@ -131,4 +131,26 @@ def select_days(db):
                      ).filter(Employment_info.delete_status == 0).all()
         return l2
     except Exception:
-        raise HTTPException(status_code=500, detail="查询异常")
\ No newline at end of file
+        raise HTTPException(status_code=500, detail="查询异常")
+
+
+# 薪资区间分布：统计薪资在5k以下、5k-10k、10k-15k、15k以上的人数分布，反映学生的整体就业质量。
+def classify_salary(db):
+    try:
+        a=b=c=d=0
+        l=db.query(Employment_info).filter(Employment_info.delete_status==0).all()
+        for i in l:
+            if i.salary is None:
+                continue
+            elif i.salary<5000:
+                a+=1
+            elif 5000<=i.salary<10000:
+                b+=1
+            elif 10000<=i.salary<15000:
+                c+=1
+            else:
+                d+=1
+        return {'5k以下': a, '5k-10k': b, '10k-15k': c, '15k': d}
+    except:
+        raise HTTPException(status_code=500,detail='查询异常！')
+
diff --git a/PythonProject/dao/student_dao.py b/PythonProject/dao/student_dao.py
index 0822d9d..d947d0d 100644
--- a/PythonProject/dao/student_dao.py
+++ b/PythonProject/dao/student_dao.py
@@ -36,16 +36,29 @@ def delete_student_dao(stu_id,db):
         return rows
 
 def update_student_dao(stu_id,update_data,db):
+    if update_data.get('id_card'):
+        conflict = (db.query(Student_Model)
+                    .filter(Student_Model.id_card == update_data['id_card'],
+                            Student_Model.stu_id != stu_id,
+                            Student_Model.delete_status == 0)
+                    .first())
+        if conflict:
+            return 'conflict'
+
     try:
-        rows=(db.query(Student_Model)
-              .fiter(Student_Model.stu_id == stu_id,Student_Model.delete_status == 0)
-              .update(update_data))
-    except:
-        db.rollback()
-        return False
-    else:
+        rows = (db.query(Student_Model)
+                .filter(Student_Model.stu_id == stu_id,
+                        Student_Model.delete_status == 0)
+                .update(update_data))
         db.commit()
-        return rows
+    except IntegrityError:
+        db.rollback()
+        return 'conflict'
+    except Exception:
+        db.rollback()
+        return 'error'
+
+    return rows
 
 def get_student_dao(stu_id:Optional[int]
                    ,stu_name:Optional[str]
diff --git a/PythonProject/model/all_model.py b/PythonProject/model/all_model.py
index eccb6e9..55a9790 100644
--- a/PythonProject/model/all_model.py
+++ b/PythonProject/model/all_model.py
@@ -1,5 +1,7 @@
-from sqlalchemy import DATETIME,Column,Integer,String,DATE,ForeignKey,Numeric,UniqueConstraint
-from datetime import datetime
+
+
+from sqlalchemy import DATETIME,Column,Integer,String,DATE,ForeignKey,Numeric,Date
+from datetime import datetime,date
 from util.database import Base,engine
 
 class Student_Model(Base):
@@ -64,7 +66,7 @@ class ClassManagement(Base):
 
     class_teacher_id = Column(Integer,ForeignKey('wl_teacher.teac_id'),comment='授课教师')
 
-    Entry_date= Column(DATETIME,default=datetime.now,comment='录入时间')
+    Entry_date= Column(Date,default=date.today,comment='录入时间')
 
     update_date = Column(DATETIME,default=datetime.now,onupdate=datetime.now,comment='更新时间')