diff --git a/工具v4/database_tools_2.py b/工具v4/database_tools_2.py
index 26a787a5..e04dd087 100644
--- a/工具v4/database_tools_2.py
+++ b/工具v4/database_tools_2.py
@@ -117,11 +117,11 @@ def findsru(id,alist): #在same_list中寻找与id相同的题号
 def findsameinDB(id,database): #在数据库中寻找与id相同的题号
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    sql = "SELECT SAME_ID FROM same WHERE ID = (%s);"
+    sql = "SELECT SAME_ID FROM same WHERE ID = (%s) AND NOT obsolete;"
     val = (id,)
     mycursor.execute(sql,val)
     set1 = set([ret[0] for ret in mycursor.fetchall()])
-    sql = "SELECT ID FROM same WHERE SAME_ID = (%s);"
+    sql = "SELECT ID FROM same WHERE SAME_ID = (%s) AND NOT obsolete;"
     mycursor.execute(sql,val)
     set2 = set([ret[0] for ret in mycursor.fetchall()])
     return sorted(list(set1 | set2))
@@ -129,11 +129,11 @@ def findsameinDB(id,database): #在数据库中寻找与id相同的题号
 def findrelatedinDB(id,database): #在数据库中寻找与id关联的题号
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    sql = "SELECT RELATED_ID FROM related WHERE ID = (%s);"
+    sql = "SELECT RELATED_ID FROM related WHERE ID = (%s) AND NOT obsolete;"
     val = (id,)
     mycursor.execute(sql,val)
     set1 = set([ret[0] for ret in mycursor.fetchall()])
-    sql = "SELECT ID FROM related WHERE RELATED_ID = (%s);"
+    sql = "SELECT ID FROM related WHERE RELATED_ID = (%s) AND NOT obsolete;"
     mycursor.execute(sql,val)
     set2 = set([ret[0] for ret in mycursor.fetchall()])
     return sorted(list(set1 | set2))
@@ -141,7 +141,7 @@ def findrelatedinDB(id,database): #在数据库中寻找与id关联的题号
 def get_unit_tags(id,database):
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    sql = "SELECT tagname FROM tagcorresp WHERE ID = (%s);"
+    sql = "SELECT tagname FROM tagcorresp WHERE ID = (%s) AND NOT obsolete;"
     val = (id,)
     mycursor.execute(sql,val)
     unittags = [ret[0] for ret in mycursor.fetchall() if "单元" in ret[0]]
@@ -151,10 +151,14 @@ def get_unit_tags(id,database):
 def get_problem_content(id,database):
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    sql = "SELECT content FROM problems WHERE ID = (%s);"
+    sql = "SELECT content FROM problems WHERE ID = (%s) AND NOT obsolete;"
     val = (id,)
     mycursor.execute(sql,val)
-    content = mycursor.fetchall()[0][0]
+    ret = mycursor.fetchall()
+    if len(ret) == 0:
+        return "题目已作废"
+    else:
+        content = ret[0][0]
     mydb.close()
     return content
 
@@ -162,7 +166,7 @@ def get_problem_content(id,database):
 def generate_same_list(database):
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    mycursor.execute("SELECT ID,SAME_ID FROM same;")
+    mycursor.execute("SELECT ID,SAME_ID FROM same WHERE NOT obsolete;")
     same_list = [(ret[0],ret[1]) for ret in mycursor.fetchall()]
     mydb.close()
     return same_list.copy()
@@ -170,7 +174,7 @@ def generate_same_list(database):
 def generate_related_list(database):
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    mycursor.execute("SELECT ID,RELATED_ID FROM related;")
+    mycursor.execute("SELECT ID,RELATED_ID FROM related WHERE NOT obsolete;")
     related_list = [(ret[0],ret[1]) for ret in mycursor.fetchall()]
     mydb.close()
     return related_list.copy()
@@ -179,7 +183,7 @@ def treat_dict(database): #对整个题库字典中的内容部分进行预处
     treated_dict = {}
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    mycursor.execute("SELECT ID,content FROM problems;")
+    mycursor.execute("SELECT ID,content FROM problems WHERE NOT obsolete;")
     p_dict = {id:content for id,content in mycursor.fetchall()}
     # mycursor.execute("SELECT ID,SAME_ID FROM same;")
     # same_list = [(ret[0],ret[1]) for ret in mycursor.fetchall()]
@@ -363,6 +367,9 @@ def usedIDs(database_name): #返回已使用题号, 已更新为适合mariadb的
         start = interval[0]
         end = interval[-1]
         output += "首个已使用id: %s, 直至: %s"%(str(start).zfill(6),str(end).zfill(6)) + "\n"
+    mycursor.execute("SELECT ID FROM problems WHERE obsolete;")
+    idlist = [ret[0] for ret in mycursor.fetchall()]
+    output += f"\n已作废题号: {generate_exp(idlist)}"
     output = output.strip()
     mydb.close()
     return output #返回的是一个多行的字符串, 每一行中含有一个已使用题号的闭区间
@@ -686,7 +693,7 @@ def CreateRelatedProblems(links,database): # 根据links关联生成待编辑的
     output = "\\begin{enumerate}\n"
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    sql = "SELECT content FROM problems WHERE ID = %s;"
+    sql = "SELECT content FROM problems WHERE ID = %s AND NOT obsolete;"
     for id,rid in links:
         val = (id,)
         mycursor.execute(sql,val)
@@ -926,7 +933,7 @@ def AppendUsageData2024(prodict,field_id_and_content):
 
 def generateUsageList(db,id):
     mycursor = db.cursor()
-    mycursor.execute("SELECT date,classname,diff FROM usages WHERE ID = %s;",(id,))
+    mycursor.execute("SELECT date,classname,diff FROM usages WHERE ID = %s AND NOT obsolete;",(id,))
     tuplelist = mycursor.fetchall()
     return tuplelist
 
@@ -951,9 +958,9 @@ def ImportMetadata(db,metadatafilepath): #metadata自动修改, 根据字段自
     startdate = GetDate()
     starttime = GetTime()
     pendingusagelist = []
-    mycursor.execute("SELECT ID FROM problems;")
+    mycursor.execute("SELECT ID FROM problems WHERE NOT obsolete;")
     id_list_in_DB = [ret[0] for ret in mycursor.fetchall()]
-    mycursor.execute("SELECT objid FROM lessonobj;")
+    mycursor.execute("SELECT objid FROM lessonobj WHERE NOT obsolete;")
     obj_list_in_DB = [ret[0] for ret in mycursor.fetchall()]
     data_to_modify = ObtainDatatoModify(metadatafilepath,fieldsdict,id_list_in_DB)
     print(data_to_modify)
@@ -997,7 +1004,7 @@ def ImportMetadata(db,metadatafilepath): #metadata自动修改, 根据字段自
 
 def overwriteinDB(mydb,field,id,content_string): #覆盖ans,solution,space字段的内容并在logs中记录
     mycursor = mydb.cursor()
-    sql = f"SELECT {field} FROM problems WHERE ID = %s;"
+    sql = f"SELECT {field} FROM problems WHERE ID = %s AND NOT obsolete;"
     val = (id,)
     mycursor.execute(sql,val)
     original_string = mycursor.fetchall()[0][0]
@@ -1015,7 +1022,7 @@ def mutualappendinDB(mydb,field,id,content_string,idlist): #新增same,related,u
         smallid = min(id,id2)
         bigid = max(id,id2)
         if smallid in idlist and bigid in idlist:
-            sql = f"SELECT ID, {field.upper()}_ID from {field} WHERE ID = %s AND {field.upper()}_ID = %s;"
+            sql = f"SELECT ID, {field.upper()}_ID from {field} WHERE ID = %s AND {field.upper()}_ID = %s AND NOT obsolete;"
             val = (smallid,bigid)
             mycursor.execute(sql,val)
             ret_list = mycursor.fetchall()
@@ -1036,7 +1043,7 @@ def objappendinDB(mydb,id,content_string,objlist): #新增obj对应
         if not objid in objlist:
             print(f"{objid} 有误, 请检查!!!")
         else:
-            sql = f"SELECT ID, obj_ID FROM objcorresp WHERE ID = %s AND obj_ID = %s;"
+            sql = f"SELECT ID, obj_ID FROM objcorresp WHERE ID = %s AND obj_ID = %s AND NOT obsolete;"
             val = (id,objid)
             mycursor.execute(sql,val)
             ret_list = mycursor.fetchall()
@@ -1053,7 +1060,7 @@ def tagappendinDB(mydb,id,content_string): #新增tag对应
     mycursor = mydb.cursor()
     content_list = [item.strip() for item in content_string.split("\n") if not item.strip() == ""]
     for tag in content_list:
-        sql = f"SELECT ID, tagname FROM tagcorresp WHERE ID = %s AND tagname = %s;"
+        sql = f"SELECT ID, tagname FROM tagcorresp WHERE ID = %s AND tagname = %s AND NOT obsolete;"
         val = (id,tag)
         mycursor.execute(sql,val)
         ret_list = mycursor.fetchall()
@@ -1069,7 +1076,7 @@ def remarkappendinDB(mydb,id,content_string): #新增备注
     content_list = [item.strip() for item in content_string.split("\n") if not item.strip() == ""]
     for line in content_list:
         date,remark = parseRemark(line)
-        sql = f"SELECT ID,date,remark_content FROM remarks WHERE ID = %s AND date = %s AND remark_content LIKE %s;"
+        sql = f"SELECT ID,date,remark_content FROM remarks WHERE ID = %s AND date = %s AND remark_content LIKE %s AND NOT obsolete;"
         val = (id,date,"%"+remark+"%")
         mycursor.execute(sql,val)
         ret_list = mycursor.fetchall()
@@ -1114,7 +1121,7 @@ def usageappendinDB(mydb,id,content_string): #新增使用记录
         date = rec["date"]
         classname = rec["classid"]
         diff = rec["difficulties"]
-        sql = f"SELECT ID,date,classname,diff FROM usages WHERE ID = %s and classname = %s;"
+        sql = f"SELECT ID,date,classname,diff FROM usages WHERE ID = %s and classname = %s AND NOT obsolete;"
         val = (id,classname)
         mycursor.execute(sql,val)
         oldusage_list = mycursor.fetchall()
@@ -1277,7 +1284,7 @@ def GetSamePairs(prodict): #获取已标注的相同题目组
 
 def ShareSameUsagesinDB(id1,id2,db): #有问题， 待修改
     mycursor = db.cursor()
-    sql = "SELECT date,classname,diff FROM usages WHERE ID = (%s);"
+    sql = "SELECT date,classname,diff FROM usages WHERE ID = (%s) AND NOT obsolete;"
     val = (id1,)
     mycursor.execute(sql,val)
     id1_usages_list = mycursor.fetchall()
@@ -1365,27 +1372,27 @@ def MatchConditioninMariaDB(condition_list,database):
     }
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    mycursor.execute("SELECT ID FROM problems WHERE NOT content REGEXP 'OBS';")
+    mycursor.execute("SELECT ID FROM problems WHERE NOT obsolete;")
     match = set([u[0] for u in mycursor.fetchall()])
     for field,reverse,regexp in condition_list:
         if not field in ["same","related","usages"]:
             table,column = corr_dict[field]
-            sql = f"SELECT ID FROM {table} WHERE {column} REGEXP '{regexp}';"
+            sql = f"SELECT ID FROM {table} WHERE {column} REGEXP '{regexp}' AND NOT obsolete;"
             mycursor.execute(sql)
             newmatch = set([u[0] for u in mycursor.fetchall()])
         elif field in ["same","related"]:
             table,col0,col1 = corr_dict[field]
-            sql1 = f"SELECT {col1} FROM {table} WHERE {col0} REGEXP '{regexp}';"
+            sql1 = f"SELECT {col1} FROM {table} WHERE {col0} REGEXP '{regexp}' AND NOT obsolete;"
             mycursor.execute(sql1)
             newmatch = set([u[0] for u in mycursor.fetchall()])
-            sql2 = f"SELECT {col0} FROM {table} WHERE {col1} REGEXP '{regexp}';"
+            sql2 = f"SELECT {col0} FROM {table} WHERE {col1} REGEXP '{regexp}' AND NOT obsolete;"
             mycursor.execute(sql2)
             newmatch = newmatch | set([u[0] for u in mycursor.fetchall()])
         elif field == "usages":
             table,cols = corr_dict[field][0],corr_dict[field][1:]
             newmatch = set([])
             for i in range(len(cols)):
-                sql = f"SELECT ID FROM {table} WHERE {cols[i]} REGEXP '{regexp}';"
+                sql = f"SELECT ID FROM {table} WHERE {cols[i]} REGEXP '{regexp}' AND NOT obsolete;"
                 mycursor.execute(sql)
                 newmatch = newmatch | set([u[0] for u in mycursor.fetchall()])
         if reverse:
@@ -1643,36 +1650,39 @@ def generateDictsfromMariaDB(mycursor):
     for ret in tqdm.tqdm(ret_list,desc="生成题目字典"):
         pro_dict[ret[0]] = {"id": ret[0], "content": ret[1], "ans": ret[2], "solution": ret[3], "genre": ret[4], "duration": ret[5], "origin": json.loads(ret[6]), "space": ret[7]}
 
-    sql = "SELECT * FROM objcorresp;" #生成objs
+    sql = "SELECT * FROM objcorresp WHERE NOT obsolete;" #生成objs
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     for id in pro_dict:
         pro_dict[id]["objs"] = []
     # print("生成目标对应中...")
     for ret in tqdm.tqdm(ret_list,desc="生成目标对应"):
-        pro_dict[ret[0]]["objs"].append(ret[1])
+        if ret[0] in pro_dict:
+            pro_dict[ret[0]]["objs"].append(ret[1])
 
-    sql = "SELECT * FROM tagcorresp;" #生成tags
+    sql = "SELECT * FROM tagcorresp WHERE NOT obsolete;" #生成tags
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     for id in pro_dict:
         pro_dict[id]["tags"] = []
     # print("生成标签对应中...")
     for ret in tqdm.tqdm(ret_list,desc = "生成标签对应"):
-        pro_dict[ret[0]]["tags"].append(ret[1])
+        if ret[0] in pro_dict:
+            pro_dict[ret[0]]["tags"].append(ret[1])
 
-    sql = "SELECT * FROM usages;" #生成usages
+    sql = "SELECT * FROM usages WHERE NOT obsolete;" #生成usages
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     for id in pro_dict:
         pro_dict[id]["usages"] = []
     # print("生成使用记录中...")
     for ret in tqdm.tqdm(ret_list,desc="生成使用记录"):
-        u = "\t".join(json.loads(ret[3]))
-        if ret[1] is None:
-            pro_dict[ret[0]]["usages"].append(f"{ret[2]}\t{u}")
-        else:
-            pro_dict[ret[0]]["usages"].append(f"{ret[1]}\t{ret[2]}\t{u}")
+        if ret[0] in pro_dict:
+            u = "\t".join(json.loads(ret[3]))
+            if ret[1] is None:
+                pro_dict[ret[0]]["usages"].append(f"{ret[2]}\t{u}")
+            else:
+                pro_dict[ret[0]]["usages"].append(f"{ret[1]}\t{ret[2]}\t{u}")
 
     sql = "SELECT * FROM edit_history;" #生成edit
     mycursor.execute(sql)
@@ -1681,48 +1691,53 @@ def generateDictsfromMariaDB(mycursor):
         pro_dict[id]["edit"] = []
     # print("生成编辑历史中...")
     for ret in tqdm.tqdm(ret_list,desc="生成编辑历史"):
-        pro_dict[ret[0]]["edit"].append(f"{ret[1]}\t{ret[2]}")
+        if ret[0] in pro_dict:
+            pro_dict[ret[0]]["edit"].append(f"{ret[1]}\t{ret[2]}")
 
-    sql = "SELECT * FROM same;" #生成same
+    sql = "SELECT * FROM same WHERE NOT obsolete;" #生成same
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     for id in pro_dict:
         pro_dict[id]["same"] = []
     # print("生成same联系中...")
     for ret in tqdm.tqdm(ret_list,desc="关联相同题目"):
-        pro_dict[ret[0]]["same"].append(ret[1])
-        pro_dict[ret[1]]["same"].append(ret[0])
+        if ret[0] in pro_dict and ret[1] in pro_dict:
+            pro_dict[ret[0]]["same"].append(ret[1])
+            pro_dict[ret[1]]["same"].append(ret[0])
 
-    sql = "SELECT * FROM related;" #生成related
+    sql = "SELECT * FROM related WHERE NOT obsolete;" #生成related
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     for id in pro_dict:
         pro_dict[id]["related"] = []
     # print("生成related联系中...")
     for ret in tqdm.tqdm(ret_list,desc="关联相关题目"):
-        pro_dict[ret[0]]["related"].append(ret[1])
-        pro_dict[ret[1]]["related"].append(ret[0])
+        if ret[0] in pro_dict and ret[1] in pro_dict:
+            pro_dict[ret[0]]["related"].append(ret[1])
+            pro_dict[ret[1]]["related"].append(ret[0])
 
-    sql = "SELECT * FROM unrelated;" #生成unrelated
+    sql = "SELECT * FROM unrelated WHERE NOT obsolete;" #生成unrelated
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     for id in pro_dict:
         pro_dict[id]["unrelated"] = []
     # print("生成unrelated联系中...")
     for ret in tqdm.tqdm(ret_list,desc="关联无关题目"):
-        pro_dict[ret[0]]["unrelated"].append(ret[1])
-        pro_dict[ret[1]]["unrelated"].append(ret[0])
+        if ret[0] in pro_dict and ret[1] in pro_dict:
+            pro_dict[ret[0]]["unrelated"].append(ret[1])
+            pro_dict[ret[1]]["unrelated"].append(ret[0])
 
-    sql = "SELECT * FROM remarks;" #生成remark
+    sql = "SELECT * FROM remarks WHERE NOT obsolete;" #生成remark
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     for id in pro_dict:
         pro_dict[id]["remark"] = []
     # print("生成备注中...")
     for ret in tqdm.tqdm(ret_list,desc="生成备注"):
-        pro_dict[ret[0]]["remark"].append(f"{ret[1]}\t{ret[2]}")
+        if ret[0] in pro_dict:
+            pro_dict[ret[0]]["remark"].append(f"{ret[1]}\t{ret[2]}")
 
-    sql = "SELECT * FROM lessonobj;" #生成obj_dict
+    sql = "SELECT * FROM lessonobj WHERE NOT obsolete;" #生成obj_dict
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     # print("生成课时目标dict中...")
@@ -1738,7 +1753,7 @@ def generateDictsfromMariaDB(mycursor):
     for ret in tqdm.tqdm(ret_list,desc = "构建课时目标顺序"):
         obj_dict[ret[0]]["predecessor"].append(ret[1])
 
-    sql = "SELECT * FROM unitobj;" #生成unit_obj_dict
+    sql = "SELECT * FROM unitobj WHERE NOT obsolete;" #生成unit_obj_dict
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     # print("生成单元目标dict中...")
@@ -1746,21 +1761,22 @@ def generateDictsfromMariaDB(mycursor):
         unit_obj_dict[ret[0]] = {"unitobjid":ret[0],"unitobjcontent":ret[1]}
 
 
-    sql = "SELECT * FROM basic_knowledges;" #生成bn_dict
+    sql = "SELECT * FROM basic_knowledges WHERE NOT obsolete;" #生成bn_dict
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     # print("生成基础知识dict中...")
     for ret in tqdm.tqdm(ret_list,desc = "生成基础知识"):
         bn_dict[ret[0]] = {"bnid":ret[0],"bncontent":ret[1]}
 
-    sql = "SELECT * FROM bn_obj_corresp;" #生成bn与obj的对应
+    sql = "SELECT * FROM bn_obj_corresp WHERE NOT obsolete;" #生成bn与obj的对应
     mycursor.execute(sql)
     ret_list = mycursor.fetchall()
     for bnid in bn_dict:
         bn_dict[bnid]["objs"] = []
     # print("生成基础知识与课时目标对应中...")
     for ret in tqdm.tqdm(ret_list,desc = "对应基础知识与课时目标"):
-        bn_dict[ret[0]]["objs"].append(ret[1])
+        if ret[0] in bn_dict:
+            bn_dict[ret[0]]["objs"].append(ret[1])
     return pro_dict,obj_dict,bn_dict,unit_obj_dict
 
 def generateLaTeXBodyContentFromDict(id,adict,objdict,misc): #根据id,读取的json内容adict,和字典misc来生成讲义
@@ -1843,7 +1859,7 @@ def generateLaTeXBodyContentfromMariaDB(cursor,id,misc): #根据id,读取的json
 #     }
 # }
     id = str(id).zfill(6)
-    sql = "SELECT content,ans,solution,origin,space FROM problems WHERE ID = %s;"
+    sql = "SELECT content,ans,solution,origin,space FROM problems WHERE ID = %s AND NOT obsolete;"
     val = (id,)
     cursor.execute(sql,val)
     ret_list = cursor.fetchall()
@@ -1855,27 +1871,29 @@ def generateLaTeXBodyContentfromMariaDB(cursor,id,misc): #根据id,读取的json
             solution = ""
         origin = json.loads(raw_origin)
         #以下生成obj_list
-        sql = "SELECT obj_ID FROM objcorresp WHERE ID = %s;"
+        sql = "SELECT obj_ID FROM objcorresp WHERE ID = %s AND NOT obsolete;"
         cursor.execute(sql,val)
         ret_list = cursor.fetchall()
         obj_list = []
         for id_raw in ret_list:
             obj_id = id_raw[0]
-            sql = "SELECT obj_content FROM lessonobj WHERE objid = %s;"
+            sql = "SELECT obj_content FROM lessonobj WHERE objid = %s AND NOT obsolete;"
             if not obj_id.upper() == "KNONE":
                 objval = (obj_id,)
                 cursor.execute(sql,objval)
-                obj_list.append(f"{obj_id}\t{cursor.fetchall()[0][0]}")
+                retobj = cursor.fetchall()
+                if len(retobj) >= 1:
+                    obj_list.append(f"{obj_id}\t{retobj[0][0]}")
             else: 
                 cursor.fetchall()
                 obj_list.append(f"{obj_id}\t暂无目标对应")
-        sql = "SELECT tagname FROM tagcorresp WHERE ID = %s;"
+        sql = "SELECT tagname FROM tagcorresp WHERE ID = %s AND NOT obsolete;"
         cursor.execute(sql,val)
         tag_list = [t[0] for t in cursor.fetchall()]
-        sql = "SELECT date,remark_content FROM remarks WHERE ID = %s;"
+        sql = "SELECT date,remark_content FROM remarks WHERE ID = %s AND NOT obsolete;"
         cursor.execute(sql,val)
         remark_list = sorted([f"{t[0]}\t{t[1]}" for t in cursor.fetchall()])
-        sql = "SELECT date,classname,diff FROM usages WHERE ID = %s;"
+        sql = "SELECT date,classname,diff FROM usages WHERE ID = %s AND NOT obsolete;"
         cursor.execute(sql,val)
         usages_fetched = [(u[0] if not u[0] is None else "",u[1],json.loads(u[2])) for u in cursor.fetchall()]
         usages_raw = sorted(usages_fetched)
@@ -1943,7 +1961,7 @@ def generateLaTeXobjsfromMariaDB(cursor,objid):
     if objid == "KNONE":
         return ""
     else:
-        sql = "SELECT obj_content FROM lessonobj WHERE objid = %s;"
+        sql = "SELECT obj_content FROM lessonobj WHERE objid = %s AND not obsolete;"
         val = (objid,)
         cursor.execute(sql,val)
         obj_content = cursor.fetchall()[0][0]
@@ -1952,7 +1970,7 @@ def generateLaTeXobjsfromMariaDB(cursor,objid):
 
 def generateLaTeXbnsfromMariaDB(cursor,bnid):
     bnid = str(bnid).upper().strip()
-    sql = "SELECT bn_content FROM basic_knowledges WHERE bn_id = %s;"
+    sql = "SELECT bn_content FROM basic_knowledges WHERE bn_id = %s AND not obsolete;"
     val = (bnid,)
     cursor.execute(sql,val)
     try:
@@ -2830,7 +2848,7 @@ def unUnitted(idexp,database): #返回adict中未赋单元的id列表
     idlist = generate_number_set(idexp)
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    mycursor.execute("SELECT ID FROM tagcorresp WHERE tagname REGEXP '第\\\\S*单元' or tagname = '暂无对应';")
+    mycursor.execute("SELECT ID FROM tagcorresp WHERE tagname REGEXP '第\\\\S*单元' or tagname = '暂无对应' AND not obsolete;")
     unittedids = set([ret[0] for ret in mycursor.fetchall()])
     ununittedids = sorted(list(set(idlist)-unittedids))
     return ununittedids
@@ -3118,7 +3136,7 @@ def ChooseIDsByUsageInterval(startdate,enddate,interval,classregex,database): #
     usedproblems = []
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = database)
     mycursor = mydb.cursor()
-    sql = "SELECT ID,date,classname,diff FROM usages;"
+    sql = "SELECT ID,date,classname,diff FROM usages where NOT obsolete;"
     mycursor.execute(sql)
     usage_list = mycursor.fetchall()
     for id,date,classname,diff_raw in usage_list:
@@ -3155,7 +3173,7 @@ def getAllIDsExp(database,obsincluded = True): #获取题库中所有题目的id
     if obsincluded:
         mycursor.execute("SELECT ID FROM problems;")
     else:
-        mycursor.execute("SELECT ID FROM problems WHERE NOT content REGEXP 'OBS';")
+        mycursor.execute("SELECT ID FROM problems WHERE NOT obsolete;")
     idlist = [ret[0] for ret in mycursor.fetchall()]
     return generate_exp(idlist)
 
@@ -3173,7 +3191,7 @@ def parseRemark(string): #从一行remark字符串中分出日期和内容, 返
 
 
 def generateProDict(cursor): #从数据库的cursor中得到problems字典的content,ans,solution,genre字段
-    cursor.execute("select ID,content,ans,solution,genre,origin from problems;")
+    cursor.execute("select ID,content,ans,solution,genre,origin from problems WHERE NOT obsolete;")
     ret_list = cursor.fetchall()
     prodict = {ret[0]:{"content":ret[1],"ans":ret[2],"solution":ret[3],"genre":ret[4],"origin":json.loads(ret[5])} for ret in ret_list}
     return prodict
diff --git a/工具v4/修改目标内容.py b/工具v4/修改目标内容.py
index acea48ce..7af8a070 100644
--- a/工具v4/修改目标内容.py
+++ b/工具v4/修改目标内容.py
@@ -33,7 +33,7 @@ class MyWindow_xgmb(QWidget,Ui_Form):
         else:
             self.obj_type = "error"
         if self.obj_type == "lesson":
-            sql = "SELECT * FROM lessonobj WHERE objid = %s;"
+            sql = "SELECT * FROM lessonobj WHERE objid = %s AND NOT obsolete;"
             val = (self.id,)
             self.cursor.execute(sql,val)
             ret_list = self.cursor.fetchall()
@@ -44,7 +44,7 @@ class MyWindow_xgmb(QWidget,Ui_Form):
                 self.objcontent_raw = ret_list[0][1]
                 self.plainTextEdit_objcontent.setPlainText(self.objcontent_raw)
         elif self.obj_type == "unit":
-            sql = "SELECT * FROM unitobj WHERE unit_obj_id = %s;"
+            sql = "SELECT * FROM unitobj WHERE unit_obj_id = %s AND NOT obsolete;"
             val = (self.id,)
             self.cursor.execute(sql,val)
             ret_list = self.cursor.fetchall()
diff --git a/工具v4/关键字筛选题号.py b/工具v4/关键字筛选题号.py
index 4957beef..eb38ff08 100644
--- a/工具v4/关键字筛选题号.py
+++ b/工具v4/关键字筛选题号.py
@@ -50,7 +50,7 @@ class MyWindow_sxth(QWidget,Ui_Form):
     def exec(self):
         mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = self.database_name)
         mycursor = mydb.cursor()
-        mycursor.execute("SELECT count(*) FROM problems WHERE NOT content REGEXP 'OBS';")
+        mycursor.execute("SELECT count(*) FROM problems WHERE NOT obsolete;")
         self.lcdNumber_resCount.display(mycursor.fetchall()[0][0])
         self.matchlist = MatchConditioninMariaDB(self.conditions,self.database_name)
         self.lcdNumber_resCount.display(len(self.matchlist))
diff --git a/工具v4/删除使用记录.py b/工具v4/删除使用记录.py
index 1bdc5b00..be1c1307 100644
--- a/工具v4/删除使用记录.py
+++ b/工具v4/删除使用记录.py
@@ -31,7 +31,7 @@ class MyWindow_scjl(QWidget,Ui_Form):
         self.id = self.lineEdit_id.text().strip().zfill(6)
         self.dateregex = self.lineEdit_dateregex.text().strip()
         self.classregex = self.lineEdit_classregex.text().strip()
-        self.mycursor.execute("SELECT * FROM usages WHERE ID = %s;",(self.id,))
+        self.mycursor.execute("SELECT * FROM usages WHERE ID = %s AND not obsolete;",(self.id,))
         ret_list = self.mycursor.fetchall()
         self.usage_list = []
         for ret in ret_list:
@@ -47,15 +47,15 @@ class MyWindow_scjl(QWidget,Ui_Form):
             self.pushButton_del.setEnabled(False)
     def delete(self):
         self.mycursor = self.db.cursor()
-        self.mycursor.execute("SELECT count(*) FROM usages;")
+        self.mycursor.execute("SELECT count(*) FROM usages WHERE not obsolete;")
         print(f"预删除前有 {self.mycursor.fetchall()[0][0]} 条使用记录.")
-        sql1 = "DELETE FROM usages WHERE ID = %s AND date = %s AND classname = %s AND diff = %s;"
+        sql1 = "UPDATE usages SET obsolete = TRUE WHERE ID = %s AND date = %s AND classname = %s AND diff = %s;"
         sql2 = "INSERT INTO logs (DATE,TIME,username,action,id,db_content) VALUE (%s,%s,%s,%s,%s,%s);"
         for u in tqdm.tqdm(self.usage_list,desc = "删除使用记录"):
-            self.mycursor.execute(sql1,u)
+            self.mycursor.execute(sql1,u[:4])
             val = (GetDate(),GetTime(),get_git_username(),"删除使用记录",self.id,f"{u}")
             self.mycursor.execute(sql2,val)
-        self.mycursor.execute("SELECT count(*) FROM usages;")
+        self.mycursor.execute("SELECT count(*) FROM usages WHERE not obsolete;")
         print(f"删除后将有 {self.mycursor.fetchall()[0][0]} 条使用记录.")
         self.pushButton_commit.setEnabled(True)
     def commit(self):
diff --git a/工具v4/删除课时目标关系.py b/工具v4/删除课时目标关系.py
index 16a1d2f8..9cf4e8cb 100644
--- a/工具v4/删除课时目标关系.py
+++ b/工具v4/删除课时目标关系.py
@@ -34,7 +34,7 @@ class MyWindow_scgx(QWidget,Ui_Form):
         self.lineEdit_todelete.textChanged.connect(self.enable_del)
         self.db = connect(hostname=db_host, port=db_port, username= db_user, pwd= db_pwd, db=self.database_name)
         self.mycursor = self.db.cursor()
-        self.mycursor.execute("SELECT objid,obj_content FROM lessonobj;")
+        self.mycursor.execute("SELECT objid,obj_content FROM lessonobj WHERE not obsolete;")
         ret_list = self.mycursor.fetchall()
         self.allobjs = ""
         for ret in ret_list:
@@ -42,7 +42,7 @@ class MyWindow_scgx(QWidget,Ui_Form):
         self.plainTextEdit_objs.setPlainText(self.allobjs)
     def getobj(self):
         objid = self.lineEdit_objid.text().strip()
-        self.mycursor.execute("SELECT objid,obj_content FROM lessonobj WHERE objid = %s;",(objid,))
+        self.mycursor.execute("SELECT objid,obj_content FROM lessonobj WHERE objid = %s AND not obsolete;",(objid,))
         ret_list = self.mycursor.fetchall()
         if len(ret_list) == 0 or len(ret_list) >= 2:
             self.plainTextEdit_objs.setPlainText("目标编号有误, 请重试!!!\n\n"+self.allobjs)
@@ -55,12 +55,12 @@ class MyWindow_scgx(QWidget,Ui_Form):
             self.tableWidget_prec.setRowCount(0)
             self.tableWidget_post.clearContents()
             self.tableWidget_post.setRowCount(0)
-            self.mycursor.execute("SELECT inherit_from FROM objinherit WHERE objid = %s;",(self.objid,))
+            self.mycursor.execute("SELECT inherit_from FROM objinherit WHERE objid = %s AND not obsolete;",(self.objid,))
             ret_list = self.mycursor.fetchall()
             for ret in ret_list:
                 # print(ret)
                 count += 1
-                self.mycursor.execute("SELECT obj_content FROM lessonobj WHERE objid = %s;",(ret[0],))
+                self.mycursor.execute("SELECT obj_content FROM lessonobj WHERE objid = %s AND not obsolete;",(ret[0],))
                 prec_content = self.mycursor.fetchall()[0][0]
                 self.tableWidget_prec.insertRow(count-1)
                 self.tableWidget_prec.setItem(count-1,0,QTableWidgetItem(str(count)))
@@ -68,13 +68,13 @@ class MyWindow_scgx(QWidget,Ui_Form):
                 self.tableWidget_prec.setItem(count-1,2,QTableWidgetItem(prec_content))
                 self.corresp_list.append((count,self.objid,ret[0]))
             prec_count = count
-            self.mycursor.execute("SELECT objid FROM objinherit WHERE inherit_from = %s;",(self.objid,))
+            self.mycursor.execute("SELECT objid FROM objinherit WHERE inherit_from = %s AND not obsolete;",(self.objid,))
             ret_list = self.mycursor.fetchall()
             count = 0
             for ret in ret_list:
                 # print(ret)
                 count += 1
-                self.mycursor.execute("SELECT obj_content FROM lessonobj WHERE objid = %s;",(ret[0],))
+                self.mycursor.execute("SELECT obj_content FROM lessonobj WHERE objid = %s AND not obsolete;",(ret[0],))
                 post_content = self.mycursor.fetchall()[0][0]
                 self.tableWidget_post.insertRow(count-1)
                 self.tableWidget_post.setItem(count-1,0,QTableWidgetItem(str(count+prec_count)))
@@ -95,7 +95,7 @@ class MyWindow_scgx(QWidget,Ui_Form):
                 inherit_from = item[2]
                 break
         self.mycursor = self.db.cursor()
-        self.mycursor.execute("DELETE FROM objinherit WHERE objid = %s AND inherit_from = %s;",(objid,inherit_from))
+        self.mycursor.execute("UPDATE objinherit SET obsolete = TRUE WHERE objid = %s AND inherit_from = %s;",(objid,inherit_from))
         sql = "INSERT INTO logs (DATE,TIME,username,action,db_content) VALUE (%s,%s,%s,%s,%s);"
         val = (GetDate(),GetTime(),get_git_username(),f"删除目标关联",f"{objid} <- {inherit_from}")
         self.mycursor.execute(sql,val)
diff --git a/工具v4/单一题号转为图片.py b/工具v4/单一题号转为图片.py
index 5b0923ac..d25a32d6 100644
--- a/工具v4/单一题号转为图片.py
+++ b/工具v4/单一题号转为图片.py
@@ -26,7 +26,7 @@ class MyWindow_sctp(QWidget,Ui_Form):
         self.dpi = self.lineEdit_dpi.text()
         mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = self.database_name)
         mycursor = mydb.cursor()
-        sql = "SELECT content FROM problems WHERE ID = %s;"
+        sql = "SELECT content FROM problems WHERE ID = %s AND NOT obsolete;"
         val = (self.id.strip().zfill(6),)
         mycursor.execute(sql,val)
         content = mycursor.fetchall()[0][0]
diff --git a/工具v4/基础知识编辑.py b/工具v4/基础知识编辑.py
index 38639f45..29e3848f 100644
--- a/工具v4/基础知识编辑.py
+++ b/工具v4/基础知识编辑.py
@@ -30,7 +30,7 @@ class MyWindow_bjjc(QWidget,Ui_Form):
         self.id = self.lineEdit_bnid.text().upper()
         if not self.id[0] == "B":
             self.id = "B" + str(int(self.id)).zfill(5)
-        sql = "SELECT * FROM basic_knowledges WHERE bn_id = %s;"
+        sql = "SELECT * FROM basic_knowledges WHERE bn_id = %s AND not obsolete;"
         val = (self.id,)
         self.cursor.execute(sql,val)
         ret_list = self.cursor.fetchall()
@@ -39,7 +39,7 @@ class MyWindow_bjjc(QWidget,Ui_Form):
         else:
             self.bn_content_raw = ret_list[0][1]
         self.plainTextEdit_content.setPlainText(self.bn_content_raw)
-        sql = "SELECT * from bn_obj_corresp WHERE bn_id = %s;"
+        sql = "SELECT * from bn_obj_corresp WHERE bn_id = %s AND not obsolete;"
         val = (self.id,)
         self.cursor.execute(sql,val)
         ret_list = self.cursor.fetchall()
@@ -48,10 +48,14 @@ class MyWindow_bjjc(QWidget,Ui_Form):
         for ret in ret_list:
             count += 1
             objid = ret[1]
-            sql = "SELECT * FROM lessonobj WHERE objid = %s;"
+            sql = "SELECT * FROM lessonobj WHERE objid = %s AND not obsolete;"
             val = (objid,)
             self.cursor.execute(sql,val)
-            obj_content = self.cursor.fetchall()[0][1]
+            retcontent = self.cursor.fetchall()
+            if len(retcontent) >= 1:
+                obj_content = retcontent[0][1]
+            else:
+                obj_content = "已作废"
             self.tableWidget_obj.setItem(count-1,0,QTableWidgetItem(objid))
             self.tableWidget_obj.setItem(count-1,1,QTableWidgetItem(obj_content))
 
diff --git a/工具v4/备注信息收集.py b/工具v4/备注信息收集.py
index 21236b27..3b212ef5 100644
--- a/工具v4/备注信息收集.py
+++ b/工具v4/备注信息收集.py
@@ -20,11 +20,11 @@ def show_image():
         id = request.form['question_number'].zfill(6)
         mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = "tiku")
         mycursor = mydb.cursor()
-        sql = "SELECT content FROM problems WHERE ID = %s;"
+        sql = "SELECT content FROM problems WHERE ID = %s AND not obsolete;"
         val = (id,)
         mycursor.execute(sql,val)
         content = mycursor.fetchall()[0][0]
-        sql = "SELECT date,remark_content FROM remarks WHERE ID = %s;"
+        sql = "SELECT date,remark_content FROM remarks WHERE ID = %s AND not obsolete;"
         mycursor.execute(sql,val)
         remark_list = sorted(mycursor.fetchall(),key=lambda item:item[0],reverse=True)
         # print(remark_list)
@@ -71,7 +71,7 @@ def submit_remarks():
     # mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = "tikutest")
     mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = "tiku")
     mycursor = mydb.cursor()
-    sql = f"SELECT * FROM remarks WHERE ID = %s and remark_content = %s;"
+    sql = f"SELECT * FROM remarks WHERE ID = %s and remark_content = %s AND not obsolete;"
     val = (id,f"({category}){remarks}")
     print(f"({category}){remarks}")
     mycursor.execute(sql,val)
diff --git a/工具v4/批量收录新题.py b/工具v4/批量收录新题.py
index 883a9fa5..47f66ac4 100644
--- a/工具v4/批量收录新题.py
+++ b/工具v4/批量收录新题.py
@@ -37,7 +37,7 @@ class MyWindow_bdsl(QWidget,Ui_Form):
         mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = self.database_name)
         mycursor = mydb.cursor()
 
-        mycursor.execute("SELECT ID,content FROM problems;")
+        mycursor.execute("SELECT ID,content FROM problems WHERE NOT obsolete;")
         ret_list = mycursor.fetchall()
         pro_dict = {i:j for i,j in ret_list}
         treated_dict = {i:pre_treating(pro_dict[i]) for i in pro_dict.keys()}
diff --git a/工具v4/新增基础知识梳理.py b/工具v4/新增基础知识梳理.py
index 40e36105..4d04a2ea 100644
--- a/工具v4/新增基础知识梳理.py
+++ b/工具v4/新增基础知识梳理.py
@@ -52,7 +52,7 @@ class MyWindow_tjjc(QWidget,Ui_Form):
                     mycursor.execute(sql,val)
                     print(f"已导入基础知识 编号: {bnid},\n 内容: {content}.")
                     for objid in obj_list:
-                        sql = "SELECT * FROM lessonobj WHERE objid = %s;"
+                        sql = "SELECT * FROM lessonobj WHERE objid = %s AND NOT obsolete;"
                         val = (objid,)
                         mycursor.execute(sql,val)
                         ret =mycursor.fetchall()
diff --git a/工具v4/新增目标关系.py b/工具v4/新增目标关系.py
index 7d5d4458..b1f91589 100644
--- a/工具v4/新增目标关系.py
+++ b/工具v4/新增目标关系.py
@@ -28,7 +28,7 @@ class MyWindow_xzgx(QWidget,Ui_Form):
         self.plainTextEdit_data.textChanged.connect(self.disable_import)
         self.db = connect(hostname=db_host, port=db_port, username= db_user, pwd= db_pwd, db=self.database_name)
         self.mycursor = self.db.cursor()
-        self.mycursor.execute("SELECT objid from lessonobj;")
+        self.mycursor.execute("SELECT objid from lessonobj WHERE NOT obsolete;")
         self.objids = [item[0] for item in self.mycursor.fetchall()]
         # print(self.objids) 
         
@@ -70,7 +70,7 @@ class MyWindow_xzgx(QWidget,Ui_Form):
         for line in tqdm.tqdm(self.valid_lines):
             mainid = line[0]
             for precid in line[1]:
-                self.mycursor.execute("SELECT * FROM objinherit WHERE objid = %s AND inherit_from = %s;",(mainid,precid))
+                self.mycursor.execute("SELECT * FROM objinherit WHERE objid = %s AND inherit_from = %s AND not obsolete;",(mainid,precid))
                 ret_list = self.mycursor.fetchall()
                 if len(ret_list) >= 1:
                     output += f"*** {mainid} 以 {precid} 为前序的记录已在数据库 {self.database_name} 中\n"
diff --git a/工具v4/网页获取讲义.py b/工具v4/网页获取讲义.py
index be3a2746..01c1ef66 100644
--- a/工具v4/网页获取讲义.py
+++ b/工具v4/网页获取讲义.py
@@ -119,7 +119,7 @@ def index():
                 # raw_pro_dict = load_dict("../题库0.3/Problems.json")
                 # obj_dict = load_dict("../题库0.3/LessonObj.json")
                 # basicknowledge_dict = load_dict("../题库0.3/BasicKnowledge.json")
-                mycursor.execute("SELECT ID FROM problems;")
+                mycursor.execute("SELECT ID FROM problems WHERE NOT obsolete;")
                 id_list_in_DB = [ret[0] for ret in mycursor.fetchall()]
                 id_dict = {a:[] for a in id_list_in_DB}
                 problems_list = generate_number_set(pid,id_dict)
diff --git a/工具v4/试卷列表.py b/工具v4/试卷列表.py
index 10a46be9..fb593332 100644
--- a/工具v4/试卷列表.py
+++ b/工具v4/试卷列表.py
@@ -29,7 +29,7 @@ class MyWindow_sjlb(QWidget,Ui_Form):
         buttontext = self.sender().text()
         # print(buttontext)
         self.mycursor = self.db.cursor()
-        self.mycursor.execute("SELECT name,idexp,remark FROM papers WHERE genre = %s;",(buttontext,))
+        self.mycursor.execute("SELECT name,idexp,remark FROM papers WHERE genre = %s AND NOT obsolete;",(buttontext,))
         ret_list = self.mycursor.fetchall()
         self.tableWidget_papers.setRowCount(len(ret_list))
         count = 0
diff --git a/工具v4/题目内容直接编辑.py b/工具v4/题目内容直接编辑.py
index de6ca843..0f20022e 100644
--- a/工具v4/题目内容直接编辑.py
+++ b/工具v4/题目内容直接编辑.py
@@ -38,7 +38,7 @@ class MyWindow_bjtm(QWidget,Ui_Form):
     def showcontent(self):
         self.field = "题目内容"
         self.label_2.setText(f"题号 {self.lineEdit_ID.text()} 的 {self.field} 字段")
-        sql = "SELECT content FROM problems WHERE ID = (%s);"
+        sql = "SELECT content FROM problems WHERE ID = (%s) AND NOT obsolete;"
         val = (self.lineEdit_ID.text().zfill(6),)
         self.cursor.execute(sql,val)
         ret = self.cursor.fetchall()
@@ -50,7 +50,7 @@ class MyWindow_bjtm(QWidget,Ui_Form):
     def showgenre(self):
         self.field = "类型"
         self.label_2.setText(f"题号 {self.lineEdit_ID.text()} 的 {self.field} 字段")
-        sql = "SELECT genre FROM problems WHERE ID = (%s);"
+        sql = "SELECT genre FROM problems WHERE ID = (%s) AND NOT obsolete;"
         val = (self.lineEdit_ID.text().zfill(6),)
         self.cursor.execute(sql,val)
         ret = self.cursor.fetchall()
@@ -62,7 +62,7 @@ class MyWindow_bjtm(QWidget,Ui_Form):
     def showans(self):
         self.field = "答案"
         self.label_2.setText(f"题号 {self.lineEdit_ID.text()} 的 {self.field} 字段")
-        sql = "SELECT ans FROM problems WHERE ID = (%s);"
+        sql = "SELECT ans FROM problems WHERE ID = (%s) AND NOT obsolete;"
         val = (self.lineEdit_ID.text().zfill(6),)
         self.cursor.execute(sql,val)
         ret = self.cursor.fetchall()
@@ -74,7 +74,7 @@ class MyWindow_bjtm(QWidget,Ui_Form):
     def showsolution(self):
         self.field = "解答"
         self.label_2.setText(f"题号 {self.lineEdit_ID.text()} 的 {self.field} 字段")
-        sql = "SELECT solution FROM problems WHERE ID = (%s);"
+        sql = "SELECT solution FROM problems WHERE ID = (%s) AND NOT obsolete;"
         val = (self.lineEdit_ID.text().zfill(6),)
         self.cursor.execute(sql,val)
         ret = self.cursor.fetchall()
@@ -86,7 +86,7 @@ class MyWindow_bjtm(QWidget,Ui_Form):
     def showorigin(self):
         self.field = "来源"
         self.label_2.setText(f"题号 {self.lineEdit_ID.text()} 的 {self.field} 字段")
-        sql = "SELECT origin FROM problems WHERE ID = (%s);"
+        sql = "SELECT origin FROM problems WHERE ID = (%s) AND NOT obsolete;"
         val = (self.lineEdit_ID.text().zfill(6),)
         self.cursor.execute(sql,val)
         ret = self.cursor.fetchall()
@@ -98,7 +98,7 @@ class MyWindow_bjtm(QWidget,Ui_Form):
     def showremarks(self):
         self.field = "备注"
         self.label_2.setText(f"题号 {self.lineEdit_ID.text()} 的 {self.field} 字段")
-        sql = "SELECT date,remark_content FROM remarks WHERE ID = (%s);"
+        sql = "SELECT date,remark_content FROM remarks WHERE ID = (%s) AND NOT obsolete;"
         val = (self.lineEdit_ID.text().zfill(6),)
         self.cursor.execute(sql,val)
         ret_list = self.cursor.fetchall()