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 a5cf7f61..9241b0e4 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
@@ -9,10 +9,6 @@ class MyWindow_sxth(QWidget,Ui_Form):
         self.database_name = database_name
         self.setupUi(self)
         self.conditions = []
-        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';")
-        self.lcdNumber_resCount.display(mycursor.fetchall()[0][0])
         self.bind()
     def setdbname(self,string):
         self.database_name = string
@@ -52,6 +48,10 @@ class MyWindow_sxth(QWidget,Ui_Form):
             text += f"字段 {field} 中{'没有' if flag_not else '有 '}{' 或 '.join([t.strip() for t in matchexp.split(',')])}\n"
         self.label_conditions.setText(text)
     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';")
+        self.lcdNumber_resCount.display(mycursor.fetchall()[0][0])
         self.matchlist = MatchConditioninMariaDB(self.conditions,self.database_name)
         self.lcdNumber_resCount.display(len(self.matchlist))