修改 新增基础知识梳理 中的一个bug

工具v4/新增基础知识梳理.py

@@ -20,13 +20,14 @@ class MyWindow_tjjc(QWidget,Ui_Form):
         self.pushButton_exec.clicked.connect(self.execstep1)
         self.pushButton_commit.clicked.connect(self.commitstep)
         self.pushButton_commit.setDisabled(True)
-        self.mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = self.database_name)
+        
         
     def selectfilepath(self):
         self.filepath = QFileDialog.getOpenFileName(self,"选择.tex文件",os.getcwd(),"tex文件(*.tex);;所有文件(*)")[0]
         self.lineEdit_filepath.setText(self.filepath)
         self.pushButton_exec.setEnabled(True)
     def execstep1(self):
+        self.mydb = connect(hostname = db_host, port = db_port, username=db_user, pwd=db_pwd, db = self.database_name)
         mycursor = self.mydb.cursor()
         mycursor.execute("SELECT bn_id FROM basic_knowledges;")
         bnids = [ret[0] for ret in mycursor.fetchall()]