当尝试使用按钮在delphi中运行SQL查询时，没有任何反应！

I am trying to run SQL queries using a button click in Delphi, the database is successfully connected everything compiles fine when i enter the query i.e. "Select * from StaffDetails" and then click on run expecting it to show me the results in the DBGrid nothing happens at all the code for the button is as follows I am trying to run SQL queries using a button c