i have the below code when run my preogram not showing any error but also not inserting value in sql database table

String query="insert into Answers (ID,Ques_ID,Answer) select q.ID,q.Ques_ID,'"+txtboxAddAnswer+"' from Questions q where q.Question='"+passingQuestion+"';";
        Class.forName("com.microsoft.Sqlserver.jdbc.Sqlserverdriver");
        Connection conn=DriverManager.getConnection("jdbc:sqlserver://localhost/H-AHMADRAZA:1433;databaseName=TestJava","testjava","ahmad");
        PreparedStatement st=conn.prepareStatement(query);
        st.executeUpdate(query);
       conn.close();