java - My insert statement saves same data in two columns and omits the value of second column -

here java code:

borrowbook issue = new borrowbook(integer.parseint(txtuserid.gettext()),                                    integer.parseint(txtbookid.gettext()),                                   ((jtextcomponent)dateborrow.getdateeditor().getuicomponent()).gettext(),                                   ((jtextcomponent)datereturn.getdateeditor().getuicomponent()).gettext());  statement stmt = conn.createstatement(); string sql= "select* guest guestid= " +issue.getguestid()+ "";  rs=stmt.executequery(sql);  if(rs.next()){     //    statement stmt = conn.createstatement();     string  sql = "insert bookissue (guestid,bookid,borrowdate,returndate) values("+issue.getguestid()+ ","+issue.getbookid()+",'" +issue.getborrowdate()+ "','"+issue.getreturndate()+"')";      stmt.executeupdate(sql);     stmt.executeupdate(sql2);     joptionpane.showmessagedialog(null, "book borrowed successfully");  }else{     joptionpane.showmessagedialog(null, "id not found","error",joptionpane.error_message); } 

this mysql table output:

this table datatype

my class:

public class borrowbook extends issuebook {      public borrowbook(int guestid, int bookid, string borrowdate, string returndate) {         super(guestid,bookid, borrowdate, returndate);     }