java - While ResultSet is not executing? -


i trying call 2 sets of data 2 different tables display in jtextarea (jtadisplay). first table (emp_db) employee number, name , surname. second table (sec_clearance) employee security clearance level.

the method placed in constructor execute when frame starts up, whenever run frame not display data. no error messages come , stack trace doesn't display error messages.

i placed joptionpane in various places inside method see problem lies , found while(rs.next()) statement not executing joptionpane displays outside while statement not inside it.

here code have:

try         {             string user = txtemptitle.gettext();             string encuser = encrypt(user); //encrypting employee number aes read in database             string getempnum = "select * emp_db emp_num = '" + encuser + "'";             string getseclevel = "select seclevel sec_clearance emp_num = '" + encuser + "'";             class.forname("com.mysql.jdbc.driver");             connection conn = (connection)                     drivermanager.getconnection("jdbc:mysql://localhost:3306/employee_database","root","pass123");             statement stmt=conn.createstatement();             statement stmt2=conn.createstatement();             resultset rs = stmt.executequery(getempnum);             resultset rs2 = stmt2.executequery(getseclevel);              while(rs.next() && rs2.next())             {                 string empnum = rs.getstring("emp_num");                 string empname = rs.getstring("fname");                 string empsname = rs.getstring("sname");                 string empseclevel = rs2.getstring("seclevel");                  //decrypting data in database                 string decnum = empeditdb.decrypt(empnum);                 string decname = empeditdb.decrypt(empname);                 string decsname = empeditdb.decrypt(empsname);                 string decseclevel = empeditdb.decrypt(empseclevel);                  jtadisplay.settext("employee number: " + decnum +                          "\nemployee name: " + decname + " " + decsname +                          "\nsecurity clearance: " + decseclevel);             }          }         catch(exception e)         {             joptionpane.showmessagedialog(this, e);         }

how can code in while statement execute , display data in jtextarea?

only if have record ,it come while loop.better use preparedstatement dynamic value setting.for debugging purpose try print query in debugging , copy query , execute in sql tool checking whether records.


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