mysql - SQL - Java/Eclipse - UPDATE statement query [Re-asked, to insert more code] -


so want "update 'usertype' column in 'user' table email(/user) value obtained textbox " below database connection code (which 100% works)

import java.sql.connection; import java.sql.drivermanager; import java.sql.statement;  import javax.swing.joptionpane;  public class database_link  {     connection connect = null;     statement state = null;     public static connection dbconnector()     {         try{             class.forname("org.hsqldb.jdbcdriver");             connection connect = drivermanager.getconnection("jdbc:hsqldb:file: // db path  )              joptionpane.showmessagedialog(null, "connection successful");             return connect;              }         catch (exception e) {                 joptionpane.showmessagedialog(null, "failed connection");                 return null;             }         }  }

below sql statement code error "the operator & undefined argument type(s) java.lang.string, java.lang.string"

 jbutton grantbutton = new jbutton("grant seller access");             grantbutton.addactionlistener(new actionlistener() {                 public void actionperformed(actionevent arg0) {                     try {      string update_query = "update user set usertype = 'seller' email = " & grantfield.gettext()";"                             //here error stated on eclipse                  preparedstatement pst = connect.preparestatement(update_query);                         pst.setstring(1, grantfield.gettext());                          pst.execute();                          joptionpane.showmessagedialog(null,                                 "the request has been approved");                      } catch (exception e) {                         e.printstacktrace();                     }                  }              });

sorry have repeated question

    string update_query = "update user set usertype = 'seller' email = " & grantfield.gettext()";"

should like

    string update_query = "update user set usertype = 'seller' email = ?"

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