java - netbeans DataBase retrieve data and display it another jframe textfield -


i want retrieve data , want display jframe . how pass values point . 

public void connectdb() {     try {         //setting driver java derby - select driver class connection properties         class.forname("org.apache.derby.jdbc.clientdriver");          //setting database connection through drivermanager.getconnection(dburl, dbusername, dbpwd)         con = drivermanager.getconnection(                         "jdbc:derby://localhost:1527/dbshop", //db url connection properties                         "apiit", //db username gave when creating db                         "apiit");   //db password gave when creating db          //create java.sql.statement db connection execute sql queries         stmt = con.createstatement();     } catch (classnotfoundexception ex) {      } catch (sqlexception ex) {         system.out.println("error in file");     } }//end connectdb()  public void updatepassword(string u) {     boolean flag = false;     try {          //sql update         column name   tabl name             clmn          equlng vrbl         string sql = "select lastname customerdetails firstname='" + u + "'";          //if update query successful return no. of rows affected         resultset rs = stmt.executequery(sql);         system.out.println(sql);     } catch (sqlexception ex) {         system.out.println("error in updatepasswrd");     }     // return flag; }

  1. use preparedstatement on statement. see using prepared statements more details
  2. return value query need

for example...

public string getlastname(string u) throws sqlexception {     string lastname = u;     try (preparedstatement ps = con.preparestatement("select lastname customerdetails firstname=?")){         ps.setstring(1, u);         try (resultset rs = ps.executequery()) {             if (rs.next()) {                 lastname = rs.getstring(1);             }         }     }     return lastname; }

this returns last name customer matching first name. if there more one, first result returned.

you might have @ the try-with-resources statement ideas better resource management


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