java - The correct way to update/query from DB -


i abit new working datatbases java, , have been wondering if working in correct way. in code db interface done within 1 class called dataaccess, example of code:

please note opened connection (connblng) before entering function isvalidoperator().

is correct way work or should open , close connection everytime need access db? 

if(da.startblngconnection() == null)     return "error" dataaccess da = new dataaccess(); da.isvalidoperator("123")         //this code dataaccess class public boolean isvalidoperator(string dn) {     system.out.println( npgreqid + " - " + log_tag + "inside isvalidoperator : " + dn);     preparedstatement prepstmt = null;     resultset queryresult = null;     try{         prepstmt = connblng.preparestatement("select network_id, network_identifier operators network_identifier = ?");          prepstmt.setstring(1, dn);         queryresult = prepstmt.executequery();         if (queryresult.next()) {             return true;         }     }catch(exception e){         system.out.println(npgreqid + " - "  + e);         dblog("", new date(),"" , npgreqid , "" ,"" , makesurenotoutofrange(getstacktrace(e),4000), "" , "");         return false;     } finally{         closestatmentandrs(queryresult, preparedstatement);     }      return false; }

jdbc plain not easy use api. maybe can take @ dalesbread https://github.com/blackrush/dalesbred lightwight jdbc wrapper. here discussion jdbc wrappers in common: simple jdbc wrapper.

i not suggest close db connection time, should use pooling that. creating db connection expensive.


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