Java MySQL bulk insert vs normal -


i tried make insert mysql faster, werote code bulk insert. problem when run following code, results same (time elapsed: 2min, or 173sec) both methods. comment on matter welcome.

mysqlconn mysqlconn = new mysqlconn(db,username,pass);     connection conn =mysqlconn.getconnection();     preparedstatement ps = null;      string query = "insert table (column) values (?)";      system.out.println("bulk insert started "+10000 );     long starttime = system.currenttimemillis();      try {         ps = conn.preparestatement(query);         long start = system.currenttimemillis();         for(int =0; i<10000;i++){              ps.setstring(1, "name"+i);              ps.addbatch();              if(i%1000 == 0) ps.executebatch();         }         ps.executebatch();          system.out.println("time taken="+(system.currenttimemillis()-start));      } catch (sqlexception e) {         e.printstacktrace();     }      system.out.println("end inserting data...");      long stoptime = system.currenttimemillis();     long elapsedtime = (stoptime - starttime);       long days = timeunit.milliseconds.todays(elapsedtime);     long hours = timeunit.milliseconds.tohours(elapsedtime);     long minutes = timeunit.milliseconds.tominutes(elapsedtime);     long seconds = timeunit.milliseconds.toseconds(elapsedtime);       system.out.println("time elapsed: "+minutes+"min, or "+seconds+"sec");        system.out.println("normal insert started "+10000 );      long starttimenormal = system.currenttimemillis();      for(int i=0;i<10000;i++){          string ins="data"+i;         insert insert = new insert(conn,ins,"db.table", "column" );     }     system.out.println("end inserting data...");      long stoptimenormal = system.currenttimemillis();     long elapsedtimenormal = (stoptimenormal - starttimenormal);       long daysn = timeunit.milliseconds.todays(elapsedtime);     long hoursn = timeunit.milliseconds.tohours(elapsedtime);     long minutesn = timeunit.milliseconds.tominutes(elapsedtime);     long secondsn = timeunit.milliseconds.toseconds(elapsedtime);       system.out.println("time elapsed: "+minutesn+"min, or "+secondsn+"sec");

you use addbatch , executebatch, good, need set autocommit on connection false in order achieve faster execution times.

something along lines:

connection conn = mysqlconn.getconnection(); conn.setautocommit(false); // here  preparedstatement ps = null;  string query = "insert table (column) values (?)";  system.out.println("bulk insert started "+10000 ); long starttime = system.currenttimemillis();  try {     ps = conn.preparestatement(query);     long start = system.currenttimemillis();     for(int =0; i<10000;i++){          ps.setstring(1, "name"+i);          ps.addbatch();          if(i%1000 == 0) {             ps.executebatch();             conn.commit(); // here         }     }     ps.executebatch();     conn.commit(); // here      system.out.println("time taken="+(system.currenttimemillis()-start));  } catch (sqlexception e) {     e.printstacktrace(); }

Comments

Post a Comment

Popular posts from this blog

php - failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request -

this code i'm using find latitude , longitude of place: function coords($address){ echo $url="http://maps.googleapis.com/maps/api/geocode/json?address=".$address; $json = file_get_contents(urlencode($url)); $data = json_decode($json, true); print_r($data['results'][0]['geometry']['location']['lat']); print_r($data['results'][0]['geometry']['location']['lng']); } however returns warning: failed open stream: http request failed! http/1.0 400 bad request if use above code in simple procedure works fine not in function. note: have tried curl_init()... method produced same result? instead of encoding whole url encode address part. following code work fine $add='jamshoro phase 2'; $url="http://maps.googleapis.com/maps/api/geocode/json?address=".urlencode($add); $json = file_get_contents($url); $data = json_decode($json, true); print_r($data['r
Read more

java - How to filter a backspace keyboard input -

i have code gives message when key number pressed: txtvalueofclause.addeventfilter(keyevent.key_typed, new eventhandler<keyevent>() { @override public void handle(keyevent t) { char ar[] = t.getcharacter().tochararray(); char ch = ar[t.getcharacter().tochararray().length - 1]; if (!(ch >= '0' && ch <= '9')) { system.out.println("the char entered not number"); t.consume(); } } }); now if press on wrong button , press backspace remove it, error message. how can add backspace input if statement? i have found answer: txtvalueofclause.addeventfilter(keyevent.key_typed, new eventhandler<keyevent>() { @override public void handle(keyevent t) { char ar[] = t.getcharacter().tochararray(); char ch = ar[t.getcharacter().tochar
Read more

java - Show Soft Keyboard when EditText Appears -

i have code in android app, alert dialog , keyboard, , when dialog shown want keyboard appear. not , not sure why? here code: final alertdialog.builder alert = new alertdialog.builder(this); alert.settitle("title"); alert.setmessage("message"); final edittext input = new edittext(this); input.setinputtype(inputtype.type_class_number); alert.setview(input); input.setonfocuschangelistener(new view.onfocuschangelistener() { @override public void onfocuschange(view v, boolean hasfocus) { if (hasfocus) { log.i(tag, "in focus"); inputmethodmanager inputmethodmanager = (inputmethodmanager) getsystemservice(context.input_method_service); inputmethodmanager.showsoftinput(input, inputmethodmanager.show_implicit); } } }); but keyboard not appear though edit text in focus, , tell appear why, doesn't come up? thanks in advance.
Read more