Fast import data to mysql in Java -


how long take insert 500.000 records csv file mysql database java code? database hosted on localhost.

table structure: ai id, | varchar(8) | datetime | int | varchar(2). code need insert 70.000 records on 40 minutes. there way faster? here main part of code:

csvreader pro  ducts = new csvreader(path); products.readheaders(); stmt = con.createstatement(); string updatestring = "insert table (t_v1, date, t_v2, t_v3) values (?,?,?,?)"; preparedstatement preparedstatement = con.preparestatement(updatestring);              while (products.readrecord()) {                 v1= products.get("v1");                 date = format.parse(products.get("date") + " " + products.get("hour"));                 java.sql.date datedb = new java.sql.date(data.gettime());                 v2 = products.get("v2");                 v3 = products.get("v3");                    preparedstatement.setstring(1, v1);                 preparedstatement.setdate(2,datedb);                 preparedstatement.setint(3, integer.parseint(v2));                 preparedstatement.setstring(4, v3);                    preparedstatement.executeupdate();             }

according advice moved creation of statement out of loop. have 33 records per second, after had 29 rps.

i might opt using load data statement mysql instead of using java:

load data local infile '/path/to/your/file.csv' table table;

this avoid lot of overhead have, assuming processing each line before inserting mysql.

you can execute load data statement java using raw jdbc.


Comments

Post a Comment

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

Image
i have page in each contest shown in row. each row contains contest id , link other model names have foreign key contest. news model: class news(models.model): title = models.charfield(max_length=50, null=true) description = models.textfield() time = models.timefield( default= datetime.datetime.now().time()) contest = models.foreignkey(contest) i want use admin adding , changing these models. want when user clicks on 'news' has foreign key contest id=1, shows list of news value foreign key. use {% instance in instances %} <tr class="{% cycle 'row1' 'row2' %}"> <td>{{ instance.title }}</td> <td>{{ instance.starttime }}</td> <td>{{ instance.timespan }}</td> <td>{{ instance.date }}</td> <td><a href="/adm...
Read more

css - Make div keyboard-scrollable in jQuery Mobile? -

from can tell, although jquery-mobile-powered pages can contain divs overflow set scroll or auto, , these divs can scrolled one-screen bar or mouse wheel, cannot scrolled using arrow keys, page-up/page-down, or home/end. instead, official "page" div (with data-role="page") absorbs input. perhaps other divs can't acquire focus, i'm not sure. is there way around this? edit: jsfiddle of simple example: https://jsfiddle.net/qogz0shx/ <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquerymobile/1.4.5/jquery.mobile.min.js"> </script> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"/> <style> #outer { overflow:scroll; height: 50vh; width: 50vw; } #inner { height: 500vh; width: 500vw; } ...
Read more

ruby on rails - Seeing duplicate requests handled with Unicorn -

recently upgraded our ec2 instances c3.large in order boost more unicorn workers handle increased traffic our site. (6xworkers per machine - 2 ec2 instances). when did this, started seeing duplicate records being created! looks somehow, maybe 2 unicorn workers attempting process same request? in nginx logs see 1 [post] request particular rails controller - yet 2 records being created in database. i'm hitting kind of race condition issue - have no idea how debug this. doesn't happen time, when it's frustrating well. noticed 2 database records within 5 seconds of each other. (and yes disable button when user clicks submit button). unicorn 4.8.2 ruby 1.9.3 rails 3.2.14 any great! thanks! although may not fix problem, upgrade ruby 2.0.0. there blog mentioning idea upgrade ruby 2.0.0 if using unicorn. for example: https://www.digitalocean.com/community/articles/how-to-optimize-unicorn-workers-in-a-ruby-on-rails-app specifically: if using ruby 1.9, ...
Read more