java - How to sum data from specific record? -

- 

    ___worker_id___|_______occur________           20       |         1           20       |         2           21       |         3           22       |         5           20       |         1       according table, need know each worker how many occur?      such   worker_id=20 has occur 4                   worker_id=21 has occur 8

i can 2 value worker table code

         string sql = "select table.worker_id,table.occur keyword_pages table"             + " keyword_id=" + puid;          conn = getconnection();         stm = conn.createstatement();         rs = stm.executequery(sql);         while (rs.next()) {             int kwd_id = rs.getint(1);    /**worker_id 20,20,21,22,20*/             int occur = rs.getint(2);     /**worker_id 1,2,3,5,1*/                    }

how amount of occur each worker?

this coding. use hashmap store each record. , store hashmap linklist. haven't idea result.

  conn = getconnection();         stm = conn.createstatement();         rs = stm.executequery(sql);         while (rs.next()) {             int kwd_id = rs.getint(1);             int occur = rs.getint(2);             hmap.put(kwd_id, occur);             listid.add(hmap);             //system.out.println(kwd_id +"  |  "+ occur);         }          (int = 0; < listid.size(); i++) {           }           

string sql = "select t.worker_id, sum(t.occur) osum"         + " keyword_pages t"         + " keyword_id=" + puid         + " group t.worker_id";

now rs.getint(2) or rs.getint("osum") give group's sum.


Comments

Post a Comment

Popular posts from this blog

sql server - MSSQL Text and Varchar(MAX) fields shown (MEMO) in DBGrid -

-
Image
i have encountered problem in mssql & delphi xe3. text , varchar(max) fields seemed (memo) or (widememo) in tdbgrid & tdbadvgrid (tms dbgrid). in first screenshot can see table fiels, in second screentshot can see sample data in database: in screenshot, see how in dbgrid or in query results. i figured out changing field type char , varchar not max solves issue don't know why having problem. can please let me know?
Read more

qml - Is it possible to implement SystemTrayIcon functionality in Qt Quick application -

-
i writing qtquick desktop application. use both c++ (for functionality) , qml (for ui) in it. use qquickview show interface written in qml. i want application reside in system tray when minimised. i mean functionality similar example. http://qt-project.org/doc/qt-4.8/desktop-systray.html . trying implement feature not find way in qt quick application. here main.cpp code: #include <qguiapplication> #include <qqmlengine> #include <qqmlcontext> #include <qqmlfileselector> #include <qquickview> #include "myapp.h" int main(int argc, char* argv[]) { qguiapplication app(argc,argv); app.setapplicationname(qfileinfo(app.applicationfilepath()).basename()); qdir::setcurrent(qapp->applicationdirpath()); myapp myappobject; qquickview view; view.connect(view.engine(), signal(quit()), &app, slot(quit())); view.rootcontext()->setcontextproperty("myappobject", &myappobject); new qqmlfilese...
Read more

mysql - Flyway migration, Unable to obtain Jdbc connection from DataSource -

-
i trying use flyway create , manage mysql database. here code have got far. flywaymigration.java : class applys migration public class flywaymigration { public flywaymigration(databaseconfiguration configuration, flyway flyway) { flyway.setdatasource(configuration.getdatasource()); flyway.migrate(); } public static void main(string[] args) { new flywaymigration(new databaseconfiguration("database.properties"), new flyway()); } } databaseconfiguration.java : configuration class, class configure datasource applyed flyway.setdatasource method public class databaseconfiguration { private final logger logger = loggerfactory.getlogger(this.getclass()); private propertiesutil prop = null; public databaseconfiguration(string file) { prop = new propertiesutil(file); } public string getdatasourceclass() { return prop.getproperty("mysql.data.source.class"); } pu...
Read more