prepared statement - PreparedStatement Delete in Java -

-

i have written code delete record in mysql database java program. compiles , runs successfully, record still in datbase. suggestions?

jbutton btndelete = new jbutton("delete"); btndelete.addactionlistener(new actionlistener() {      public void actionperformed(actionevent arg0) {          try {              object[] options = {"yes", "no"};             component form = null;             int n = joptionpane.showoptiondialog(form, "do delete record student id: " +                     textfield_16.gettext() + " ?", "exit confirmation", joptionpane.yes_no_cancel_option, joptionpane.question_message, null, options, options);              if(n == joptionpane.yes_option) {                  string mock = textfield_16.gettext();                     string sql = "delete mockexam mockid =?";                 preparedstatement prest = con.preparestatement(sql);                 prest.setstring(1, mock);                 int val = prest.executeupdate();                 joptionpane.showmessagedialog(frmdeletemock, "the record has been deleted successfully.");             }         }          catch (sqlexception e) {             e.printstacktrace();             joptionpane.showmessagedialog(frmdeletemock, "record couldn't deleted. please try again.");         }            } });  btndelete.setbounds(45, 235, 89, 23); panel_1.add(btndelete); 

prest.setstring(1, "mockid");

you looking mockid equal mockid assume want delete entry id use:

string mockid = "2"; //set want set it. prest.setstring(1, mockid); int val = prest.executeupdate(); //check val happened.

Comments

Post a Comment

Popular posts from this blog

jasper reports - Fixed header in Excel using JasperReports -

-
how can create excel report fixed header using japserreports? mean need header fixed when scroll excel file. this possible adding couple properties in jrxml file each report. take @ advanced excel features freeze panes. if wanted freeze after first column header (down left side basically) this: <statictext> <reportelement style="sans_bold" mode="opaque" x="0" y="60" width="104" height="20" forecolor="#ffffff" backcolor="#666666"> <property name="net.sf.jasperreports.export.xls.auto.filter" value="start"/> <property name="net.sf.jasperreports.export.xls.column.width" value="110"/> <property name="net.sf.jasperreports.export.xls.freeze.column.edge" value="left"/> </reportelement> &
Read more

media player - Android: mediaplayer went away with unhandled events -

-
i need duration of audio file series of voice announcements need play app. have added audio files resources , play fine. sample code below works perfect intended purpose: return duration of audio files. here code: float getdurationofaudioresource(locationenum loc, context context){ float duration = 0; try { mediaplayer mp; mp = mediaplayer.create(context, getaudioresource(loc)); duration = mp.getduration(); mp.release(); mp = null; } catch (illegalstateexception e) {e.printstacktrace(); logerror(25, "testdescitem:fault::could not open mediaplayer object audio resource.");} return duration; } here's weird thing. code called in main activity prepares set of audio instructions given test. there no errors within activity. second activity called, long string of errors on logcat. 03-07 13:23:43.820: i/actionlogger(21435): gentest_info_test #0 created. 03-07 13:23:43.830: i/actionlogger(21435): gente
Read more

python - ('The SQL contains 0 parameter markers, but 50 parameters were supplied', 'HY000') or TypeError: 'tuple' object is not callable -

-
import pyodbc,nltk,array cnxn = pyodbc.connect('driver={mysql odbc 5.1 driver};server=127.0.0.1;port=3306;database=information_schema;user=root; password=1234;option=3;') cursor = cnxn.cursor() cursor.execute("use collegedatabase ;") cursor.execute("select * sampledata ; ") cnxn.commit() s=[] j=[] x=[] words = [] w = [] sfq = [] pos=[] entry in cursor: s.append(entry.injury_type),j.append(entry.injury_desc) nltk.tokenize import punktwordtokenizer nltk.corpus import stopwords tokenizer = punktwordtokenizer() english_stops = set(stopwords.words('english')) in range(0,26): # filter stop words tokenizer.tokenize(j[i]) w.append([word word in tokenizer.tokenize(j[i]) if word not in english_stops]) in range(0 , 26):#converting tokenzied text ito string sfq.append(" ".join(w[a])) replacers import regexpreplacer replacer = regexpreplacer() in range (0,26):#pos tagging replacer.repl
Read more