java - It asks for id and asks for name and then shows exception saying error in MySql syntax...how do i resolve? -


this question has answer here:

i have tried both ways queryupdate, shows same exception.

string queryupdate = "update student set name = '?' id = '?' ";

string queryupdate = "update student set name = ? id = ? ";

import java.io.bufferedreader; import java.io.ioexception; import java.io.inputstreamreader; import java.sql.connection; import java.sql.sqlexception; import java.sql.statement; import java.util.scanner;   public class updaterecord  { private connection connection; statement statement; string queryupdate = "update student set name = ? id = ? ";  scanner sc = new scanner(system.in); bufferedreader buffer = new bufferedreader(new inputstreamreader(system.in));  public updaterecord() {     try     {         class.forname("com.mysql.jdbc.driver");         connection = createconnection.getdatabase();    // creating connection class created in file createconnection.java          statement = connection.preparestatement(query);          system.out.println("enter id...");         int id = integer.parseint(buffer.readline());          system.out.println("enter name...");         string name = buffer.readline();          statement.executeupdate(query);          system.out.println("\n\n\t\t!!!.........updated..........!!!");      }     catch(classnotfoundexception e)     {         e.printstacktrace();     }     catch(sqlexception s)     {         s.printstacktrace();     }     catch(ioexception i)     {         i.printstacktrace();     }  }  public static void main(string[] args)  {     new updaterecord(); } }

mysql exception:

class loaded connection created enter id... 1 enter name... hamid com.mysql.jdbc.exceptions.jdbc4.mysqlsyntaxerrorexception: you have error in sql syntax; check manual corresponds mysql server version right syntax use near '? id = ?' @ line 1 @ sun.reflect.nativeconstructoraccessorimpl.newinstance0(native method) @ sun.reflect.nativeconstructoraccessorimpl.newinstance(nativeconstructoraccessorimpl.java:62) @ sun.reflect.delegatingconstructoraccessorimpl.newinstance(delegatingconstructoraccessorimpl.java:45) @ java.lang.reflect.constructor.newinstance(constructor.java:423) @ com.mysql.jdbc.util.handlenewinstance(util.java:406) @ com.mysql.jdbc.util.getinstance(util.java:381) @ com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:1031) @ com.mysql.jdbc.sqlerror.createsqlexception(sqlerror.java:957) @ com.mysql.jdbc.mysqlio.checkerrorpacket(mysqlio.java:3376) @ com.mysql.jdbc.mysqlio.checkerrorpacket(mysqlio.java:3308) @ com.mysql.jdbc.mysqlio.sendcommand(mysqlio.java:1837) @ com.mysql.jdbc.mysqlio.sqlquerydirect(mysqlio.java:1961) @ com.mysql.jdbc.connectionimpl.execsql(connectionimpl.java:2537) @ com.mysql.jdbc.statementimpl.executeupdate(statementimpl.java:1564) @ com.mysql.jdbc.statementimpl.executeupdate(statementimpl.java:1485) @ updaterecord.(updaterecord.java:34) @ updaterecord.main(updaterecord.java:56)

it seems want use prepared statements positional parameters. choice, syntax has problems.

first, following line need change:

statement.executeupdate(query);

preparedstatement#executeupdate() not take parameters. check javadoc possible mistake may have made.

also, never assigned positional parameters. try following full code snippet:

preparedstatement statement; connection = createconnection.getdatabase(); statement = connection.preparestatement(query);  system.out.println("enter id..."); int id = integer.parseint(buffer.readline());  system.out.println("enter name..."); string name = buffer.readline();  statement.setstring(1, name); statement.setint(2, id);  statement.executeupdate();

Comments

Post a Comment

Popular posts from this blog

python - Operations inside variables -

this question has answer here: evaluating mathematical expression in string 12 answers i want make python script finds maximum possible output using 2 operations. problem says there syntax error @ 2nd last line, in b in there. how can fix it? x = 0 = int(input("1st number:")) c = int(input("2nd number:" )) e = int(input("3rd number:" )) in range(4): if == 0: b = "+" elif == 1: b = "-" elif == 2: b = "/" else: b = "*" j in range(4): if j == 0: d = "+" elif j == 1: d = "-" elif j == 2: d = "/" else: d = "*" k = b c d e print(k) if you're after variables e on single line, couldn...
Read more

Generic Map Parameter java -

i having lot of methods of type: public static list<eduusers> getdetails(class c, map<string, integer> params) { list<eduusers> details = null; session session = hibernateutil.getsessionfactory().opensession(); transaction tx = null; try { tx = session.begintransaction(); criteria cr = session.createcriteria(c); (map.entry<string, integer> entry : params.entryset()) { cr.add(restrictions.eq(entry.getkey(), entry.getvalue())); } details = cr.list(); tx.commit(); } catch (exception asd) { log.debug(asd.getmessage()); if (tx != null) { tx.commit(); } } { session.close(); } return details; } i trying have generic method them , have written far: public static <t> list<t> getdetails(class<t> c, class<t> b) { l...
Read more

arrays - What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it? -

what arrayindexoutofboundsexception mean , how rid of it? here code sample triggers exception: string[] name = {"tom", "dick", "harry"}; for(int = 0; i<=name.length; i++) { system.out.print(name[i] +'\n'); } your first port of call should documentation explains reasonably clearly: thrown indicate array has been accessed illegal index. index either negative or greater or equal size of array. so example: int[] array = new int[5]; int boom = array[10]; // throws exception as how avoid it... um, don't that. careful array indexes. one problem people run thinking arrays 1-indexed, e.g. int[] array = new int[5]; // ... populate array here ... (int index = 1; index <= array.length; index++) { system.out.println(array[index]); } that miss out first element (index 0) , throw exception when index 5. valid indexes here 0-4 inclusive. correct, idiomatic for statement here be: for (int index = 0; index <...
Read more