July 2003 - openSUSE Programming - openSUSE Mailing Lists

Recursive std::map?
by Steven T. Hatton 05 Jul '03

05 Jul '03

I took the advice of others on this list and attempted to read Stroustrup's 'Phone Book'. I believe I've learned a lot thus far, but I'm still in the dark on many issues. It has come to pass that after learning to write the cannonical 'hello world' in a given language, my next self-inflicted pedagogical exarcise is to write some kind of recursive data structure representation of a binary tree. The simple version of the data structure is something like: struct Node { char * data; Node * left_child; Node * right_child; }; I actually created code that used something very similar to this several winters past in C++. As it turns out, I was merely writing 'C' code with some C++ I/O features added. I'm now attempting something similar using STL and real OO in C++. A good example of the kind of structure I'm trying to create would be a simple file system, or XML document tree. The basic idea is this: Node[*Node][*Node][*Node][*Node][...][*Node] | | | | ... | | | | | V | | | V Node[*Node][*Node][...][*Node] | | V Node[*Node][*Node][*Node][*Node][...][*Node] | V Node[*Node][*Node][*Node][*Node][...][*Node] V Node[*Node][*Node][*Node][*Node][...][*Node] Node[*Node][*Node][*Node][*Node][...][*Node] Each node would have it's own representative data such as name, state(e.g., expanded || collapsed, date of creation), as well as a collection of children. For various reasons I attempted to accomplish this with a std::map rather than a std::vector, or similar. A vector may actually be more tractible, and appropreate for this task. In either case, I am at a loss for how to create such a recursive tree using the STL. Does anybody understand my objective? If so, do you know of an approach to solving this problem with an STL container? I haven't finished Stroustrup's book, so I may have an good example sitting right here on my desk. Steven

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STL Tutorial and Reference Guide: C++ Programming with the Standard Template Library , Second Edition
by Steven T. Hatton 05 Jul '03

05 Jul '03

Opinions? http://www.cs.rpi.edu/~musser/stl-book/index.html

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Curiosity on covariant return type (C++)
by Verdi March 04 Jul '03

04 Jul '03

Hi, just curious, when I tried this trick on function returning referenceg++ failed. Also, when I searched in Google, all examples use functions that return a pointer. class Base { virtual Base& getRef() const = 0; virtual Base* getPtr() const = 0; } class Derived : public Base{ virtual Derived& getRef() const; //This one does not work. virtual Derived* getPtr() const; } Perhaps someone knows the exact definition (standard/ISO) of this -- is reference allowed or only pointer allowed? TIA. -- -- Verdi March --

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Exception in thread (JDBC for adabas D first use)
by Prabu Subroto 04 Jul '03

04 Jul '03

Dear my friends... I am developing a database application with Star Office, Adabas D, SuSE 8.2, Java and JDBC. This is my first experience in using JDBC and Adabas D. Usually I use PHP and MySQL. So please help me, I need many advices. I copy the adabasd.jar into the same directory where my application code (on Java language located). It is compiled successfully but it is not able to build a connection between my Adabas D and my application over JDBC. The error message is : " #prabu>java -classpath adabasd.jar konek Exception in thread "main" java.lang.NoClassDefFoundError : konek " The name of my code is "konek.java" after compiled it is "konek.class". Here is my code : " import java.sql.*; public class konek { public static void main(String[] args) { System.out.println("Hallo Indonesia"); try { Class.forName("de.sag.jdbc.adabasd.aDriver"); } catch (ClassNotFoundException e){ System.out.println("JDBC driver for Adabas D not found"); }; try { java.sql.Connection con = java.sql.DriverManager.getConnection("jdbc:adabasd://susefujitsu/prabusoft", "control", "duisburg"); } catch (java.sql.SQLException e) { System.out.println("Error " + e.getErrorCode() + " " + e.getMessage()); } } } " I don't know why it can not find the class whereas I've put the class (konek.class) on the command line to execute my compiled program. Please help. Thank you very much in advance. --------------------------------- Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month!

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JDBC on Adabas D uffhh....
by Prabu Subroto 04 Jul '03

04 Jul '03

Dear my friends... Here my last try tonight: " sag@susefujitsu:~/arsip> export CLASSPATH=/usr/sag/aad/v1201/lib/adabasd.jar sag@susefujitsu:~/arsip> java -classpath $CLASSPATH:. konek Exception in thread "main" java.lang.NoClassDefFoundError: com/softwareag/common/instrumentation/logging/LoggerFactory at de.sag.jdbc.adabasd.ADriver.<clinit>(ADriver.java:423) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:140) at konek.main(konek.java:8) sag@susefujitsu:~/arsip> " Where is the mistake? Here is my code: " import java.sql.*; public class konek { public static void main(String[] args) { try { Class.forName("de.sag.jdbc.adabasd.ADriver"); } catch (ClassNotFoundException e){ System.out.println("JDBC driver for Adabas D not found"); e.printStackTrace(); } try { java.sql.Connection con = java.sql.DriverManager.getConnection("jdbc:adabasd://127.0.0.1/MYDB", "control", "adabas"); } catch (java.sql.SQLException e) { System.out.println("Error " + e.getErrorCode() + " " + e.getMessage()); e.printStackTrace(); } } } " __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com

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Re: AW: [suse-adabas] Understanding JDBC on Adabas D
by Prabu Subroto 03 Jul '03

03 Jul '03

Hallo Kolja... I still have the same problem now. Please help me. Here is my last try: " Exception in thread "main" java.lang.NoClassDefFoundError: com/softwareag/common/instrumentation/logging/LoggerFactory at de.sag.jdbc.adabasd.ADriver.<clinit>(ADriver.java:423) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:140) at konek.main(konek.java:8) sag@susefujitsu:~/arsip> " And here is my current code: " import java.sql.*; public class konek { public static void main(String[] args) { try { Class.forName("de.sag.jdbc.adabasd.ADriver"); } catch (ClassNotFoundException e){ System.out.println("JDBC driver for Adabas D not found"); e.printStackTrace(); } try { java.sql.Connection con = java.sql.DriverManager.getConnection("jdbc:adabasd://127.0.0.1/MYDB", "control", "adabas"); } catch (java.sql.SQLException e) { System.out.println("Error " + e.getErrorCode() + " " + e.getMessage()); e.printStackTrace(); } } } " What is my mistake? I am really confused. Please help me. --- Kolja Kleist <k.kleist(a)mediatransfer.de> wrote: > Hello, > you have to add the drivers location to your > CLASSPATH. > For example (unix): export > CLASSPATH=/usr/sag/aad/v1201/lib/adabasd.jar > or > java -classpath /usr/sag/aad/v1201/lib/adabasd.jar > myClass > > The line > Class.forName("de.sag.jdbc.adabasd.aDriver"); > will register the driver at the DriverManager. > > regards, > Kolja > > -----Ursprungliche Nachricht----- > Von: Prabu Subroto [mailto:prabusubroto@yahoo.com] > Gesendet: Montag, 30. Juni 2003 21:29 > An: SuSE ADABAS D Milis > Betreff: [suse-adabas] Understanding JDBC on Adabas > D > > > Dear my friends... > > I found this codes in the "internet guide" of Adabas > D > for doing the connection with JDBC to Adabas D : > === > import java.sql.*; > public class konek > { > public static void main(String[] args) > { > System.out.println("Hallo Indonesia"); > > try { > Class.forName("de.sag.jdbc.adabasd.aDriver"); > } catch (ClassNotFoundException e){ > system.out.println("JDBC driver for Adabas D not > found"); > }; > try { > java.sql.Connection con = > java.sql.DriverManager.getConnection("jdbc:adabasd://susefujitsu/prabusoft", > "control", "duisburg"); > } catch (java.sql.SQLException e) { > system.out.println("Error " + e.getErrorCode() + > " > " + e.getMessage()); > } > } > } > === > > I put my JDBC driver under > "/usr/sag/aad/v1201/lib/adabasd.jar". > > I don't understand this line : > " > Class.forName("de.sag.jdbc.adabasd.aDriver"); > " > Is it different on my my case? I mean, how should I > do > it on my case? Is there no difference? Where should > I > define the location of my JDBC Driver? and should I > load it? > > Sorry pal, I am absolutely new in JDBC. > > __________________________________ > Do you Yahoo!? > SBC Yahoo! DSL - Now only $29.95 per month! > http://sbc.yahoo.com > > -- > Um die Liste abzubestellen, schicken Sie eine Mail > an: > suse-adabas-unsubscribe(a)suse.com > Um eine Liste aller verf|gbaren Kommandos zu > bekommen, schicken > Sie eine Mail an: suse-adabas-help(a)suse.com > > > > -- > Um die Liste abzubestellen, schicken Sie eine Mail > an: > suse-adabas-unsubscribe(a)suse.com > Um eine Liste aller verf�gbaren Kommandos zu > bekommen, schicken > Sie eine Mail an: suse-adabas-help(a)suse.com > __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com

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Re: [suse-programming-e] Exception in thread "main" java.lang.NoClassDefFoundError: konek
by Prabu Subroto 03 Jul '03

03 Jul '03

Dear Bill.... But no change. Here was my try: " sag@susefujitsu:~/arsip> java .:/usr/sag/arsip/adabasd.jar konek Exception in thread "main" java.lang.NoClassDefFoundError: /:/usr/sag/arsip/adabasd/jar sag@susefujitsu:~/arsip> java /usr/sag/arsip/adabasd.jar:. konek Exception in thread "main" java.lang.NoClassDefFoundError: /usr/sag/arsip/adabasd/jar:/ sag@susefujitsu:~/arsip> java -classpath /usr/sag/arsip/adabasd.jar:. konek Exception in thread "main" java.lang.NoClassDefFoundError: com/softwareag/common/instrumentation/logging/LoggerFactory at de.sag.jdbc.adabasd.ADriver.<clinit>(ADriver.java:423) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:140) at konek.main(konek.java:8) sag@susefujitsu:~/arsip> java -classpath "/usr/sag/arsip/adabasd.jar:." konek Exception in thread "main" java.lang.NoClassDefFoundError: com/softwareag/common/instrumentation/logging/LoggerFactory at de.sag.jdbc.adabasd.ADriver.<clinit>(ADriver.java:423) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:140) at konek.main(konek.java:8) sag@susefujitsu:~/arsip> java -classpath "/usr/sag/aad/v1201/lib/adabasd.jar:." konek Exception in thread "main" java.lang.NoClassDefFoundError: com/softwareag/common/instrumentation/logging/LoggerFactory at de.sag.jdbc.adabasd.ADriver.<clinit>(ADriver.java:423) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:140) at konek.main(konek.java:8) sag@susefujitsu:~/arsip> " What is my mistake? --- bill s <opensource22(a)yahoo.com> wrote: > As Martijn told,� you just need the "." in the > classpath, in addition to the path to the JDBC > driver. > There is no magic here. All the jvm needs is the > path > to the class files to be able to find them. > �If you have driver jar (adabasd.jar) under > "/usr/sag/arsip" and your class file (konek.class) > is > also in "/usr/sag/arsip" then, > you would run your class as follows. > > sag@susefujitsu:~/arsip>java > .:/usr/sag/arsip/adabasd.jar konek > > > If your class file is in a different directory, then > you would have to have that path in the CLASSPATH > instead of "." > > > Best of luck. > --bill > > Prabu Subroto <prabu_subroto(a)yahoo.com> wrote: > Dear my friends... I can not connect to my Adabas D > over JDBC. This is the first try for me with Java, > JDBC and Adabas D. > > I got the error message : Exception in thread "main" > java.lang.NoClassDefFoundError: konek > > Please tell me why. Please.... > > Here I have done: > > sag@susefujitsu:~/arsip> export > DBROOT=/usr/sag/aad/v1201 > sag@susefujitsu:~/arsip> set > CLASSPATH="/usr/sag/aad/v1201/lib/adabasd.jar:/usr/sag/arsip/adabasd.jar" > sag@susefujitsu:~/arsip> whoami > sag > sag@susefujitsu:~/arsip> ls -la > /usr/sag/arsip/adabasd.jar > -rwxrwxrwx 1 sag users 108944 2002-06-27 > 18:09 /usr/sag/arsip/adabasd.jar > sag@susefujitsu:~/arsip> ls -la > /usr/sag/aad/v1201/lib/adabasd.jar > -r--r--r-- 1 sag users 108944 2002-06-27 > 18:09 /usr/sag/aad/v1201/lib/adabasd.jar > sag@susefujitsu:~/arsip> chmod +777 > /usr/sag/aad/v1201/lib/adabasd.jar > ag@susefujitsu:~/arsip> java -classpath > /usr/sag/aad/v1201/lib/adabasd.jar konek > Exception in thread "main" > java.lang.NoClassDefFoundError: konek > sag@susefujitsu:~/arsip> > > The error message is still the same. > > And here is my code: > import java.sql.*; > > public class konek > { > public static void main(String[] args) > { > System.out.println("Hallo Prabu"); > > try { > > Class.forName("de.sag.jdbc.adabasd.ADriver"); > } catch > (ClassNotFoundException e){ > > System.out.println("JDBC driver for Adabas D not > found"); > }; > try { > java.sql.Connection > con = > java.sql.DriverManager.getConnection("jdbc:adabasd://127.0.0.1/MYDB", > "control", "adabas"); > } catch (java.sql.SQLException > e) { > > System.out.println("Error " + e.getErrorCode() + " > " + e.getMessage()); > } > } > } > > Where is the mistake? Please help me. > > __________________________________ > Do you Yahoo!? > SBC Yahoo! DSL - Now only $29.95 per month! > http://sbc.yahoo.com > > -- > To unsubscribe, email: > suse-programming-e-unsubscribe(a)suse.com > For additional commands, email: > suse-programming-e-help(a)suse.com > Archives can be found at: > http://lists.suse.com/archive/suse-programming-e > > > > __________________________________ > Do you Yahoo!? > The New Yahoo! Search - Faster. Easier. Bingo. > http://search.yahoo.com __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com

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Exception in thread "main" java.lang.NoClassDefFoundError: konek
by Prabu Subroto 03 Jul '03

03 Jul '03

Dear my friends... I can not connect to my Adabas D over JDBC. This is the first try for me with Java, JDBC and Adabas D. I got the error message : Exception in thread "main" java.lang.NoClassDefFoundError: konek Please tell me why. Please.... Here I have done: sag@susefujitsu:~/arsip> export DBROOT=/usr/sag/aad/v1201 sag@susefujitsu:~/arsip> set CLASSPATH="/usr/sag/aad/v1201/lib/adabasd.jar:/usr/sag/arsip/adabasd.jar" sag@susefujitsu:~/arsip> whoami sag sag@susefujitsu:~/arsip> ls -la /usr/sag/arsip/adabasd.jar -rwxrwxrwx 1 sag users 108944 2002-06-27 18:09 /usr/sag/arsip/adabasd.jar sag@susefujitsu:~/arsip> ls -la /usr/sag/aad/v1201/lib/adabasd.jar -r--r--r-- 1 sag users 108944 2002-06-27 18:09 /usr/sag/aad/v1201/lib/adabasd.jar sag@susefujitsu:~/arsip> chmod +777 /usr/sag/aad/v1201/lib/adabasd.jar ag@susefujitsu:~/arsip> java -classpath /usr/sag/aad/v1201/lib/adabasd.jar konek Exception in thread "main" java.lang.NoClassDefFoundError: konek sag@susefujitsu:~/arsip> The error message is still the same. And here is my code: import java.sql.*; public class konek { public static void main(String[] args) { System.out.println("Hallo Prabu"); try { Class.forName("de.sag.jdbc.adabasd.ADriver"); } catch (ClassNotFoundException e){ System.out.println("JDBC driver for Adabas D not found"); }; try { java.sql.Connection con = java.sql.DriverManager.getConnection("jdbc:adabasd://127.0.0.1/MYDB", "control", "adabas"); } catch (java.sql.SQLException e) { System.out.println("Error " + e.getErrorCode() + " " + e.getMessage()); } } } Where is the mistake? Please help me. __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com

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JDBC + Adabas D + SuSE 8.2 (first time)
by Prabu Subroto 01 Jul '03

01 Jul '03

Dear my friends... I am developing a database application with Adabas D Database Server and Sun Java. The connection between the Adabas D and my application will be built by JDBC (adabasd.jar). My DBROOT is : /usr/sag/aad/v1201 The JDBC driver of Adabas D is under : /usr/sag/aad/v1201/lib Here is my code : === import java.sql.*; public class konek { public static void main(String[] args) { System.out.println("Hallo Indonesia"); try { Class.forName("de.sag.jdbc.adabasd.aDriver"); } catch (ClassNotFoundException e){ system.out.println("JDBC driver for Adabas D not found"); }; try { java.sql.Connection con = java.sql.DriverManager.getConnection("jdbc:adabasd://susefujitsu/iamsoft", "control", "duisburg"); } catch (java.sql.SQLException e) { system.out.println("Error " + e.getErrorCode() + " " + e.getMessage()); } } } === But If I compile it with this command : "javac konek.java" than I will get this error message : " konek.java:12:package system does not exist <----> system.out.println("JDBC driver for Adabas D not found"); konek.java:17:package system does not exist <----> system.out.println("Error" + e.getErrorCode() + " " + e.getMessage()); " Where is the problem ? --------------------------------- Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month!

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