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• Search for string within text column in MySQL

  - by user94154

  I have mysql table that has a column that stores xml as a string. I need to find all tuples where the xml column contains a given string of 6 characters. Nothing else matters--all I need to know is if this 6 character string is there or not. So it probably doesn't matter that the text is formatted as xml. Question: how can I search within mysql? ie SELECT * FROM items WHERE items.xml [contains the text '123456'] Is there a way I can use the LIKE operator to do this? Thanks

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• Returning a struct from a class method

  - by tree

  I have a header file that looks something like the following: class Model { private: struct coord { int x; int y; } xy; public: .... coord get() const { return xy; } }; And in yet another file (assume ModelObject exists): struct c { int x; int y; void operator = (c &rhs) { x = rhs.x; y = rhs.y; }; } xy; xy = ModelObject->get(); The compiler throws an error that says there is no known covnersion from coord to c. I believe it is because it doesn't know about coord type because it is declared inside of a class header. I can get around that by declaring the struct outside of the class, but I was wondering if it is possible to do the way I am, or is this generally considered bad practice

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• nested iterator errors

  - by Sean

  //arrayList.h #include<iostream> #include<sstream> #include<string> #include<algorithm> #include<iterator> using namespace std; template<class T> class arrayList{ public: // constructor, copy constructor and destructor arrayList(int initialCapacity = 10); arrayList(const arrayList<T>&); ~arrayList() { delete[] element; } // ADT methods bool empty() const { return listSize == 0; } int size() const { return listSize; } T& get(int theIndex) const; int indexOf(const T& theElement) const; void erase(int theIndex); void insert(int theIndex, const T& theElement); void output(ostream& out) const; // additional method int capacity() const { return arrayLength; } void reverse(); // new defined // iterators to start and end of list class iterator; class seamlessPointer; seamlessPointer begin() { return seamlessPointer(element); } seamlessPointer end() { return seamlessPointer(element + listSize); } // iterator for arrayList class iterator { public: // typedefs required by C++ for a bidirectional iterator typedef bidirectional_iterator_tag iterator_category; typedef T value_type; typedef ptrdiff_t difference_type; typedef T* pointer; typedef T& reference; // constructor iterator(T* thePosition = 0) { position = thePosition; } // dereferencing operators T& operator*() const { return *position; } T* operator->() const { return position; } // increment iterator& operator++() // preincrement { ++position; return *this; } iterator operator++(int) // postincrement { iterator old = *this; ++position; return old; } // decrement iterator& operator--() // predecrement { --position; return *this; } iterator operator--(int) // postdecrement { iterator old = *this; --position; return old; } // equality testing bool operator!=(const iterator right) const { return position != right.position; } bool operator==(const iterator right) const { return position == right.position; } protected: T* position; }; // end of iterator class class seamlessPointer: public arrayList<T>::iterator { // constructor seamlessPointer(T *thePosition) { iterator::position = thePosition; } //arithmetic operators seamlessPointer & operator+(int n) { arrayList<T>::iterator::position += n; return *this; } seamlessPointer & operator+=(int n) { arrayList<T>::iterator::position += n; return *this; } seamlessPointer & operator-(int n) { arrayList<T>::iterator::position -= n; return *this; } seamlessPointer & operator-=(int n) { arrayList<T>::iterator::position -= n; return *this; } T& operator[](int n) { return arrayList<T>::iterator::position[n]; } bool operator<(seamlessPointer &rhs) { if(int(arrayList<T>::iterator::position - rhs.position) < 0) return true; return false; } bool operator<=(seamlessPointer & rhs) { if (int(arrayList<T>::iterator::position - rhs.position) <= 0) return true; return false; } bool operator >(seamlessPointer & rhs) { if (int(arrayList<T>::iterator::position - rhs.position) > 0) return true; return false; } bool operator >=(seamlessPointer &rhs) { if (int(arrayList<T>::iterator::position - rhs.position) >= 0) return true; return false; } }; protected: // additional members of arrayList void checkIndex(int theIndex) const; // throw illegalIndex if theIndex invalid T* element; // 1D array to hold list elements int arrayLength; // capacity of the 1D array int listSize; // number of elements in list }; #endif //main.cpp #include<iostream> #include"arrayList.h" #include<fstream> #include<algorithm> #include<string> using namespace std; bool compare_nocase (string first, string second) { unsigned int i=0; while ( (i<first.length()) && (i<second.length()) ) { if (tolower(first[i])<tolower(second[i])) return true; else if (tolower(first[i])>tolower(second[i])) return false; ++i; } if (first.length()<second.length()) return true; else return false; } int main() { ifstream fin; ofstream fout; string str; arrayList<string> dict; fin.open("dictionary"); if (!fin.good()) { cout << "Unable to open file" << endl; return 1; } int k=0; while(getline(fin,str)) { dict.insert(k,str); // cout<<dict.get(k)<<endl; k++; } //sort the array sort(dict.begin, dict.end(),compare_nocase); fout.open("sortedDictionary"); if (!fout.good()) { cout << "Cannot create file" << endl; return 1; } dict.output(fout); fin.close(); return 0; } Two errors are: ..\src\test.cpp: In function 'int main()': ..\src\test.cpp:50:44: error: no matching function for call to 'sort(<unresolved overloaded function type>, arrayList<std::basic_string<char> >::seamlessPointer, bool (&)(std::string, std::string))' ..\src\/arrayList.h: In member function 'arrayList<T>::seamlessPointer arrayList<T>::end() [with T = std::basic_string<char>]': ..\src\test.cpp:50:28: instantiated from here ..\src\/arrayList.h:114:3: error: 'arrayList<T>::seamlessPointer::seamlessPointer(T*) [with T = std::basic_string<char>]' is private ..\src\/arrayList.h:49:44: error: within this context Why do I get these errors? Update I add public: in the seamlessPointer class and change begin to begin() Then I got the following errors: ..\hw3prob2.cpp:50:46: instantiated from here c:\wascana\mingw\bin\../lib/gcc/mingw32/4.5.0/include/c++/bits/stl_algo.h:5250:4: error: no match for 'operator-' in '__last - __first' ..\/arrayList.h:129:21: note: candidate is: arrayList<T>::seamlessPointer& arrayList<T>::seamlessPointer::operator-(int) [with T = std::basic_string<char>, arrayList<T>::seamlessPointer = arrayList<std::basic_string<char> >::seamlessPointer] c:\wascana\mingw\bin\../lib/gcc/mingw32/4.5.0/include/c++/bits/stl_algo.h:5252:4: instantiated from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = arrayList<std::basic_string<char> >::seamlessPointer, _Compare = bool (*)(std::basic_string<char>, std::basic_string<char>)]' ..\hw3prob2.cpp:50:46: instantiated from here c:\wascana\mingw\bin\../lib/gcc/mingw32/4.5.0/include/c++/bits/stl_algo.h:2190:7: error: no match for 'operator-' in '__last - __first' ..\/arrayList.h:129:21: note: candidate is: arrayList<T>::seamlessPointer& arrayList<T>::seamlessPointer::operator-(int) [with T = std::basic_string<char>, arrayList<T>::seamlessPointer = arrayList<std::basic_string<char> >::seamlessPointer] Then I add operator -() in the seamlessPointer class ptrdiff_t operator -(seamlessPointer &rhs) { return (arrayList<T>::iterator::position - rhs.position); } Then I compile successfully. But when I run it, I found memeory can not read error. I debug and step into and found the error happens in stl function template<typename _RandomAccessIterator, typename _Distance, typename _Tp, typename _Compare> void __adjust_heap(_RandomAccessIterator __first, _Distance __holeIndex, _Distance __len, _Tp __value, _Compare __comp) { const _Distance __topIndex = __holeIndex; _Distance __secondChild = __holeIndex; while (__secondChild < (__len - 1) / 2) { __secondChild = 2 * (__secondChild + 1); if (__comp(*(__first + __secondChild), *(__first + (__secondChild - 1)))) __secondChild--; *(__first + __holeIndex) = _GLIBCXX_MOVE(*(__first + __secondChild)); ////// stop here __holeIndex = __secondChild; } Of course, there must be something wrong with the customized operators of iterator. Does anyone know the possible reason? Thank you.

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• Jquery Cycle Plugin Question - turning off relative links to photos so it goes to a URL

  - by alpdog14

  I am using Jquery Cycle Plugin and it has a side panel that highlights as the photos change and currently when I click on the text the associated photo pulls up then I have to click on the photo to go to the URL but I would like the text itself to link to the URL. I have looked at the fn.cycle.defaults but not sure what to change and I tried a few things but nothing works. If anyone can help me figure this out it would be most helpful. Here are the fn.cycle.defaults: fx: 'fade', // one of: fade, shuffle, zoom, scrollLeft, etc timeout: 4000, // milliseconds between slide transitions (0 to disable auto advance) continuous: 0, // true to start next transition immediately after current one completes speed: 1000, // speed of the transition (any valid fx speed value) speedIn: null, // speed of the 'in' transition speedOut: null, // speed of the 'out' transition next: null, // id of element to use as click trigger for next slide prev: null, // id of element to use as click trigger for previous slide prevNextClick: null, // callback fn for prev/next clicks: function(isNext, zeroBasedSlideIndex, slideElement) pager: null, // id of element to use as pager container pagerClick: null, // callback fn for pager clicks: function(zeroBasedSlideIndex, slideElement) pagerEvent: null, // event which drives the pager navigation pagerAnchorBuilder: null, // callback fn for building anchor links before: null, // transition callback (scope set to element to be shown) after: null, // transition callback (scope set to element that was shown) end: null, // callback invoked when the slideshow terminates (use with autostop or nowrap options) easing: null, // easing method for both in and out transitions easeIn: null, // easing for "in" transition easeOut: null, // easing for "out" transition shuffle: null, // coords for shuffle animation, ex: { top:15, left: 200 } animIn: null, // properties that define how the slide animates in animOut: null, // properties that define how the slide animates out cssBefore: null, // properties that define the initial state of the slide before transitioning in cssAfter: null, // properties that defined the state of the slide after transitioning out fxFn: null, // function used to control the transition height: 'auto', // container height startingSlide: 0, // zero-based index of the first slide to be displayed sync: 1, // true if in/out transitions should occur simultaneously random: 0, // true for random, false for sequence (not applicable to shuffle fx) fit: 0, // force slides to fit container pause: true, // true to enable "pause on hover" autostop: 0, // true to end slideshow after X transitions (where X == slide count) autostopCount: 0, // number of transitions (optionally used with autostop to define X) delay: 0, // additional delay (in ms) for first transition (hint: can be negative) slideExpr: null, // expression for selecting slides (if something other than all children is required) cleartype: 0, // true if clearType corrections should be applied (for IE) nowrap: 0 // true to prevent slideshow from wrapping }; I have tried changing the pageClick and pagerEvent but nothing seems to be working. Please help!!!

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• Function inserted not all records

  - by user1799459

  I wrote the following code by data transfer from Access to Firebird def FirebirdDatetime(dt): return '\'%s.%s.%s\'' % (str(dt.day).rjust(2,'0'), str(dt.month).rjust(2,'0'), str(dt.year).rjust(4,'0')) def SelectFromAccessTable(tablename): return 'select * from [' + tablename+']' def InsertToFirebirdTable(tablename, row): values='' i=0 for elem in row: i+=1 #print type(elem) if type(elem) == int: temp = str(elem) elif (type(elem) == str) or (type(elem)==unicode): temp = '\'%s\'' % (elem,) elif type(elem) == datetime.datetime: temp =FirebirdDatetime(elem) elif type(elem) == decimal.Decimal: temp = str(elem) elif elem==None: temp='null' if (i<len(row)): values+=temp+', ' else: values+=temp return 'insert into '+tablename+' values ('+values+')' def AccessToFirebird(accesstablename, firebirdtablename, accesscursor, firebirdcursor): SelectSql=SelectFromAccessTable(accesstablename) for row in accesscursor.execute(SelectSql): InsertSql=InsertToFirebirdTable(firebirdtablename, row) InsertSql=InsertSql print InsertSql firebirdcursor.execute(InsertSql) In the main module there is an AccessToFirebird function call conAcc = pyodbc.connect('DRIVER={Microsoft Access Driver (*.mdb, *.accdb)};DBQ=D:\ThirdTask\Northwind.accdb') SqlAccess=conAcc.cursor(); conn.begin() cur=conn.cursor() sql.AccessToFirebird('Customers', 'CLIENTS', SqlAccess, cur) conn.commit() conn.begin() cur=conn.cursor() sql.AccessToFirebird('??????????', 'EMPLOYEES', SqlAccess, cur) sql.AccessToFirebird('????', 'ROLES', SqlAccess, cur) sql.AccessToFirebird('???? ???????????', 'EMPLOYEES_ROLES', SqlAccess, cur) sql.AccessToFirebird('????????', 'DELIVERY', SqlAccess, cur) sql.AccessToFirebird('??????????', 'SUPPLIERS', SqlAccess, cur) sql.AccessToFirebird('????????? ?????? ???????', 'TAX_STATUS_OF_ORDERS', SqlAccess, cur) sql.AccessToFirebird('????????? ???????? ? ??????', 'STATE_ORDER_DETAILS', SqlAccess, cur) sql.AccessToFirebird('????????? ???????', 'CONDITION_OF_ORDERS', SqlAccess, cur) sql.AccessToFirebird('??????', 'ORDERS', SqlAccess, cur) sql.AccessToFirebird('?????', 'BILLS', SqlAccess, cur) sql.AccessToFirebird('????????? ?????? ?? ????????????', 'STATUS_PURCHASE_ORDER', SqlAccess, cur) sql.AccessToFirebird('?????? ?? ????????????', 'ORDERS_FOR_ACQUISITION', SqlAccess, cur) sql.AccessToFirebird('???????? ? ?????? ?? ????????????', 'INFORMPURCHASEORDER', SqlAccess, cur) sql.AccessToFirebird('??????', 'PRODUCTS', SqlAccess, cur) conn.commit() conAcc.commit() conn.close() conAcc.close() But as a result, not all records have been inserted into the table Products (Table Goods - Northwind database), for example, does not work request insert into PRODUCTS values ('4', 1, 'NWTB-1', '?????????? ???', null, 13.5000, 18.0000, 10, 40, '10 ??????? ?? 20 ?????????', '10 ??????? ?? 20 ?????????', 10, '???????', '') In ibexpert to this request message issued can't format message 13:587 -- message file C:\Windows\firebird.msg not found. conversion error from string "10 ?????????±???? ???? 20 ???°???µ?‚????????". Worked only requests insert into PRODUCTS values ('1', 82, 'NWTC-82', '???????', null, 2.0000, 4.0000, 20, 100, null, null, null, '????', '') insert into PRODUCTS values ('9', 83, 'NWTCS-83', '???????????? ?????', null, 0.5000, 1.8000, 30, 200, null, null, null, '????? ? ???????', '') insert into PRODUCTS values ('1', 97, 'NWTC-82', '???????', null, 3.0000, 5.0000, 50, 200, null, null, null, '????', '') insert into PRODUCTS values ('6', 98, 'NWTSO-98', '??????? ???', null, 1.0000, 1.8900, 100, 200, null, null, null, '????', '') insert into PRODUCTS values ('6', 99, 'NWTSO-99', '??????? ??????', null, 1.0000, 1.9500, 100, 200, null, null, null, '????', '') other records were not inserted.

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• sorting two tables (full join)

  - by Ruslan

  i'm joining tables like: select * from tableA a full join tableB b on a.id = b.id But the output should be: row without null fields row with null fields in tableB row with null fields in tableA Like: a.id a.name b.id b.name 5 Peter 5 Jones 2 Steven 2 Pareker 6 Paul null null 4 Ivan null null null null 1 Smith null null 3 Parker

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• Trying to Understand PLSQL Function

  - by Rachel

  I am new to PLSQL and I have this huge plsql function which am trying to understand and am having hard time understanding the flow and so I would really appreciate if anyone can run me through the big pieces so that I can understand the flow. Guidance would be highly appreciated. FUNCTION monthly_analysis( REGION_ID_P VARCHAR2, COUNTRY_ID_P VARCHAR2 , SUB_REGION_ID_P VARCHAR2 , CUSTOMER_TYPE_ID_P VARCHAR2 , RECEIVED_FROM_DATE_P VARCHAR2 , RECEIVED_TO_DATE_P VARCHAR2, CUSTOMER_ID_P VARCHAR2 , PRIORITY_ID_P VARCHAR2, WORK_GROUP_ID_P VARCHAR2, CITY_ID_P VARCHAR2, USER_ID_P VARCHAR2 ) RETURN AP_ANALYSIS_REPORT_TAB_TYPE pipelined IS with_sql LONG; e_sql LONG; where_sql LONG; group_by_sql LONG; curent_date Date; v_row AP_ANALYSIS_REPORT_ROW_TYPE := AP_ANALYSIS_REPORT_ROW_TYPE( NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL ); TYPE rectyp IS REF CURSOR; -- define weak REF CURSOR type rrc_rectyp rectyp; TYPE recordvar IS RECORD( MONTHS VARCHAR2(100), ORDERBY_MONTHS VARCHAR2(100), REQ_RECEIVED NUMBER(9,2), REQ_STILL_OPEN NUMBER(9,2), REQ_AWAIT_ACCEPTANCE NUMBER(9,2), REQ_WITH_ATT NUMBER(9,2), REQ_CLOSED NUMBER(9,2), REQ_CANCELLED NUMBER(9,2) ); res_rec recordvar; BEGIN select sysdate +substr(to_char(systimestamp, 'tzr'),3,1)/24 into curent_date from dual; where_sql := ' AND 1=1 '; IF COUNTRY_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.country_id ='|| COUNTRY_ID_P; END IF; IF SUB_REGION_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.SUB_REGION_ID ='|| SUB_REGION_ID_P; END IF; IF CUSTOMER_TYPE_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.CUSTOMER_TYPE_ID ='|| CUSTOMER_TYPE_ID_P; END IF; IF RECEIVED_FROM_DATE_P IS NOT NULL THEN where_sql := where_sql||' AND convert_time(received_date, ''GMT'', ''GMT'') >= convert_time(trunc(to_date('''||RECEIVED_FROM_DATE_P||''',''dd/mm/yyyy HH24:MI:SS'')), ''Europe/Paris'', ''GMT'')'; END IF; IF RECEIVED_TO_DATE_P IS NOT NULL THEN where_sql := where_sql||' AND convert_time(received_date, ''GMT'', ''GMT'') <= convert_time(trunc(to_date('''||RECEIVED_TO_DATE_P||''',''dd/mm/yyyy HH24:MI:SS'')), ''Europe/Paris'', ''GMT'')'; END IF; IF CUSTOMER_ID_P IS NOT NULL THEN where_sql := where_sql||' AND x.CUSTOMER_ID in(select CUSTOMER_ID from lk_customer where upper(CUSTOMER_NAME) like upper('''||CUSTOMER_ID_P||'%''))'; END IF; IF PRIORITY_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.PRIORITY_ID ='|| PRIORITY_ID_P; END IF; IF WORK_GROUP_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.WORKGROUP_ID ='|| WORK_GROUP_ID_P; END IF; IF CITY_ID_P IS NOT NULL THEN where_sql := where_sql ||' AND x.CITY_ID = ' || CITY_ID_P; END IF; group_by_sql := ' group by to_char(convert_time(received_date, ''GMT'', ''Europe/Paris''),''mm/YYYY''),to_char(convert_time(received_date, ''GMT'', ''Europe/Paris''),''yyyy/mm'')'; with_sql := 'with b AS (select cep_work_item_no from ap_main where req_accept_date is null and ecep_ap_utils.f_business_days(received_date,'''||curent_date||''')>30), e AS (select cep_work_item_no from ap_main where status_id=1 and req_accept_date is not null and stage_ID != 10 and stage_Id !=4 and ecep_ap_utils.f_business_days(received_date,'''||curent_date||''')>30), --f AS (select cep_work_item_no from ap_main where received_date is not null), m AS (select cep_work_item_no from ap_main where received_date is not null and status_id=1), n AS (select cep_work_item_no from ap_main where status_id=2), o AS (select cep_work_item_no from ap_main where status_id=3)'; --e_sql := ' SELECT MONTHS, REQ_RECEIVED,REQ_STILL_OPEN, REQ_AWAIT_ACCEPTANCE, REQ_WITH_ATT from ('; --e_sql := with_sql; e_sql := with_sql||' select to_char(convert_time(received_date, ''GMT'', ''Europe/Paris''),''mm/YYYY'') MONTHS, to_char(convert_time(received_date, ''GMT'', ''Europe/Paris''),''yyyy/mm'') ORDERBY_MONTHS, count(x.cep_work_item_no) REQ_RECEIVED, count(m.cep_work_item_no) REQ_STILL_OPEN,count(b.cep_work_item_no) REQ_AWAIT_ACCEPTANCE,count(e.cep_work_item_no) REQ_WITH_ATT, count(n.cep_work_item_no) REQ_CLOSED, count(o.cep_work_item_no) REQ_CANCELLED from emea_main x,m,b,e,n,o where x.cep_work_item_no=m.cep_work_item_no(+) and x.cep_work_item_no = b.cep_work_item_no(+) and x.cep_work_item_no=e.cep_work_item_no(+) and x.cep_work_item_no=n.cep_work_item_no(+) and x.cep_work_item_no=o.cep_work_item_no(+) and x.received_date is not null'; e_sql := e_sql|| where_sql||group_by_sql; OPEN rrc_rectyp FOR e_sql; LOOP FETCH rrc_rectyp INTO res_rec; EXIT WHEN rrc_rectyp%NOTFOUND; v_row.MONTHS := res_rec.MONTHS ; v_row.ORDERBY_MONTHS := res_rec.ORDERBY_MONTHS ; v_row.REQ_RECEIVED := res_rec.REQ_RECEIVED; v_row.REQ_STILL_OPEN := res_rec.REQ_STILL_OPEN; v_row.REQ_AWAIT_ACCEPTANCE := res_rec.REQ_AWAIT_ACCEPTANCE; v_row.REQ_WITH_ATT := res_rec.REQ_WITH_ATT; v_row.REQ_CLOSED := res_rec.REQ_CLOSED; v_row.REQ_CANCELLED := res_rec.REQ_CANCELLED; pipe ROW(v_row); END LOOP; RETURN; END monthly_analysis; And would also appreciate if someone can let me know as to what are the important plsql concepts used here so that I can go ahead and understand them in a better way and some small explanation would go long way. As suggested by dcp, i am trying to use debugger, again I have not used it before and so pardon me, here is what am getting: DECLARE REGION_ID_P VARCHAR2(200); COUNTRY_ID_P VARCHAR2(200); SUB_REGION_ID_P VARCHAR2(200); CUSTOMER_TYPE_ID_P VARCHAR2(200); RECEIVED_FROM_DATE_P VARCHAR2(200); RECEIVED_TO_DATE_P VARCHAR2(200); CUSTOMER_ID_P VARCHAR2(200); PRIORITY_ID_P VARCHAR2(200); WORK_GROUP_ID_P VARCHAR2(200); CITY_ID_P VARCHAR2(200); USER_ID_P VARCHAR2(200); v_Return GECEPDEV.AP_ANALYSIS_REPORT_TAB_TYPE; BEGIN REGION_ID_P := NULL; COUNTRY_ID_P := NULL; SUB_REGION_ID_P := NULL; CUSTOMER_TYPE_ID_P := NULL; RECEIVED_FROM_DATE_P := NULL; RECEIVED_TO_DATE_P := NULL; CUSTOMER_ID_P := NULL; PRIORITY_ID_P := NULL; WORK_GROUP_ID_P := NULL; CITY_ID_P := NULL; USER_ID_P := NULL; v_Return := ECEP_AP_REPORTS.MONTHLY_ANALYSIS( REGION_ID_P => REGION_ID_P, COUNTRY_ID_P => COUNTRY_ID_P, SUB_REGION_ID_P => SUB_REGION_ID_P, CUSTOMER_TYPE_ID_P => CUSTOMER_TYPE_ID_P, RECEIVED_FROM_DATE_P => RECEIVED_FROM_DATE_P, RECEIVED_TO_DATE_P => RECEIVED_TO_DATE_P, CUSTOMER_ID_P => CUSTOMER_ID_P, PRIORITY_ID_P => PRIORITY_ID_P, WORK_GROUP_ID_P => WORK_GROUP_ID_P, CITY_ID_P => CITY_ID_P, USER_ID_P => USER_ID_P ); -- Modify the code to output the variable -- DBMS_OUTPUT.PUT_LINE('v_Return = ' || v_Return); END; Can anyone guide me through this query and its goal ?

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• Shell command slow when using pipe, fast with intermediate file

  - by plang

  Does anyone understand this huge difference in processing time, when using an intermediate file, or when using a pipe? I'm converting tiff to pdf using standard tools on a fresh debian squeeze server. A standard way of doing this is to convert to ps first. Without pipe: root@web5:~# time tiff2ps test.tif > test.ps real 0m0.860s user 0m0.744s sys 0m0.112s root@web5:~# time ps2pdf13 -sPAPERSIZE=a4 test.ps > test.pdf real 0m0.667s user 0m0.612s sys 0m0.060s With pipe: root@web5:~# time tiff2ps test.tif | ps2pdf13 -sPAPERSIZE=a4 - > test.pdf real 1m6.098s user 0m15.861s sys 0m50.9 During the last command, gs process is at 100% all the time. Update: Here is an strace output for the ps generation: root@web5:~# strace tiff2ps test.tif > test.ps execve("/usr/bin/tiff2ps", ["tiff2ps", "test.tif"], [/* 28 vars */]) = 0 brk(0) = 0x1395000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb5a1937000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=21735, ...}) = 0 mmap(NULL, 21735, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fb5a1931000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/usr/lib/libtiff.so.4", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\200\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=405128, ...}) = 0 mmap(NULL, 2501416, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fb5a14b9000 mprotect(0x7fb5a151a000, 2093056, PROT_NONE) = 0 mmap(0x7fb5a1719000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x60000) = 0x7fb5a1719000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/usr/lib/libjpeg.so.62", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\3408\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=145048, ...}) = 0 mmap(NULL, 2240080, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fb5a1296000 mprotect(0x7fb5a12b9000, 2093056, PROT_NONE) = 0 mmap(0x7fb5a14b8000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x22000) = 0x7fb5a14b8000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/usr/lib/libz.so.1", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260\"\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=93936, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb5a1930000 mmap(NULL, 2188976, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fb5a107f000 mprotect(0x7fb5a1096000, 2093056, PROT_NONE) = 0 mmap(0x7fb5a1295000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x7fb5a1295000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/libm.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360>\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=530736, ...}) = 0 mmap(NULL, 2625768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fb5a0dfd000 mprotect(0x7fb5a0e7d000, 2097152, PROT_NONE) = 0 mmap(0x7fb5a107d000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x80000) = 0x7fb5a107d000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\240\355\1\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1437064, ...}) = 0 mmap(NULL, 3545160, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fb5a0a9b000 mprotect(0x7fb5a0bf4000, 2093056, PROT_NONE) = 0 mmap(0x7fb5a0df3000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x158000) = 0x7fb5a0df3000 mmap(0x7fb5a0df8000, 18504, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fb5a0df8000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb5a192f000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb5a192e000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb5a192d000 arch_prctl(ARCH_SET_FS, 0x7fb5a192e700) = 0 mprotect(0x7fb5a0df3000, 16384, PROT_READ) = 0 mprotect(0x7fb5a107d000, 4096, PROT_READ) = 0 mprotect(0x7fb5a1939000, 4096, PROT_READ) = 0 munmap(0x7fb5a1931000, 21735) = 0 open("test.tif", O_RDONLY) = 3 brk(0) = 0x1395000 brk(0x13b6000) = 0x13b6000 read(3, "II*\0\10\0\0\0", 8) = 8 fstat(3, {st_mode=S_IFREG|0644, st_size=1825656, ...}) = 0 mmap(NULL, 1825656, PROT_READ, MAP_SHARED, 3, 0) = 0x7fb5a176f000 open("/proc/meminfo", O_RDONLY) = 4 fstat(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb5a1936000 read(4, "MemTotal: 2090844 kB\nMemF"..., 1024) = 1024 close(4) = 0 munmap(0x7fb5a1936000, 4096) = 0 write(2, "TIFFReadDirectory: ", 19TIFFReadDirectory: ) = 19 write(2, "Warning, ", 9Warning, ) = 9 write(2, "test.tif: wrong data type 7 for "..., 59test.tif: wrong data type 7 for "RichTIFFIPTC"; tag ignored) = 59 write(2, ".\n", 2. ) = 2 gettimeofday({1334836895, 374666}, NULL) = 0 fstat(1, {st_mode=S_IFREG|0664, st_size=0, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb5a1936000 open("/etc/localtime", O_RDONLY) = 4 fstat(4, {st_mode=S_IFREG|0644, st_size=1892, ...}) = 0 fstat(4, {st_mode=S_IFREG|0644, st_size=1892, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb5a1935000 read(4, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\4\0\0\0\4\0\0\0\0"..., 4096) = 1892 lseek(4, -1217, SEEK_CUR) = 675 read(4, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\6\0\0\0\6\0\0\0\0"..., 4096) = 1217 close(4) = 0 munmap(0x7fb5a1935000, 4096) = 0 write(1, "%!PS-Adobe-3.0 EPSF-3.0\n%%Creato"..., 4096) = 4096 write(1, "fffffffffffffffffffffffffffff\nff"..., 4096) = 4096 write(1, "ffffffffffffffffffff\nfffffffffff"..., 4096) = 4096 write(1, "fffffffffff\nffffffffffffffffffff"..., 4096) = 4096 write(1, "ff\nfffffffffffffffffffffffffffff"..., 4096) = 4096 write(1, "ffffffffffffffffffffffffffffffff"..., 4096) = 4096 write(1, "ffffffffffffffffffffffffffffffff"..., 4096) = 4096 write(1, "ffffffffffffffffffffffffffffffff"..., 4096) = 4096 write(1, "ffffffffffffffffffffffffffffffff"..., 4096) = 4096 write(1, "ffffffffffffffffffffffff\nfffffff"..., 4096) = 4096 Here is an strace output for the piped version: PS generation seems to be much slower when output is piped into ps2pdf13. root@web5:~# strace tiff2ps test.tif | ps2pdf13 -sPAPERSIZE=a4 - > test.pdf execve("/usr/bin/tiff2ps", ["tiff2ps", "test.tif"], [/* 28 vars */]) = 0 brk(0) = 0x1b97000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9208bb1000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=21735, ...}) = 0 mmap(NULL, 21735, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f9208bab000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/usr/lib/libtiff.so.4", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\200\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=405128, ...}) = 0 mmap(NULL, 2501416, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9208733000 mprotect(0x7f9208794000, 2093056, PROT_NONE) = 0 mmap(0x7f9208993000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x60000) = 0x7f9208993000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/usr/lib/libjpeg.so.62", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\3408\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=145048, ...}) = 0 mmap(NULL, 2240080, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9208510000 mprotect(0x7f9208533000, 2093056, PROT_NONE) = 0 mmap(0x7f9208732000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x22000) = 0x7f9208732000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/usr/lib/libz.so.1", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260\"\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=93936, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9208baa000 mmap(NULL, 2188976, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f92082f9000 mprotect(0x7f9208310000, 2093056, PROT_NONE) = 0 mmap(0x7f920850f000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x7f920850f000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/libm.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360>\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=530736, ...}) = 0 mmap(NULL, 2625768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9208077000 mprotect(0x7f92080f7000, 2097152, PROT_NONE) = 0 mmap(0x7f92082f7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x80000) = 0x7f92082f7000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\240\355\1\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1437064, ...}) = 0 mmap(NULL, 3545160, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9207d15000 mprotect(0x7f9207e6e000, 2093056, PROT_NONE) = 0 mmap(0x7f920806d000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x158000) = 0x7f920806d000 mmap(0x7f9208072000, 18504, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f9208072000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9208ba9000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9208ba8000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9208ba7000 arch_prctl(ARCH_SET_FS, 0x7f9208ba8700) = 0 mprotect(0x7f920806d000, 16384, PROT_READ) = 0 mprotect(0x7f92082f7000, 4096, PROT_READ) = 0 mprotect(0x7f9208bb3000, 4096, PROT_READ) = 0 munmap(0x7f9208bab000, 21735) = 0 open("test.tif", O_RDONLY) = 3 brk(0) = 0x1b97000 brk(0x1bb8000) = 0x1bb8000 read(3, "II*\0\10\0\0\0", 8) = 8 fstat(3, {st_mode=S_IFREG|0644, st_size=1825656, ...}) = 0 mmap(NULL, 1825656, PROT_READ, MAP_SHARED, 3, 0) = 0x7f92089e9000 open("/proc/meminfo", O_RDONLY) = 4 fstat(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9208bb0000 read(4, "MemTotal: 2090844 kB\nMemF"..., 1024) = 1024 close(4) = 0 munmap(0x7f9208bb0000, 4096) = 0 write(2, "TIFFReadDirectory: ", 19TIFFReadDirectory: ) = 19 write(2, "Warning, ", 9Warning, ) = 9 write(2, "test.tif: wrong data type 7 for "..., 59test.tif: wrong data type 7 for "RichTIFFIPTC"; tag ignored) = 59 write(2, ".\n", 2. ) = 2 gettimeofday({1334836513, 114140}, NULL) = 0 fstat(1, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9208bb0000 open("/etc/localtime", O_RDONLY) = 4 fstat(4, {st_mode=S_IFREG|0644, st_size=1892, ...}) = 0 fstat(4, {st_mode=S_IFREG|0644, st_size=1892, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9208baf000 read(4, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\4\0\0\0\4\0\0\0\0"..., 4096) = 1892 lseek(4, -1217, SEEK_CUR) = 675 read(4, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\6\0\0\0\6\0\0\0\0"..., 4096) = 1217 close(4) = 0 munmap(0x7f9208baf000, 4096) = 0 write(1, "%!PS-Adobe-3.0 EPSF-3.0\n%%Creato"..., 4096) = 4096 write(1, "fffffffffffffffffffffffffffff\nff"..., 4096) = 4096 write(1, "ffffffffffffffffffff\nfffffffffff"..., 4096) = 4096 write(1, "fffffffffff\nffffffffffffffffffff"..., 4096) = 4096 write(1, "ff\nfffffffffffffffffffffffffffff"..., 4096) = 4096 write(1, "ffffffffffffffffffffffffffffffff"..., 4096) = 4096 write(1, "ffffffffffffffffffffffffffffffff"..., 4096) = 4096 write(1, "ffffffffffffffffffffffffffffffff"..., 4096) = 4096 write(1, "ffffffffffffffffffffffffffffffff"..., 4096) = 4096 ...etc...

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• Sorting a Linked List [closed]

  - by Mohit Sehgal

  I want to sort a linked list. Here Node is class representing a node in a Linked List I have written a code to bubble sort a linked list. Program does not finishes execution. Kindly point out the mistakes. class Node { public: int data; public: Node *next; Node() { data=0;next=0; } Node(int d) { data=d; } void setData(int d) { data=d; } void print() { cout<<data<<endl; } bool operator==(Node n) { return this->data==n.data; } bool operator >(Node d) { if((this->data) > (d.data)) return true; return false; } }; class LList { public: int noOfNodes; Node *start;/*Header Node*/ LList() { start=new Node; noOfNodes=0;start=0; } void addAtFront(Node* n) { n->next=(start); start=n; noOfNodes++; } void addAtLast(Node* n) { Node *cur=(start); n->next=NULL; if(start==NULL) { start=n; noOfNodes++; return; } while(cur->next!=NULL) { cur=cur->next; } cur->next=n; noOfNodes++; } void addAtPos(Node *n,int pos) { if(pos==1) { addAtFront(n);return; } Node *cur=(start); Node *prev=NULL; int curPos=0; n->next=NULL; while(cur!=NULL) { curPos++; if(pos==curPos+1) { prev=cur; } if(pos==curPos) { n->next=cur; prev->next=n; break; } cur=cur->next; } noOfNodes++; } void removeFirst() { Node *del=start; start=start->next; delete del; noOfNodes--; return; } void removeLast() { Node *cur=start,*prev=NULL; while(cur->next!=NULL) { prev=cur; cur=cur->next; } prev->next=NULL; Node *del=cur->next; delete del; noOfNodes--; return; } void removeNodeAt(int pos) { if(pos<1) return; if(pos==1) { removeFirst();return;} int curPos=1; Node* cur=start->next; Node* prev=start; Node* del=NULL; while(curPos<pos&&cur!=NULL) { curPos++; if(curPos==pos) { del=cur; prev->next=cur->next; cur->next=NULL; delete del; noOfNodes--; break; } prev=prev->next; cur=cur->next; } } void removeNode(Node *d) { Node *cur=start; if(*d==*cur) { removeFirst();return; } cur=start->next; Node *prev=start,*del=NULL; while(cur!=NULL) { if(*cur==*d) { del=cur; prev->next=cur->next; delete del; noOfNodes--; break; } prev=prev->next; cur=cur->next; } } int getPosition(Node data) { int pos=0; Node *cur=(start); while(cur!=NULL) { pos++; if(*cur==data) { return pos; } cur=cur->next; } return -1;//not found } Node getNode(int pos) { if(pos<1) return -1;// not a valid position else if(pos>noOfNodes) return -1; // not a valid position Node *cur=(start); int curPos=0; while(cur!=NULL) { if(++curPos==pos) return *cur; cur=cur->next; } } void reverseList()//reverse the list { Node* cur=start->next; Node* d=NULL; Node* prev=start; while(cur!=NULL) { d=cur->next; cur->next=start; start=cur; prev->next=d; cur=d; } } void sortBubble() { Node *i=start,*j=start,*prev=NULL,*temp=NULL,*after=NULL; int count=noOfNodes-1;int icount=0; while(i->next!=NULL) { j=start; after=j->next; icount=0; while(++icount!=count) { if((*j)>(*after)) { temp=after->next; after->next=j; prev->next=j->next; j->next=temp; prev=after; after=j->next; } else{ prev=j; j=after; after=after->next; } } i=i->next; count--; } } void traverse() { Node *cur=(start); int c=0; while(cur!=NULL) { // cout<<"start"<<start; c++; cur->print(); cur=cur->next; } noOfNodes=c; } ~LList() { delete start; } }; int main() { int n; cin>>n; int d; LList list; Node *node; Node *temp=new Node(2123); for(int i=0;i<n;i++) { cin>>d; node=new Node(d); list.addAtLast(node); } list.addAtPos(temp,1); cout<<"traverse\n"; list.traverse(); temp=new Node(12); list.removeNode(temp); cout<<"12 removed"; list.traverse(); list.reverseList(); cout<<"\nreversed\n"; list.traverse(); cout<<"bubble sort\n"; list.sortBubble(); list.traverse(); getch(); delete node; return 0; }

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• Why does java.util.ArrayList allow to add null?

  - by Alfredo O

  I wonder why java.util.ArrayList allows to add null. Is there any case where I would want to add null to an ArrayList? I am asking this question because in a project we had a bug where some code was adding nulls to the List and it was hard to spot where the bug was. Obviously a NullPointerException was thrown but not until another code tried to access the element. The problem was how to locate the code that added the null object. It would have been easier if the ArrayList throwed an exception in the code where the elements was being added.

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• LINQ .Cast() extension method fails but (type)object works.

  - by Ben Robinson

  To convert between some LINQ to SQL objects and DTOs we have created explicit cast operators on the DTOs. That way we can do the following: DTOType MyDTO = (LinqToSQLType)MyLinq2SQLObj; This works well. However when you try to cast using the LINQ .Cast() extension method it trows an invalid cast exception saying cannot cast type Linq2SQLType to type DTOType. i.e. the below does not work List<DTO.Name> Names = dbContact.tNames.Cast<DTO.Name>() .ToList(); But the below works fine: DAL.tName MyDalName = new DAL.tName(); DTO.Name MyDTOName = (DTO.Name)MyDalName; and the below also works fine List<DTO.Name> Names = dbContact.tNames.Select(name => (DTO.Name)name) .ToList(); Why does the .Cast() extension method throw an invalid cast exception? I have used the .Cast() extension method in this way many times in the past and when you are casting something like a base type to a derived type it works fine, but falls over when the object has an explicit cast operator.

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• overloading "<<" with a struct (no class) cout style

  - by monkeyking

  I have a struct that I'd like to output using either 'std::cout' or some other output stream. Is this possible without using classes? Thanks #include <iostream> #include <fstream> template <typename T> struct point{ T x; T y; }; template <typename T> std::ostream& dump(std::ostream &o,point<T> p) const{ o<<"x: " << p.x <<"\ty: " << p.y <<std::endl; } template<typename T> std::ostream& operator << (std::ostream &o,const point<T> &a){ return dump(o,a); } int main(){ point<double> p; p.x=0.1; p.y=0.3; dump(std::cout,p); std::cout << p ;//how? return 0; } I tried different syntax' but I cant seem to make it work.

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• Why is T() = T() allowed?

  - by Rimo

  I believe the expression T() creates an rvalue (by the Standard). However, the following code compiles (at least on gcc4.0): class T {}; int main() { T() = T(); } I know technically this is possible because member functions can be invoked on temporaries and the above is just invoking the operator= on the rvalue temporary created from the first T(). But conceptually this is like assigning a new value to an rvalue. Is there a good reason why this is allowed? Edit: The reason I find this odd is it's strictly forbidden on built-in types yet allowed on user-defined types. For example, int(2) = int(3) won't compile because that is an "invalid lvalue in assignment". So I guess the real question is, was this somewhat inconsistent behavior built into the language for a reason? Or is it there for some historical reason? (E.g it would be conceptually more sound to allow only const member functions to be invoked on rvalue expressions, but that cannot be done because that might break some existing code.)

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• Comparing objects and inheritance

  - by ereOn

  Hi, In my program I have the following class hierarchy: class Base // Base is an abstract class { }; class A : public Base { }; class B : public Base { }; I would like to do the following: foo(const Base& one, const Base& two) { if (one == two) { // Do something } else { // Do something else } } I have issues regarding the operator==() here. Of course comparing an instance A and an instance of B makes no sense but comparing two instances of Base should be possible. (You can't compare a Dog and a Cat however you can compare two Animals) I would like the following results: A == B = false A == A = true or false, depending on the effective value of the two instances B == B = true or false, depending on the effective value of the two instances My question is: is this a good design/idea ? Is this even possible ? What functions should I write/overload ? My apologies if the question is obviously stupid or easy, I have some serious fever right now and my thinking abilities are somewhat limited :/ Thank you.

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• Correct way to initialize dynamic Array in C++

  - by mef

  Hey guys, I'm currently working on a C++ project, where dynamic arrays often appear. I was wondering, what could be the correct way to initialize a dynamic array using the new-operator? A colleague of mine told me that it's a no-no to use new within the constructor, since a constructor is a construct that shouldn't be prone to errors or shouldn't fail at all, respectively. Now let's consider the following example: We have two classes, a more or less complex class State and a class StateContainer, which should be self-explained. class State { private: unsigned smth; public: State(); State( unsigned s ); }; class StateContainer { private: unsigned long nStates; State *states; public: StateContainer(); StateContainer( unsigned long n ); virtual ~StateContainer(); }; StateContainer::StateContainer() { nStates = SOME_DEFINE_N_STATES; states = new State[nStates]; if ( !states ) { // Error handling } } StateContainer::StateContainer( unsigned long n ) { nStates = n; try { states = new State[nStates] } catch ( std::bad_alloc &e ) { // Error handling } } StateContainer::~StateContainer() { if ( states ) { delete[] states; states = 0; } } Now actually, I have two questions: 1.) Is it ok, to call new within a constructor, or is it better to create an extra init()-Method for the State-Array and why? 2.) Whats the best way to check if new succeeded: if (!ptr) std::cerr << "new failed." or try { /*new*/ } catch (std::bad_alloc) { /*handling*/ } 3.) Ok its three questions ;o) Under the hood, new does some sort of ptr = (Struct *)malloc(N*sizeof(Struct)); And then call the constructor, right?

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• [javascript] Can I overload an object with a function?

  - by user257493

  Lets say I have an object of functions/values. I'm interested in overloading based on calling behavior. For example, this block of code below demonstrates what I wish to do. var main_thing = { initalized: false, something: "Hallo, welt!", something_else: [123,456,789], load: { sub1 : function() { //Some stuff }, sub2 : function() { //Some stuff }, all : function() { this.load.sub1(); this.load.sub2(); } } init: function () { this.initalized=true; this.something="Hello, world!"; this.something_else = [0,0,0]; this.load(); //I want this to call this.load.all() instead. } } The issue to me is that main_thing.load is assigned to an object, and to call main_thing.load.all() would call the function inside of the object (the () operator). What can I do to set up my code so I could use main_thing.load as an access the object, and main_thing.load() to execute some code? Or at least, similar behavior. Basically, this would be similar to a default constructor in other languages where you don't need to call main_thing.constructor(). If this isn't possible, please explain with a bit of detail.

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• TestContext is null

  - by Budda

  Pretty simple test: [TestClass] public class MyTestClass { private TestContext _testContext; protected TestContext TestContext { get { return _testContext; } set { _testContext = value; } } [TestMethod] [HostType("ASP.NET")] [UrlToTest("http://localhost/MyPage.aspx")] public void TestMyPage() { Assert.IsNotNull(TestContext); } } Fails... Now I am using VS2008 Development edition. Is there any possibility to fix this? Or I need to have a Test (or Team Suite) edition? Thanks. P.S. Access to TestContext object is required to have access to it's RequestedPage property

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• How to fix Index out of range exception on idatareader

  - by Phil

  Good morning stack overflow, I have been forced into using the idatareader as opposed to the sqldatareader which has .hasrows available. In my code I am attempting to handle nulls like this: reader = GetContent(pageid) While reader.Read If reader("content") IsNot DBNull.Value Then content = Replace(reader("content"), Chr(38) + Chr(97) + Chr(109) + Chr(112) + Chr(59) + Chr(98) + Chr(104) + Chr(99) + Chr(112) + Chr(61) + Chr(49), "") If reader("id") IsNot DBNull.Value Then contentid = reader("id") End If Else contentid = -1 content = String.Empty End If End While Outputcontent.Text = content I am getting an 'Index Out of Range Exception' here: If reader("content") IsNot DBNull.Value Then The database does 100% contain 'content'

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• Zend_Json::decode returning null

  - by davykiash

  Am trying to validate my form using an AJAX call $("#button").click(function() { $.ajax({ type: "POST", url: "<?php echo $this->baseUrl() ?>/expensetypes/async", data: 'fs=' + JSON.stringify($('#myform').serialize(true)), contentType: "application/json; charset=utf-8", dataType: "json" }); }); On my controller my code is as follows //Map the form from the client-side call $myFormData = Zend_Json::decode($this->getRequest()->getParam("fs") ,Zend_Json::TYPE_ARRAY); $form = new Form_Expensetypes(); $form->isValid($myFormData); My problem is that I cannot validate since Zend_Form::isValid expects an array Am not quite sure wether the problem is at my serialisation at the client end or Zend_Json::decode function does not function with this kind of JSON parsing.

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• Application.ActiveInspector() is Null on Outlook Ribbon Load

  - by Nazgul

  Is it possible to access the ActiveInspector at the time of ribbon load. Application.ActiveInspector() returns proper value when I use custom form but does not for default contact form. I need the ActiveInspector to customize ribbon button depending on a property value in ActiveInspector().CurrentItem.

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• Silverlight4 disable textbox required validation when form loads with initial value (null)

  - by Jay

  I am trying to implement validation using IDataErrorInfo or INotifyDataErrorInfo but either way I am struggling to make it work only once user start entering data or clicking save button. Since I am using MVVM, I am setting my view's datacontext to ViewModel and my ViewModel is implementing IDataErrorInfo / INotifyDataErrorInfo. I need to make sure validation happens but not when form loads up. Anyone has got any suggestion how I can implement? Thanks

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• JSON/PrototypeJS - why does this only work SOMETIMES?

  - by koko

  This is driving me nuts! I'm getting some JSON from my server: {"id262":{"done":null,"status":null,"verfall":null,"id":262,"bid":20044,"art":"owner","uid":"demo02","aktion":null,"termin_datum":null,"docid":null,"gruppenid":null,"news":"newsstring","datum":"11.06.2010","header":"headerstring","for_uid":"demo01"}, "id263":{"done":null,"status":"pending","verfall":null,"bid":20044,"id":263,"uid":"demo02","art":"foo","aktion":"dosomething","termin_datum":"11.06.2010","docid":null,"gruppenid":null,"datum":"11.06.2010","news":"newsstring","for_uid":"demo01","header":"headerstring"}, "id261":{"done":null,"status":null,"verfall":null,"id":261,"bid":20044,"art":"termin","uid":"demo02","aktion":null,"termin_datum":"25.06.2010","docid":null,"gruppenid":null,"news":"newsstring","datum":"11.06.2010","header":"headerstring","for_uid":null}} This is how my JS looks like: var user = 'demo02'; new Ajax.Request('myscript.pl?someparameter=value', { method:'get', onSuccess: function(transport){ var db_json = transport.responseText.evalJSON(), propCount = 0, someArray1 = [], someArray2 = [], otherArray = []; //JSON DEBUG console.log('validated string:'); console.log(transport.responseText.evalJSON(true)); for(var prop in db_json) { propCount++; if ( (db_json[prop].art == 'foo') && (db_json[prop].for_uid == user) ) { someArray1.push(db_json[prop]); } else if( (db_json[prop].art == 'foo') && (db_json[prop].uid == user) ) { someArray2.push(db_json[prop]); } else if( db_json[prop].art == 'log' ) { otherArray.push(db_json[prop]); } } if(someArray1.length>0) { someArray1.map(function(el){ $('someArray1target').innerHTML += el.done; //do more stuff }); } if(someArray2.length>0) { someArray2.map(function(el){ $('someArray2target').innerHTML += el.done; //do more stuff }); } }); Sometimes, it works perfectly. Sometimes, i get my JSON String (it appears in Firebug's "answer"-tab), but it won't log the JSON in console-log(). I'm not getting any errors and javascript is still working. Next time after reloading, it might work, but it might not. I cannot remotely imagine why this only happens sometimes!

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• C++ JSON parser

  - by pollux

  Dear reader, I'm working on a twitter client which uses the twitter streaming json api. Twitter advices JSON as XML version is deprecated. I'm looking for a good JSON parser which can parse the json data below. I'm receiving this JSON which I want to be able to read/parse using a JSON parser. { "in_reply_to_status_id": null, "text": "Home-plate umpire Crawford gets stung http://tinyurl.com/27ujc86", "favorited": false, "coordinates": null, "in_reply_to_user_id": null, "source": "<a href=\"http://apiwiki.twitter.com/\" rel=\"nofollow\">API</a>", "geo": null, "created_at": "Fri Jun 18 15:12:06 +0000 2010", "place": null, "user": { "profile_text_color": "333333", "screen_name": "HostingViral", "time_zone": "Pacific Time (US & Canada)", "url": "http://bit.ly/1Way7P", "profile_link_color": "228235", "profile_background_image_url": "http://s.twimg.com/a/1276654401/images/themes/theme14/bg.gif", "description": "Full time Internet Marketer - Helping other reach their Goals\r\nhttp://wavemarker.com", "statuses_count": 1944, "profile_sidebar_fill_color": "c7b7c7", "profile_background_tile": true, "contributors_enabled": false, "lang": "en", "notifications": null, "created_at": "Wed Dec 30 07:50:52 +0000 2009", "profile_sidebar_border_color": "120412", "following": null, "geo_enabled": false, "followers_count": 2485, "protected": false, "friends_count": 2495, "location": "Working at Home", "name": "Johnathan Thomas", "verified": false, "profile_background_color": "131516", "profile_image_url": "http://a1.twimg.com/profile_images/600114776/nessykalvo421_normal.jpg", "id": 100439873, "utc_offset": -28800, "favourites_count": 0 }, "in_reply_to_screen_name": null, "id": 16477056501, "contributors": null, "truncated": false } *This is the raw string (above it beautified) * {"in_reply_to_status_id":null,"text":"Home-plate umpire Crawford gets stung http://tinyurl.com/27ujc86","favorited":false,"coordinates":null,"in_reply_to_user_id":null,"source":"<a href=\"http://apiwiki.twitter.com/\" rel=\"nofollow\">API</a>","geo":null,"created_at":"Fri Jun 18 15:12:06 +0000 2010","place":null,"user":{"profile_text_color":"333333","screen_name":"HostingViral","time_zone":"Pacific Time (US & Canada)","url":"http://bit.ly/1Way7P","profile_link_color":"228235","profile_background_image_url":"http://s.twimg.com/a/1276654401/images/themes/theme14/bg.gif","description":"Full time Internet Marketer - Helping other reach their Goals\r\nhttp://wavemarker.com","statuses_count":1944,"profile_sidebar_fill_color":"c7b7c7","profile_background_tile":true,"contributors_enabled":false,"lang":"en","notifications":null,"created_at":"Wed Dec 30 07:50:52 +0000 2009","profile_sidebar_border_color":"120412","following":null,"geo_enabled":false,"followers_count":2485,"protected":false,"friends_count":2495,"location":"Working at Home","name":"Johnathan Thomas","verified":false,"profile_background_color":"131516","profile_image_url":"http://a1.twimg.com/profile_images/600114776/nessykalvo421_normal.jpg","id":100439873,"utc_offset":-28800,"favourites_count":0},"in_reply_to_screen_name":null,"id":16477056501,"contributors":null,"truncated":false} I've tried multiple JSON parsers from json.org though I've tried 4 now and can't find one which can parse above json. Kind regards, Pollux

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• null values from listbox, are not evaluated in the model binding of ASP.NET-MVC

  - by Jorge

  The model validation doesn't evaluates the attributes linked to listbox values if you don't select at least one of them. This way is not possible to do a model evaluation using DataAnnotations in order to inform required values. The controller: using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; using TestValidation.Models; namespace TestValidation.Controllers { [HandleError] public class HomeController : Controller { private SelectList list = new SelectList(new List<string>() { "Sao Paulo", "Toronto", "New York", "Vancouver" }); public ActionResult Index() { ViewData["ModelState"] = "NOT EVAL"; ViewData["ItemsList"] = list; return View(); } [AcceptVerbs(HttpVerbs.Post)] public ActionResult Index(MyEntity entity) { if (ModelState.IsValid) { ViewData["ModelState"] = "VALID"; } else { ViewData["ModelState"] = "NOT VALID!!!"; } ViewData["ItemsList"] = list; return View(); } public ActionResult About() { return View(); } } } The View: <%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<TestValidation.Models.MyEntity>" %> <asp:Content ID="indexTitle" ContentPlaceHolderID="TitleContent" runat="server"> Home Page </asp:Content> <asp:Content ID="indexContent" ContentPlaceHolderID="MainContent" runat="server"> <h2> Validation Test</h2> <p> <% using (Html.BeginForm()) {%> <fieldset> <p> ModelState: <%= Html.Encode((string)ViewData["ModelState"])%> </p> <p> <label for="Name"> Name:</label> <%= Html.TextBoxFor(m => m.Name)%> <%= Html.ValidationMessageFor(m => m.Name)%> </p> <p> <label for="ItemFromList"> Items (list):</label> <%= Html.ListBoxFor(m => m.ItemFromList, ViewData["ItemsList"] as SelectList)%> <%= Html.ValidationMessageFor(m => m.ItemFromList)%> </p> <p> <label for="ItemFromCombo"> Items (combo):</label> <%= Html.DropDownListFor(m => m.ItemFromCombo, ViewData["ItemsList"] as SelectList)%> <%= Html.ValidationMessageFor(m => m.ItemFromCombo)%> </p> <p> <input type="submit" value="Submit" /> </p> </fieldset> <% } %> </asp:Content> The Model: using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.ComponentModel.DataAnnotations; namespace TestValidation.Models { public class MyEntity_Validate : ValidationAttribute { public MyEntity_Validate() { this.ErrorMessage = "Validated!. Is <> Toronto"; } public override bool IsValid(object value) { return ((string)value == "Toronto"); } } public class MyEntity { [Required] public string Name { get; set; } [MyEntity_Validate] public string ItemFromList { get; set; } [MyEntity_Validate] public string ItemFromCombo { get; set; } } } Any help would be very much appreciated. Thank you.

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• [[UIDevice currentDevice] orientation] always null

  - by Toby Wilson

  As per the title. Calling [[UIDevice currentDevice] BeginGeneratingDeviceOrientationNotifications] has no effect. DidRotateToInterfaceOrientation etc events are working fine, but I need to be able to poll the device orientation arbitrarily. How can I fix/do this? The long story: I have a tab application with a navigation controller on each tab. The root view of tab number one is a graph that goes full screen when the orientation changes to landscape; however this needs to be checked whenever the view appears as the orientation change could have occurred elsewhere, so I was hoping to poll the orientation state whenever this view appears.

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