oo database programming in perl

... sections In hisbook Extreme Programming Explained Kent Beck defines the 12 practices as follows (quoted verbatim): The Planning Game Quickly determine the scope of the next release bycombining business ... Problem), the what (Extreme Programmingand Perl) and the how (Release Planning, Iteration Planning, AcceptanceTesting, Tracking, and Pair Programming) There is some code in Accep-Copyright c All ... youaren’t going to need, and Perl lets you put this principle into action 1 Programming Perl, 3rd Edition by Larry Wall et al, p xix. Trang 333.3 TestingAnother parallel between XP and Perl is testing

Ngày tải lên: 27/06/2014, 09:20

... Line 2 in Listing 9.6 calls an imaginary Windows API function named CreateInstance Line 2 passes an (imaginary) identifier to the CreateInstance function to indicate that it should create an instance ... array of four pointers to myBaseClass class Lines 29-32 initialize the pointers in thearray by creating alternating instances of myBaseClass and myDerivedClass Lines 39-42 delete theinstances of ... namedmyFunc in myDerivedClass, which overrides myFunc in myBaseClass Lines 16-24 define the myFunc functions to simply output a string indicating that they are being executed.Line 28 defines an array

Ngày tải lên: 13/08/2014, 08:20

... data from a database can make a pretty lame user interface Listing 11.2 shows a typical model for displaying and processing database data in HTML. NOTE Teach Yourself Database Programming with Visual ... code In HTML, each tag indicates how something should look However, in XML each tag indicates what something means.Line 3 is the start tag for the schema called "SalesSchema" Line 28 ... compiled into Windows EXEs and DLLs, without using COM interfaces As you discovered in Day 9, "Understanding COM," Windows EXEs and DLLs that don't support COM interfaces are invariably

Ngày tải lên: 13/08/2014, 08:21

... relational database schema to model a single level of inheritance. Data in the database would look something like the data shown in Figure 13.5 Figure 13.5 : Data in a relational database schema ... you need to get the total number of instances in the database, do not count them by instantiating every object inside a loop in the client code Instead, ask the database server to simply countthe ... the connection definition to a specific database The connection definition contains information about the type of database, as well as the pertinent location information for the database It then

Ngày tải lên: 13/08/2014, 08:21

... definition Generally, all interface definitions begin with IID Listing 16.2 references the IID_IDBInitialize interface identifier I will explain the OLE DB interfaces in detail as you examine ... API Programming Trang 2 9: unsigned char connStrOut[256];Line 11 in Listing 16.1 calls SQLAllocEnv to instruct the ODBC driver manager to allocate variables forTeach Yourself Database Programming ... obtain pointers to the OLE DB interfaces exposed by the provider and would call its member functions to perform operations on the database. ODBC programming and OLE programming are similar in

Ngày tải lên: 13/08/2014, 08:21

... CreateAccessor, GetBindings, and ReleaseAccessor These methods are defined as follows: HRESULT GetBindings(HACCESSOR hAccessor, DBACCESSORFLAGS *pdwFlags, ULONG *pNumBindings, DBBINDING *prgBinding); HRESULT ... GetBindings method retrieves the data bindings associated withan Accessor I explain these methods in moredetail later today and again tomorrow (Day 19) The IColumnsInfo Interface The IColumnsInfo ... types ofjoins that relational databases can create Table 18.9 Relational Database Types of Joins INNER JOIN Records are included in the resulting data set only when the field specified in the first

Ngày tải lên: 13/08/2014, 08:21

... row set information continues by examining the more advanced aspects of data access and navigation: column types supported, handling these various types, defining and using cursors, using bookmarks, ... accessing a BLOB column as a single in-memory object isn't very difficult You can also access a BLOB column by using the OLE streaming interfaces Day 20 covers these interfaces in more detail, including ... detail, including how to use them to access BLOB columns. Unicode String Processing Unicode strings are used to support international character sets Many strings defined by OLE DB are defined as Unicode

Ngày tải lên: 13/08/2014, 08:21

... the ISQLErrorInfo interface by using the GetCustomErrorObjectmethod of the IErrorRecord interface The ISQLErrorInfo interface defines a single method: GetSQLInfo Thismethod is defined as follows: ... Trang 1The ISQLErrorInfo InterfaceThe final error-related interface covered today is the ISQLErrorInfo interface This interface is used in the custom errorobject pointer of an error record ... begin by using the GetErrorInfo method to access the IErrorInfo interface If theinterface isn't available, use the CreateInstance method of the IClassFactory interface to create a newIErrorInfo

Ngày tải lên: 13/08/2014, 08:21

... thread to finish computing WaitForSingleObject (hThread1, //handle for thread INFINITE); //time out interval WaitForSingleObject(hThread2, INFINITE); // Print the computed Prime Numbers printf ... PrintNumbers.c ******************************************************/ #include <stdio.h> #include <stdlib.h> #include <windows.h> DWORD WINAPI PrintThreads (LPVOID); int ... *********************************************************/ #include <stdio.h> #include <stdlib.h> #include <math.h> #include <windows.h> #include <process.h> HANDLE g_hMutex = NULL; int *g_PrimeArr = NULL; int g_primeMax

Ngày tải lên: 12/09/2012, 14:40

... Further Information This book has a Web site (www.mkp.com/practical/csockets) that contains additional informa- tion including all the source code presented in the book, errata, and programming ... y checking: lines 23-36 in with the desired values, the extra bytes in the structure contain zero (This step is n e e d e d on some systems, but not all.) 9 Filling in the sockaddr_in: lines 44-46 ... client connection using c l o s e ( ) Creating the socket, sending, receiving, and closing are the same as in the client The differences in the server have to do with binding an a d d r e s s

Ngày tải lên: 05/11/2012, 14:45

... sockaddr_in6 { uint8_t sin6_len; sa_family_t sin6_family; in_port_t sin6_port; uint32_t sin6_flowinfo; struct in6_addr sin6_addr; }; Trang 19Working with Addressesstruct sockaddr_in6 the ... struct in_addr { in_addr_t s_addr; }; struct sockaddr_in { uint8_t sin_len; sa_family_t sin_family; in_port_t sin_port; struct in_addr sin_addr; char sin_pad[16];}; Trang 18struct sockaddr_in618 ... (Server)Usually specify INADDR_ANY htons() to convert port Trang 22Creating an Address: DNS• Use getaddrinfo() to look-up name in DNS • Returns a linked list of struct addrinfo values, representing addresses

Ngày tải lên: 05/09/2013, 09:57

... they must login or register Testing Computer Software by Cem Kaner et al is an excellent book about classical testing and quality assurance In Testing Extreme Programming, Lisa Crispin and Tip ... living under the constant fear of change We’re adding unit tests slowly, but it takes time, and it’s hard to justify writing tests when “everything is working fine” Too Little Pair Programming ... nagler@extremeperl.org 54 7.8 Meetings XP puts people over processes We don’t like wasting time in group meetings Formal meetings are limited to planning and what we call, stand-up meetings A stand-up...

Ngày tải lên: 05/08/2014, 10:21

... &Win32::BuildNumber(), "\n" if defined(&Win32::BuildNumber) and defined &Win32::BuildNumber(); print $TESTOUT "# MacPerl verison $MacPerl::Version\n" if defined $MacPerl::Version; printf $TESTOUT "# Current ... non-ASCII world’), defined(&Win32::BuildNumber) && defined(Win32::BuildNumber()) ? ’Win32::BuildNumber ’ Win32::BuildNumber() : (), defined($MacPerl::Version) ? "MacPerl version $MacPerl::Version" ... ownership, pair programming, and refactoring If you are developing a small application (a few thousand lines of Perl) , it’s easy to keep the code consistent, or to clean it up in an afternoon or two...

Ngày tải lên: 05/08/2014, 10:21

... locate EMA.pm in @INC [trimmed] # Looks like you failed tests of At this stage, you might be thinking, “Duh! Of course, it fails.” Testdriven design does involve lots of duhs in the beginning The baby ... this rather obscure way, that is, expecting a single list containing undef 9.10 Input Validation Perl is a dynamically typed language The routine plan contains a set of type assertions, and the ... agrees to adhere to it • Take refactoring into consideration when determining your coding style • Do the simplest thing that could possibly work when writing new code • Simplify your design so...

Ngày tải lên: 05/08/2014, 10:21

... common base class Finally, we fix a defect by exposing an API in both classes, and then we refactor the APIs into a single API in the base class 12.1 Refactoring The first step in continous design is ... happens, and it involves two activities: changing what the code does and improving its internal structure In XP, these two activities have names: implementing stories and refactoring Refactoring is the ... making code better without changing its external behavior The art of refactoring is a fundamental skill in programming It’s an important part of the programmer’s craft to initiate refactorings...

Ngày tải lên: 05/08/2014, 10:21

... handling in Refactoring Failure injection is an important technique to test error handling It is in a different class from deviance testing, which tests the API Instead, we use extra-API entry points ... Chapter 14 Refactoring In refactoring, there is a premium on knowing when to quit – Kent Beck Refactoring is an iterative design strategy Each refactoring improves an implementation in a small way ... 0); } The book Effective Perl Programming by Joseph Hall discusses the issues with wantarray and list contexts in detail Copyright c 2004 Robert Nagler All rights reserved nagler@extremeperl.org...

Ngày tải lên: 05/08/2014, 10:21

... rights reserved nagler@extremeperl.org 148 15.7 Pair Programming Programming courses rarely mention declarative programming Imperative programming is the norm It is all too easy to use imperative ... in pain, money, and time is much greater if you In the long term, too many fillings create structural problems and the tooth has to be replaced Refactoring is preventative maintenance, like tooth ... SMOP Representation is the essence of programming – Fred Brooks Implementing Extreme Perl is a simple matter of programming Practicing XP clarifies its values Perl s virtues come alive as you read...

Ngày tải lên: 05/08/2014, 10:21