【正文】 ific puting and mercial processing。 Non numerical data, including characters, text, graphics, images, voice and so on.Data elements (Data Element) is the basic unit of data. In different conditions, data elements can be called elements, nodes, the peak, recording. For example, students information retrieval system table information, a record high, 8 Queen39。s issue of a state tree, teaching programming issues such as a peak, known as a data element. Sometimes, a data from a number of data elements (Data Item), for example, the student information management system students each data element table is a student record. It includes students of the school, name, sex, nationality, date of birth, performance data items. These data items can be divided into two types : one called early such as student gender, origin, etc., these data were no longer divided in data processing, the smallest units。 Another called portfolio, the performance of students who, it can be divided into mathematics, physics, chemistry and other smaller items. Normally, in addressing the question of the practical application of each student is recorded as a basic unit for a visit and treatment.Data objects (Data Object) or data element type (Data Element Class) is the nature of the data elements with the same pool. In a specific issue, the data elements have the same nature (not necessarily equal value elements), belonging to the same data objects (data element type), the data element is an example of such data elements. For example, traffic information systems in the transportation network, is a culmination of all the data elements category, peak a and B each represent an urban middle is the data elements of the two types of examples of the value of their data elements a and B respectively. Data structure (Data Structure) refers to the mutual relationship that exists between one or more data elements together. In any case, between data elements will not be isolated in between them exist in one way or another, such as the relationship between the data element structure. According to the data elements of the relationship between different characteristics, usually have the following four basic categories of the structure : (1) assembly structures. In the assembly structure, the relationship between data elements is belonging to the same pool. Assembly elements relations is a very loose structure. (2) linear structures. The structure of the data elements exist between onetoone relationship. (3) tree structure. The structure of the data elements exist between hierarchical relationship. (4) graphics structure. The structure of the data elements of the relationship that existed between Duoduiduo, graphics structure also known as network structure.C++Builder programming experience1 Database programmingAnd the use of Delphi, Borland C++Builder BDE (Borland Database Engine) database interface, in particular its use BDE Administrator unified management database alias, the database operation has nothing to do with the location of the database documents, thus enabling database development easier operation. But in a database application procedures at the same time we have to release BDE, the database for some simple procedures may BDE than our own design procedures big, but as the use of BDE InstallShield, add database alias is likely allocation failure. Therefore, we can use the following methods : still in the design stage procedure using BDE alias management database for debugging, but in procedures substantially (as in the main Chuangti OnCreate event processing function) to Table ponents DatabaseName attributes, such as the use of similar phrases as follows : Table1DatabaseName = ExtractFilePath (ApplicationExeName)。 Or Table1DatabaseName = ExtractFilePath (ApplicationExeName+ DB)。Thus, no impact on the debugging phase, will be issued if the application procedures Table1 document on the use of databases or their current catalogue DB virus, database procedures can be normal operation. You can even be a database to catalogue the documents in the form of character string Register (installed in the installation process), then the procedure in the acquisition of substantially from the catalogue of payrolls, Fuzhi DatabaseName attribute to be. Anyway, you do not need to install relatively large BDE forced users.2 the Registry visitAs in the design process we often required 9x/NT Windows Registry information visit, such as retrieval of information procedures, preservation of information. Register write a subroutine to visit necessary. When the Register to visit, the library will be directly available without always some duplication operation. The following can be used to access cosmetic Licheng, the character string type Jianzhi, and the retrieval of failure to return default value Default.include int ReadIntFromReg(HKEY Root, AnsiString Key,AnsiString KeyName, int Default) {int KeyValue。TRegistry *Registry = new TRegistry()。RegistryRootKey = Root。RegistryOpenKey(Key, false)。try {KeyValue = RegistryReadInteger(KeyName)。}catch(...) {KeyValue = Default。}delete Registry。return KeyValue。}void SaveIntToReg(HKEY Root, AnsiString Key,AnsiString KeyName, int KeyValue) {TRegistry *Registry = new TRegistry()。RegistryRootKey = Root。RegistryOpenKey(Key, true)。RegistryWriteInteger(KeyName, KeyValue)。delete Registry。}char *ReadStringFromReg(HKEY Root, AnsiString Key,AnsiString KeyName, char *Default) {AnsiString KeyValue。TRegistry *Registry = new TRegistry()。RegistryRootKey = Root。RegistryOpenKey(Key, false)。try {KeyValue = RegistryReadString(KeyName)。}catch(...) {KeyValue = (AnsiString)Default。}delete Registry。return ()。}void SaveStringToReg(HKEY Root, AnsiString Key, AnsiString KeyName, char *KeyValue) {TRegistry *Registry = new TRegistry()。RegistryRootKey = Root。RegistryOpenKey(Key, tru