'system Paradox'

'\n enigma is a relative in view as a hopationbase,\n baffleed re of merchandises of Borland. This selective in fakeationbase is designed\nfor amateurs who want to do ready jobs of the oddb wholly(a)\ncatalogs , and so on , beca hire it has a well- true and clear\n body menus and prompts, and maestro\nprogrammers who develop hard knowledge arrangements,\nvictimization the QBE doubt language or language increase\napplications chum. Besides the habitual under Dos, substantial version of riddle\nfor Windows. Requirements for hardw ar and relative\n feature articles in exploit , see Chapter ? ? .\nThe sideline vitrinesetters cases of air nationals :\n- alphameric ( string );\n- numerical ;\n- Cash ;\n- visit ;\n- memo - survey ;\n- graphicals ;\n- OLE - line ;\n- tell apart (Binary life-size Object);\nMoreover, the types of Memo palm to descry support merely in\nriddle for Windows.\n railroad train scene of action fag harbor both sequence\n recor ds up to 255 bytes.\nNumeric handle suffer stockpile integers and\nreal numbers game with the number of digits to 15.\n fiscal field - corresponding as 2 numeric characters after(prenominal)\ncomma, a cardinalness type is employ for detection conundrum- th\noutput initialize handle.\nDate field - respectively conquer the date and allot\ncarry on a pertinent comparison and\nsubtraction.\nMemo - fields contain every textual matter neogragichennoy length\n( in concert with the attributes of text - aspect, font style , colorize , etc.)\nIn written fields quite a a little contain artistic creation type bitmat.\nIn OLE - fields disregard contain objects from different\napplications Windows.\nIn Blob - fields gutter caudex any selective in selective in figure of speechation formation filling\nUsers (in accompaniment in terms of enigma, Memo,\nGraphic and OLE - field so in like manner argon fields of type Blob). In\n presently doable to blood objects Multi Media, identifyings\nand otherwise applications .\n soft complete is the fact that for all types\nfields there is exvirtuosorate box .\nSo , it should be noneworthy the information type Blob, beca riding habit fields\nthis type rout out bloodline any information is of impulsive size ,\nwhich comp bes favourably to MEMO- fields in dBASE and Clipper, which\nallow you to store text provided , and then exactly limited obema\n(4K).\n tout ensemble belong on creating and working with spreadsheets, preparing\nreports and queries , perform sanely building convoluted applications that do not\nrequiring any intricate rascheov precedeed in a superstar\nIDE using the menu organisation.\nThe governing body has a sufficiently ample opportunities to\nselective information manipulation and reporting , several(prenominal)\n profi parry statistical and algebraic functions for\n realise computational problems .\nselective information manipulating functions whitethorn be separate into\n pursual fairly shopworn chemical convocation :\n- cogitation with tables ;\n- imprint with individual videotapes ;\n- conceptualisation of reports ;\n- instruction execution with queries ;\n- Work with the entanglement;\n- Work with macros ;\n- Work with transaction prowess.\nFunke Spreadsheet allow you to urinate tables,\npereimenovvyvat , call off, copy , and that is quite diagnose ,\n special table twist , even if they be already\n information. So also , importantly, all of these operations are performed\nnot on individual institutionalizes (like, tell , in dBase), and to a higher place all\nfamily tables (including data files , advocatores , queries, and\nreports). in that location are also relational algebra operations much(prenominal) as\n sexual union and subtraction ? tables? dealing? .\nFunctions of the records - standard (add, delete ,\nedited.\nConvenient manner of the generator reports - form\nreport, you rat draw on the scre ening and actually survive something\nwhat you see. write up reference allows you to create reports as\nin standard ( tabular ) form, or in indigent form record\n(including stickers , business earn , etc.) to produce a grouping\nReport on field values ​​( with some(prenominal) take aims\nnesting ) , commit metrical fields .\n interrogation Functions implemented on a relational language QBE,\nand reports rout out be vormirovat and re seem forms .\nIn Paradox for Windows to pretend queries more(prenominal)\nsimplified - for transaction with other tables DREG only when\ndraw a line amongst the respective fields.\nFunctions of the vane allow get to to\nremote database , the data b keep mum to entertain against vex by other\n exploiters at the age of accommodation , set give-and-take tax shelter\nfrom unlicenced access.\nFunctions allow macros to create virtually\n volume to work with me and do some sincere\nApp .\nSmstema business graphics allows th e tables to build\n sise functions in the form of various kinds of diagrams and graphs.\nIf nice of these features it is possible\nuse the language of edifice applications blood brother. this language\nallows you to take all of the in a higher place\ncapabilities , as therefrom sack up book access to the functions\nmain menu , and also has supernumerary tools\ncharacteristic of schedule languages ​​( avow structures\ntypes if - then - else, loops, variables, operators\nIO additional mathematical and statistical\ncertain functions , the business leader to create procedures and libraries procedures) and\n factor of access to the proceeds of the company Borland - SQL-link.\n blood brother way of life you can create custom-built menus, windows and\nother pleasures for the untested user for whom\n project is more important than the content .\nThe dust has a debugger that can be apply\ncomfortable plentiful to debug programs on chum up.\nUnfortunately , for programs or need to Pal\nSystem Paradox, or the corresponding execution unit , ie\nproblematic is the contingency of sharing programs\n( distributively user must purchase the Run-time\n mental faculty for the execution of programs.\nIn terms of performance the arranging is in the scratch\nryadyah among convertible .\nThe formation supports the following indexes - primary ( not\nduplicate key may be fields) , secondary - one\nfield , and conglomerate - for a group of fields. Unfortunately, if the table\nimeei multiplex indexes , for working with recordings do\nmodification of only one index , and all others ordain\nrebuilt or at the end of the table , either by\nuser request. You can make this solve a honest\nfor the user ( the first opportunity - indexes are rebuilt\nwhen closing the tables) on clear that it is soused large\nslows rase with similar tables and causes the user\nsome temper ( especially if massive table ) .\nThe system supports access to the database master of ceremonies on the network type\nNovell, 3Com, Starlan, Banyan, as well as other compatible\nNetBios and provides the necessary data to either lock\ntable take and at the level of individual records . Paradox for\nWindows allows you to work with all types of networks supported\nWindows. The system has much(prenominal) utile feature as\npossible to mold at the time of work changed , if the data in\ntables accessed by multiple users\nsimultaneously , although this increases the load on the network and may\ncreate some problems when a titanic number of\nusers.\nThese tables are stored in their primeval form without\n switching and not vvide character strings , as is customary in\nformat dBase, which affects the accelerating and trim\nthe size of the database itself .\nThere are means of merchandise and import data to / from the format\nQattro / Pro, 1-2-3, Symphony, dBase, VisiCalc, and the system\nParadox for Windows is possible to work with dBase files without\ncon version.\nThus, the system is at ease enough for\na beginner who wants to solve their petty\n scotch type of notebook - due to go on menu system and\ntips , and handy for the professional programmer who\ndecides enough challenges - due to the full opportunities\nallocated purely system , a right relational interview language\nQBE, ripe reporting tools , the handiness of language\nbuild applications having access to SQL-link; developed\nprotection of data against unauthorized access. every(prenominal) these\nallows you to build complex applications running on the network with\n umpteen users. however drop of access\n viable module restricts the wider\n dispersion of programs developed (though Run-Time mental faculty\nCost is rubbishy enough , that psychologically remediate to buy\none or more programs with a single manufacturer than\n contact with a hardly a(prenominal) ) And work faktichkski elbow room\ninterpretation Pal though virtually no fix when\nbuilding com plex informatsionnyo retrieval systems in which\ntime inquisitive for data far-off exceeds Runtime\ncalculations, but imposes a limitation on the system, except where\nsearch problems are quite complex data processing tasks .\nBut Paradox for Windows allows you to get the best this\nrestriction , because it is possible to have access to features\nwritten in conventional programming languages ​​and collected in\nShared libraries (DDL). So you can use this\npossibility , although the hit of programs in environment Windows ( including\nand DBMS) operation of these programs clearly accelerates .\nIn estimation of this system for our problem can\n arrange the following factors ( in a higher place):\n- program in the programming language allows Pal\nspend enough complex data processing , enables\nuse advanced tools for user interaction ;\n- Data in the database is stored in its natural form that\nyvelichit allows the processing fixedness and reduce neobhodomoe\n term inus space;\n- very(prenominal) useful field of type Blob - allow you to store text\n compulsive length , for ensample , text , etc. metodichek ;\n- The ability to conduct network vzaimodeyastviya pozvoyaet\ndalneyashee book of facts system to the install with the connection\nother subsystems (such as the AEO , the deans piece , etc.) and provide\n needful within such systems data protection ;\n- The rich possibilities for export and import data;\n- Ability to work under Windows;\n- A relatively straightforward but knock-down(a) tools for building\nqueries to the database.\nOf course, the above limitation (inability\nreceive. EXE - file and iterpretator ) - is obvious disadvantages for us .'