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S  0< ``  `*  0( `   b*  0 `   b*H  0޽h ? ̙33 Default Design& ME0 (  r  S l 3p 3 X  C 0Amaster page   <*` _ laborator 1  H  0޽h ? ̙33y___PPT10Y+D=' = @B +   tv (  tx t c $0{3p 3 Z t C 2Amaster page2 t <'` vGeneralitci  r  t 03 vnf___PPT9H@ SGBD  Sistem de gestiune a bazelor de date Instrument de asamblare, codificare, aranjare, proteccie _i regsire a datelor dintr-o baz de date Exemple: dBase, FoxBase, FoxPro, Oracle, Access, SQLServer, MySql, PostrgeSql. Funcciile unui SGBD Memorarea (pstrarea datelor) Gestiunea datelor _i a legturilor dintre ele Introducerea _i _tergerea datelor Baza de date - definicii O mulcime de informacii ce modeleaz un univers Ansamblu de date elementare structurate, accesibile unei comunitci de useri Coleccie de date (nregistrri) aflate in interdependenc, mpreun cu descrierea datelor _i a relaciilor dintre ele. n mod normal prin baz de date se ncelege orice coleccie partajat de date, ntre care exist relacii logice, cu o descriere a datelor, proiectat pentru a satisface necesitcile informacionale ale unei organizacii sau grup de utilizatori. Modele de organizare a datelor Modelul relacional (bazat pe teoria matematic a relaciilor) - SGBDR Modelul ierarhic Modelul recea,i  i n i  i d ,n   dv    H t 0޽h ? ̙33y___PPT10Y+D=' = @B +@ g_ (  x  c $3p 3 Z  C 2Amaster page2  <3`_  aExemple de SGBD  03 p  F>6___PPT9 Zx Oracle. Este realizat de firma Oracle Corporation USA. Sistemul este complet relacional, robust, bazat pe SQL standard extins. Permite lucrul cu obiecte _i distribuit. Are BD Internet _i modul de optimizare a regsirii. DB2. Este realizat de firma IBM. Sistemul respect teoria relacional, este robust _i se bazeaz pe SQL standard. Permite lucrul distribuit _i are modul de optimizare a regsirii. Informix. Este realizat de firma Informix, respect teoria relacional _i permite lucru distribuit. Progress. Este realizat de firma Progress Software. Are limbaj propriu (Progress 4GL) dar suport _i SQL. Ruleaz pe o gam larg de calculatoare sub diferite sisteme de operare. SQL Server. Este realizat de firma Microsoft. Se bazeaz pe SQL _i ruleaz n arhitectura client/server. Ingress II. Este realizat de firma Computer Associates. Este un SGBDR complet, implementeaz dou limbaje relacionale (nti QUEL _i apoi SQL) _i este suportat de diferite sisteme de operare (Windows, UNIX). Lucreaz distribuit n arhitectura client/server, are extensie cu facilitci orientate obiect _i permite aplicacii de tip Internet. Organizarea fizic a tabelelor se face prin sistemul de operare. Visual FoxPro. Este realizat de firma Microsoft. Are un limbaj procedural propiu foarte puternic, o extensie orientat obiect, programare vizual _i nucleu extins de SQL. Access. Este realizat de firma Microsoft. Se bazeaz pe SQL, are limbajul procedural gazd (Basic Access) _i instrumente de dezvoltare. Paradox. Este realizat de firma Borland. Are limbaj procedural propiu (PAL) _i suport SQL.J=  Y \ S^ a<% p`PpH  0޽h ? ̙33y___PPT10Y+D=' = @B +     (  x  c $3p 3 Z  C 2Amaster page2  <3`I z(Elemente specifice ale unei baze de date))(   0V pxp___PPT9RJ Concepte utilizate n modelarea bazelor de date Entitatea Obiect distinct al bazei de date, reprezentat prin proprietcile sale (numite atribute) Substantivele sunt asociate entitcilor Nu pot exista dou entitci cu acela_i nume _i nici o entitate cu dou nume diferite Atributul Atributul reprezint o proprietate care descrie o anumit caracteristic a unei entitci Realizarea unei entitci Mulcimea format din cte o valoare pentru fiecare atribut al entitcii Relaciile dintre entitci Exprim legturile, asociaciile dintre entitci, asigurnd comunicarea ntre acestea Verbele sunt asociate relaciilor dintre entitcii Cheia primar Asigur posibilitatea identificrii unice a unei entitci Trebuie s nu concin informacii descriptive, s fie simpl, neambigu, stabil ;i   i Y i H i  i   1  YH       <<V: :  H  0޽h ? ̙33y___PPT10Y+D=' = @B +   L (  x  c $< Vp V Z  C 2Amaster page2  <P3`  2Cardinalitatea relaciilor   0X/V P H DCardinalitatea relaciilor cardinalitatea este dat de numrul de tupluri (de elemente ale unei relacii) de exemplu: Cci studenci sunt nscri_i ntr-o grup?& .. MULbI n cte grupe poate fi nscris la un moment dat un student? & UNA Raportul de cardinalitate unu la mai mulci (one to many) Relacia  GRUPA  concine  STUDENT este  one to many O grup concine mai mulci studenci Un student nu poate fi nscris n mai multe grupe unu la unu (one to one) Relacia  STUDENT  conduce  GRUPA este  one to one Un singur student poate conduce o grup (_eful de grup) Un student nu poate conduce mai multe grupe mai mulci la mai mulci (many to many) Relacia  STUDENT  nvac  MATERIE este  many to many Un student poate studia mai multe materii O materie poate fi studiat de mai mulci studenci -& GGgGG g GGG%gGG6AW?/,c,-_  <+V: :  H  0޽h ? ̙33y___PPT10Y+D=' = @B +  @ 8 0(  x  c $-Vp V Z  C 2Amaster page2  <*V` `Tipuri de cheiP  0@XV P^VN___PPT90( Cheie (cmpul cheie) Un cmp este considerat cmp cheie dac poate fi folosit la realizarea relaciilor ntre tabele (concine date pe care tabelele le au in comun _i poate servi la identificarea unic a nregistrrilor dintr-o tabel) Tipurile de chei Cheia primar (primary key) Cheia compus (composite key) Chei candidate (candidate key) Cheia extern (foreign key) \ v  GG GjGGGG9GG    <tV: :  H  0޽h ? ̙33y___PPT10Y+D=' = @B +    @N (  x  c $rVp V Z  C 2Amaster page2(  <3`  6Cheia primar (primary key)Hr  0xV RJB___PPT9$ : Fiecare tabel dintr-o baz de date relacional trebuie s aib un identificator unic, constnd din unul sau mai multe cmpuri, altfel nu pot fi definite relaciile ntre tabele. Cmpul sau grupul de cmpuri ce constituie identificatorul unic, reprezint cheia primar. Cheia primar trebuie s poat asigura unicitatea, de aceea nu se accept valori duplicate pentru acest cmp (se recomand ca tipul de dat folosit pentru cmpul ce constituie cheia primar s fie de tip AutoNumber  dar se poate opta _i pentru folosirea a_a-ziselor chei naturale - valorile, n acest caz, sunt coduri generate conform unei anumite reguli, cum ar fi, de exemplu, codul numeric personal). Chei candidate (candidate key)  cmpuri (altele dect cheia primar) care ndeplinesc condiciile necesare cheii primare.  x GG GG G2GG|G{G@ ^  <V: :  H  0޽h ? ̙33y___PPT10Y+D=' = @B +C  j b P (  x  c $Vp V Z  C 2Amaster page2,  <3`J :Cheia compus (composite key)H    0V VNF___PPT9(  \ n unele cazuri o nregistrare nu poate fi identificat unic printr-un singur cmp. n aceste cazuri se folose_te o cheie compus. Grupul de cmpuri ce constituie identificatorul unic va reprezenta cheia primar pentru tabelul respectiv, dar va fi o cheie compus. De_i n cmpurile unei chei compuse se accept valori duplicate, nu se accept combinacii de valori duplicate. Exemplu: un eveniment poate fi reprezentat, pentru constituirea situaciei de ocupare a unei sli de conferinte, prin cheia compus format din ziua si ora la care va avea loc. La o anumit or, pentru o zi dat, nu poate avea loc dect un anumit eveniment. Cu toate acestea se permit valori duplicate pentru fiecare cmp n parte (zi _i or)  putem avea mai multe valori de  miercuri a cmpului zi _i mai multe valori de  14 pentru cmpul or, dar un singur eveniment se va tine  miercuri la ora  14 n sala respectiv.   x GtG GEG GG GG&   <0V: :  H  0޽h ? ̙33y___PPT10Y+D=' = @B +    ` (  x  c $ЦVp V Z  C 2Amaster page2(  <V`u  6Cheia extern (foreign key)H  0V TLD___PPT9& ^ O cheie extern reprezint un cmp sau un grup de cmpuri dintr-un tabel ce fac legtura cu cheile primare ale altor tabele. Prin cheile externe se realizeaz relaciile dintre tabele. Exemplu: Avem tabela  carti ce contine _i un cmp numit  autor  ce reprezint codul asociat unui autor. Avem o tabel separat numit  autori ce concine o cheie primar numit  id_autor . Cele dou cmpuri fac legtura ntre tabele. Cmpul  autor reprezint o cheie extern n tabela  carti _i face legtura cu cheia primar a tabelei  autori  numit  id_autor .  -xx G GjA   <V: :  H  0޽h ? ̙33y___PPT10Y+D=' = @B +    p (  x  c $dVp V Z  C 2Amaster page2  <V`5 nNormalizarea bazelor de date   0V  `d\T___PPT96. F 2 Normalizarea  reprezint conceperea tabelelor conform modelului relacional. Este o teorie construit n jurul conceptului de forme normale (FN), care amelioreaz structura BDR prin nlturarea treptat a unor neajunsuri (anomalii de inserare, modificare, _tergere) _i prin imprimarea unor facilitci sporite privind manipularea datelor Scopul  ndeprtarea datelor redundante din tabele (forma de normalizare 1NF). Rezultatul: Baza de date este mai flexibil _i poate suporta mai bine eventualele schimbri ale structurii sale. Se va economisi spaciu  baza de date va ocupa mai pucin spaciu. Recomandri: Trebuie ca fiecare tabel s concin cheie primar pentru identificarea unic a nregistrrilor. Un cmp va concine o informacie unic (va fi atomic  nu se poate  sparge n mai multe cmpuri)  de exemplu nu se va pstra n acela_i cmp _i numele _i prenumele unei persoane. Se vor elimina datele redundante.   x " xx  x7 " xxx G GG>G G*GG GG G7GGG   <4W: :  H  0޽h ? ̙33y___PPT10Y+D=' = @B +A  h `  (  x  c $p  Z  C 2Amaster page2  <(`H x&Etape de constituire a bazelor de date''&  <: :  `  03 0vnf___PPT9H@ Identificarea datelor necesare (a tipurilor de entitci, de relacii, cardinalitatea relaciilor) Identificarea atributelor (a cmpurilor) Identificarea cheilor candidat _i alegerea cheilor primare Gruparea datelor redundante n a_a-numitele tabele de alegere (lookup table), ce vor fi legate la tabelele principale prin chei externe. Crearea unei diagrame a relaciilor dintre date (relaciile dintre tabele) Normalizarea bazei de date Identificarea datelor specifice cmpurilor numele cmpurilor, tabelelor identificarea tipului de date potrivit fiecrui cmp determinarea regulilor de validare, a valorilor implicite etc. Crearea propriu-zis a tabelelor (pentru Access  se va prefera crearea tabelelor n modul design) h x x x xc x xA)g;c  @HH  0޽h ? ̙33y___PPT10Y+D=' = @B +rD  <I(Wabn{s? $Oh+'0T hp   PowerPoint Presentationoweowe Bebe Strumf65eMicrosoft PowerPointon@p 49@@gn)GSg  )'    """)))UUUMMMBBB999|PP3f333f3333f3ffffff3f̙3ff333f333333333f33333333f33f3ff3f3f3f3333f33̙33333f333333f3333f3ffffff3f33ff3f3f3f3fff3ffffffffff3ffff̙fff3fffff3fff333f3f3ff3ff33f̙̙3̙ff̙̙̙3f̙3f333f3333f3ffffff3f̙3f3f3f333f3333f3ffffff3f̙3f3ffffffffff!___www4'A x(xKʦ """)))UUUMMMBBB999|PP3f3333f333ff3fffff3f3f̙f3333f3333333333f3333333f3f33ff3f3f3f3333f3333333f3̙33333f333ff3ffffff3f33f3ff3f3f3ffff3fffffffff3fffffff3f̙ffff3ff333f3ff33fff33f3ff̙3f3f3333f333ff3fffff̙̙3̙f̙̙̙3f̙3f3f3333f333ff3fffff3f3f̙3ffffffffff!___wwwü޻ϑϒ⼼llffflfk׼ݵּܶ׻lfflffllflϽ⼼ݼ⼼¼޻ýݼݼôfffff޴lflffffllⵆfffllllfôflffflfݒffllllll⯆fffffflfflݑelllfõfllfflffffϼݴlfffflff¯flfflffffllllfflφlfffff޴fflffflffµffllflffflϼݒflfkflfޑfllffflllllllffflϽffffff⒆lflfflflfllݒflffflflffflelݍllllfll⒆llfflîfflflfllll޴flffffôlfflllfll¯llfllflf´ffflffflⵆffflflfllfffffffޑlllllfflf¯ffkklôllfflffllôffllllflfݑlffffelõlllflll޼ݼܼݼݼݶݻݼܼܼݼܼݼݼݼޑfllffffflfllϮϮ޴fflfflllݒfflflflfllfllmϮ޴flffflϋϮϮϮϮϑ⒆lflfllllllfllllmllmmmlݑfflflfffff½ýýýݽ޽⽽޼ü޼ݽ޽½ݽ½ý޽ý޽⽓gfmgmfmfggfglmgmllgmmfgllfgmlgfޒfllflfgflm޼޽ýý½ýýݽýýý⽼ýý⽽ýݽ½޽⽽ü޴fellflDD>?ELoL޼ޙý޽tüݔ´kllffffgD@$?EELuonoottotttttttotôfflllgD$$?FooLooototoioÔ޼nottݒflllffff$? $?EoEottooޙn޽ntlfllgD?$?$?Eݎotü½“ttütooto⯆lfflffff??$$EF޽ü޼޽޼޼ýÑfflfD???$FݒllflfgD$?$?h޴llllffg??$ ?E$Eݒffllfg$?$E⯆lflfllf?$??$?hÚޑlflflf$?$$@$F⒋lflflfD>$?EöttÓoooޓttöÓtttflllflg??$EKnotiotnootittnottiuitttnooÓnootnonnottooo޼toitootޑllflffE$$??EÓoooontittoootLttntooLLotootoooޙitötitoontoo޽tonoýsononti´fffffg?? 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