(. 1.3):
- -;
- -;
- ;
- /.
. 1.3.
(. 1.1), . .
1.1.
PS | Presentation Services ( ) | , , PL, |
PL | Presentation Logic ( ) | . , |
BL | Business or Application Logic ( ) | , , |
DL | Data Logic ( ) | (SQL-), |
DS | Data Services ( ) | , , , , . . SQL- |
FS | File Services ( ) | . () |
-
- PS PL , . - , . .
- , PL, BL DL. , .
: , . - . - . , ( ), - . , - . , , .
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- - , . - , SQL (Structured Query Language) , . , , , . , , SQL- .
- , . , PS PL , . DS FS , (PS, PL), BL DL - . - : . (. 1.4.).
. 1.4. -
, . , , , . SQL- , , . , .
BL . . SQL , , , .
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, . , ( ).
, , . , . : , . - . , .
- . , . UNIX. - . . , .
- . .