L-impetu għall-kitba ta’ dan l-iskeċċ kien l-artiklu . Sibt ukoll l-artiklu ppubblikat 4 snin ilu interessanti - .
Deher interessanti li l-istess ħsieb - "timplimenta loġika tan-negozju fid-database".
Ma kontx jien biss li ġejt f’moħħi.
Ukoll, għall-futur, ridt nippreserva, l-ewwelnett, għalija nnifsi, żviluppi interessanti li qamu waqt l-implimentazzjoni. Speċjalment meta wieħed iqis li relattivament reċentement ittieħdet deċiżjoni strateġika biex tinbidel l-arkitettura u tittrasferixxi l-loġika tan-negozju għal-livell backend. Sabiex dak kollu li ġie żviluppat dalwaqt ma jkun ta’ ebda użu għal ħadd u ma jkun ta’ interess għal ħadd.
Il-metodi deskritti mhumiex xi tip ta 'skoperta jew eċċezzjonali. taf kif, kollox huwa klassiku u ġie implimentat diversi drabi (per eżempju, użajt approċċ simili 20 sena ilu fuq Oracle).Ddeċidejt biss li niġbor kollox f'post wieħed. Fil-każ li tiġi utli għal xi ħadd. Kif wriet il-prattika, ħafna drabi l-istess idea tiġi lil nies differenti b'mod indipendenti. U huwa utli li żżommha għalik innifsek bħala tifkira.
Naturalment, xejn f'din id-dinja mhu perfett, żbalji u typos sfortunatament huma possibbli. Il-kritika u l-kummenti huma milqugħa u mistennija bil-qawwa U dettall żgħir ieħor - dettalji speċifiċi tal-implimentazzjoni jitħallew barra. Xorta waħda, kollox għadu jintuża fi proġett ta 'ħidma reali. Allura, l-artiklu huwa biss skeċċ u deskrizzjoni tal-kunċett ġenerali, xejn aktar. Nispera li jkun hemm biżżejjed dettalji biex tifhem l-istampa ġenerali.
L-idea ġenerali hija "taqsam u tirbaħ, aħbi u stess"
L-idea hija klassika - skema separata għat-tabelli, skema separata għall-funzjonijiet maħżuna.
Il-klijent m'għandux aċċess għad-data direttament. Kull ma jista 'jagħmel il-klijent huwa li jsejjaħ il-funzjoni maħżuna u jipproċessa r-rispons riċevut.
Rwoli
CREATE ROLE store;
CREATE ROLE sys_functions;
CREATE ROLE loc_audit_functions;
CREATE ROLE service_functions;
CREATE ROLE business_functions;
Skemi
Skema tal-ħażna tal-mejda
Tabelli ta' mira li jimplimentaw entitajiet suġġetti.
CREATE SCHEMA store AUTHORIZATION store ;
Dijagramma tal-funzjoni tas-sistema
Funzjonijiet tas-sistema, b'mod partikolari għall-illoggjar tal-bidliet fit-tabella.
CREATE SCHEMA sys_functions AUTHORIZATION sys_functions ;
Skema ta' verifika lokali
Funzjonijiet u tabelli biex jimplimentaw verifika lokali tal-eżekuzzjoni ta 'funzjonijiet maħżuna u bidliet fit-tabelli fil-mira.
CREATE SCHEMA loc_audit_functions AUTHORIZATION loc_audit_functions;
Dijagramma tal-funzjoni tas-servizz
Funzjonijiet għal funzjonijiet ta' servizz u DML.
CREATE SCHEMA service_functions AUTHORIZATION service_functions;
Dijagramma tal-funzjoni tan-negozju
Funzjonijiet għall-funzjonijiet finali tan-negozju msejħa mill-klijent.
CREATE SCHEMA business_functions AUTHORIZATION business_functions;
Drittijiet ta 'aċċess
Rwol - DBA għandu aċċess sħiħ għall-iskemi kollha (separati mir-rwol ta' Sid tad-DB).
CREATE ROLE dba_role;
GRANT store TO dba_role;
GRANT sys_functions TO dba_role;
GRANT loc_audit_functions TO dba_role;
GRANT service_functions TO dba_role;
GRANT business_functions TO dba_role;
Rwol - UTENT għandu l-privileġġ EŻEKUTTA fid-dijagramma funzjonijiet_negozju.
CREATE ROLE user_role;
Privileġġi bejn skemi
GĦOTJA
Peress li l-funzjonijiet kollha huma maħluqa bl-attribut DEFINITUR TA' SIGURTÀ istruzzjonijiet meħtieġa REVOKE EXECUTE FUQ IL-FUNZJONI KOLLHA... MILL-pubbliku;
REVOKE EXECUTE ON ALL FUNCTION IN SCHEMA sys_functions FROM public ;
REVOKE EXECUTE ON ALL FUNCTION IN SCHEMA loc_audit_functions FROM public ;
REVOKE EXECUTE ON ALL FUNCTION IN SCHEMA service_functions FROM public ;
REVOKE EXECUTE ON ALL FUNCTION IN SCHEMA business_functions FROM public ;
GRANT USAGE ON SCHEMA sys_functions TO dba_role ;
GRANT EXECUTE ON ALL FUNCTIONS IN SCHEMA sys_functions TO dba_role ;
GRANT USAGE ON SCHEMA loc_audit_functions TO dba_role ;
GRANT EXECUTE ON ALL FUNCTIONS IN SCHEMA loc_audit_functions TO dba_role ;
GRANT USAGE ON SCHEMA service_functions TO dba_role ;
GRANT EXECUTE ON ALL FUNCTIONS IN SCHEMA service_functions TO dba_role ;
GRANT USAGE ON SCHEMA business_functions TO dba_role ;
GRANT EXECUTE ON ALL FUNCTIONS IN SCHEMA business_functions TO dba_role ;
GRANT EXECUTE ON ALL FUNCTIONS IN SCHEMA business_functions TO user_role ;
GRANT ALL PRIVILEGES ON SCHEMA store TO GROUP business_functions ;
GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA store TO business_functions ;
GRANT USAGE ON ALL SEQUENCES IN SCHEMA store TO business_functions ;
Allura l-iskema tad-database hija lesta. Tista' tibda timla d-dejta.
Tabelli tal-mira
Il-ħolqien ta' tabelli huwa trivjali. Ebda karatteristiċi speċjali, ħlief li ġie deċiż li ma tużax SERJAL u jiġġeneraw sekwenzi b'mod espliċitu. Barra minn hekk, ovvjament, użu massimu ta 'struzzjonijiet
COMMENT ON ...Kummenti għal Kollha oġġetti, mingħajr eċċezzjoni.
Verifika lokali
Biex tilloggja l-eżekuzzjoni tal-funzjonijiet maħżuna u l-bidliet fit-tabelli fil-mira, tintuża tabella tal-verifika lokali, li tinkludi, fost affarijiet oħra, dettalji tal-konnessjoni tal-klijent, it-tikketta tal-modulu msejjaħ, u l-valuri attwali tal-input u parametri tal-output fil-forma ta 'JSON.
Funzjonijiet tas-sistema
Iddisinjat għall-illoggjar tal-bidliet fit-tabelli fil-mira. Huma funzjonijiet grillu.
Mudell - funzjoni tas-sistema
---------------------------------------------------------
-- INSERT
CREATE OR REPLACE FUNCTION sys_functions.table_insert_log ()
RETURNS TRIGGER AS $$
BEGIN
PERFORM loc_audit_functions.make_log( ' '||'table' , 'insert' , json_build_object('id', NEW.id) );
RETURN NULL ;
END
$$ LANGUAGE plpgsql SECURITY DEFINER;
CREATE TRIGGER table_after_insert AFTER INSERT ON storage.table FOR EACH ROW EXECUTE PROCEDURE sys_functions.table_insert_log();
---------------------------------------------------------
-- UPDATE
CREATE OR REPLACE FUNCTION sys_functions.table_update_log ()
RETURNS TRIGGER AS $$
BEGIN
IF OLD.column != NEW.column
THEN
PERFORM loc_audit_functions.make_log( ' '||'table' , 'update' , json_build_object('OLD.column', OLD.column , 'NEW.column' , NEW.column ) );
END IF ;
RETURN NULL ;
END
$$ LANGUAGE plpgsql SECURITY DEFINER;
CREATE TRIGGER table_after_update AFTER UPDATE ON storage.table FOR EACH ROW EXECUTE PROCEDURE sys_functions.table_update_log ();
---------------------------------------------------------
-- DELETE
CREATE OR REPLACE FUNCTION sys_functions.table_delete_log ()
RETURNS TRIGGER AS $$
BEGIN
PERFORM loc_audit_functions.make_log( ' '||'table' , 'delete' , json_build_object('id', OLD.id ) );
RETURN NULL ;
END
$$ LANGUAGE plpgsql SECURITY DEFINER;
CREATE TRIGGER table_after_delete AFTER DELETE ON storage.table FOR EACH ROW EXECUTE PROCEDURE sys_functions.table_delete_log ();Funzjonijiet ta' servizz
Iddisinjat biex jimplimenta operazzjonijiet ta 'servizz u DML fuq tabelli fil-mira.
Mudell - funzjoni tas-servizz
--INSERT
--RETURN id OF NEW ROW
CREATE OR REPLACE FUNCTION service_functions.table_insert ( new_column store.table.column%TYPE )
RETURNS integer AS $$
DECLARE
new_id integer ;
BEGIN
-- Generate new id
new_id = nextval('store.table.seq');
-- Insert into table
INSERT INTO store.table
(
id ,
column
)
VALUES
(
new_id ,
new_column
);
RETURN new_id ;
END
$$ LANGUAGE plpgsql SECURITY DEFINER;
--DELETE
--RETURN ROW NUMBERS DELETED
CREATE OR REPLACE FUNCTION service_functions.table_delete ( current_id integer )
RETURNS integer AS $$
DECLARE
rows_count integer ;
BEGIN
DELETE FROM store.table WHERE id = current_id;
GET DIAGNOSTICS rows_count = ROW_COUNT;
RETURN rows_count ;
END
$$ LANGUAGE plpgsql SECURITY DEFINER;
-- UPDATE DETAILS
-- RETURN ROW NUMBERS UPDATED
CREATE OR REPLACE FUNCTION service_functions.table_update_column
(
current_id integer
,new_column store.table.column%TYPE
)
RETURNS integer AS $$
DECLARE
rows_count integer ;
BEGIN
UPDATE store.table
SET
column = new_column
WHERE id = current_id;
GET DIAGNOSTICS rows_count = ROW_COUNT;
RETURN rows_count ;
END
$$ LANGUAGE plpgsql SECURITY DEFINER;Funzjonijiet tan-negozju
Iddisinjat għal funzjonijiet kummerċjali finali msejħa mill-klijent. Dejjem jirritornaw - JSON. Biex tinterċetta u tilloggja l-iżbalji ta' eżekuzzjoni, uża l-blokk EĊĊEZZJONI.
Mudell - funzjoni tan-negozju
CREATE OR REPLACE FUNCTION business_functions.business_function_template(
--Input parameters
)
RETURNS JSON AS $$
DECLARE
------------------------
--for exception catching
error_message text ;
error_json json ;
result json ;
------------------------
BEGIN
--LOGGING
PERFORM loc_audit_functions.make_log
(
'business_function_template',
'STARTED',
json_build_object
(
--IN Parameters
)
);
PERFORM business_functions.notice('business_function_template');
--START BUSINESS PART
--END BUSINESS PART
-- SUCCESFULLY RESULT
PERFORM business_functions.notice('result');
PERFORM business_functions.notice(result);
PERFORM loc_audit_functions.make_log
(
'business_function_template',
'FINISHED',
json_build_object( 'result',result )
);
RETURN result ;
----------------------------------------------------------------------------------------------------------
-- EXCEPTION CATCHING
EXCEPTION
WHEN OTHERS THEN
PERFORM loc_audit_functions.make_log
(
'business_function_template',
'STARTED',
json_build_object
(
--IN Parameters
) , TRUE );
PERFORM loc_audit_functions.make_log
(
'business_function_template',
' ERROR',
json_build_object('SQLSTATE',SQLSTATE ), TRUE
);
PERFORM loc_audit_functions.make_log
(
'business_function_template',
' ERROR',
json_build_object('SQLERRM',SQLERRM ), TRUE
);
GET STACKED DIAGNOSTICS error_message = RETURNED_SQLSTATE ;
PERFORM loc_audit_functions.make_log
(
'business_function_template',
' ERROR-RETURNED_SQLSTATE',json_build_object('RETURNED_SQLSTATE',error_message ), TRUE );
GET STACKED DIAGNOSTICS error_message = COLUMN_NAME ;
PERFORM loc_audit_functions.make_log
(
'business_function_template',
' ERROR-COLUMN_NAME',
json_build_object('COLUMN_NAME',error_message ), TRUE );
GET STACKED DIAGNOSTICS error_message = CONSTRAINT_NAME ;
PERFORM loc_audit_functions.make_log
(
'business_function_template',
' ERROR-CONSTRAINT_NAME',
json_build_object('CONSTRAINT_NAME',error_message ), TRUE );
GET STACKED DIAGNOSTICS error_message = PG_DATATYPE_NAME ;
PERFORM loc_audit_functions.make_log
(
'business_function_template',
' ERROR-PG_DATATYPE_NAME',
json_build_object('PG_DATATYPE_NAME',error_message ), TRUE );
GET STACKED DIAGNOSTICS error_message = MESSAGE_TEXT ;
PERFORM loc_audit_functions.make_log
(
'business_function_template',
' ERROR-MESSAGE_TEXT',json_build_object('MESSAGE_TEXT',error_message ), TRUE );
GET STACKED DIAGNOSTICS error_message = SCHEMA_NAME ;
PERFORM loc_audit_functions.make_log
(s
'business_function_template',
' ERROR-SCHEMA_NAME',json_build_object('SCHEMA_NAME',error_message ), TRUE );
GET STACKED DIAGNOSTICS error_message = PG_EXCEPTION_DETAIL ;
PERFORM loc_audit_functions.make_log
(
'business_function_template',
' ERROR-PG_EXCEPTION_DETAIL',
json_build_object('PG_EXCEPTION_DETAIL',error_message ), TRUE );
GET STACKED DIAGNOSTICS error_message = PG_EXCEPTION_HINT ;
PERFORM loc_audit_functions.make_log
(
'business_function_template',
' ERROR-PG_EXCEPTION_HINT',json_build_object('PG_EXCEPTION_HINT',error_message ), TRUE );
GET STACKED DIAGNOSTICS error_message = PG_EXCEPTION_CONTEXT ;
PERFORM loc_audit_functions.make_log
(
'business_function_template',
' ERROR-PG_EXCEPTION_CONTEXT',json_build_object('PG_EXCEPTION_CONTEXT',error_message ), TRUE );
RAISE WARNING 'ALARM: %' , SQLERRM ;
SELECT json_build_object
(
'isError' , TRUE ,
'errorMsg' , SQLERRM
) INTO error_json ;
RETURN error_json ;
END
$$ LANGUAGE plpgsql SECURITY DEFINER;Total
Biex tiddeskrivi l-istampa ġenerali, naħseb li huwa pjuttost biżżejjed. Jekk xi ħadd hu interessat fid-dettalji u r-riżultati, ikteb kummenti, inkun kuntent li nżid aktar kuntatti mal-istampa.
PS
Logging żball sempliċi - tip ta 'parametru ta' input
-[ RECORD 1 ]-
date_trunc | 2020-08-19 13:15:46
id | 1072
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | STARTED
jsonb_pretty | {
| "dko": {
| "id": 4,
| "type": "Type1",
| "title": "CREATED BY addKD",
| "Weight": 10,
| "Tr": "300",
| "reduction": 10,
| "isTrud": "TRUE",
| "description": "decription",
| "lowerTr": "100",
| "measurement": "measurement1",
| "methodology": "m1",
| "passportUrl": "files",
| "upperTr": "200",
| "weightingFactor": 100.123,
| "actualTrValue": null,
| "upperTrCalcNumber": "120"
| },
| "CardId": 3
| }
-[ RECORD 2 ]-
date_trunc | 2020-08-19 13:15:46
id | 1073
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR
jsonb_pretty | {
| "SQLSTATE": "22P02"
| }
-[ RECORD 3 ]-
date_trunc | 2020-08-19 13:15:46
id | 1074
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR
jsonb_pretty | {
| "SQLERRM": "invalid input syntax for type numeric: "null""
| }
-[ RECORD 4 ]-
date_trunc | 2020-08-19 13:15:46
id | 1075
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR-RETURNED_SQLSTATE
jsonb_pretty | {
| "RETURNED_SQLSTATE": "22P02"
| }
-[ RECORD 5 ]-
date_trunc | 2020-08-19 13:15:46
id | 1076
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR-COLUMN_NAME
jsonb_pretty | {
| "COLUMN_NAME": ""
| }
-[ RECORD 6 ]-
date_trunc | 2020-08-19 13:15:46
id | 1077
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR-CONSTRAINT_NAME
jsonb_pretty | {
| "CONSTRAINT_NAME": ""
| }
-[ RECORD 7 ]-
date_trunc | 2020-08-19 13:15:46
id | 1078
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR-PG_DATATYPE_NAME
jsonb_pretty | {
| "PG_DATATYPE_NAME": ""
| }
-[ RECORD 8 ]-
date_trunc | 2020-08-19 13:15:46
id | 1079
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR-MESSAGE_TEXT
jsonb_pretty | {
| "MESSAGE_TEXT": "invalid input syntax for type numeric: "null""
| }
-[ RECORD 9 ]-
date_trunc | 2020-08-19 13:15:46
id | 1080
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR-SCHEMA_NAME
jsonb_pretty | {
| "SCHEMA_NAME": ""
| }
-[ RECORD 10 ]-
date_trunc | 2020-08-19 13:15:46
id | 1081
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR-PG_EXCEPTION_DETAIL
jsonb_pretty | {
| "PG_EXCEPTION_DETAIL": ""
| }
-[ RECORD 11 ]-
date_trunc | 2020-08-19 13:15:46
id | 1082
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR-PG_EXCEPTION_HINT
jsonb_pretty | {
| "PG_EXCEPTION_HINT": ""
| }
-[ RECORD 12 ]-
date_trunc | 2020-08-19 13:15:46
id | 1083
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR-PG_EXCEPTION_CONTEXT
jsonb_pretty | {
usename | emp1
log_module | addKD
log_module_hash | 0b4c1529a89af3ddf6af3821dc790e8a
status | ERROR-MESSAGE_TEXT
jsonb_pretty | {
| "MESSAGE_TEXT": "invalid input syntax for type numeric: "null""
| }
Sors: www.habr.com