Cov txheej txheem:
Video: Dab tsi yog qhov apex trigger?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Apex ua rau pab kom koj ua kev cai ua ua ntej lossis tom qab hloov pauv rau Salesforce cov ntaub ntawv, xws li kev ntxig, hloov tshiab, lossis tshem tawm. A ua rau yog Apex code uas executes ua ntej los yog tom qab cov nram qab no hom kev khiav hauj lwm: ntxig. hloov tshiab. rho tawm.
Hauv txoj kev no, Salesforce Apex yog dab tsi?
Apex ua rau pab kom koj ua cov kev cai ua ua ntej lossis tom qab cov xwm txheej los sau rau hauv Salesforce , xws li ntxig, hloov tshiab, lossis tshem tawm. Ua rau tuaj yeem txhais tau rau cov khoom siv qib siab tshaj plaws, xws li Account lossis Tiv tauj, cov khoom siv, thiab qee yam khoom siv me nyuam. Ua rau yog active los ntawm lub neej ntawd thaum tsim.
Tom qab ntawd, lo lus nug yog, dab tsi yog ob txoj kev xaiv rau thaum Apex triggers tuaj yeem khiav? Apex Triggers tuaj yeem ua tau los yog khiav ua ntej cov ntaub ntawv tau txais kev cawmdim tom qab. Ib qho ua ntej ua haujlwm feem ntau yog siv los txheeb xyuas cov ntaub ntawv uas yuav muab tso rau, thiab tom qab ua rau yog siv los nkag tau cov ntaub ntawv uas yav tas los tau nkag los ntawm tus neeg siv lossis qhov system.
Tsuas yog li ntawd, koj sau Apex txhais li cas?
Tsim ib qho Apex Trigger
- Los ntawm kev teeb tsa, xaiv Customize thiab tom qab ntawd nyem qhov khoom uas koj xav ntxiv qhov ua rau.
- Nyem Triggers thiab ces nias Tshiab.
- Txhawm rau txheeb xyuas koj qhov tshwm sim, nkag mus rau Apex code zoo ib yam li cov qauv no.
- Nco ntsoov tias Is Active raug xaiv.
- Nyem Txuag.
Dab tsi yog qhov sib txawv ntawm ua ntej thiab tom qab ua tiav?
Ua ntej ua yog siv los hloov kho lossis validate cov ntaub ntawv muaj nuj nqis ua ntej lawv nyob nraum khaws cia rau hauv lub database. Tom qab ua yog siv los nkag mus rau cov nqi teb uas tau teeb tsa los ntawm lub kaw lus (xws li cov ntaub ntawv ID lossis LastModifiedDate teb), thiab ua rau muaj kev hloov pauv hauv lwm cov ntaub ntawv. Cov ntaub ntawv uas tua hluav taws tom qab trigger nyeem nkaus xwb.
Pom zoo:
Dab tsi yog qhov dav thawj qhov kev tshawb nrhiav thiab qhov tob thawj qhov kev tshawb fawb?
BFS sawv rau Breadth First Search. DFS sawv cev rau Kev Tshawb Nrhiav Qhov tob. 2. BFS (Breadth First Search) siv Queue cov qauv ntaub ntawv los nrhiav txoj hauv kev luv tshaj. BFS tuaj yeem siv los nrhiav ib qhov chaw luv tshaj plaws hauv cov duab tsis hnyav, vim tias hauv BFS, peb mus txog qhov kawg uas muaj qhov tsawg kawg nkaus ntawm cov npoo los ntawm qhov chaw vertex
Dab tsi yog sparse kem Dab tsi yog qhov zoo thiab qhov tsis zoo?
Koj poob 4 bytes tsis yog ib zaug ib kab; tab sis rau txhua lub cell hauv kab uas tsis yog null. Qhov zoo ntawm SPARSE kem yog: Qhov tsis zoo ntawm SPARSE kem yog: SPARSE kem tsis tuaj yeem siv rau ntawm cov ntawv, ntext, duab, timestamp, geometry, geography lossis cov neeg siv cov ntaub ntawv teev tseg
Dab tsi yog qhov qub txeeg qub teg Dab tsi yog qhov sib txawv ntawm qhov qub txeeg qub teg piav nrog piv txwv?
Inheritance yog ib txoj hauv kev kom tau txais cov yam ntxwv thiab kev coj cwj pwm ntawm ib chav kawm los ntawm lwm chav kawm. Cov chav kawm uas cov tswv cuab tau txais qub txeeg qub teg yog hu ua chav kawm hauv paus, thiab chav kawm uas tau txais cov tswv cuab tam sim no hu ua chav derived. Inheritance siv IS-A kev sib raug zoo
Dab tsi yog qhov zoo sib xws thiab qhov txawv ntawm relays thiab PLC yog dab tsi?
Relays yog electro-mechanical keyboards uas muaj coil thiab ob hom kev sib cuag uas tsis yog NO & NC. Tab sis Programmable Logic Controller, PLC yog lub khoos phis tawj me uas tuaj yeem txiav txim siab raws li qhov kev zov me nyuam thiab nws cov tswv yim & tso tawm
Dab tsi yog qhov sib txawv ntawm qhov ntsuas qhov ntsuas thiab qhov ntsuas thib ob?
Primary index: nyob rau hauv ib tug sequentially order file, qhov Performance index uas nws search key qhia cov sequential order ntawm cov ntaub ntawv. Kuj hu ua clustering index. Secondary index: ib qho Performance index uas nws qhov tseem ceeb tshawb nrhiav qhia qhov kev txiav txim sib txawv ntawm qhov kev txiav txim ntawm cov ntaub ntawv. Kuj hu ua non-clustering index