Hi all, I am doing some changes in trigger firing mechanism (as a POC first, I will share my work if people find it useful and if it works).
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I am going to extend the trigger calls to child tables. So that in trigger
definition I can create triggers with CASCADED TRUE | FALSE option.
This will enable me to extend certain triggers to child tables and get over
the scenarios when a record gets inserted in child table and any *after
insert* triggers on parent tables never get fired.
I am right now trying to change pg_trigger and CreateTrigger function. I
have made changes in below files:
trigger.c:
- Added a New Variable cascadedOption (bool)
- Added a new statement in trigger.c to set the value:
values[Anum_pg_trigger_tgiscascaded - 1] =
BoolGetDatum(stmt->cascadedOption);
- Added a new column in CATALOG definition of pg_trigger in
pg_trigger.h
bool tgiscascaded;
- In pg_trigger.h, added a new position for values
#define Anum_pg_trigger_tgiscascaded 16
- Modified parsenode.h to add a new element in Structure for trigger
statement -CreateTrigStmt
bool cascadedOption;
CreateTrigStmt is passed to CreateTrigger function as an arguement. I am
struggling to understand how the values for various members of trigger are
set and where [which file] calls CreateTrigStmt.
Can someone provide some help on this?
Best Regards,
*Sameer Kumar | Database Consultant*
*ASHNIK PTE. LTD. *101 Cecil Street, #11-11 Tong Eng Building, Singapore
069533
M : *+65 8110 0350* T: +65 6438 3504 | www.ashnik.com
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