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Diffstat (limited to 'src/pl/tcl/sql/pltcl_trigger.sql')
| -rw-r--r-- | src/pl/tcl/sql/pltcl_trigger.sql | 603 |
1 files changed, 603 insertions, 0 deletions
diff --git a/src/pl/tcl/sql/pltcl_trigger.sql b/src/pl/tcl/sql/pltcl_trigger.sql new file mode 100644 index 0000000..2db75a3 --- /dev/null +++ b/src/pl/tcl/sql/pltcl_trigger.sql @@ -0,0 +1,603 @@ +-- suppress CONTEXT so that function OIDs aren't in output +\set VERBOSITY terse + +-- +-- Create the tables used in the test queries +-- +-- T_pkey1 is the primary key table for T_dta1. Entries from T_pkey1 +-- Cannot be changed or deleted if they are referenced from T_dta1. +-- +-- T_pkey2 is the primary key table for T_dta2. If the key values in +-- T_pkey2 are changed, the references in T_dta2 follow. If entries +-- are deleted, the referencing entries from T_dta2 are deleted too. +-- The values for field key2 in T_pkey2 are silently converted to +-- upper case on insert/update. +-- +create table T_pkey1 ( + key1 int4, + key2 char(20), + txt char(40) +); + +create table T_pkey2 ( + key1 int4, + key2 char(20), + txt char(40) +); + +create table T_dta1 ( + tkey char(10), + ref1 int4, + ref2 char(20) +); + +create table T_dta2 ( + tkey char(10), + ref1 int4, + ref2 char(20) +); + + +-- +-- Function to check key existence in T_pkey1 +-- +create function check_pkey1_exists(int4, bpchar) returns bool as E' + if {![info exists GD]} { + set GD(plan) [spi_prepare \\ + "select 1 from T_pkey1 \\ + where key1 = \\$1 and key2 = \\$2" \\ + {int4 bpchar}] + } + + set n [spi_execp -count 1 $GD(plan) [list $1 $2]] + + if {$n > 0} { + return "t" + } + return "f" +' language pltcl; + + +-- dump trigger data + +CREATE TABLE trigger_test ( + i int, + v text, + dropme text, + test_skip boolean DEFAULT false, + test_return_null boolean DEFAULT false, + test_argisnull boolean DEFAULT false +); +-- Make certain dropped attributes are handled correctly +ALTER TABLE trigger_test DROP dropme; + +CREATE TABLE trigger_test_generated ( + i int, + j int GENERATED ALWAYS AS (i * 2) STORED +); + +CREATE VIEW trigger_test_view AS SELECT i, v FROM trigger_test; + +CREATE FUNCTION trigger_data() returns trigger language pltcl as $_$ + if {$TG_table_name eq "trigger_test" && $TG_level eq "ROW" && $TG_op ne "DELETE"} { + # Special case tests + if {$NEW(test_return_null) eq "t" } { + return_null + } + if {$NEW(test_argisnull) eq "t" } { + set should_error [argisnull 1] + } + if {$NEW(test_skip) eq "t" } { + elog NOTICE "SKIPPING OPERATION $TG_op" + return SKIP + } + } + + if { [info exists TG_relid] } { + set TG_relid "bogus:12345" + } + + set dnames [info locals {[a-zA-Z]*} ] + + foreach key [lsort $dnames] { + + if { [array exists $key] } { + set str "{" + foreach akey [lsort [ array names $key ] ] { + if {[string length $str] > 1} { set str "$str, " } + set cmd "($akey)" + set cmd "set val \$$key$cmd" + eval $cmd + set str "$str$akey: $val" + } + set str "$str}" + elog NOTICE "$key: $str" + } else { + set val [eval list "\$$key" ] + elog NOTICE "$key: $val" + } + } + + + return OK + +$_$; + +CREATE TRIGGER show_trigger_data_trig +BEFORE INSERT OR UPDATE OR DELETE ON trigger_test +FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo'); +CREATE TRIGGER statement_trigger +BEFORE INSERT OR UPDATE OR DELETE OR TRUNCATE ON trigger_test +FOR EACH STATEMENT EXECUTE PROCEDURE trigger_data(42,'statement trigger'); + +CREATE TRIGGER show_trigger_data_trig_before +BEFORE INSERT OR UPDATE OR DELETE ON trigger_test_generated +FOR EACH ROW EXECUTE PROCEDURE trigger_data(); +CREATE TRIGGER show_trigger_data_trig_after +AFTER INSERT OR UPDATE OR DELETE ON trigger_test_generated +FOR EACH ROW EXECUTE PROCEDURE trigger_data(); + +CREATE TRIGGER show_trigger_data_view_trig +INSTEAD OF INSERT OR UPDATE OR DELETE ON trigger_test_view +FOR EACH ROW EXECUTE PROCEDURE trigger_data(24,'skidoo view'); + +-- +-- Trigger function on every change to T_pkey1 +-- +create function trig_pkey1_before() returns trigger as E' + # + # Create prepared plans on the first call + # + if {![info exists GD]} { + # + # Plan to check for duplicate key in T_pkey1 + # + set GD(plan_pkey1) [spi_prepare \\ + "select check_pkey1_exists(\\$1, \\$2) as ret" \\ + {int4 bpchar}] + # + # Plan to check for references from T_dta1 + # + set GD(plan_dta1) [spi_prepare \\ + "select 1 from T_dta1 \\ + where ref1 = \\$1 and ref2 = \\$2" \\ + {int4 bpchar}] + } + + # + # Initialize flags + # + set check_old_ref 0 + set check_new_dup 0 + + switch $TG_op { + INSERT { + # + # Must check for duplicate key on INSERT + # + set check_new_dup 1 + } + UPDATE { + # + # Must check for duplicate key on UPDATE only if + # the key changes. In that case we must check for + # references to OLD values too. + # + if {[string compare $NEW(key1) $OLD(key1)] != 0} { + set check_old_ref 1 + set check_new_dup 1 + } + if {[string compare $NEW(key2) $OLD(key2)] != 0} { + set check_old_ref 1 + set check_new_dup 1 + } + } + DELETE { + # + # Must only check for references to OLD on DELETE + # + set check_old_ref 1 + } + } + + if {$check_new_dup} { + # + # Check for duplicate key + # + spi_execp -count 1 $GD(plan_pkey1) [list $NEW(key1) $NEW(key2)] + if {$ret == "t"} { + elog ERROR \\ + "duplicate key ''$NEW(key1)'', ''$NEW(key2)'' for T_pkey1" + } + } + + if {$check_old_ref} { + # + # Check for references to OLD + # + set n [spi_execp -count 1 $GD(plan_dta1) [list $OLD(key1) $OLD(key2)]] + if {$n > 0} { + elog ERROR \\ + "key ''$OLD(key1)'', ''$OLD(key2)'' referenced by T_dta1" + } + } + + # + # Anything is fine - let operation pass through + # + return OK +' language pltcl; + + +create trigger pkey1_before before insert or update or delete on T_pkey1 + for each row execute procedure + trig_pkey1_before(); + + +-- +-- Trigger function to check for duplicate keys in T_pkey2 +-- and to force key2 to be upper case only without leading whitespaces +-- +create function trig_pkey2_before() returns trigger as E' + # + # Prepare plan on first call + # + if {![info exists GD]} { + set GD(plan_pkey2) [spi_prepare \\ + "select 1 from T_pkey2 \\ + where key1 = \\$1 and key2 = \\$2" \\ + {int4 bpchar}] + } + + # + # Convert key2 value + # + set NEW(key2) [string toupper [string trim $NEW(key2)]] + + # + # Check for duplicate key + # + set n [spi_execp -count 1 $GD(plan_pkey2) [list $NEW(key1) $NEW(key2)]] + if {$n > 0} { + elog ERROR \\ + "duplicate key ''$NEW(key1)'', ''$NEW(key2)'' for T_pkey2" + } + + # + # Return modified tuple in NEW + # + return [array get NEW] +' language pltcl; + + +create trigger pkey2_before before insert or update on T_pkey2 + for each row execute procedure + trig_pkey2_before(); + + +-- +-- Trigger function to force references from T_dta2 follow changes +-- in T_pkey2 or be deleted too. This must be done AFTER the changes +-- in T_pkey2 are done so the trigger for primkey check on T_dta2 +-- fired on our updates will see the new key values in T_pkey2. +-- +create function trig_pkey2_after() returns trigger as E' + # + # Prepare plans on first call + # + if {![info exists GD]} { + # + # Plan to update references from T_dta2 + # + set GD(plan_dta2_upd) [spi_prepare \\ + "update T_dta2 set ref1 = \\$3, ref2 = \\$4 \\ + where ref1 = \\$1 and ref2 = \\$2" \\ + {int4 bpchar int4 bpchar}] + # + # Plan to delete references from T_dta2 + # + set GD(plan_dta2_del) [spi_prepare \\ + "delete from T_dta2 \\ + where ref1 = \\$1 and ref2 = \\$2" \\ + {int4 bpchar}] + } + + # + # Initialize flags + # + set old_ref_follow 0 + set old_ref_delete 0 + + switch $TG_op { + UPDATE { + # + # On update we must let old references follow + # + set NEW(key2) [string toupper $NEW(key2)] + + if {[string compare $NEW(key1) $OLD(key1)] != 0} { + set old_ref_follow 1 + } + if {[string compare $NEW(key2) $OLD(key2)] != 0} { + set old_ref_follow 1 + } + } + DELETE { + # + # On delete we must delete references too + # + set old_ref_delete 1 + } + } + + if {$old_ref_follow} { + # + # Let old references follow and fire NOTICE message if + # there where some + # + set n [spi_execp $GD(plan_dta2_upd) \\ + [list $OLD(key1) $OLD(key2) $NEW(key1) $NEW(key2)]] + if {$n > 0} { + elog NOTICE \\ + "updated $n entries in T_dta2 for new key in T_pkey2" + } + } + + if {$old_ref_delete} { + # + # delete references and fire NOTICE message if + # there where some + # + set n [spi_execp $GD(plan_dta2_del) \\ + [list $OLD(key1) $OLD(key2)]] + if {$n > 0} { + elog NOTICE \\ + "deleted $n entries from T_dta2" + } + } + + return OK +' language pltcl; + + +create trigger pkey2_after after update or delete on T_pkey2 + for each row execute procedure + trig_pkey2_after(); + + +-- +-- Generic trigger function to check references in T_dta1 and T_dta2 +-- +create function check_primkey() returns trigger as E' + # + # For every trigger/relation pair we create + # a saved plan and hold them in GD + # + set plankey [list "plan" $TG_name $TG_relid] + set planrel [list "relname" $TG_relid] + + # + # Extract the pkey relation name + # + set keyidx [expr [llength $args] / 2] + set keyrel [string tolower [lindex $args $keyidx]] + + if {![info exists GD($plankey)]} { + # + # We must prepare a new plan. Build up a query string + # for the primary key check. + # + set keylist [lrange $args [expr $keyidx + 1] end] + + set query "select 1 from $keyrel" + set qual " where" + set typlist "" + set idx 1 + foreach key $keylist { + set key [string tolower $key] + # + # Add the qual part to the query string + # + append query "$qual $key = \\$$idx" + set qual " and" + + # + # Lookup the fields type in pg_attribute + # + set n [spi_exec "select T.typname \\ + from pg_catalog.pg_type T, pg_catalog.pg_attribute A, pg_catalog.pg_class C \\ + where C.relname = ''[quote $keyrel]'' \\ + and C.oid = A.attrelid \\ + and A.attname = ''[quote $key]'' \\ + and A.atttypid = T.oid"] + if {$n != 1} { + elog ERROR "table $keyrel doesn''t have a field named $key" + } + + # + # Append the fields type to the argument type list + # + lappend typlist $typname + incr idx + } + + # + # Prepare the plan + # + set GD($plankey) [spi_prepare $query $typlist] + + # + # Lookup and remember the table name for later error messages + # + spi_exec "select relname from pg_catalog.pg_class \\ + where oid = ''$TG_relid''::oid" + set GD($planrel) $relname + } + + # + # Build the argument list from the NEW row + # + incr keyidx -1 + set arglist "" + foreach arg [lrange $args 0 $keyidx] { + lappend arglist $NEW($arg) + } + + # + # Check for the primary key + # + set n [spi_execp -count 1 $GD($plankey) $arglist] + if {$n <= 0} { + elog ERROR "key for $GD($planrel) not in $keyrel" + } + + # + # Anything is fine + # + return OK +' language pltcl; + + +create trigger dta1_before before insert or update on T_dta1 + for each row execute procedure + check_primkey('ref1', 'ref2', 'T_pkey1', 'key1', 'key2'); + + +create trigger dta2_before before insert or update on T_dta2 + for each row execute procedure + check_primkey('ref1', 'ref2', 'T_pkey2', 'key1', 'key2'); + + +insert into T_pkey1 values (1, 'key1-1', 'test key'); +insert into T_pkey1 values (1, 'key1-2', 'test key'); +insert into T_pkey1 values (1, 'key1-3', 'test key'); +insert into T_pkey1 values (2, 'key2-1', 'test key'); +insert into T_pkey1 values (2, 'key2-2', 'test key'); +insert into T_pkey1 values (2, 'key2-3', 'test key'); + +insert into T_pkey2 values (1, 'key1-1', 'test key'); +insert into T_pkey2 values (1, 'key1-2', 'test key'); +insert into T_pkey2 values (1, 'key1-3', 'test key'); +insert into T_pkey2 values (2, 'key2-1', 'test key'); +insert into T_pkey2 values (2, 'key2-2', 'test key'); +insert into T_pkey2 values (2, 'key2-3', 'test key'); + +select * from T_pkey1; + +-- key2 in T_pkey2 should have upper case only +select * from T_pkey2; + +insert into T_pkey1 values (1, 'KEY1-3', 'should work'); + +-- Due to the upper case translation in trigger this must fail +insert into T_pkey2 values (1, 'KEY1-3', 'should fail'); + +insert into T_dta1 values ('trec 1', 1, 'key1-1'); +insert into T_dta1 values ('trec 2', 1, 'key1-2'); +insert into T_dta1 values ('trec 3', 1, 'key1-3'); + +-- Must fail due to unknown key in T_pkey1 +insert into T_dta1 values ('trec 4', 1, 'key1-4'); + +insert into T_dta2 values ('trec 1', 1, 'KEY1-1'); +insert into T_dta2 values ('trec 2', 1, 'KEY1-2'); +insert into T_dta2 values ('trec 3', 1, 'KEY1-3'); + +-- Must fail due to unknown key in T_pkey2 +insert into T_dta2 values ('trec 4', 1, 'KEY1-4'); + +select * from T_dta1; + +select * from T_dta2; + +update T_pkey1 set key2 = 'key2-9' where key1 = 2 and key2 = 'key2-1'; +update T_pkey1 set key2 = 'key1-9' where key1 = 1 and key2 = 'key1-1'; +delete from T_pkey1 where key1 = 2 and key2 = 'key2-2'; +delete from T_pkey1 where key1 = 1 and key2 = 'key1-2'; + +update T_pkey2 set key2 = 'KEY2-9' where key1 = 2 and key2 = 'KEY2-1'; +update T_pkey2 set key2 = 'KEY1-9' where key1 = 1 and key2 = 'KEY1-1'; +delete from T_pkey2 where key1 = 2 and key2 = 'KEY2-2'; +delete from T_pkey2 where key1 = 1 and key2 = 'KEY1-2'; + +select * from T_pkey1; +select * from T_pkey2; +select * from T_dta1; +select * from T_dta2; + +select tcl_avg(key1) from T_pkey1; +select tcl_sum(key1) from T_pkey1; +select tcl_avg(key1) from T_pkey2; +select tcl_sum(key1) from T_pkey2; + +-- The following should return NULL instead of 0 +select tcl_avg(key1) from T_pkey1 where key1 = 99; +select tcl_sum(key1) from T_pkey1 where key1 = 99; + +select 1 @< 2; +select 100 @< 4; + +select * from T_pkey1 order by key1 using @<, key2 collate "C"; +select * from T_pkey2 order by key1 using @<, key2 collate "C"; + +-- show dump of trigger data +insert into trigger_test values(1,'insert'); + +insert into trigger_test_generated (i) values (1); +update trigger_test_generated set i = 11 where i = 1; +delete from trigger_test_generated; + +insert into trigger_test_view values(2,'insert'); +update trigger_test_view set v = 'update' where i=1; +delete from trigger_test_view; + +update trigger_test set v = 'update', test_skip=true where i = 1; +update trigger_test set v = 'update' where i = 1; +delete from trigger_test; +truncate trigger_test; + +DROP TRIGGER show_trigger_data_trig_before ON trigger_test_generated; +DROP TRIGGER show_trigger_data_trig_after ON trigger_test_generated; + +-- should error +insert into trigger_test(test_argisnull) values(true); + +-- should error +insert into trigger_test(test_return_null) values(true); + +-- test transition table visibility +create table transition_table_test (id int, name text); +insert into transition_table_test values (1, 'a'); +create function transition_table_test_f() returns trigger language pltcl as +$$ + spi_exec -array C "SELECT id, name FROM old_table" { + elog INFO "old: $C(id) -> $C(name)" + } + spi_exec -array C "SELECT id, name FROM new_table" { + elog INFO "new: $C(id) -> $C(name)" + } + return OK +$$; +CREATE TRIGGER a_t AFTER UPDATE ON transition_table_test + REFERENCING OLD TABLE AS old_table NEW TABLE AS new_table + FOR EACH STATEMENT EXECUTE PROCEDURE transition_table_test_f(); +update transition_table_test set name = 'b'; +drop table transition_table_test; +drop function transition_table_test_f(); + +-- dealing with generated columns + +CREATE FUNCTION generated_test_func1() RETURNS trigger +LANGUAGE pltcl +AS $$ +# not allowed +set NEW(j) 5 +return [array get NEW] +$$; + +CREATE TRIGGER generated_test_trigger1 BEFORE INSERT ON trigger_test_generated +FOR EACH ROW EXECUTE PROCEDURE generated_test_func1(); + +TRUNCATE trigger_test_generated; +INSERT INTO trigger_test_generated (i) VALUES (1); +SELECT * FROM trigger_test_generated; |