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VALUE(1000000,9999999)); r3 NUMBER := CEIL(DBMS_RANDOM. VALUE(1000000,9999999)); r4 NUMBER := CEIL(DBMS_RANDOM. VALUE(1000000,9999999)); r5 NUMBER := CEIL(DBMS_RANDOM. VALUE(1000000,9999999)); BEGIN CASE tbl WHEN 0 THEN INSERT INTO scale_write_0 (id1, id2, id3, id4, id5) VALUES ( d1, r2, r3, r4, r5); WHEN 1 THEN INSERT INTO scale_write_1 (id1, id2, id3, id4, id5) VALUES ( d1, r2, r3, r4, r5); WHEN 2 THEN INSERT INTO scale_write_2 (id1, id2, id3, id4, id5) VALUES ( d1, r2, r3, r4, r5); WHEN 3 THEN INSERT INTO scale_write_3 (id1, id2, id3, id4, id5) VALUES ( d1, r2, r3, r4, r5); WHEN 4 THEN INSERT INTO scale_write_4 (id1, id2, id3, id4, id5) VALUES ( d1, r2, r3, r4, r5); WHEN 5 THEN INSERT INTO scale_write_5 (id1, id2, id3, id4, id5) VALUES ( d1, r2, r3, r4, r5); END CASE; RETURN 'insert'; END; FUNCTION run_delete(tbl IN NUMBER, d1 IN NUMBER) RETURN VARCHAR2 AS BEGIN CASE tbl WHEN 1 THEN DELETE FROM scale_write_1 WHERE id1 = d1; WHEN 2 THEN DELETE FROM scale_write_2 WHERE id1 = d1; WHEN 3 THEN DELETE FROM scale_write_3 WHERE id1 = d1; WHEN 4 THEN DELETE FROM scale_write_4 WHERE id1 = d1; WHEN 5 THEN DELETE FROM scale_write_5 WHERE id1 = d1; ELSE NULL; END CASE; IF SQL%ROWCOUNT 0 THEN RETURN 'delete'; ELSE RETURN NULL; END IF; END; FUNCTION run_update_all(tbl IN NUMBER, d1 IN NUMBER) RETURN VARCHAR2 AS r2 NUMBER := CEIL(DBMS_RANDOM.

VALUE(1000000,9999999)); r3 NUMBER := CEIL(DBMS_RANDOM. VALUE(1000000,9999999)); r4 NUMBER := CEIL(DBMS_RANDOM. VALUE(1000000,9999999)); r5 NUMBER := CEIL(DBMS_RANDOM. VALUE(1000000,9999999)); BEGIN CASE tbl WHEN 1 THEN UPDATE scale_write_1 SET id2 = r2, id3=r3, id4=r4, id5=r5 WHERE id1=d1; WHEN 2 THEN UPDATE scale_write_2 SET id2 = r2, id3=r3, id4=r4, id5=r5 WHERE id1=d1; WHEN 3 THEN UPDATE scale_write_3 SET id2 = r2, id3=r3, id4=r4, id5=r5 WHERE id1=d1; WHEN 4 THEN UPDATE scale_write_4 SET id2 = r2, id3=r3, id4=r4, id5=r5 WHERE id1=d1; WHEN 5 THEN UPDATE scale_write_5 SET id2 = r2, id3=r3, id4=r4, id5=r5 WHERE id1=d1; ELSE NULL; END CASE; IF SQL%ROWCOUNT 0 THEN RETURN 'update all'; ELSE RETURN NULL; END IF; END; FUNCTION run_update_one(tbl IN NUMBER, d1 IN NUMBER) RETURN VARCHAR2 AS r NUMBER := CEIL(DBMS_RANDOM. 5 LOOP strt := systimestamp; := CASE cmd WHEN 0 THEN run_update_all(tbl, r cmd*q) WHEN 1 THEN run_insert (tbl, r cmd*q) WHEN 2 THEN run_update_one(tbl, r cmd*q) WHEN 3 THEN run_delete (tbl, r cmd*q) END; IF IS NOT NULL THEN COMMIT; -- magic: convert INTERVAL DAYS TO SECONDS -- to NUMERIC (seconds) tmp := sysdate; rec.seconds := tmp (systimestamp - strt)*86400 - tmp; rec.idxes := tbl; rec.id1 := r cmd*q; PIPE ROW(rec); END IF; END LOOP; END LOOP; iter := iter - 1; END LOOP; COMMIT; RETURN; END run; END test_write_scalability; Markus Winand is the SQL Renaissance Ambassador.

It is used to re-create the trigger if it already exists.

It facilitates you to change the trigger definition without using a DROP TRIGGER statement.

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If a triggering statement omits a column list, the trigger is fired when any column of the associated table is updated.A database trigger is a stored procedure that automatically executes whenever an event occurs. Oracle initiates an ‘AFTER INSERT’ trigger after an insert event has been occurred and an ‘AFTER UPDATE’ trigger after an update event has been occurred.CREATE or REPLACE TRIGGER emp_after_insert AFTER INSERT ON emp FOR EACH ROW DECLARE BEGIN insert into emp_backup values (:new.empid, :new.fname, :new.lname); DBMS_OUTPUT.table_name: It specifies the name of the table on which trigger operation is being performed.CREATE OR REPLACE TRIGGER "SUPPLIERS_T2" AFTER insert or update or delete on "SUPPLIERS" for each row begin when the person performs insert/update/delete operations into the table.

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