Trigger updating inserting
Since changes to triggers don't imply structural changes to the table itself, Firebird no longer increments the table change counter when In Firebird 2.0 only, a restriction is in place which prevents anyone from dropping, altering or recreating a trigger or stored procedure if it has been used since the database was opened.
In Firebird 2.0 only, a restriction is in place which prevents anyone from dropping, altering or recreating a trigger or stored procedure if it has been used since the database was opened.
Inside the Trigger, I have added a condition that if record has Customer Id value 2 then such a record must not be deleted and an error must be raised.
Also a record is inserted in the Customer Logs table.
Everything I have seen mentions that an Insert trigger can not modify the data that has just been inserted. For example: Table has 3 fields: My Table: ID (int, Identity), Integer1(int), Integer2(int) INSERT INTO My Table (Integer1) VALUES (20) And then on the trigger have the Integer2 column be set to Integer1 10.
Everything I have seen mentions that an Insert trigger can notmodify the data that has just been inserted.
Now, we will insert a record in employee table, and we will have the same record in employee_backup table because we have created an AFTER INSERT trigger on employee table.The INSERTEDtable is a special table which keeps only the rows which are inserted; therefore, we are using this INSERTED table to keep both tables in sync.We are inserting the rows from INSERTED table which is populated with insert statements made on employee table into employee_backup table. An Insert trigger will be executed here, and the same record will be inserted into employee_backup table */ INSERT INTO EMPLOYEE (EMPID, FNAME, LNAME) VALUES (504, 'Vish', 'Dalvi') Vishwanath Dalvi is a gifted engineer and tech enthusiast. When not hacking around or supporting the open source community, he is trying to overcome his phobia of dogs.Once that counter reaches 255, no more metadata changes are possible on the table (you can still work with the data though).A backup-restore cycle is needed to reset the counter and perform metadata operations again.