How to create the constructor function for a pl/sql table?

I created a PL/SQL type as table below:

create or replace type typ_tbl_des_text is table of the typ_tof_des_text

OK so far, but I would like to have a constructor function which would be subject to validations and raise_application_error when a validation condition is not met.

How to do this?

The typ_tof_des_text that I created with a constructor function, so that the record-level validation are performed in the constructor. And I think the postings between several records shall be made in a constructor for typ_tbl_des_tex, but cannot figure out how to create such a constructor.

BEDE wrote:

So, if I have understood correctly, to a plsql table type, I can't have a member procedure. Or can I? I mean, just as for a type of failure I can have one or more constructors and possibly several procedures of Member.

For the standard tables in PL/SQL, you will need to create your own API (using procedures and functions) to handle beyond the basics provided by the language. No constructors and methods as it is no o - o.

After thinking a little deeper, I reformulate what I said earlier and actually wants to have a member procedure called add_item, who would be first to check if an item with a key value exists and, if so, it would be up-to-date and so not only extend the plsql table.

Two options.

As we already mentioned, an associative array can be considered - note however that this structure of table has name-value pairs.

Another method is to use a TWG (global temporary table). You define the structure of the once initial table. When a session uses the structure of the table, private copying is instantiated for this session. When the session ends, this copy is destroyed. The table is a temporary structure for this session only.

It can include indexes and so on – which means you can use the constraints of primary keys, unique indexes, secondary indexes and so on.

TWG scales are much better than collections or arrays that require a PGA (expensive private server) memory. In addition, SQL can be used natively against a GTT - unlike the arrays and collections.

Tags: Database

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