I am trying to define a type
using the following code.
CREATE OR REPLACE TYPE MY_TYPE AS OBJECT (
app_id some_table_name.app_id%type
);
If I run this, I get the error.
Error(4,32): PLS-00201: identifier 'some_table_name.app_id' must be declared
What is wrong with this?
Defining TABLE Types. TYPE table_type_name IS TABLE OF datatype [NOT NULL] INDEX BY BINARY_INTEGER; where table_type_name is a type specifier used in subsequent declarations of PL/SQL tables. The INDEX BY clause must specify datatype BINARY_INTEGER, which has a magnitude range of -2147483647 ..
The %TYPE attribute provides the datatype of a variable or table column. This is particularly useful when declaring variables that will hold values of a table column. For example, suppose you want to declare variables as the same datatype as the employee_id and last_name columns in employees table.
The phone_varray_typ VARRAY type is used as a data type for a column in the dept_phone_list table.
Also, if you have Toad for Oracle, you can highlight the statement and press CTRL + F9 and you'll get a nice view of column and their datatypes.
What's wrong with it is that %type
is PL/SQL syntax. It isn't supported in SQL. Now we use PL/SQL to define Types (especially member functions, constructors, etc) but the Types themselves are SQL objects, and so follow SQL rules. That means we must declare Type attributes with explicit datatypes.
I agree that's a shame, and it would be really neat if we could reference table columns in type declarations like this. Unfortunately Oracle have really slowed down the changes to their TYPE implementation over the last couple of versions, so I think it is unlikely this will change in the near future.
What I would really like to see is Oracle support this syntax:
CREATE OR REPLACE TYPE MY_TYPE AS OBJECT
( one_row some_table_name.%rowtype );
Dynamic objects for interfaces: how cool would that be?
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