How to get a row object from a function that return a table object in plsql? - plsql

Question

i'm trying to get a single row and save it into a variable in PLSQL.
I'm using APEX and all is around the APEX_DATA_PARSE.PARSE() function.
As the docs said, .PARSE() should return WWV_FLOW_T_PARSER_ROW for every row of results.
What i'm trying to do is to get only one row to be saved into a variable.
This is My code:
`
DECLARE
r_columns_headers WWV_FLOW_T_PARSER_ROW; --object
BEGIN
DBMS_OUTPUT.ENABLE;
BEGIN
<<populate_headers>>
select * into r_columns_headers
from apex_application_temp_files f,
table( apex_data_parser.parse(
p_content => f.blob_content,
p_add_headers_row => 'Y',
P_SKIP_ROWS => 1,
p_max_rows => 500,
p_store_profile_to_collection => 'FILE_PARSER_COLLECTION',
p_file_name => f.filename ) ) p
where f.name = '43300947378776117/DATALOAD_Test_data_main_v032.xlsx' and p.line_number = 2;
end populate_headers;
DBMS_OUTPUT.PUT_LINE(r_columns_headers.id);
end;
`
is just for test outside the main package that i'm writing.
The error i get is PL/SQL: ORA-00947 on row 8, on the select * into r_columns_headers section.
I don't know why i get not enough values, the fields are the same as they are the same type of object. The select return exactly one row, of a WWV_FLOW_T_PARSER_TABLE object. Not all columns are with data, someones are null, is this the problem?
I'm just at the beginning of learning plsql.
Thanks a lot
wwv_flow_t_parser_row
I'm trying to get a row into the r_columns_headers variable to access it in my program.

Answer 1

The "ORA-00947: not enough values" error is sometimes a bit confusing; in a PL/SQL context it can be backwards.
The problem is that you actually have too many values in your select list. You are doing:
select * into r_columns_headers
but you're joining two table expression, apex_application_temp_files as f and the unnested table as p. So the * is effectively doing:
select f.*, p.* into r_columns_headers
... and that object doesn't have fields for all the columns coming from f.
So you need to restrict it to the relevant data:
select p.* into r_columns_headers
... but that returns all of the object attributes as individual columns, not as a single object; but you can get the actual object with the value() function:
select value(p) into r_columns_headers
fiddle with a dummy object type and data as the real APEX types aren't available there.