Oracle PL/SQL 6504 with BULK COLLECT - oracle

Question

I have this simple query:
SELECT MEASURE_ID, MEASURE_VALUE FROM MY_TABLE;
At the moment returning just a couple of records (in the future there will plenty of them):
8 265.7
7 559.6
A DESC on such table provides:
Name Null Type
------------ -------- ------------
MEASURE_ID NOT NULL NUMBER
MEASURE_VALUE NUMBER(10,1)
Then I defined the proper PL/SQL types:
CREATE OR REPLACE TYPE HASHMAP_NUM_TYPE_OBJ AS OBJECT (
THE_ID NUMBER,
THE_VALUE NUMBER(10,1)
);
CREATE OR REPLACE TYPE HASHMAP_NUM_TYPE IS TABLE OF HASHMAP_NUM_TYPE_OBJ;
And tried to fetch the records using a BULK COLLECT:
stats_by_measure HASHMAP_NUM_TYPE;
...
OPEN cursor_1 FOR
SELECT MEASURE_ID, MEASURE_VALUE
FROM MY_TABLE;
...
FETCH cursor_1 BULK COLLECT INTO stats_by_measure;
...
CLOSE cursor_1;
But I have the Oracle -6504 error. What am I doing wrong?
Remark: If I fetch the same cursor row by row, using a codeblock like this:
foo NUMBER;
faa NUMBER(10,1);
my_obj HASHMAP_NUM_TYPE_OBJ;
...
LOOP
FETCH cursor_1 INTO foo, faa;
my_obj := HASHMAP_NUM_TYPE_OBJ(foo,faa);
EXIT WHEN cursor_1%NOTFOUND;
END LOOP;
everything works fine!

Answer 1

modify your cursor query like below so that it will have the same type
OPEN cursor_1 FOR
SELECT HASHMAP_NUM_TYPE_OBJ(MEASURE_ID, MEASURE_VALUE)
FROM MY_TABLE;

Answer 2

You can only BULK COLLECT objects into a table of objects. In your case:
SQL> CREATE OR REPLACE TYPE hashmap_num_type_obj AS OBJECT (
2 the_id NUMBER,
3 the_value NUMBER(10,1)
4 );
5 /
Type created
SQL> CREATE OR REPLACE TYPE hashmap_num_type IS TABLE OF hashmap_num_type_obj;
2 /
Type created
SQL> DECLARE
2 l_tab hashmap_num_type;
3 BEGIN
4 SELECT hashmap_num_type_obj(measure_id, measure_value)
5 BULK COLLECT INTO l_tab
6 FROM my_table;
7 END;
8 /
PL/SQL procedure successfully completed

Answer 3

I've solve your question
declare
type REC_TYPE is record (
THE_ID number,
THE_VALUE number
);
type TB_TYPE is table of REC_TYPE index by binary_integer;
TBL TB_TYPE;
cursor CURSOR_1 is
select a1.MEASURE_ID A$1, a1.MEASURE_VALUE A$2
from MY_TABLE a1;
type REF_CUR_ is ref cursor return CURSOR_1%rowtype;
CURSOR_2 REF_CUR_;
begin
open CURSOR_2 for
select a1.MEASURE_ID A$1, a1.MEASURE_VALUE A$2
from MY_TABLE a1;
fetch CURSOR_2 bulk collect into TBL ;
close CURSOR_2;
return;
end;
It's works.
I have found another way without ref cursor there (look for FETCH Statement with BULK COLLECT Clause)

Answer 4

You should retrieve the rows into a type based on a record type rather than an object type. The following works;
DECLARE
TYPE hashmap_num_type_rt IS RECORD
(THE_ID NUMBER,
THE_VALUE NUMBER(10,1)
);
TYPE hashmap_num_type_t IS TABLE OF hashmap_num_type_rt;
stats_by_measure hashmap_num_type_t;
BEGIN
SELECT measure_id, measure_value
BULK COLLECT INTO stats_by_measure
FROM my_table;
FOR i IN 1..stats_by_measure.COUNT
LOOP
DBMS_OUTPUT.PUT_LINE('RECORD '||TO_CHAR(i)||' : ID - '||stats_by_measure(i).the_id||' MeasureVal: '||TO_CHAR(stats_by_measure(i).the_value));
END LOOP;
END;
You could also define a cursor and the create a table type based on the type of the cursor (which is of course is still a row type rather than an object type).
If you want to use a cursor as the row type then try the following;
DECLARE
CURSOR c_measures IS
SELECT measure_id, measure_value
FROM my_table;
TYPE hashmap_num_type_t IS TABLE OF c_measures%ROWTYPE;
stats_by_measure hashmap_num_type_t;
BEGIN
OPEN c_measures;
FETCH c_measures
BULK COLLECT INTO stats_by_measure;
CLOSE c_measures;
FOR i IN 1..stats_by_measure.COUNT
LOOP
DBMS_OUTPUT.PUT_LINE('RECORD '||TO_CHAR(i)||' : ID - '||stats_by_measure(i).measure_id||' MeasureVal: '||TO_CHAR(stats_by_measure(i).measure_value));
END LOOP;
END;