Store data from table into object table - sql

Question

How would you go about transferring data into an object table?
Say you have a table:
create table thisTable(
column1 varchar2(20),
column2 varchar2(20),
column3 varchar2(20)
)
/
And you have a new object table:
create table oo_thisTable(
object1 object1_t
)
/
create type object1_t as object (
column1 varchar2(20),
column2 varchar2(20),
column3 varchar2(20)
)
/
How would you transfer the data from thisTable to oo_thisTable?
declare
cursor c1 is
select * from thisTable;
begin
open c1;
loop
fetch c1 into column1, column2, column3;
exit when c1%notfound;
...

Answer 1

No need of using PL/SQL, you could do it in pure SQL.
INSERT INTO oo_thistable SELECT object1_t(column1, column2, column3) FROM thistable;
Demo
Create the required type and tables:
SQL> create table thisTable(
2 column1 varchar2(20),
3 column2 varchar2(20),
4 column3 varchar2(20)
5 )
6 /
Table created.
SQL> create type object1_t as object (
2 column1 varchar2(20),
3 column2 varchar2(20),
4 column3 varchar2(20)
5 )
6 /
Type created.
SQL> create table oo_thisTable(
2 object1 object1_t
3 )
4 /
Table created.
Insert few rows in thistable:
SQL> INSERT INTO thistable VALUES('a','b','c');
1 row created.
SQL> INSERT INTO thistable VALUES('d','e','f');
1 row created.
SQL> INSERT INTO thistable VALUES('g','h','i');
1 row created.
Now we want to insert all rows from thistable into oo_thistable:
SQL> INSERT INTO oo_thistable SELECT object1_t(column1, column2, column3) FROM thistable;
3 rows created.
Validate:
SQL> SELECT * FROM oo_thistable;
OBJECT1(COLUMN1, COLUMN2, COLUMN3)
--------------------------------------------------------------------------------
OBJECT1_T('a', 'b', 'c')
OBJECT1_T('d', 'e', 'f')
OBJECT1_T('g', 'h', 'i')
You have all the rows inserted.

Answer 2

INSERT INTO oo_thisTable (object1) SELECT object1_t(column1, column2, column3) FROM thisTable;
For better readability you can use keyword NEW to show explicitly that you invoke type constructor not just some fuction.
INSERT INTO oo_thisTable (object1) SELECT new object1_t(column1, column2, column3) FROM thisTable;

Answer 3

I have written some sequential steps for the issue described. Please try this and let me know if this helps.
SQL> set sqlbl on;
SQL> set define off;
SQL> set timing on;
SQL> DROP TYPE TEST_TAB;
Type dropped.
Elapsed: 00:00:00.90
SQL>
SQL> DROP TYPE Test_oo;
Type dropped.
Elapsed: 00:00:00.58
SQL> CREATE OR REPLACE type Test_oo
2 IS
3 OBJECT
4 (
5 col1 NUMBER,
6 COL2 VARCHAR2(100 CHAR),
7 COL3 TIMESTAMP
8 );
9 /
Type created.
Elapsed: 00:00:00.21
SQL> CREATE OR REPLACE TYPE TEST_TAB IS TABLE OF TEST_OO;
2 /
Type created.
Elapsed: 00:00:00.20
SQL> DROP TABLE TEST_TABLE;
Table dropped.
Elapsed: 00:00:00.39
SQL> CREATE TABLE TEST_TABLE
2 (
3 O_col1 NUMBER,
4 O_COL2 VARCHAR2(100 CHAR),
5 O_COL3 TIMESTAMP
6 );
Table created.
Elapsed: 00:00:00.28
SQL> INSERT INTO TEST_TABLE
2 SELECT LEVEL,LEVEL||'AV',SYSDATE+LEVEL
3 FROM DUAL
4 CONNECT BY LEVEL < 10;
9 rows created.
Elapsed: 00:00:00.11
SQL>
SQL> COMMIT;
Commit complete.
Elapsed: 00:00:00.10
SQL> DECLARE
2 lv_obj TEST_TAB;
3 BEGIN
4 dbms_output.put_line('test');
5 SELECT test_oo(T1.O_COL1,T1.O_COL2,T1.O_COL3) bulk collect
6 INTO lv_obj
7 FROM test_table t1;
8 FOR I IN LV_OBJ.FIRST..LV_OBJ.LAST
9 LOOP
10 dbms_output.put_line(LV_OBJ(I).COL1||' '||LV_OBJ(I).COL2||' '||LV_OBJ(I).COL3);
11 END LOOP;
12 END;
13 /
test
1 1AV 18-NOV-15 02.04.29.000000 AM
2 2AV 19-NOV-15 02.04.29.000000 AM
3 3AV 20-NOV-15 02.04.29.000000 AM
4 4AV 21-NOV-15 02.04.29.000000 AM
5 5AV 22-NOV-15 02.04.29.000000 AM
6 6AV 23-NOV-15 02.04.29.000000 AM
7 7AV 24-NOV-15 02.04.29.000000 AM
8 8AV 25-NOV-15 02.04.29.000000 AM
9 9AV 26-NOV-15 02.04.29.000000 AM
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.12
SQL> spool off;