Call sql file from plsql

Question

Hello,
I am stuck for many days in this issue. Hope someone helps me out.
I am using Oracle 11.
I am writing an utility of Purging the data from the database base on certain criteria.
We don't have physical(actual) partitions present on our system(since we are not using enterprise edition).
We have 57 tables representing 57 partitions. Then we are creating a view of all these 57 tables -
CREATE or REPLACE VIEW MY_VIEW AS
select [column_names] from table1
UNION ALL
select [column_names] from table2
UNION ALL
select [column_names] from table3
UNION ALL
select [column_names] from table57
This upper query is saved in the 'body' of user_views.
Now when a user wants to delete a partition--
-I am reading this query body in .sql file.
-Editing the .sql file ie removing the unwanted 'select * from tablen'
-Dropping the View.
-Recreating the view from the edited .sql file.
The issue is in creating the view on the fly from the procedure--
- I cant do EXECUTE IMMEDIATE 'CREATE VIEW...' and 'DBMS_SQL.PARSE' as the query body is longer than 32767 characters.
So i chose the option to do file write. In the file I write the VIEW query and then I want to create the View from this file.
Now i am not able to call the .sql which contains
CREATE OR REPLACE VIEW MYVIEW AS
select...
UNION ALL
select...
select...
The character length of this file is around 90000.
Please guide me in this issue.
Any new idea to manage the very large View in runtime is also welcome...
Thank You in advance
Vaib
arge View in runtime is also welcome...
Thank You in advance
Vaib

Answer 1

As it's 11g, even better would be to use EXECUTE IMMEDIATE as Solomon suggested. It can handle CLOBs.
If it were 10g, then fair enough use the DBMS_SQL package with something like...
SQL> ed
Wrote file afiedt.buf
  1  declare
  2    v_large_sql  CLOB;
  3    v_num        NUMBER := 0;
  4    v_upperbound NUMBER;
  5    v_sql        DBMS_SQL.VARCHAR2S;
  6    v_cur        INTEGER;
  7    v_ret        NUMBER;
  8  begin
  9    -- Build a very large SQL statement in the CLOB
10    LOOP
11      IF v_num = 0 THEN
12        v_large_sql := 'CREATE VIEW vw_tmp AS SELECT ''The number of this row is : '||to_char(v_num,'fm0999999')||''' as col1 FROM DUAL';
13      ELSE
14        v_large_sql := v_large_sql || ' UNION ALL SELECT ''The number of this row is : '||to_char(v_num,'fm0999999')||''' as col1 FROM DUAL';
15      END IF;
16      v_num := v_num + 1;
17      EXIT WHEN DBMS_LOB.GETLENGTH(v_large_sql) > 40000 OR v_num > 800;
18    END LOOP;
19    DBMS_OUTPUT.PUT_LINE('Length:'||DBMS_LOB.GETLENGTH(v_large_sql));
20    DBMS_OUTPUT.PUT_LINE('Num:'||v_num);
21    --
22    -- Now split that large SQL statement into chunks of 256 characters and put in VARCHAR2S array
23    v_upperbound := CEIL(DBMS_LOB.GETLENGTH(v_large_sql)/256);
24    FOR i IN 1..v_upperbound
25    LOOP
26      v_sql(i) := DBMS_LOB.SUBSTR(v_large_sql
27                                 ,256 -- amount
28                                 ,((i-1)*256)+1 -- offset
29                                 );
30    END LOOP;
31    --
32    -- Now parse and execute the SQL statement
33    v_cur := DBMS_SQL.OPEN_CURSOR;
34    DBMS_SQL.PARSE(v_cur, v_sql, 1, v_upperbound, FALSE, DBMS_SQL.NATIVE);
35    v_ret := DBMS_SQL.EXECUTE(v_cur);
36    DBMS_OUTPUT.PUT_LINE('View Created');
37* end;
SQL> /
Length:40015
Num:548
View Created
PL/SQL procedure successfully completed.
SQL> select count(*) from vw_tmp;
  COUNT(*)
       548
SQL> select * from vw_tmp where rownum <= 10;
COL1
The number of this row is : 0000000
The number of this row is : 0000001
The number of this row is : 0000002
The number of this row is : 0000003
The number of this row is : 0000004
The number of this row is : 0000005
The number of this row is : 0000006
The number of this row is : 0000007
The number of this row is : 0000008
The number of this row is : 0000009
10 rows selected.
SQL>