Why nested block is not executed here?

I created a procedure that will populate the tables and their counts in a scheme from when you run this procedure. For pl/sql nested block demonstration purposes and also I will create a trigger to update this table. Here is my code.

create or replace procedure schema_tab_count as

c number;

Start

Declare

Table_exist exception;

pragma exception_init (Table_exist,-00955);

Start

run immediately ' create table schema_tab_cnt (table_name varchar2 (30), count of number (10))';

exception when Table_exist then

run immediately 'Truncate table schema_tab_cnt;

end;

because me in (select * from tab) loop

run immediately ' count (1) select "| i.tname in c;

insert into schema_tab_cnt values (i.tname, c);

end loop;

commit;

exception: when other then null;

end;

/

CAUTION: Procedure created with compilation errors.

SQL > sho err

Errors in PROCEDURE SCHEMA_TAB_COUNT:

LINE/COL ERROR

-------- -----------------------------------------------------------------

14/1 PL/SQL: statement ignored

14/13 PL/SQL: ORA-00942: table or view does not exist

SQL >

Since the error log, its clear that the code in the nested block is not running.

What is the reason and the solution for this?

Thank you.

Ok as you have stated this code is for DEMO purpose I am going
to proceed further and fix your code. If you are going to use it for
any actual production purpose then its a bad idea and you should not
do it.

Also do not use EXCEPTION WHEN OTHERS the way you have used. Its always
certainly a bug. Always WHEN OTHERS exception must be followed by RAISE.

The issue is with your insert statement. The table actually does not exist
when you are compiling the code. So you need to make your insert
statement as Dynamic SQL so that it is not validated during compilation.

Like this.

SQL> create or replace procedure schema_tab_count
  2  as
  3       c number;
  4  begin
  5       declare
  6            table_exist exception;
  7            pragma exception_init (table_exist, -00955 ) ;
  8       begin
  9            execute immediate 'create table schema_tab_cnt(table_name varchar2(30),count number(10))';
 10       exception
 11            when table_exist then
 12                 execute immediate 'truncate table schema_tab_cnt';
 13       end;
 14
 15       for i in (select * from tab)
 16       loop
 17            execute immediate 'select count(1)  from "' || i.tname || '"' into c;
 18            execute immediate 'insert into schema_tab_cnt values(:1,:2)' using i.tname, c;
 19       end loop;
 20
 21       commit;
 22  end;
 23  /

Procedure created.

SQL> exec schema_tab_count

PL/SQL procedure successfully completed.

SQL> select * from schema_tab_cnt;

TABLE_NAME                          COUNT
------------------------------ ----------
BIN$+4sdomixCCXgRAAUTz6XRg==$0         12
BIN$+4sdomiyCCXgRAAUTz6XRg==$0          2
BIN$/BgKoshic2jgRAAUTz6XRg==$0     500000
DEPT                                    4
EFF_RATE_TMP                            0
EMP                                    11
E_MAIL_LOG                              0
LOGGER                                  0
SCHEMA_TAB_CNT                          8
TEST_MIG                                2

10 rows selected.

SQL>

Tags: Database

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