Have problem when using EXECUTE IMMEDIATE.

Question

Hi, i'm new here... i having problem when trying to use execute immediate statement... :(
procedure code as below:
create procedure copy_row(
p_table varchar2,
p_key varchar2,
p_keyval varchar2,
p_user varchar2,
p_frmto varchar2 default 'FROM')
IS
V_SQL VARCHAR2(500);
BEGIN
if upper(p_frmto)='FROM' then
V_SQL:='INSERT INTO '||P_TABLE||
' SELECT * FROM '||P_USER||'.'||P_TABLE||' WHERE '||P_KEY||' = '''||P_KEYVAL||'''';
elsif upper(p_frmto)='TO' then
V_SQL:='INSERT INTO '||P_USER||'.'||P_TABLE||
' SELECT * FROM '||P_TABLE||' WHERE '||P_KEY||' = '''||P_KEYVAL||'''';
end if;
EXECUTE IMMEDIATE V_SQL;
exception
when others then
raise_application_error(-20000,'PROCEDURE: COPY_ROW - UNABLE TO COPY ROWS! SQL='||V_SQL,TRUE);
end;
is there any limitation on using EXECUTE IMMEDIATE command? i need to use procedure because i'm using old form builder.... but the database server was 9i which able to use this command, so... i decide to use procedure....
i've done some testing on this.... assume the structure of schema1.table1 and schema2.table1 are same....
SQL> CREATE PROCEDURE TESTING IS
2 BEGIN
3 exeCute IMMEDIATE 'INSERT INTO schema1.table1 SELECT * FROM schema2.table1 WHERE column1 = ''abc''';
4 END;
5 /
Procedure created.
SQL> BEGIN
2 TESTING;
3 END;
4 /
BEGIN
ERROR at line 1:
ORA-00942: table or view does not exist
ORA-06512: at "SCHEMA1.TESTING", line 3
ORA-06512: at line 2
any idea?? or have better solution other than this?
database server:9i
sqlplus:SQL*Plus: Release 8.0.6.0.0

Answer 1

Do you have an access to tables you are going to insert into / select from ?
Dynamic SQL checks the access permissions at runtime, not at the compilation stage:
SQL> create user master identified by master default tablespace users temporary
  2  tablespace temp;
User created.
SQL> alter user master quota unlimited on users;
User altered.
SQL> grant create session to master;
Grant succeeded.
SQL> grant create table to master;
Grant succeeded.
SQL> grant create procedure to master;
Grant succeeded.
SQL> conn master/master
Connected.
SQL> create procedure wrong_prc
  2  is
  3  begin
  4   execute immediate 'insert into master.t select * from scott.t';
  5  end;
  6  /
Procedure created.
SQL> create table t (id number);
Table created.
SQL> exec wrong_prc;
BEGIN wrong_prc; END;
ERROR at line 1:
ORA-00942: table or view does not exist
ORA-06512: at "MASTER.WRONG_PRC", line 4
ORA-06512: at line 1
SQL> conn scott/tiger
Connected.
SQL> grant select on t to master;
Grant succeeded.
SQL> conn master/master
Connected.
SQL> exec wrong_prc;
PL/SQL procedure successfully completed.
SQL> select * from t;
        ID
         1And don't use literals in dynamic SQL - you should use binding variables instead.
Rgds.