Solution for the mutation of table of error when using triggers

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• How can I write the trigger for the global temporary Table

  Hi Grus,
  How can I write the trigger for the global temporary Table.
  
  I created the TWG with trigger using the script below.
  
  
  CREATE A GLOBAL_TEMP GLOBAL TEMPORARY TABLE
  (
  EMP_C_NAME VARCHAR2 (20 BYTE)
  )
  ON COMMIT PRESERVE ROWS;
  
  
  CREATE OR REPLACE TRIGGER TRI_GLOBAL_TEMP
  BEFORE DELETE, UPDATE OR INSERT
  ON GLOBAL_TEMP
  REFERRING AGAIN AS NINE OLD AND OLD
  FOR EACH LINE
  BEGIN
  INSERT INTO VALUES EMPNAME (: OLD.) EMP_C_NAME);
  END;
  /
  
  
  trigger was created successfully, but her would not insert EMPNAME Table...
  
  Please guide if mistaken or not? If not wanting to give a correct syntax with example
  
  
  Thanks in advance,
  Arun M M

  BEGIN
  INSERT INTO EMPNAME VALUES (:OLD.EMP_C_NAME);
  END;
  

  you are referencing old value in insert stmt.
  
  BEGIN
  INSERT INTO EMPNAME VALUES (:new.EMP_C_NAME);
  END;
  

  then run your app, it works very well...

  CREATE GLOBAL TEMPORARY TABLE GLOBAL_TEMP
  (
  EMP_C_NAME VARCHAR2(20 BYTE)
  )
  ON COMMIT PRESERVE ROWS;
  
  CREATE OR REPLACE TRIGGER TRI_GLOBAL_TEMP
  BEFORE DELETE OR UPDATE OR INSERT
  ON GLOBAL_TEMP
  REFERENCING NEW AS NEW OLD AS OLD
  FOR EACH ROW
  BEGIN
  dbms_output.put_line(:OLD.EMP_C_NAME||'yahoo');
  INSERT INTO EMPNAME VALUES (:new.EMP_C_NAME);
  dbms_output.put_line(:OLD.EMP_C_NAME);
  END;
  /
  
  create table EMPNAME as select * from GLOBAL_TEMP where 1=2
  
  insert into GLOBAL_TEMP values('fgfdgd');
  commit;
  select * from GLOBAL_TEMP;
  select * from EMPNAME;
  
  output:
  1 rows inserted
  commit succeeded.
  EMP_C_NAME
  --------------------
  fgfdgd               
  
  1 rows selected
  
  EMP_C_NAME
  --------------------
  fgfdgd               
  
  1 rows selected
  

  He got Arun

  Published by: OraclePLSQL on December 28, 2010 18:07

• FOR the UPDATE OF table.field

  Why the following does it
  

  create table division (code varchar2(2) primary key, div_desc varchar2(20));
  
  insert into division values ('01', 'Ninja assassins');
  insert into division values ('02', 'Working for the man');
  
  
  create table employees (tk number, first_name varchar2(10), last_name varchar2(10), code varchar2(2) references division(code));
  
  insert into employees values (1, 'Chuck', 'Smith', '01');
  insert into employees values (2, 'John',  'Smith', '02');
  
  DECLARE
  
    CURSOR my_csr IS
      Select e.tk, e.first_name, e.last_name
      From employees e, division d
      Where e.code = d.code
        and e.code = '01'
        and e.last_name = 'Smith'
      For update;
      
      cnt_updated NUMBER;
  
  BEGIN
  
    cnt_updated := 0; 
  
    FOR my_row IN my_csr
    LOOP
  
      Update employees
      Set last_name = 'Forbes'
      Where current of my_csr;
      
      cnt_updated := cnt_updated + SQL%ROWCOUNT;
      dbms_output.put_line('You updated '||cnt_updated||' records');
  
    END LOOP;
  END;

  but just add the clause "for update" allows to make the point?

  DECLARE
  
    CURSOR my_csr IS
      Select e.tk, e.first_name, e.last_name
      From employees e, division d
      Where e.code = d.code
        and e.code = '01'
        and e.last_name = 'Smith'
      For update *of e.tk*;

  We discovered this recently, and fellow developers are wondering "why?" Is there a reason documented, or is - just how it is?
  
  Thank you
  -= Chuck

  of 'of the user to the database PL/SQL Oracle® reference Guide. "
  "10g Release 2 (10.2):
  "During the interrogation of several tables, you can use the FOR UPDATE clause to limit the line blocking to specific tables. Rows in a table are locked unless done FOR UPDATE OF clause refers to a column in the table. For example, the following query locks the rows in the employees table, but not in the departments table:

  DECLARE
  CURSOR c1 IS SELECT last_name, department_name FROM employees, departments
  WHERE employees.department_id = departments.department_id
  AND job_id = "SA_MAN."
  FOR the UPDATE OF treatment; »

  a little demo:

  SQL> select * from v$version;
  
  BANNER
  -------------------------------------------------------------------------
  
  Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
  PL/SQL Release 11.1.0.6.0 - Production
  CORE    11.1.0.6.0      Production
  TNS for 32-bit Windows: Version 11.1.0.6.0 - Production
  NLSRTL Version 11.1.0.6.0 - Production
  
    1   DECLARE
    2     CURSOR my_csr IS
    3       Select e.tk, e.first_name, e.last_name, e.rowid
    4       From employees_t e, division d
    5       Where e.code = d.code
    6         and e.code = '01'
    7         and e.last_name = 'Smith'
    8       For update of e.tk;
    9       cnt_updated NUMBER;
   10   BEGIN
   11     cnt_updated := 0;
   12     FOR my_row IN my_csr
   13     LOOP
   14       Update employees_t
   15       Set last_name = 'Forbes'
   16       Where current of my_csr;
   17       cnt_updated := cnt_updated + SQL%ROWCOUNT;
   18       dbms_output.put_line('You updated '||cnt_updated||' records');
   19     END LOOP;
   20*  END;
  SQL> /
  You updated 1 records
  
  PL/SQL procedure successfully completed.
  
  SQL> ed
  Wrote file afiedt.buf
  
    1   DECLARE
    2     CURSOR my_csr IS
    3       Select e.tk, e.first_name, e.last_name, e.rowid
    4       From employees_t e, division d
    5       Where e.code = d.code
    6         and e.code = '01'
    7         and e.last_name = 'Smith'
    8       For update;-- of e.tk;
    9       cnt_updated NUMBER;
   10   BEGIN
   11     cnt_updated := 0;
   12     FOR my_row IN my_csr
   13     LOOP
   14       Update employees_t
   15       Set last_name = 'Forbes'
   16       Where current of my_csr;
   17       cnt_updated := cnt_updated + SQL%ROWCOUNT;
   18       dbms_output.put_line('You updated '||cnt_updated||' records');
   19     END LOOP;
   20*  END;
  SQL> /
  
  PL/SQL procedure successfully completed.
  

  Amiel

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  We use Oracle 11.2.0.2. We intend to implement dbms_crypto to encrypt some columns. Clone us the production data at the lower environment (DEV, QC).
  
  The lowest environments, we do not want to obtain the sensitive data from production and do not plan to use the same key. Instead of getting an error when using different keys, is it possible to get a different set of results.
  
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  DECLARE
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    l_ccn_raw           RAW(128) := UTL_RAW.cast_to_raw(l_credit_card_no);
   
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    l_encrypted_raw     RAW(2048);
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  END;

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