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

Tags: Database

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