Error handling in Oracle

Question

Hello,
Could anyone help to convert the following T-SQL statement to PL-SQL? Thanks inadvance!
BEGIN TRAN
UPDATE Table1 SET .......
SELECT @ReturnCode = @@error
IF @ReturnCode <> 0
     BEGIN          
          SELECT @msg = 'Error - update date feed'
GOTO Err_Handler
     END     
COMMIT TRAN
RETURN 0
Err_Handler:          
          ROLLBACK TRAN
          INSERT INTO LogTable(ProcessName, ProcessStatus)
               VALUES('Daily date feed', @msg)
          EXEC msdb.dbo.sp_send_dbmail      
               @recipients = '[email protected]',
               @Subject = 'Daily datafeed process failed',
               @body = @msg          
          RETURN 1

Answer 1

Sänjay wrote:
Hi,
Anonymous block example
SQL> declare
2   x number ;
3  begin
4    select count(*) into x from dual ;
5    update emp set empno=empno ;
6    dbms_output.put_line('Rows updated '|| sql%rowcount);
7  exception -- Exception Or Error Handling
8   when others then
9    rollback ;
10    dbms_output.put_line(SQLERRM);
11  end ;
12  /
Rows updated 14
PL/SQL procedure successfully completed.SSAwful example! I would fire programmers who would repeatetly produce such code. Rule #1: Avoid "when others expetions" wherever possible!
I know you're capable of give much better examples.
Btw: This code would produce the same result in sql*plus without any exception block:
proof
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for HPUX: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
SQL>
SQL> drop table test;
Table dropped.
SQL> set serveroutput on
SQL> create table test (col1 number);
Table created.
SQL>
SQL> /* first without exception */
SQL> declare
  2     x number ;
  3  begin
  4     insert into test values (1);
  5     select length(dummy) into x from dual where 1=1;
  6  end;
  7  /
PL/SQL procedure successfully completed.
SQL>
SQL> select * from test;
      COL1
         1
SQL>
SQL> /* now add some error */
SQL>
SQL> declare
  2     x number ;
  3  begin
  4     insert into test values  (2);
  5     select length(dummy) into x from dual where 1=2;
  6  end;
  7  /
declare
ERROR at line 1:
ORA-01403: no data found
ORA-06512: at line 5
SQL>
SQL> select * from test;
      COL1
         1
SQL>
SQL> As you can see the second insert was rollbacked. But be careful, this works only for ANONYMOUS pl/sql blocks.
Edited by: Sven W. on Jul 24, 2009 3:17 PM