Trp the exception ORA-00001: unique constraint

Question

Want to trap the exception
ORA-00001: unique constraint (SCHEMA.CONSTRAINT_NAME) violated So can any one tell me the Exception name (like NO_DATA_FOUND).

Answer 1

You can map error numbers to exception names, although this isn't good practice with errors that are in the pre-defined exception list.
SQL> create table t (id NUMBER, txt VARCHAR2(10));
Table created.
SQL> alter table t add primary key (id);
Table altered.
SQL> insert into t values (1, 'A');
1 row created.
SQL> insert into t values (1, 'B');
insert into t values (1, 'B')
ERROR at line 1:
ORA-00001: unique constraint (SCOTT.SYS_C0053239) violated
SQL> ed
Wrote file afiedt.buf
  1  declare
  2    exc_unique_fail exception;
  3    pragma exception_init(exc_unique_fail, -1);
  4  begin
  5    insert into t values (1, 'B');
  6    dbms_output.put_line('insert successful');
  7  exception
  8    when exc_unique_fail then
  9      dbms_output.put_line('unique constraint failure detected');
10* end;
SQL> /
unique constraint failure detected
PL/SQL procedure successfully completed.
SQL>