[Hint] Convert BOOLEAN to numeric.

Dúvidas, dicas e truques de PL/SQL. Aqui também vão assuntos relacionados a pacotes, triggers, funções, Java-Stored Procedures, etc

Poston Mon, 14 Nov 2005 12:44 pm

This function DIUTIL.BOOL_TO_INT receives a Boolean value and returns in numeric.

Code: Select all
SQL> set serveroutput on
SQL> declare v boolean;
  2  begin
  3    v := true;
  4    dbms_output.put_line( 'True  retorna '||sys.diutil.bool_to_int(v) );
  5    v := false;
  6    dbms_output.put_line( 'False retorna '||sys.diutil.bool_to_int(v) );
  7  end;
  8  /
True  retorna 1
False retorna 0

PL/SQL procedure successfully completed.

works for comparisons:
Code: Select all
SQL> begin
  2    dbms_output.put_line( sys.diutil.bool_to_int(1=1) );
  3    dbms_output.put_line( sys.diutil.bool_to_int(1=2) );
  4  end;
  5  /

PL/SQL procedure successfully completed.

Unfortunately, does not work inside a SQL directly:
Code: Select all
SQL> select sys.diutil.bool_to_int(1=1) from dual;
select sys.diutil.bool_to_int(1=1) from dual
ERROR at line 1:
ORA-00907: missing right parenthesis

SQL> select sys.diutil.bool_to_int(true) from dual;
select sys.diutil.bool_to_int(true) from dual
ERROR at line 1:
ORA-00904: invalid column name
Location: Portland, OR USA

Thomas F. G

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