ORACLE：使用可选参数创建ORACLE过程

在大多数asp.net应用程序中，页面带有过滤器是很常见的（通常有5个或5个以上的标准，例如：filter by:lastname、firstname、date等）

主要处理TSQL（SQLServer2000/2005）。我将在我的程序中处理标准，例如：

PARAMETERS Param1 VARCHAR(32), Param2 INT; 

SELECT columns FROM table WHERE 
    ([Param1] IS NULL OR column1 = [Param1]) 
    AND 
    ([Param2] IS NULL OR column2 = [Param2])

create or replace procedure optPar(a in number, b in number := null, c number := 999) is
begin
    dbms_output.put_line(a || ', ' || b || ', ' || c);
end;

有人能告诉我如何用PL/SQL处理可选参数吗？谢谢，例如：

PARAMETERS Param1 VARCHAR(32), Param2 INT; 

SELECT columns FROM table WHERE 
    ([Param1] IS NULL OR column1 = [Param1]) 
    AND 
    ([Param2] IS NULL OR column2 = [Param2])

create or replace procedure optPar(a in number, b in number := null, c number := 999) is
begin
    dbms_output.put_line(a || ', ' || b || ', ' || c);
end;

该过程需要

a

参数：

SQL> exec optPar();
BEGIN optPar(); END;

      *
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to 'OPTPAR'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

SQL> exec optPar( a=> 1, c=> 3);
1, , 3

PL/SQL procedure successfully completed.

您可以省略

b，c

：

SQL> exec optPar(1);
1, , 999

PL/SQL procedure successfully completed.

SQL> exec optPar(1, 2);
1, 2, 999

PL/SQL procedure successfully completed.

SQL> exec optPar(1, 2, 3);
1, 2, 3

PL/SQL procedure successfully completed.

在这种情况下，显式传递参数比不使用可选参数更为重要，以便轻松了解为每个参数指定的值：

SQL> exec optPar();
BEGIN optPar(); END;

      *
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to 'OPTPAR'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

SQL> exec optPar( a=> 1, c=> 3);
1, , 3

PL/SQL procedure successfully completed.

例如：

PARAMETERS Param1 VARCHAR(32), Param2 INT; 

SELECT columns FROM table WHERE 
    ([Param1] IS NULL OR column1 = [Param1]) 
    AND 
    ([Param2] IS NULL OR column2 = [Param2])

create or replace procedure optPar(a in number, b in number := null, c number := 999) is
begin
    dbms_output.put_line(a || ', ' || b || ', ' || c);
end;

该过程需要

a

参数：

SQL> exec optPar();
BEGIN optPar(); END;

      *
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to 'OPTPAR'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

SQL> exec optPar( a=> 1, c=> 3);
1, , 3

PL/SQL procedure successfully completed.

您可以省略

b，c

：

SQL> exec optPar(1);
1, , 999

PL/SQL procedure successfully completed.

SQL> exec optPar(1, 2);
1, 2, 999

PL/SQL procedure successfully completed.

SQL> exec optPar(1, 2, 3);
1, 2, 3

PL/SQL procedure successfully completed.

在这种情况下，显式传递参数比不使用可选参数更为重要，以便轻松了解为每个参数指定的值：

SQL> exec optPar();
BEGIN optPar(); END;

      *
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to 'OPTPAR'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

SQL> exec optPar( a=> 1, c=> 3);
1, , 3

PL/SQL procedure successfully completed.

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差不多一样，差不多一样。