默认值,oracle sp call

有时候事情就像你希望的那样简单。

首先,一个带有默认值的表。。。

SQL> create table t23 (
  2      id number not null primary key
  3      , col_d date default sysdate not null )
  4  /

Table created.

SQL> insert into t23 values (1, trunc(sysdate, 'yyyy'))
  2  /

1 row created.

SQL> select * from t23
  2  /

        ID COL_D
---------- ---------
         1 01-JAN-10

SQL>

接下来是更新默认列的过程。。。

SQL> create or replace procedure set_t23_date
  2      ( p_id in t23.id%type
  3        , p_date in t23.col_d%type )
  4  is
  5  begin
  6      update t23
  7      set col_d = p_date
  8      where id = p_id;
  9  end;
 10  /

Procedure created.

SQL>

... 但这不是我们想要的:

SQL> exec set_t23_date ( 1, null )
BEGIN set_t23_date ( 1, null ); END;

*
ERROR at line 1:
ORA-01407: cannot update ("APC"."T23"."COL_D") to NULL
ORA-06512: at "APC.SET_T23_DATE", line 6
ORA-06512: at line 1


SQL>

所以,让我们尝试添加一个默认选项。。。

SQL> create or replace procedure set_t23_date
  2      ( p_id in t23.id%type
  3        , p_date in t23.col_d%type )
  4  is
  5  begin
  6      if p_date is not null then
  7          update t23
  8          set col_d = p_date
  9          where id = p_id;
 10      else
 11          update t23
 12          set col_d = default
 13          where id = p_id;
 14      end if;
 15  end;
 16  /

Procedure created.

SQL>

... 瞧!

SQL> exec set_t23_date ( 1, null )

PL/SQL procedure successfully completed.

SQL>
SQL> select * from t23
  2  /

        ID COL_D
---------- ---------
         1 28-FEB-10

SQL>

编辑

这些评论真令人沮丧。构建PL/sqlapi的关键在于 更容易的

你被迫接受的程序是:

create or replace procedure notEditable(varchar2 bar) as
begin
  --update statement
  null;
end;

使用方法:

begin
  notEditable(bar=>null);
end;

我没有编译,但我相信这是正确的语法。