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Oracle的PLS-00231 错误分析

Jun 07, 2016 pm 04:48 PM

Oracle的PLS-00231 错误分析 ,这个错误一般是函数的访问权限导致的,在包头声明为共有函数则全票通过,在包体声明的话位死于函数

Oracle的PLS-00231 错误分析 ,这个错误一般是函数的访问权限导致的,在包头声明为共有函数则全票通过,在包体声明的话位死于函数会导致错误。
 
create or replace function Two
      return Number
      is
      begin
        return 2;
      end Two;
 create or replace  procedure PrintTwo
      is
        myNum Number;
      begin
      select Two()
      into myNum
      from dual;
      dbms_output.put_line(myNum);
    end PrintTwo;
 以上函数和过程,放在函数和过程中声明,调用正常。注意two函数被printtwo过程以sql语句形式调用。
 
若将此二程序段放入一个package中,函数私有方式,则包体编译时出错,报pls-00231错误,函数不能在sql语句中使用之类。
 
原因为何?
 
pl sql和sql对于oracel而言,是两个不同的引擎,因而对于sql引擎而言,plsql包中私有的two函数,是无法发现的。
 
所以包中使用two函数,方法有两种:
 
1 在包头声明中声明two函数,即将two函数作公有声明,此时可以select two into mynum from dual;形式调用,当然这样将无法隐藏two函数。
 
2 以mynum:=two;方式调用,由于此种方式以pl sql引擎解析,所以可以正常使用以私有方式声明的two函数。
 
可见需以合适的方式将two函数暴露给sql或plsql引擎方可使用。那么若不将two作公有声明,而用包名.two方式调用,不一样可定位到two函数?哦当然不行,你忘了two未作公有声明,在包外无论如何都是不可见的哈哈。
 

那么对于包内一个返回集合类型的函数,,如:FUNCTION strsplit(p_list IN VARCHAR2, p_sep IN VARCHAR2 DEFAULT '|')
    RETURN str_split
    PIPELINED;
 
str_split为一个自定义集合类型:
 
 TYPE "STR_SPLIT" IS TABLE OF VARCHAR2 (4000);
 
此时,无论将type str_split以公有,或私有方式 在包中声明,均无法正常使用sql方式调用,由于返回为集合,也不能用plsql的kkk:=str_split方式调用。此时,只能将str_split定义为oracle的自定义数据类型:
 
create or replace TYPE "STR_SPLIT" IS TABLE OF VARCHAR2 (4000)
 
然后去除包内公有或私有的type str_split定义,即可使用sql方式调用函数。

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