java - SQL 开发人员 ORA-29531

Question

尝试让 Java 函数通过成员函数工作。我对此很陌生，所以我不知道错误可能在哪里。将复制所有相关代码。

create or replace
type sfera as object(
radius number(10,2),
member function tilpums(radius double precision) return double precision);

create or replace and compile JAVA source named "Papild" as 
public class Papild {
public static double rek(double radius)
{
return 3.14*radius*radius*radius*4/3;
}   
}

create or replace
type body sfera as
member function tilpums(radius double precision) return double precision as Language java 
Name 'Papild.rek(double) return double';
end;

Create table sferas of sfera;

Insert into sferas values(4);

select value(a).tilpums(radius) from sferas a;

并且从选择中我收到以下错误消息:

Error starting at line 1 in command:
select value(a).tilpums(radius) from sferas a
Error report:
SQL Error: ORA-29531: no method rek in class Papild
29531. 00000 -  "no method %s in class %s"
*Cause:    An attempt was made to execute a non-existent method in a
           Java class.
*Action:   Adjust the call or create the specified method.

我们将不胜感激所有帮助。

Answer 1

可以建议一种解决方法(不是通过工作来完美解决) - 使用独立函数并在成员一中调用它:

SQL> create or replace function standalon_tilpums(radius double precision)
  2  return double precision as Language java
  3  Name 'Papild.rek(double) return double';
  4  /

SQL> select standalon_tilpums(4) from dual;

STANDALON_TILPUMS(4)                                                            
--------------------                                                            
          267,946667                                                            

SQL> create or replace
  2  type sfera as object(
  3  radius number(10,2),
  4  member function tilpums(radius double precision) return double precision);
  5  /

SQL> create or replace
  2  type body sfera as
  3  member function tilpums(radius double precision) return double precision
  4  is begin return standalon_tilpums(radius); end;
  5  end;
  6  /

SQL> Create table sferas of sfera;

SQL> Insert into sferas values(4);

SQL> select value(a).tilpums(radius) from sferas a;

VALUE(A).TILPUMS(RADIUS)                                                        
------------------------                                                        
              267,946667