函数/包问题PL/SQL

Question

我正在尝试创建一个包含四个函数的包.每个函数将添加一组数字并从总数中减去一个.我在使语法正确方面遇到了很多麻烦.下面的函数自己工作,我尝试在最后调用第一个函数.

当我尝试创建包时,我得到一个错误,在第7行,"遇到符号"END"时期望以下之一:开始函数编译指示程序子类型类型当前游标删除存在于0.05秒之前"

在包体中,它表示"名称已被现有对象使用".我不明白,因为它必须在包的规范中声明,并且如果错误是已经存在名为functionbyfour的包,则创建或替换应解决此问题.

最后,当我尝试在包中使用一个函数时,它会说"遇到符号"BEGIN"时需要以下其中一个:: =.(@%; not null range default character符号";"代替"BEGIN"继续.ORA-06550:第5行,第43栏:PLS-00103:遇到以下其中一项时遇到符号"FROM":.(*%&= - +; </> at in是mod余数不是rem <>或!=或〜=> = <= <>和/或喜欢喜欢2喜欢...之间的|| multiset me".

我使用的是ORACLE EXPRESS 11g版,是PL/SQL的新手(4周).

任何输入都非常感谢.

CREATE OR REPLACE FUNCTION functionbyfour AS

 FUNCTION functone( first number, second number) RETURN NUMBER ;
 FUNCTION functtwo( first number, second number, third number) RETURN NUMBER ;
 FUNCTION functthree(first number, second number, third number, fourth number) RETURN     NUMBER ;
 FUNCTION functfour( first number, second number, third number, fourth number,fifth   number) RETURN NUMBER ;

END  functionbyfour;
/

CREATE OR REPLACE PACKAGE functionbyfour AS

FUNCTION functone (first number, second number ) RETURN number AS total number;
 BEGIN
total:=first + second – 1;
RETURN total;
DBMS_OUTPUT.PUT_LINE(total);
END functone;


FUNCTION functtwo (first number, second number, third number ) RETURN number AS  total     number;
BEGIN
total:=first + second + third – 1;
RETURN total;
DBMS_OUTPUT.PUT_LINE(total);
END functtwo;

FUNCTION functthree (first number, second number,third number, fourth number )     RETURN     number AS total number;
BEGIN
total:=first + second + third + fourth – 1;
RETURN total;
DBMS_OUTPUT.PUT_LINE(total);
END functthree;


FUNCTION functfour (first number, second number, third number, fourth number, fifth     number ) RETURN number AS total number;
BEGIN
total:=first + second + third + fourth + fifth – 1;
RETURN total;
DBMS_OUTPUT.PUT_LINE(total);
END functfour;

/

BEGIN

SELECT functionbyfour.functone(1,2) FROM DUAL;

END;

/

Answer 1

您需要创建一个名为FunctionByFour(CREATE OR REPLACE PACKAGE)的包

SQL> ed
Wrote file afiedt.buf

  1  CREATE OR REPLACE PACKAGE functionbyfour AS
  2   FUNCTION functone( first number, second number) RETURN NUMBER ;
  3   FUNCTION functtwo( first number, second number, third number) RETURN NUMBER ;
  4   FUNCTION functthree(first number, second number, third number, fourth number) RETURN     NUMBER ;
  5   FUNCTION functfour( first number, second number, third number, fourth number,fifth   number) RETURN NUMBER ;
  6* END  functionbyfour;
  7  /

Package created.

然后是一个相应的包体(CREATE OR REPLACE PACKAGE BODY).你还需要一个END包体(现在,你的代码在第四个函数的末尾结束)

SQL> ed
Wrote file afiedt.buf

  1  CREATE OR REPLACE PACKAGE BODY functionbyfour AS
  2    FUNCTION functone (first number, second number ) RETURN number AS total number;
  3    BEGIN
  4      total:=first + second - 1;
  5      RETURN total;
  6      DBMS_OUTPUT.PUT_LINE(total);
  7    END functone;
  8    FUNCTION functtwo (first number, second number, third number ) RETURN number AS  total     number;
  9    BEGIN
 10      total:=first + second + third - 1;
 11      RETURN total;
 12      DBMS_OUTPUT.PUT_LINE(total);
 13    END functtwo;
 14    FUNCTION functthree (first number, second number,third number, fourth number )     RETURN     number AS total number;
 15    BEGIN
 16      total:=first + second + third + fourth - 1;
 17      RETURN total;
 18      DBMS_OUTPUT.PUT_LINE(total);
 19    END functthree;
 20    FUNCTION functfour (first number, second number, third number, fourth number, fifth     number ) RETURN number AS total number;
 21    BEGIN
 22      total:=first + second + third + fourth + fifth - 1;
 23      RETURN total;
 24      DBMS_OUTPUT.PUT_LINE(total);
 25    END functfour;
 26* END functionbyfour;
SQL> /

Package body created.

完成后,您可以使用该功能

SQL> SELECT functionbyfour.functone(1,2) FROM DUAL;

FUNCTIONBYFOUR.FUNCTONE(1,2)
----------------------------
                           2

如果你想把SELECT语句放在一个PL/SQL块中,你需要声明一个局部变量并做一个SELECT INTO用函数的结果填充局部变量(你也可以只分配局部变量的结果)函数调用,无需使用a SELECT).

SQL> ed
Wrote file afiedt.buf

  1  DECLARE
  2    l_result NUMBER;
  3  BEGIN
  4    -- First approach
  5    l_result := functionByFour.functOne(1,2);
  6    dbms_output.put_line( l_result );
  7    -- Second approach
  8    SELECT functionByFour.functOne(1,2)
  9      INTO l_result
 10      FROM dual;
 11    dbms_output.put_line( l_result );
 12* END;
 13  /
2
2

PL/SQL procedure successfully completed.

此外,请注意,DBMS_OUTPUT.PUT_LINE在您的RETURN陈述后添加一个是毫无意义的.永远无法达到该代码.如果要将结果打印到DBMS_OUTPUT缓冲区,则需要先将结果打印到缓冲区RETURN.