pl/sql programming 02 创建并运行plsql代码

 1 /*
 2  * chap 02
 3  * -------------------------------------------------
 4 */
 5 
 6 -- 01
 7 create or replace function wordcount(str in varchar2)
 8     return pls_integer
 9 as
10     words pls_integer := 0;
11     len pls_integer := nvl(length(str), 0);
12     inside_a_word boolean;
13 begin
14     for i in 1..len + 1
15     loop
16         if ascii(substr(str, i, 1)) < 33 or i > len
17         then
18             if inside_a_word
19             then
20                 words := words + 1;
21                 inside_a_word := false;
22             end if;
23         else
24             inside_a_word := true;
25         end if;
26 end;
27 /
28 show error;

create function wordcount(str in varchar2)
    return pls_integer
as
    declare local variables here
    -- 注意, 这里直接就可以声明了, 不需要在使用declare 声明了+
    -- declare 声明, 是针对独立的pl/sql块的
begin
    implement algorithm here
exception
    exception execute
end;
/

Create Function