Oracle PL/SQL打印字符串的每个字母 [英] Oracle PL / SQL printing each letter of a string

问题描述

我需要单独打印出"Hello"一词的字母，这是我写的:

I need to print out the letters of the word 'Hello' each on it's own , I wrote this :

Declare
c1 Number:=1;
c2 Varchar2(5);
begin
for c1 in 1..5
loop
select substr('Hello' , c1 , 1 ) into c2 from dual;
dbms_output.put_line(c2);
end loop;
end;

但它会跳过前两个字母，而输出是

but it skips the first two letter and the out is

l
l
o

任何想法可能是什么问题? 谢谢.

any ideas what might be the problem? Thank you.

推荐答案

最好具有循环结束限制For i in 1..v_length这样，您不必在每次运行时都更改Loop限制.

Better to have Loop end limit For i in 1..v_length This way you do not have to change the Loop limit each time you run.

 Create or replace procedure print_string( IN_string IN varchar2 )
AS
v_length number(10);
v_out varchar2(20);
Begin
v_length := length(IN_string);
for i in 1..v_length
Loop
v_out  := substr(IN_string,i,1) ;
DBMS_OUTPUT.PUT_LINE(v_out);
End loop;
DBMS_OUTPUT.PUT_LINE('Text printed: ' || IN_string);
End;
 -- Procedure created.

BEGIN
print_string('Hello');
END;


-- Output:

H
e
l
l
o
Text printed: Hello

Statement processed.

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