Oracle中PL/SQL的循环语句

PL/SQL的三种形式的循环：
1.LOOP（无条件循环）：
loop
statements;
end loop;
2.WHILE（有条件循环）：
while condition loop
statements;
end loop;
3.FOR（固定次数循环）：
for counter in value1 .. value2
loop
statements;
end loop;

实例：分别用三种循环输出1-100

loop:

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declare i number;

begin

i := 1;

loop

if i > 100 then

goto quit;

end if;

dbms_output.put_line(i);

i := i + 1;

end loop;

<<quit>>

null;

end;

declare i number;
begin
i := 1;
loop
if i > 100 then
goto quit;
end if;
dbms_output.put_line(i);
i := i + 1;
end loop;
<<quit>>
null;
end;

while:

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declare

i number;

begin

i := 1;

while i<=100 loop

dbms_output.put_line(i);

i := i+1;

end loop;

end;

declare
i number;
begin
i := 1;
while i<=100 loop
dbms_output.put_line(i);
i := i+1;
end loop;
end;

for:

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declare

i number;

begin

for i in 1..100

loop

dbms_output.put_line(i);

end loop;

end;

declare
i number;
begin
for i in 1..100
loop
dbms_output.put_line(i);
end loop;
end;