我正在为我的公司整理一系列用 Oracle PL/SQL 编写的 SQL 脚本。我遇到了一个基本脚本，底部附近有一个奇怪的斜线。它以这种方式被检入 CVS。这是纯语法错误还是有一些我不知道的功能。稍微混淆的脚本：
set serveroutput on size 2000;
--PL/SQL block to link ISSN in serial base on a company's ISSN text file
declare
cursor ItemCursor is
select issn is2 from web.obfuscated1 where issn is not null
union
select eissn is2 from web.obfuscated1 where eissn is not null;
cursor ItemCursor1(aIS varchar2) is
select obfuscated1_uid from web.obfuscated1 where group_num is null and issn in (
select distinct issn from web.obfuscated1 where issn = aIS or eissn = aIS
union
select distinct eissn from web.obfuscated1 where issn = aIS or eissn = aIS
)
union
select obfuscated1_uid from web.obfuscated1 where eissn in (
select distinct issn from web.obfuscated1 where issn = aIS or eissn = aIS
union
select distinct eissn from web.obfuscated1 where issn = aIS or eissn = aIS
);
cursor ItemCursor2(aIS9 varchar2) is
select obfuscated1_uid from web.obfuscated1 where issn in (
select distinct issn from web.obfuscated1 where issn = aIS9 or eissn = aIS9
union
select distinct eissn from web.obfuscated1 where issn = aIS9 or eissn = aIS9
) and group_num is null;
agroup number(8);
processCount number(8);
------------------------------------------------------
-- MAIN BLOCK -----------------------------------
-------------------------------------------------
begin
processCount := 0;
agroup := null;
for itemRec in ItemCursor loop
agroup := null;
begin
select group_num into agroup from web.obfuscated1 where issn in (
select distinct issn from web.obfuscated1 where issn = itemRec.is2 or eissn = itemRec.is2
union
select distinct eissn from web.obfuscated1 where issn = itemRec.is2 or eissn = itemRec.is2
) and group_num is not null and issn is not null and eissn is not null and rownum <= 1;
exception
when no_data_found then
agroup := null;
when others then
agroup := null;
end;
if agroup is not null then
for itemRec2 in ItemCursor2(itemRec.is2) loop
update web.obfuscated1 set group_num = agroup where obfuscated1_uid = itemRec2.obfuscated1_uid;
commit;
end loop;
else
processCount := processCount + 1;
for itemRec1 in ItemCursor1(itemRec.is2) loop
update web.obfuscated1 set group_num = processCount where obfuscated1_uid = itemRec1.obfuscated1_uid;
commit;
end loop;
commit;
end if;
end loop;
dbms_output.put_line('Total record read: ' || processCount);
exception
when others then
dbms_output.put_line('ORA' || sqlcode);
dbms_output.put_line(substr(sqlerrm, 1, 255));
dbms_output.put_line('ORA- Error during processing ' );
end;
/
exit;