Hi all, I have an old Oracle legacy system that is running for over 15 years.Every now and then we need to extract data from this table@ ORacle 7i to be imported back to Oracle 10G.
My thoughts are to create a script of Insert statements in oracle 7 and that to be deployed back to Oracle 10G.
I found this scripts in Google and not sure how exactly this works.Any explanation on thsi scripts , would be greatly appreciated.I find this scripst may help to generate a set of insert statements from that table to the latest table at 10G.
<pre>
-- Step 1: Create this procedure:
create or replace Function ExtractData(v_table_name varchar2) return varchar2 As
b_found boolean:=false;
v_tempa varchar2(8000);
v_tempb varchar2(8000);
v_tempc varchar2(255);
begin
for tab_rec in (select table_name from user_tables where table_name=upper(v_table_name))
loop
b_found:=true;
v_tempa:='select ''insert into '||tab_rec.table_name||' (';
for col_rec in (select * from user_tab_columns
where
table_name=tab_rec.table_name
order by
column_id)
loop
if col_rec.column_id=1 then
v_tempa:=v_tempa||'''||chr(10)||''';
else
v_tempa:=v_tempa||',''||chr(10)||''';
v_tempb:=v_tempb||',''||chr(10)||''';
end if;
v_tempa:=v_tempa||col_rec.column_name;
if instr(col_rec.data_type,'CHAR') > 0 then
v_tempc:='''''''''||'||col_rec.column_name||'||''''''''';
elsif instr(col_rec.data_type,'DATE') > 0 then
v_tempc:='''to_date(''''''||to_char('||col_rec.column_name||',''mm/dd/yyyy hh24:mi'')||'''''',''''mm/dd/yyyy hh24:mi'''')''';
else
v_tempc:=col_rec.column_name;
end if;
v_tempb:=v_tempb||'''||decode('||col_rec.column_name||',Null,''Null'','||v_tempc||')||''';
end loop;
v_tempa:=v_tempa||') values ('||v_tempb||');'' from '||tab_rec.table_name||';';
end loop;
if Not b_found then
v_tempa:='-- Table '||v_table_name||' not found';
else
v_tempa:=v_tempa||chr(10)||'select ''-- commit;'' from dual;';
end if;
return v_tempa;
end;
/
show errors
-- STEP 2: Run the following code to extract the data.
set head off
set pages 0
set trims on
set lines 2000
set feed off
set echo off
var retline varchar2(4000)
spool c:\t1.sql
select 'set echo off' from dual;
select 'spool c:\recreatedata.sql' from dual;
select 'select ''-- This data was extracted on ''||to_char(sysdate,''mm/dd/yyyy hh24:mi'') from dual;' from dual;
-- Repeat the following two lines as many times as tables you want to extract
exec :retline:=ExtractData('dept');
print :retline;
exec :retline:=ExtractData('emp');
print :retline;
select 'spool off' from dual;
spool off
@c:\t1
-- STEP3: Run the spooled output c:\recreatedata.sql to recreate data.
Source:http://www.idevelopment.info/data/Oracle/DBA_tips/PL_SQL/PLSQL_5.shtml
</pre>