Need help regarding the maximum limit for data type

Question

Hi,
this is Sravan. for my application am inserting the bulk data in XML format into a column of Database table.
the sample inserted XML data will be in format... like
'<ACC count = "10">
<Acc ac_no = "1111111111" cn_nr = "US" eflag = "Y" />
<Acc ac_no = "1111111111" cn_nr = "US" eflag = "Y" />
<Acc ac_no = "1111111111" cn_nr = "US" eflag = "Y" />
<Acc ac_no = "1111111111" cn_nr = "US" eflag = "Y" />
<Acc ac_no = "1111111111" cn_nr = "US" eflag = "Y" />
<Acc ac_no = "1111111111" cn_nr = "US" eflag = "Y" />
<Acc ac_no = "1111111111" cn_nr = "US" eflag = "Y" />
<Acc ac_no = "1111111111" cn_nr = "US" eflag = "Y" />
<Acc ac_no = "1111111111" cn_nr = "US" eflag = "Y" />
<Acc ac_no = "1111111111" cn_nr = "US" eflag = "Y" />
</ACC>'
this data in XML can have more than 1000 accounts.
now, i need to take a Parameter value from XML node and write into a file. for this i have written a procedure by looping the Nodes from XML data and building Dynamic Query like..
if nvl(v_int, 0) > 0 then
v_sql := '';
     for v_count in 1..v_int
     loop
     if v_sql is null then
          v_sql := 'select extractvalue(empdetails, ''/ACC/Acc' || v_count ||'/@ac_no'')||extractvalue(empdetails, ''/ACC/Acc' || v_count
||'/@cn_nr'')||extractvalue(empdetails, ''/ACC/Acc' || v_count ||'/@eflag'') string from sample1';
     elsif v_sql is not null then
               v_sql := v_sql || ' union all select extractvalue(empdetails, ''/ACC/Acc' || v_count ||'/@ac_no'')||extractvalue(empdetails, ''/ACC/Acc' || v_count
||'/@cn_nr'')||extractvalue(empdetails, ''/ACC/Acc' || v_count ||'/@eflag'') string from sample1';
          end if;
     end loop;
end if;
i will get this variable "v_int" from <ACC count = "10"> ACC count Attribute, here 10 is the value for v_int variable but in real time the variable value can be more than 1000.
at the time of Building Dynamic Query I make using the Variable v_SQL which is of Data Type "Long",
this variable stores dynamic query which is build at the time of executing procedure but this v_sql Variable is throughing Exception that ....
"numeric or value error Character String Buffer is Too Small"... but Long Data type will store upto 2GB..
this variable cant able to hold much data which is dynamically build.
will you please help me to resolve this issue Or will u suggest me another method to pick the data from XML column.
thanks,
sravan.

Answer 1

user11176969 wrote:
i changed the code, now its working fine.
direct assigning the dynamic query to a Clob variable raised error.
for dynamic query building i used another variable and assigned this variable value to actual query variable.Nice!