how to use INSTR function to data present in column with data type as CLOB

Question

I have a table(table_clob) which has follwing field

create table table_clob ( file_data CLOB); 

above table has only one row . file_data has following data:

"A00",399,"yhnj",20150302,055522,100215 
"E51",987456111,147852,10000,"bnncnf","abc","I","XYZ","EA","PO16", Z99,3 
"E51",985856111,147852,10000,"wertt","tgb","I","XYZ","EA","PO16","7GZ",29 
"E51",456987123,"469555",155000,"reeggdd","edc","D","ABC","EM","GU16","7HF" 52 
"E51",456456852,125500,468566,"wsxcde","BUS","I","ABC","SE","MT12","8JG",18 
"E51",987456111,147852,10000,"pokmhj","BUS","I","XYZ","EA","PO16","7GZ",

i have insert above data into a table(including column names and types) . i don't want to insert row starting with 'AOO' and 'Z99' ; after inserting into a table .It should have 6 rows and should look like:

"E51",987456111,147852,10000,"bnncnf","abc","I","XYZ","EA","PO16", "E51",985856111,147852,10000,"ABC Power Station","BUS","I","XYZ","EA","PO16","7GZ",29 "E51",985856111,147852,10000,"wertt","tgb","I","XYZ","EA","PO16","7GZ",29 
"E51",456987123,"469555",155000,"reeggdd","edc","D","ABC","EM","GU16","7HF",52 
"E51",456456852,125500,468566,"wsxcde","yhn","I","ABC","SE","MT12","8JG",18 
"E51",987456111,147852,10000,"pokmhj","tgb","I","XYZ","EA","PO16","7GZ",

can anyone help me to get above result

Answer 1

You can use dbms_log.instr packaged function to do this , check the following:

select file_data from table_clob
   where dbms_lob.instr(file_data,'AOO')=0 
         or dbms_lob.instr(file_data,'Z99')=0 ;

Answer 2

This query divides clob into individual lines:

select 
    substr(file_data, instr(file_data, '"E51"', 1, level), 
    decode(instr(file_data, '"E51"', 1, level + 1), 0, length(file_data), 
      instr(file_data, '"E51"', 1, level + 1) - instr(file_data, '"E51"', 1, level)-1)
    ) data
  from table_clob
  connect by instr(file_data, '"E51"', 1, level) > 0

Output:

DATA                                                                           
--------------------------------------------------------------------------------
"E51",987456111,147852,10000,"bnncnf","abc","I","XYZ","EA","PO16", Z99,3         
"E51",985856111,147852,10000,"wertt","tgb","I","XYZ","EA","PO16","7GZ",29        
"E51",456987123,"469555",155000,"reeggdd","edc","D","ABC","EM","GU16","7HF",52   
"E51",456456852,125500,468566,"wsxcde","BUS","I","ABC","SE","MT12","8JG",18      
"E51",987456111,147852,10000,"pokmhj","BUS","I","XYZ","EA","PO16","7GZ"  

Eliminate unwanted rows for instance where data not like 'Z99' and insert into table like here:

insert into table_clob (file_data) 
select data from
  (select 
      substr(file_data, instr(file_data, '"E51"', 1, level), 
      decode(instr(file_data, '"E51"', 1, level + 1), 0, length(file_data), 
        instr(file_data, '"E51"', 1, level + 1) - instr(file_data, '"E51"', 1, level)-1)
      ) data
    from table_clob
    connect by instr(file_data, '"E51"', 1, level) > 0)
  where data not like 'Z99'