如何使用INSTR函數處理數據類型為CLOB的列中的數據

Question

我有一個表（table_clob）具有以下字段

create table table_clob ( file_data CLOB); 

上表只有一行。 file_data具有以下數據：

"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",

我已經將上述數據插入到表中（包括列名和類型）。 我不想插入以'AOO'和'Z99'開頭的行； 插入表格后，它應該有6行，看起來應該像這樣：

"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",

誰能幫助我取得超越結果

Answer 1

您可以使用dbms_log.instr打包函數來執行此操作，請檢查以下內容：

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

Answer 2

此查詢將clob分為幾行：

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

輸出：

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"  

消除不必要的行，例如where data not like 'Z99'並插入到表中，如下所示：

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'