[英]how to use INSTR function to data present in column with data type as CLOB
我有一个表(table_clob)具有以下字段
create table table_clob ( file_data CLOB);
上表只有一行。 file_data具有以下数据:
"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",
我已经将上述数据插入到表中(包括列名和类型)。 我不想插入以'AOO'和'Z99'开头的行; 插入表格后,它应该有6行,看起来应该像这样:
"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",
谁能帮助我取得超越结果
您可以使用dbms_log.instr打包函数来执行此操作,请检查以下内容:
select file_data from table_clob
where dbms_lob.instr(file_data,'AOO')=0
or dbms_lob.instr(file_data,'Z99')=0 ;
此查询将clob分为几行:
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
输出:
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'
并插入到表中,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'
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