How to convert clob data into multiple columns in Oracle? - sql

Question

In a Oracle table, I have a clob column (TEXT) which has data like below.
"Employee ID: 1
Hire Date: 24-Oct-2013
Name: XXXXX
Department: IT
Employee ID : 2
Name : YYYYY
Hire Date : 20-May-2014
Department: ITIS
Hire Date: 17-May-2017
Department:SMO
Name: ZZZZZ
Employee ID: 3"
The above CLOB data needs to be converted into multiple columns like below
Employee_ID Hire_Date Name Department
----------------------------------------------------
1 24-Oct-2013 XXXXX IT
2 20-May-2014 YYYYY ITIS
3 17-May-2017 ZZZZZ SMO
Please help me on this.

Answer 1

Code below is getting data from your string and insert column to temporary table, if you don't need temperory table you can use logic of getting data from string as you want
First create temperory table Employeeinfo like this
create global temporary table EmployeeInfo
(
EmployeeID varchar2(15),
HireDate varchar2(15),
Name varchar2(100),
Department varchar2(10)
)
on commit preserve rows;
Second use this code(this is pl/sql test script)
declare
lv_string varchar2(4000) := 'Employee ID: 1
Hire Date: 24-Oct-2013
Name: XXXXX
Department: IT
Employee ID : 2
Name : YYYYY
Hire Date : 20-May-2014
Department: ITIS
Hire Date: 17-May-2017
Department:SMO
Name: ZZZZZ
Employee ID: 3';
lv_Token varchar2(4000);
lv_Part varchar2(4000);
lv_FirstPart varchar2(4000);
lv_SecondPart varchar2(4000);
li pls_integer := 0;
lv_EmployeeID varchar2(15);
lv_HireDate varchar2(15);
lv_Name varchar2(100);
lv_Department varchar2(10);
function v_Partition(av_source long, av_separator varchar2,
ai_nth pls_integer) return varchar2 is
li_Sep pls_integer := length(av_Separator);
li_Begin pls_integer := 1 - li_Sep;
li_End pls_integer;
lv_Output long;
begin
li_End := instr(av_source, av_separator, 1, ai_nth);
if ai_Nth > 1 then
li_Begin := instr(av_source, av_separator, 1, ai_nth - 1);
if li_Begin = 0 then
return null;
end if;
end if;
if li_End > 0 then
lv_Output := substr(av_Source, li_Begin + li_Sep,
li_End - li_Begin - li_Sep);
elsif length(av_Source) >= li_Begin + li_Sep then
lv_Output := substr(av_Source, li_Begin + li_Sep,
length(av_Source) - li_Begin);
end if;
return lv_Output;
end;
function v_Token(av_source in out nocopy varchar2, av_separator varchar2)
return varchar2 is
lv_token varchar2(4000);
li_pos pls_integer;
begin
li_pos := instr(av_source, av_separator, 1, 1);
if li_pos > 0 then
lv_token := rtrim(substr(av_source, 1, li_pos - 1));
av_source := substr(av_source, li_pos + length(av_separator));
else
lv_token := rtrim(av_source);
av_source := '';
end if;
if av_Separator = ' ' then
av_Source := trim(av_Source);
end if;
return lv_token;
end;
begin
while lv_string is not null loop
lv_Token := v_Token(lv_string, chr(10));
if lv_Token is not null then
li := li + 1;
lv_FirstPart := trim(v_Partition(lv_Token, ':', 1));
put(lv_FirstPart);
lv_SecondPart := trim(v_Partition(lv_Token, ':', 2));
if lv_FirstPart like '%Employee ID%' then
lv_EmployeeID := lv_SecondPart;
elsif lv_FirstPart like '%Hire Date%' then
lv_HireDate := lv_SecondPart;
elsif lv_FirstPart like '%Name%' then
lv_Name := lv_SecondPart;
elsif lv_FirstPart like '%Department%' then
lv_Department := lv_SecondPart;
end if;
if li = 4 then
insert into EmployeeInfo
values
(lv_EmployeeID, lv_HireDate, lv_Name, lv_Department);
li := 0;
end if;
end if;
end loop;
--select * from EmployeeInfo; -- you can select from table
end;