Question

Reading a csv file using plsql oracle 10g

Asked by: darrylf290567

Hi All,

I want to be able to skip the first line that has header column titles and only start reading the data in the second line and onwards. How can I do this can someone please help me. There must be a generic way.

Please help.
darrylf290567

The example is:
first line of .csv file
SITE_ACCESS_CODE, MY_CODE, SITE_ID
second line of .csv file where I want to actually read the below data.
456T,ABC,123A

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Asked On: 2008-01-18 at 00:19:32ID23092749
Tags: plsql 10g
Topics: PL / SQL
,; Oracle 10.x
Participating Experts: 3
Points: 125
Comments: 15

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Answers

by: sujith80Posted on 2008-01-18 at 00:34:52ID: 20688765

What tool are you using to load the data?
If you are using sqlloader, you can use the key word SKIP, your control line will look like :

LOAD DATA (SKIP 1)
.
.

by: sonicefuPosted on 2008-01-18 at 00:55:37ID: 20688826

PL/SQL programs can read and write operating system text files
http://download-west.oracle.com/docs/cd/B19306_01/appdev.102/b14258/u_file.htm#sthref14093

Or

Use External Table as follws

-----------------
1)
--friends.csv---located at c:\  root directory
empId Lnam Fname SSN     email                 exp 
001,Hutt,Jabba,896743856,jabba@thecompany.com,18
002,Simpson,Homer,382947382,homer@thecompany.com,20
003,Kent,Clark,082736194,superman@thecompany.com,5
004,Kid,Billy,928743627,billythkid@thecompany.com,9
005,Stranger,Perfect,389209831,nobody@thecompany.com,23
006,Zoidberg,Dr,094510283,crustacean@thecompany.com,1
------------------
2)
connect as a DBA user for example system or sys or any other DBA user
SQL> conn system/password
-------------------
3)
SQL> create or replace directory external_data_dir
  2  as 'c:\';
------------------
4)
SQL> grant read,write on directory external_data_dir to scott;
-----------------
5)
SQL> connect scott/tiger
-----------------
6)
SQL> create table external_friends
         ( empl_id varchar2(3),
           last_name varchar2(50),
           first_name varchar2(50),
           ssn varchar2(9),
          email_addr varchar2(100),
           years_of_service number(2,0)
         )
         organization external
        ( default directory external_data_dir
          access parameters
         ( records delimited by newline
           skip 1                 -- will skip first one row
           fields terminated by ','
         )
         location ('friends.csv')  
     );
--------------------------
you can create external table using PL/SQL block
 
.....
....
Begin
....
...
 
execute immediate 'create table external_friends..........';
 
...
....
.......
End;

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by: sdstuberPosted on 2008-01-18 at 05:49:39ID: 20690045

How you do it will depend on how you are reading the csv file.

1-
If you're using pl/sql, can I assume you're using utl_file?
If so, simply include a get_line as the first line of your procedure and simply ignore the results.
Then enter your loop to process the rest of the file.

2-
If you are using dbms_lob with bfiles, then use dbms_lob.instr to find the first end-of-line delimiter.
might be carrriage return, might be new line, might be both. Depends on your format.

Then start looping through your lines starting at that lob index +1.

3-
If you are using an external table and it has the headers in csv format too, that's easiest of all.
Simply exclude the first row in your cursor query.

select * from (select rownum rn, external_table.* from external_table)
where rn > 1

or, like the utl_file solution, fetch once, then ignore the results before entering the loop to process the rest of the cursor.

by: darrylf290567Posted on 2008-01-19 at 02:59:09ID: 20696817

Hi All,

ststuber, Can you actually show me in code how i would do the reading of the example data i have given you in this question using PLSQL code using the UTL_FILE package?

Please can you help by actually doing the code for this example data and I will take it from there.

How do you ignore the first line using plsql, and then continue reading the second line, using the example data in the question.

Kindest Regards
darrylf290567

by: sonicefuPosted on 2008-01-19 at 15:25:07ID: 20699471

<<I want to be able to skip the first line that has header column.......................................>>
Following link will guide you with PL/SQL code
http://www.oracle-base.com/articles/9i/UTL_FILERandomAccessOfFiles9i.php

by: darrylf290567Posted on 2008-01-20 at 15:52:40ID: 20703017

Hi sdstuber,

How do you do this in the PLSQL code:

1-
If you're using pl/sql, can I assume you're using utl_file?
If so, simply include a get_line as the first line of your procedure and simply ignore the results.
Then enter your loop to process the rest of the file.

Would you put get_line inside the loop or just before the loop starts?
How would getline inside the loop know NOT to read the first line? Will there be some sort of flag?

PLEASE HELP
darrylf290567

by: darrylf290567Posted on 2008-01-20 at 16:01:16ID: 20703034

Hi sdstuber,

here is the file:

SITE_ASSET_ID,MONP_CODE,FTYP_CODE,MEA_CODE,REA_DT_PRIMARY,REA_VALUE,REA_ORIGIN,QI
100448,1,MTR,CONN,20070728080000,16.288,odca,V
100448,1,MTR,CONN,20070729080000,20.032,odca,V
100448,1,MTR,CONN,20070730080000,21.032,odca,V
100448,1,MTR,CONN,20070731080000,18.496,odca,V
100448,1,MTR,CONN,20070801080000,20.48,odca,V
100448,1,MTR,CONN,20070802080000,15.086,odca,V
100448,1,MTR,CONN,20070803080000,15.086,odca,V
100448,1,MTR,CONN,20070804080000,15.086,odca,V
100448,1,MTR,CONN,20070805080000,15.086,odca,V
100448,1,MTR,CONN,20070806080000,15.086,odca,V
100448,1,MTR,CONN,20070807080000,15.086,odca,V
100448,1,MTR,CONN,20070808080000,15.086,odca,V
100448,1,MTR,CONN,20070809080000,15.086,odca,V
100448,1,MTR,CONN,20070810080000,24.03866667,odca,V
100448,1,MTR,CONN,20070811080000,24.03866667,odca,V
100448,1,MTR,CONN,20070813080000,24.03866667,odca,V
100448,1,MTR,CONN,20070814080000,24.03866667,odca,V
100448,1,MTR,CONN,20070815080000,24.03866667,odca,V
100448,1,MTR,CONN,20070816080000,24.03866667,odca,V
100448,1,MTR,CONN,20070817080000,23.35866667,odca,V
100448,1,MTR,CONN,20070818080000,23.35866667,odca,V
100448,1,MTR,CONN,20070820080000,23.35866667,odca,V
100448,1,MTR,CONN,20070821080000,23.35866667,odca,V
100448,1,MTR,CONN,20070822080000,23.35866667,odca,V
100448,1,MTR,CONN,20070823080000,23.35866667,odca,V
100448,1,MTR,CONN,20070824080000,23.35866667,odca,V
100448,1,MTR,CONN,20070825080000,23.35866667,odca,V
100448,1,MTR,CONN,20070826080000,23.35866667,odca,V
100448,1,MTR,CONN,20070827080000,23.35866667,odca,V
100448,1,MTR,CONN,20070828080000,23.35866667,odca,V
100448,1,MTR,CONN,20070829080000,23.35866667,odca,V
100448,1,MTR,CONN,20070830080000,23.35866667,odca,V
100448,1,MTR,CONN,20070831080000,24.472,odca,V
100448,1,MTR,CONN,20070901080000,24.472,odca,V
100448,1,MTR,CONN,20070902080000,24.472,odca,V
100448,1,MTR,CONN,20070903080000,24.472,odca,V
100448,1,MTR,CONN,20070904080000,24.472,odca,V
100448,1,MTR,CONN,20070905080000,24.472,odca,V
100448,1,MTR,CONN,20070906080000,27.1152,odca,V
100448,1,MTR,CONN,20070907080000,27.1152,odca,V
100448,1,MTR,CONN,20070908080000,27.1152,odca,V
100448,1,MTR,CONN,20070909080000,27.1152,odca,V
100448,1,MTR,CONN,20070912080000,27.1152,odca,V
100448,1,MTR,CONN,20070913080000,25.13942857,odca,V
100448,1,MTR,CONN,20070914080000,25.13942857,odca,V
100448,1,MTR,CONN,20070915080000,25.13942857,odca,V
100448,1,MTR,CONN,20070916080000,25.13942857,odca,V
100448,1,MTR,CONN,20070917080000,25.13942857,odca,V
100448,1,MTR,CONN,20070918080000,25.13942857,odca,V
100448,1,MTR,CONN,20070919080000,25.13942857,odca,V

kindest regards
darrylf290567

GABinFixaq2.txt
- 2 KB
a comma delimited file

by: sdstuberPosted on 2008-01-20 at 18:07:54ID: 20703427

CREATE OR REPLACE DIRECTORY CSV_IMPORT_DIR AS 'your_directory_path_here';

GRANT READ, WRITE ON DIRECTORY CSV_IMPORT_DIR TO 'your_schema_here';

CREATE OR REPLACE PROCEDURE read_csv(p_filename IN VARCHAR2)
IS
v_filehandle UTL_FILE.file_type;
v_text VARCHAR2(4000);
v_eof BOOLEAN := FALSE;
v_temp VARCHAR2(100);
v_site_asset_id NUMBER;
v_monp_code NUMBER;
v_ftyp_code VARCHAR2(3);
v_mea_code VARCHAR2(4);
v_rea_dt_primary DATE;
v_rea_value NUMBER;
v_rea_origin VARCHAR2(4);
v_qi VARCHAR2(1);
BEGIN
v_filehandle := UTL_FILE.fopen('CSV_IMPORT_DIR', p_filename, 'r');

BEGIN
-- read header line
-- do nothing with the text
UTL_FILE.get_line(v_filehandle, v_text);
EXCEPTION
WHEN NO_DATA_FOUND
THEN
v_eof := TRUE;
END;

WHILE NOT v_eof
LOOP
BEGIN
UTL_FILE.get_line(v_filehandle, v_text);
v_text := TRIM(v_text);

IF v_text IS NOT NULL
THEN
-- Extract 1st element
v_temp := SUBSTR(v_text, 1, INSTR(v_text, ',', 1, 1) - 1);
v_site_asset_id := TO_NUMBER(v_temp);
-- Extract 2nd element
v_temp :=
SUBSTR(v_text,
INSTR(v_text, ',', 1, 1) + 1,
INSTR(v_text, ',', 1, 2) - 1 - INSTR(v_text, ',', 1, 1)
);
v_monp_code := TO_NUMBER(v_temp);
-- Extract 3rd element
v_temp :=
SUBSTR(v_text,
INSTR(v_text, ',', 1, 2) + 1,
INSTR(v_text, ',', 1, 3) - 1 - INSTR(v_text, ',', 1, 2)
);
v_ftyp_code := v_temp;
-- Extract 4th element
v_temp :=
SUBSTR(v_text,
INSTR(v_text, ',', 1, 3) + 1,
INSTR(v_text, ',', 1, 4) - 1 - INSTR(v_text, ',', 1, 3)
);
v_mea_code := v_temp;
-- Extract 5th element
v_temp :=
SUBSTR(v_text,
INSTR(v_text, ',', 1, 4) + 1,
INSTR(v_text, ',', 1, 5) - 1 - INSTR(v_text, ',', 1, 4)
);
v_rea_dt_primary := TO_DATE(v_temp, 'yyyymmddhh24miss');
-- Extract 6th element
v_temp :=
SUBSTR(v_text,
INSTR(v_text, ',', 1, 5) + 1,
INSTR(v_text, ',', 1, 6) - 1 - INSTR(v_text, ',', 1, 5)
);
v_rea_value := TO_NUMBER(v_temp);
-- Extract 7th element
v_temp :=
SUBSTR(v_text,
INSTR(v_text, ',', 1, 6) + 1,
INSTR(v_text, ',', 1, 7) - 1 - INSTR(v_text, ',', 1, 6)
);
v_rea_origin := v_temp;
-- Extract last element
v_temp := SUBSTR(v_text, INSTR(v_text, ',', 1, 7) + 1);
v_qi := v_temp;

-- Do something with the data...
DBMS_OUTPUT.put_line('v_site_asset_id: ' || v_site_asset_id);
DBMS_OUTPUT.put_line('v_monp_code: ' || v_monp_code);
DBMS_OUTPUT.put_line('v_ftyp_code: ' || v_ftyp_code);
DBMS_OUTPUT.put_line('v_mea_code: ' || v_mea_code);
DBMS_OUTPUT.put_line('v_rea_dt_primary: ' || v_rea_dt_primary);
DBMS_OUTPUT.put_line('v_rea_value: ' || v_rea_value);
DBMS_OUTPUT.put_line('v_rea_origin: ' || v_rea_origin);
DBMS_OUTPUT.put_line('v_qi: ' || v_qi);
DBMS_OUTPUT.put_line('------------------------------------------------------------------');
END IF;
EXCEPTION
WHEN NO_DATA_FOUND
THEN
v_eof := TRUE;
WHEN OTHERS
THEN
DBMS_OUTPUT.put_line('*************************************************************');
DBMS_OUTPUT.put_line(SQLERRM);
DBMS_OUTPUT.put_line(v_text);
DBMS_OUTPUT.put_line(v_temp);
DBMS_OUTPUT.put_line('*************************************************************');
END;
END LOOP;

UTL_FILE.fclose(v_filehandle);
RETURN;
EXCEPTION
WHEN OTHERS
THEN
IF UTL_FILE.is_open(v_filehandle)
THEN
UTL_FILE.fclose(v_filehandle);
END IF;

RAISE;
END read_csv;

by: sdstuberPosted on 2008-01-20 at 20:31:17ID: 20703897

Can I ask, why only a "B"? what else did you need?

by: darrylf290567Posted on 2008-01-23 at 01:08:51ID: 20721837

hi sdstuber,

What about if the data is using comma as the delimiter BUT the data in each column is shorter or longer is there a way that we can write a generic PLSQL to handle all comma delimited files with varying data column sizes.

Please can you help
darrylf290567

by: sdstuberPosted on 2008-01-23 at 04:37:31ID: 20722757

The code I sent above doesn't consider fixed length data. It adjusts for every element. When you extract the data you have to put it "somewhere" so your variables need to be large enough to handle the biggest possible field. I defined the v_xxxxxx variables to match the data I saw in your examples but for unknown data I would increase the varchar2 variables to 32767

by: darrylf290567Posted on 2008-01-23 at 15:17:53ID: 20728993

Hi sdstuber,

What I mean by a generic csv reader is that when the PLSQL code is reading the data it might start of identifying that the first comma is at position 6 (meaning that the data is 5 characters in length before the comma) in the first line. Whereas another csv file will have the first comma on the first line positioned at position 9 (meaning that the data is 8 characters in length before the comma). Can the code in your answer that you have supplied to me handle these issues?

Can you please help sdstuber? I really appreciate this.

data file:
SITE_ASSET_ID,MONP_CODE,FTYP_CODE,MEA_CODE,REA_DT_PRIMARY,REA_VALUE,REA_CREATED_BY,REA_ORIGIN
101007,w4,STO,OPTIMUM,20070704120000,112800,GDI,Excel
101007,w4,STO,OPTIMUM,20070711120000,119900,GDI,Excel
101007,w4,STO,OPTIMUM,20070718120000,128400,GDI,Excel
101007,w4,STO,OPTIMUM,20070725120000,137900,GDI,Excel
101007,w4,STO,OPTIMUM,20070801120000,148400,GDI,Excel
101007,w4,STO,OPTIMUM,20070808120000,158000,GDI,Excel
101007,w4,STO,OPTIMUM,20070815120000,167900,GDI,Excel
101007,w4,STO,OPTIMUM,20070822120000,177900,GDI,Excel
101007,w4,STO,OPTIMUM,20070829120000,187600,GDI,Excel
101007,w4,STO,OPTIMUM,20070905120000,192400,GDI,Excel
101007,w4,STO,OPTIMUM,20070912120000,197000,GDI,Excel
101007,w4,STO,OPTIMUM,20070919120000,202500,GDI,Excel
101007,w4,STO,OPTIMUM,20070926120000,208300,GDI,Excel
101007,w4,STO,OPTIMUM,20071003120000,213900,GDI,Excel
101007,w4,STO,OPTIMUM,20071010120000,218000,GDI,Excel
101007,w4,STO,OPTIMUM,20071017120000,222900,GDI,Excel
101007,w4,STO,OPTIMUM,20071024120000,227600,GDI,Excel
101007,w4,STO,OPTIMUM,20071031120000,232100,GDI,Excel
101007,w4,STO,OPTIMUM,20071107120000,233900,GDI,Excel
101007,w4,STO,OPTIMUM,20071114120000,234800,GDI,Excel

data file 2:
SITE_ASSET_ID,MONP_CODE,FTYP_CODE,MEA_CODE,REA_DT_PRIMARY,REA_VALUE,REA_ORIGIN
17101,2,PWR,PMRKW,20000718120000,27788,SR693596
17101,2,PWR,PMRKW,20000818120000,27866,SR693596
17101,2,PWR,PMRKW,20000918120000,27913,SR693596
17101,2,PWR,PMRKW,20001018120000,28094,SR693596
17101,2,PWR,PMRKW,20001101120000,28224,SR693596
17101,2,PWR,PMRKW,20001108120000,28285,SR693596
17101,2,PWR,PMRKW,20001114120000,28340,SR693596
17101,2,PWR,PMRKW,20001122120000,28432,SR693596
17101,2,PWR,PMRKW,20001129120000,28538,SR693596
17101,2,PWR,PMRKW,20001205120000,28605,SR693596
17101,2,PWR,PMRKW,20001213120000,28695,SR693596

data file 3:
Site,mp,fac,meas,Reading Date,TARCON,origin
9714,1,MTR,TARCON,20070701120000,93035,SR695367
9714,1,MTR,TARCON,20070702120000,93035,SR695367
9714,1,MTR,TARCON,20070703120000,93035,SR695367
9714,1,MTR,TARCON,20070704120000,93035,SR695367
9714,1,MTR,TARCON,20070705120000,93035,SR695367
9714,1,MTR,TARCON,20070706120000,93035,SR695367
9714,1,MTR,TARCON,20070707120000,93035,SR695367
9714,1,MTR,TARCON,20070708120000,93035,SR695367
9714,1,MTR,TARCON,20070709120000,93035,SR695367
9714,1,MTR,TARCON,20070710120000,93035,SR695367
9714,1,MTR,TARCON,20070711120000,93035,SR695367

Kindest Regards
darrylf290567

by: sdstuberPosted on 2008-01-23 at 16:17:54ID: 20729436

You can't do dynamic variable declarations, so you can't create a 5-char variable for one file and 9-char variable for another file.

You can create a 32767-char variable and then read whatever you want.

The code I sent doesn't care how long the data is. Change all my variables to 32767 and it'll work for any file (up to 32767, of course)

If, you're looking for something that will enforce size rules on an entire file based on the contents of the first line of that file, that's something different. It's possible, post a new question with all of the rules you're looking for. I'll try to get to it sometime tonight or early tomorrow morning.

by: sdstuberPosted on 2008-01-23 at 16:19:26ID: 20729458

I am still curious as to why you only scored a "B", didn't I answer what you asked? Maybe not what you wanted, but what you asked?

The standard is supposed to "A" grade, with B and C denoting degrees of failure. If my answer failed, I'd like to know why.

by: darrylf290567Posted on 2008-01-23 at 16:55:34ID: 20729669

Hi sdstuber,

I do apologise but you did deserve an A grade. I msinterpreted the marking system and I apologise.

I will post another question right now.

kind regards
darrylf290567

20120131-EE-VQP-002

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Reading a csv file using plsql oracle 10g

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