Reg: Analysis BLOB and download in rows and columns-
Hi Experts,
I have a requirement, that I met him, but isn't a very good approach. You will appreciate your suggestions on this.
There is a column of type BLOB, when a CSV file is downloaded using the interface of the APEX. I am the analysis and break the BLOB i.e. CSV values using regular expressions and insert rows in table for later use in n columns.
Note: The downloaded CSV file assumes the maximum of 50 columns.
Like this:
-/ / Convert BLOB on the CLOB type
() DBMS_LOB.converttoclob
v_clob, v_blob,
DBMS_LOB. LOBMAXSIZE,
v_dest_offset, v_src_offset,
v_blob_csid, v_lang_context, g_msg
);
-/ / Find total no of records
l_length: = DBMS_LOB.getlength (v_clob);
l_records: = (l_length-LENGTH (REPLACE (v_clob, CHR (10))) + 1;)
BECAUSE me IN 1.l_records
LOOP
v_pos1: = CASE WHEN (i = 1) THEN 1 ELSE (DBMS_LOB. InStr (v_clob, Chr (10), 1, i-1)) END;
v_pos2: = CASE WHEN (I = l_records) AND (l_length) ELSE (DBMS_LOB. InStr (v_clob, Chr (10), 1, i));
v_substr: =.
(BOX WHEN i = 1 THEN
DBMS_LOB. SUBSTR (lob_loc = > v_clob, amount = >(v_pos2-v_pos1), offset = > 1)
ON THE OTHER
DBMS_LOB. SUBSTR (lob_loc = > v_clob, amount = >(v_pos2-v_pos1)-1, offset = > v_pos1 + 1)
END );
-----------------------------------------------------------
-/ / The data in each row are still divided into separate columns
-----------------------------------------------------------
insert_table. EXTEND();
insert_table (insert_table..) (Sqid LAST): = i;
insert_table (insert_table. LAST) .c001: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,]*)',1,1,'i',2);
insert_table (insert_table. LAST) .c002: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,]*)',1,2,'i',2);
insert_table (insert_table. LAST) .c003: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,]*)',1,3,'i',2);
insert_table (insert_table. LAST) .c004: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,]*)',1,4,'i',2);
insert_table (insert_table. LAST) .c005: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,]*)',1,5,'i',2);
insert_table (insert_table. LAST) .c006: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,]*)',1,6,'i',2);
insert_table (insert_table. LAST) .c007: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,]*)',1,7,'i',2);
insert_table (insert_table. LAST) .c008: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,]*)',1,8,'i',2);
insert_table (insert_table. LAST) .c009: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,]*)',1,9,'i',2);
insert_table (insert_table. LAST) .c010: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 10, « i », 2) ;
--
insert_table (insert_table. LAST) .c011: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 11, « i », 2) ;
insert_table (insert_table. LAST) .c012: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 12, « i », 2) ;
insert_table (insert_table. LAST) .c013: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 13, « i », 2) ;
insert_table (insert_table. LAST) .c014: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 14, « i », 2) ;
insert_table (insert_table. LAST) .c015: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 15, « i », 2) ;
insert_table (insert_table. LAST) .c016: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 16, « i », 2) ;
insert_table (insert_table. LAST) .c017: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 17, « i », 2) ;
insert_table (insert_table. LAST) .c018: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 18, « i », 2) ;
insert_table (insert_table. LAST) .c019: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 19, « i », 2) ;
insert_table (insert_table. LAST) .c020: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 20, « i », 2) ;
--
insert_table (insert_table. LAST) .c021: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 21, « i », 2) ;
insert_table (insert_table. LAST) .c022: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 22, « i », 2) ;
insert_table (insert_table. LAST) .c023: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 23, « i », 2) ;
insert_table (insert_table. LAST) .c024: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 24, « i », 2) ;
insert_table (insert_table. LAST) .c025: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 25, « i », 2) ;
insert_table (insert_table. LAST) .c026: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 26, « i », 2) ;
insert_table (insert_table. LAST) .c027: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 27, « i », 2) ;
insert_table (insert_table. LAST) .c028: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 28, « i », 2) ;
insert_table (insert_table. LAST) .c029: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 29, « i », 2) ;
insert_table (insert_table. LAST) .c030: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 30, « i », 2) ;
--
insert_table (insert_table. LAST) .c031: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 31, « i », 2) ;
insert_table (insert_table. LAST) .c032: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 32, « i », 2) ;
insert_table (insert_table. LAST) .c033: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 33, « i », 2) ;
insert_table (insert_table. LAST) .c034: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 34, « i », 2) ;
insert_table (insert_table. LAST) .c035: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 35, « i », 2) ;
insert_table (insert_table. LAST) .c036: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 36, « i », 2) ;
insert_table (insert_table. LAST) .c037: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 37, « i », 2) ;
insert_table (insert_table. LAST) .c038: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 38, « i », 2) ;
insert_table (insert_table. LAST) .c039: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 39, « i », 2) ;
insert_table (insert_table. LAST) .c040: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 40, « i », 2) ;
--
insert_table (insert_table. LAST) .c041: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 41, « i », 2) ;
insert_table (insert_table. LAST) .c042: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 42, « i », 2) ;
insert_table (insert_table. LAST) .c043: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 43, « i », 2) ;
insert_table (insert_table. LAST) .c044: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 44, « i », 2) ;
insert_table (insert_table. LAST) .c045: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 45, « i », 2) ;
insert_table (insert_table. LAST) .c046: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 46, « i », 2) ;
insert_table (insert_table. LAST) .c047: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 47, « i », 2) ;
insert_table (insert_table. LAST) .c048: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 48, « i », 2) ;
insert_table (insert_table. LAST) .c049: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 49, « i », 2) ;
insert_table (insert_table. LAST) .c050: = REGEXP_SUBSTR (v_substr,'(^|,?) ([^,] *)', 1, 50, « i », 2) ;
-----------------------------------------------------
END LOOP;
Data entry example:
998,9012238422,600454892,,7/1/2014,337555.11,493.06,,545.21,,,2,1104.93,,,563.5,,,1.75,100,,M,3,545.21,,7/8/2014,337555.11,0,0,,0,,338100.32,338100.32,
998,9044033,656848127,,7/1/2014,104269.9,533.3,,163.09,,,6.5,726.88,,,565.68,,,6.128,100,,M,3,163.09,,7/8/2014,104269.9,0,0,,0,,104432.99,104432.99,
998,2011011,426985586,,1/1/2013,74134.99,380.78,,236.58,,,6.5,520.82,,,805.06,,,6.144,100,,M,3,236.58,,7/2/2014,74134.99,0,0,,0,,74371.57,74371.57,
Please notify.
Let me know if you need some other information about it.
Thank you and best regards,
Nordine
(on Oracle 11.2.0.3.0)
Writing the BLOB in the disc and using an external table are likely to be more effective.
Disadvantage: you must serialize the process to ensure that simultaneous sessions do not alter the location of the external file.
A function in Java-based pipeline could also be an option, or even a custom parser csv (free regex) written in PL/SQL.
Tags: Database
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