We can split a string into substrings using PL/SQL built in functions SUBSTR(), INSTR() and LENGTH() together.

Follwing code snippets helps you in splitting a string into substrings.

Snippet to split string into pieces:::

CREATE OR REPLACE FUNCTION func_str_split(str_to_split IN OUT VARCHAR2
,str_delimiter IN VARCHAR2) RETURN VARCHAR2
IS
t_pos NUMBER;
t_len NUMBER;
t_strlen NUMBER;
t_strresult VARCHAR2(2000);
BEGIN
t_strresult := NULL;
IF str_to_split IS NOT NULL THEN
t_len := LENGTH(str_delimiter);
t_strlen := LENGTH(str_to_split);
t_pos := INSTR(str_to_split,str_delimiter);
IF t_pos > 0 THEN
t_strresult := SUBSTR(str_to_split,1,t_pos-1);
str_to_split := SUBSTR(str_to_split,t_pos+t_len,t_strlen);
ELSE
t_strresult := str_to_split;
str_to_split := NULL;
END IF;
END IF;
RETURN t_strresult;
END func_str_split;

Use following procedure to call above function:::

CREATE OR REPLACE PROCEDURE proc_str_split(str_to_split IN OUT VARCHAR2
,str_delimiter IN VARCHAR2)
IS
declare

END proc_str_split;

Here is a sample PL/SQL procedure which can read a file from a specified location, into a BLOB and returns it.

The calling program can convert this blob data into any form.

Calling program can be another PL/SQL procedure or a Java Program or some other language program.

Note: following procedure works only on Oracle Database.

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create or replace procedure READ_FILE_TO_BLOB(

dest_lob_return OUT BLOB,

file_name IN VARCHAR2)

is

    – BFILE_LOC is the directory created, with help of

    –create directory BFILE_LOC as ‘/export/home/test/d01/oratst/testcomn/admin/out/TEST_xxxxxxr06/’;

    src_lob  BFILE := BFILENAME(‘BFILE_LOC’, file_name); 

    dest_lob BLOB;

    v_lob_len INTEGER;

    v_offset NUMBER := 1;

    v_buffer       RAW(20);

    v_buffer_size  BINARY_INTEGER := 20;

BEGIN

   DBMS_LOB.CREATETEMPORARY(dest_lob, TRUE, DBMS_LOB.SESSION);

   DBMS_LOB.OPEN(src_lob, DBMS_LOB.LOB_READONLY);

   DBMS_LOB.LoadFromFile( DEST_LOB => dest_lob,

                          SRC_LOB  => src_lob,

                          AMOUNT   => DBMS_LOB.GETLENGTH(src_lob) );

   DBMS_LOB.CLOSE(src_lob);

   dest_lob_return := dest_lob;

end READ_FILE_TO_BLOB;

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