30 lines
973 B
MySQL
30 lines
973 B
MySQL
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CREATE OR REPLACE FUNCTION base64decode(p_clob CLOB)
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RETURN BLOB
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-- -----------------------------------------------------------------------------------
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-- File Name : https://oracle-base.com/dba/miscellaneous/base64decode.sql
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-- Author : Tim Hall
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-- Description : Decodes a Base64 CLOB into a BLOB
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-- Last Modified: 09/11/2011
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-- -----------------------------------------------------------------------------------
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IS
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l_blob BLOB;
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l_raw RAW(32767);
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l_amt NUMBER := 7700;
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l_offset NUMBER := 1;
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l_temp VARCHAR2(32767);
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BEGIN
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BEGIN
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DBMS_LOB.createtemporary (l_blob, FALSE, DBMS_LOB.CALL);
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LOOP
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DBMS_LOB.read(p_clob, l_amt, l_offset, l_temp);
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l_offset := l_offset + l_amt;
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l_raw := UTL_ENCODE.base64_decode(UTL_RAW.cast_to_raw(l_temp));
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DBMS_LOB.append (l_blob, TO_BLOB(l_raw));
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END LOOP;
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EXCEPTION
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WHEN NO_DATA_FOUND THEN
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NULL;
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END;
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RETURN l_blob;
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END;
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/
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