我需要将base64编码为clob。我做了一些搜索和相同的功能似乎被建议:base64将clob编码为blob
CREATE OR REPLACE FUNCTION base64encode(p_blob IN BLOB)
RETURN CLOB
-- -----------------------------------------------------------------------------------
-- File Name : https://oracle-base.com/dba/miscellaneous/base64encode.sql
-- Author : Tim Hall
-- Description : Encodes a BLOB into a Base64 CLOB.
-- Last Modified: 09/11/2011
-- -----------------------------------------------------------------------------------
IS
l_clob CLOB;
l_step PLS_INTEGER := 12000; -- make sure you set a multiple of 3 not higher than 24573
BEGIN
FOR i IN 0 .. TRUNC((DBMS_LOB.getlength(p_blob) - 1)/l_step) LOOP
l_clob := l_clob || UTL_RAW.cast_to_varchar2(UTL_ENCODE.base64_encode(DBMS_LOB.substr(p_blob, l_step, i * l_step + 1)));
END LOOP;
RETURN l_clob;
END;
/
我的问题是,什么决定的l_step
的最大尺寸是多少?我尝试将其设置为24573,我收到以下错误:
ORA-06502: PL/SQL: numeric or value error: raw variable length too long, ORA-06512: at "SYS.UTL_ENCODE"
我试着将它设置为23808,似乎工作。
完全正确,很明显,函数'UTL_RAW.CAST_TO_VARCHAR2'返回受限于32767个字节的'VARCHAR2'数据类型。由于'UTL_ENCODE.base64_encode'返回纯ASCII,所以限制等于32767个字符。多字节字符转换不适用。 –