Fix Oracle BLOB to String Garbled Characters

In Oracle databases, BLOB data is typically stored as binary data. When converting BLOB data to a string, there may be garbled characters. To address this issue, you can use the TO_CLOB function in the DBMS_LOB package provided by Oracle to convert BLOB data to CLOB type data, and then convert CLOB data to a string.

Here is an example code:

DECLARE
    l_blob BLOB;
    l_clob CLOB;
    l_str VARCHAR2(32767);
BEGIN
    -- 获取BLOB数据
    SELECT blob_column
    INTO l_blob
    FROM your_table
    WHERE your_condition;

    -- 将BLOB数据转换为CLOB数据
    DBMS_LOB.CREATETEMPORARY(l_clob, TRUE);
    DBMS_LOB.CONVERTTOCLOB(l_clob, l_blob, DBMS_LOB.LOBMAXSIZE);

    -- 将CLOB数据转换为字符串
    l_str := DBMS_LOB.SUBSTR(l_clob, DBMS_LOB.GETLENGTH(l_clob), 1);

    -- 打印字符串
    DBMS_OUTPUT.PUT_LINE(l_str);

    -- 释放资源
    DBMS_LOB.FREETEMPORARY(l_clob);
END;
/

By using the above code, you can convert BLOB data to a string and avoid encoding issues. If encoding problems persist, it may be due to mismatched database character sets or incorrect data storage methods, so please check the database character set settings and data storage methods.