{"id":10913,"date":"2024-03-14T13:00:01","date_gmt":"2024-03-14T13:00:01","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-garbled-characters-when-converting-a-blob-to-a-string-in-oracle\/"},"modified":"2025-08-04T05:25:30","modified_gmt":"2025-08-04T05:25:30","slug":"how-to-resolve-the-issue-of-garbled-characters-when-converting-a-blob-to-a-string-in-oracle","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-garbled-characters-when-converting-a-blob-to-a-string-in-oracle\/","title":{"rendered":"Fix Oracle BLOB to String Garbled Characters"},"content":{"rendered":"<p>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.<\/p>\n<p>Here is an example code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">DECLARE<\/span>\r\n    l_blob <span class=\"hljs-type\">BLOB<\/span>;\r\n    l_clob <span class=\"hljs-type\">CLOB<\/span>;\r\n    l_str VARCHAR2(<span class=\"hljs-number\">32767<\/span>);\r\n<span class=\"hljs-keyword\">BEGIN<\/span>\r\n    <span class=\"hljs-comment\">-- \u83b7\u53d6BLOB\u6570\u636e<\/span>\r\n    <span class=\"hljs-keyword\">SELECT<\/span> blob_column\r\n    <span class=\"hljs-keyword\">INTO<\/span> l_blob\r\n    <span class=\"hljs-keyword\">FROM<\/span> your_table\r\n    <span class=\"hljs-keyword\">WHERE<\/span> your_condition;\r\n\r\n    <span class=\"hljs-comment\">-- \u5c06BLOB\u6570\u636e\u8f6c\u6362\u4e3aCLOB\u6570\u636e<\/span>\r\n    DBMS_LOB.CREATETEMPORARY(l_clob, <span class=\"hljs-literal\">TRUE<\/span>);\r\n    DBMS_LOB.CONVERTTOCLOB(l_clob, l_blob, DBMS_LOB.LOBMAXSIZE);\r\n\r\n    <span class=\"hljs-comment\">-- \u5c06CLOB\u6570\u636e\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32<\/span>\r\n    l_str :<span class=\"hljs-operator\">=<\/span> DBMS_LOB.SUBSTR(l_clob, DBMS_LOB.GETLENGTH(l_clob), <span class=\"hljs-number\">1<\/span>);\r\n\r\n    <span class=\"hljs-comment\">-- \u6253\u5370\u5b57\u7b26\u4e32<\/span>\r\n    DBMS_OUTPUT.PUT_LINE(l_str);\r\n\r\n    <span class=\"hljs-comment\">-- \u91ca\u653e\u8d44\u6e90<\/span>\r\n    DBMS_LOB.FREETEMPORARY(l_clob);\r\n<span class=\"hljs-keyword\">END<\/span>;\r\n<span class=\"hljs-operator\">\/<\/span>\r\n<\/code><\/pre>\n<p>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.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>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 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[13820,13803,813,472,13821],"class_list":["post-10913","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-blob-conversion","tag-oracle-blob","tag-oracle-database","tag-oracle-sql","tag-to_clob-function"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Fix Oracle BLOB to String Garbled Characters - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Resolve garbled characters when converting BLOB to string in Oracle using TO_CLOB function. 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