{"id":14087,"date":"2024-03-15T08:25:59","date_gmt":"2024-03-15T08:25:59","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-can-we-convert-an-oracle-blob-into-a-string\/"},"modified":"2025-08-06T03:37:36","modified_gmt":"2025-08-06T03:37:36","slug":"how-can-we-convert-an-oracle-blob-into-a-string","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-we-convert-an-oracle-blob-into-a-string\/","title":{"rendered":"Convert Oracle BLOB to String: Methods & Code"},"content":{"rendered":"

There are several methods to convert an Oracle BLOB to a string.<\/p>\n

    \n
  1. Utilize Oracle’s built-in package: You can use the functions within the DBMS_LOB package to convert a BLOB to a string. For example, you can use the DBMS_LOB.SUBSTR function to extract a portion of the BLOB and convert it to a string. Below is an example code:<\/li>\n<\/ol>\n
    DECLARE<\/span>\r\n  l_blob BLOB<\/span>;\r\n  l_clob CLOB<\/span>;\r\n  l_offset NUMBER :=<\/span> 1<\/span>;\r\n  l_amount NUMBER :=<\/span> 32767<\/span>;\r\n  l_buffer VARCHAR2(32767<\/span>);\r\nBEGIN<\/span>\r\n  -- \u4ece\u8868\u4e2d\u83b7\u53d6BLOB\u6570\u636e<\/span>\r\n  SELECT<\/span> blob_column INTO<\/span> l_blob FROM<\/span> my_table WHERE<\/span> id =<\/span> 1<\/span>;\r\n  \r\n  -- \u5c06BLOB\u8f6c\u6362\u4e3aCLOB<\/span>\r\n  DBMS_LOB.CREATETEMPORARY(l_clob, TRUE<\/span>);\r\n  DBMS_LOB.CONVERTTOCLOB(l_clob, l_blob, l_amount, l_offset, 1<\/span>);\r\n  \r\n  -- \u9010\u6b65\u8bfb\u53d6CLOB\u5e76\u5c06\u5176\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32<\/span>\r\n  LOOP\r\n    EXIT WHEN<\/span> l_offset ><\/span> DBMS_LOB.GETLENGTH(l_clob);\r\n    DBMS_LOB.READ(l_clob, l_amount, l_offset, l_buffer);\r\n    -- \u5728\u6b64\u5904\u53ef\u4ee5\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5904\u7406<\/span>\r\n    DBMS_OUTPUT.PUT_LINE(l_buffer);\r\n    l_offset :=<\/span> l_offset +<\/span> l_amount;\r\n  END<\/span> LOOP;\r\n  \r\n  -- \u91ca\u653eCLOB<\/span>\r\n  DBMS_LOB.FREETEMPORARY(l_clob);\r\nEND<\/span>;\r\n<\/code><\/pre>\n
      \n
    1. You can convert a BLOB to a string using PL\/SQL code. Here is an example code:<\/li>\n<\/ol>\n
      DECLARE<\/span>\r\n  l_blob BLOB<\/span>;\r\n  l_clob CLOB<\/span>;\r\n  l_offset NUMBER :=<\/span> 1<\/span>;\r\n  l_amount NUMBER :=<\/span> 32767<\/span>;\r\n  l_buffer VARCHAR2(32767<\/span>);\r\nBEGIN<\/span>\r\n  -- \u4ece\u8868\u4e2d\u83b7\u53d6BLOB\u6570\u636e<\/span>\r\n  SELECT<\/span> blob_column INTO<\/span> l_blob FROM<\/span> my_table WHERE<\/span> id =<\/span> 1<\/span>;\r\n  \r\n  -- \u5c06BLOB\u9010\u6b65\u8f6c\u6362\u4e3aCLOB<\/span>\r\n  WHILE l_offset <=<\/span> DBMS_LOB.GETLENGTH(l_blob) LOOP\r\n    l_buffer :=<\/span> UTL_RAW.CAST_TO_VARCHAR2(DBMS_LOB.SUBSTR(l_blob, l_amount, l_offset));\r\n    -- \u5728\u6b64\u5904\u53ef\u4ee5\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5904\u7406<\/span>\r\n    DBMS_OUTPUT.PUT_LINE(l_buffer);\r\n    l_offset :=<\/span> l_offset +<\/span> l_amount;\r\n  END<\/span> LOOP;\r\nEND<\/span>;\r\n<\/code><\/pre>\n
        \n
      1. External tools can be used to export BLOB data, such as PL\/SQL Developer, and save it as a file. The file can then be opened with a text editor or other tools, and the contents copied into a string. This method is relatively simple, but requires the use of additional tools.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
        There are several methods to convert an Oracle BLOB to a string. Utilize Oracle’s built-in package: You can use the functions within the DBMS_LOB package to convert a BLOB to a string. For example, you can use the DBMS_LOB.SUBSTR function to extract a portion of the BLOB and convert it to a string. Below is […]<\/p>\n","protected":false},"author":13,"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":[13820,9309,13803,2941,12787],"class_list":["post-14087","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-blob-conversion","tag-dbms_lob","tag-oracle-blob","tag-oracle-data-types","tag-oracle-string-conversion"],"yoast_head":"\nConvert Oracle BLOB to String: Methods & Code - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to convert Oracle BLOB to string using DBMS_LOB. 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