{"id":14079,"date":"2024-03-15T08:25:17","date_gmt":"2024-03-15T08:25:17","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-does-oracle-read-a-value-from-a-blob-field\/"},"modified":"2025-08-06T03:30:52","modified_gmt":"2025-08-06T03:30:52","slug":"how-does-oracle-read-a-value-from-a-blob-field","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-does-oracle-read-a-value-from-a-blob-field\/","title":{"rendered":"Read Oracle BLOB: Step-by-Step Guide"},"content":{"rendered":"<p>In Oracle database, you can use either PL\/SQL language or SQL queries to read the value of a BLOB field.<\/p>\n<ol>\n<li>Declare a variable to store the value of the BLOB field.<\/li>\n<li>Use the SELECT INTO statement to assign the value of the BLOB field to a variable.<\/li>\n<li>Utilize subprograms from the DBMS_LOB package to handle BLOB values, such as using the GETLENGTH function to retrieve the length of the BLOB and using the READ function to read the content of the BLOB.<\/li>\n<\/ol>\n<p>Here is a sample code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">DECLARE<\/span>\r\n   my_blob <span class=\"hljs-type\">BLOB<\/span>;\r\n   my_blob_length <span class=\"hljs-type\">INTEGER<\/span>;\r\n   my_blob_content VARCHAR2(<span class=\"hljs-number\">32767<\/span>);\r\n<span class=\"hljs-keyword\">BEGIN<\/span>\r\n   <span class=\"hljs-keyword\">SELECT<\/span> blob_column <span class=\"hljs-keyword\">INTO<\/span> my_blob <span class=\"hljs-keyword\">FROM<\/span> my_table <span class=\"hljs-keyword\">WHERE<\/span> id <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">1<\/span>;\r\n   \r\n   my_blob_length :<span class=\"hljs-operator\">=<\/span> DBMS_LOB.GETLENGTH(my_blob);\r\n   DBMS_OUTPUT.PUT_LINE(<span class=\"hljs-string\">'Blob Length: '<\/span> <span class=\"hljs-operator\">||<\/span> my_blob_length);\r\n   \r\n   DBMS_LOB.READ(my_blob, my_blob_length, <span class=\"hljs-number\">1<\/span>, my_blob_content);\r\n   DBMS_OUTPUT.PUT_LINE(<span class=\"hljs-string\">'Blob Content: '<\/span> <span class=\"hljs-operator\">||<\/span> my_blob_content);\r\n<span class=\"hljs-keyword\">END<\/span>;\r\n<span class=\"hljs-operator\">\/<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Retrieve the value of a BLOB field using the SELECT statement and enclose it in an appropriate function, such as TO_BLOB or UTL_RAW.CAST_TO_RAW.<\/li>\n<li>You can utilize subprograms in the DBMS_LOB package to handle BLOB values, such as using the DBMS_LOB.GETLENGTH function to retrieve the length of a BLOB and the DBMS_LOB.READ function to read the content of a BLOB.<\/li>\n<\/ol>\n<p>Here is a sample code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> DBMS_LOB.GETLENGTH(blob_column) <span class=\"hljs-keyword\">AS<\/span> blob_length,\r\n       UTL_RAW.CAST_TO_VARCHAR2(DBMS_LOB.SUBSTR(blob_column, DBMS_LOB.GETLENGTH(blob_column), <span class=\"hljs-number\">1<\/span>)) <span class=\"hljs-keyword\">AS<\/span> blob_content\r\n<span class=\"hljs-keyword\">FROM<\/span> my_table\r\n<span class=\"hljs-keyword\">WHERE<\/span> id <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">1<\/span>;\r\n<\/code><\/pre>\n<p>You can retrieve the value of a BLOB field using either PL\/SQL or SQL queries. The specific method to use depends on your requirements and environment.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Oracle database, you can use either PL\/SQL language or SQL queries to read the value of a BLOB field. Declare a variable to store the value of the BLOB field. Use the SELECT INTO statement to assign the value of the BLOB field to a variable. Utilize subprograms from the DBMS_LOB package to handle [&hellip;]<\/p>\n","protected":false},"author":11,"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":[9309,13803,813,321,1845],"class_list":["post-14079","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-dbms_lob","tag-oracle-blob","tag-oracle-database","tag-pl-sql","tag-sql-queries"],"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>Read Oracle BLOB: Step-by-Step Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to read BLOB values in Oracle using SQL, PL\/SQL, and DBMS_LOB with practical examples.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-does-oracle-read-a-value-from-a-blob-field\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Read Oracle BLOB: Step-by-Step Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how to read BLOB values in Oracle using SQL, PL\/SQL, and DBMS_LOB with practical examples.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-does-oracle-read-a-value-from-a-blob-field\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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