{"id":14912,"date":"2022-11-10T15:55:19","date_gmt":"2022-11-10T18:55:19","guid":{"rendered":"https:\/\/dev.dbarj.com.br\/?p=14912"},"modified":"2022-11-11T11:25:40","modified_gmt":"2022-11-11T14:25:40","slug":"oracle-ords-returns-raw-columns-as-base64-encoding","status":"publish","type":"post","link":"https:\/\/dev.dbarj.com.br\/en\/2022\/11\/oracle-ords-returns-raw-columns-as-base64-encoding\/","title":{"rendered":"Oracle ORDS returns RAW columns as base64 encoding"},"content":{"rendered":"<p>Those days, I was building a REST API service for retrieving the columns of a checksum table.<\/p>\n<p>The table structure was pretty simple:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\">CREATE TABLE \"DEMO\" (\r\n  \"PATH\"     VARCHAR2(500 CHAR),\r\n  \"MD5_HASH\" RAW(16)\r\n);\r\n\r\nINSERT INTO DEMO (\r\n  PATH,\r\n  MD5_HASH\r\n) VALUES (\r\n  'bundle.xml',\r\n  '70D53BE37073B31347EE42B622EA4A75'\r\n);\r\n\r\nCOMMIT;<\/pre>\n<p>So, as you can see, very simple table with a path to a file and its checksum.<\/p>\n<p>Now, create a simple ORDS service to just show the table contents:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">BEGIN\r\n\r\n  ORDS.DEFINE_MODULE(\r\n      p_module_name    =&gt; 'test',\r\n      p_base_path      =&gt; '\/test\/',\r\n      p_items_per_page =&gt; 25,\r\n      p_status         =&gt; 'PUBLISHED',\r\n      p_comments       =&gt; NULL);\r\n\r\n  ORDS.DEFINE_TEMPLATE(\r\n      p_module_name    =&gt; 'test',\r\n      p_pattern        =&gt; 'test',\r\n      p_priority       =&gt; 0,\r\n      p_etag_type      =&gt; 'HASH',\r\n      p_etag_query     =&gt; NULL,\r\n      p_comments       =&gt; NULL);\r\n\r\n  ORDS.DEFINE_HANDLER(\r\n      p_module_name    =&gt; 'test',\r\n      p_pattern        =&gt; 'test',\r\n      p_method         =&gt; 'GET',\r\n      p_source_type    =&gt; 'json\/collection',\r\n      p_items_per_page =&gt; 25,\r\n      p_mimes_allowed  =&gt; NULL,\r\n      p_comments       =&gt; NULL,\r\n      p_source         =&gt; 'SELECT * FROM DEMO');\r\n        \r\n  COMMIT;\r\n\r\nEND;\r\n\/<\/pre>\n<p>And now, getting the data from the endpoint:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">$ curl -s -S -k --request GET https:\/\/xxx.yyy.zzz.adb.us-phoenix-1.oraclevcn.com\/ords\/test\/test\/test | jq\r\n{\r\n  \"items\": [\r\n    {\r\n      \"path\": \"bundle.xml\",\r\n      \"md5_hash\": \"cNU743BzsxNH7kK2IupKdQ==\"\r\n    }\r\n  ],\r\n  \"hasMore\": false,\r\n  \"limit\": 25,\r\n  \"offset\": 0,\r\n  \"count\": 1,\r\n  \"links\": [\r\n    {\r\n      \"rel\": \"self\",\r\n      \"href\": \"https:\/\/xxx.yyy.zzz.adb.us-phoenix-1.oraclevcn.com\/ords\/test\/test\/test\"\r\n    },\r\n    {\r\n      \"rel\": \"describedby\",\r\n      \"href\": \"https:\/\/xxx.yyy.zzz.adb.us-phoenix-1.oraclevcn.com\/ords\/test\/metadata-catalog\/test\/item\"\r\n    },\r\n    {\r\n      \"rel\": \"first\",\r\n      \"href\": \"https:\/\/xxx.yyy.zzz.adb.us-phoenix-1.oraclevcn.com\/ords\/test\/test\/test\"\r\n    }\r\n  ]\r\n}<\/pre>\n<p>So, as you can see, the column md5_hash was converted from <span style=\"font-family: courier new, courier, monospace;\">70D53BE37073B31347EE42B622EA4A75<\/span> to <span style=\"font-family: courier new, courier, monospace;\">cNU743BzsxNH7kK2IupKdQ==<\/span>.<\/p>\n<p>Why? In the <a href=\"https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-rest-data-services\/19.1\/aelig\/ords-database-type-mappings.html#GUID-4F7FA58A-1C29-4B7E-819F-21DB4B68FFE1\" target=\"_blank\" rel=\"noopener\">official doc<\/a>, you can see:<\/p>\n<p id=\"tYzoFlm\"><img loading=\"lazy\" decoding=\"async\" width=\"2010\" height=\"846\" class=\"alignnone size-full wp-image-14915 \" src=\"https:\/\/dev.dbarj.com.br\/wp-content\/uploads\/2022\/11\/img_636d46821a9b9.png\" alt=\"\" srcset=\"https:\/\/dev.dbarj.com.br\/wp-content\/uploads\/2022\/11\/img_636d46821a9b9.png 2010w, https:\/\/dev.dbarj.com.br\/wp-content\/uploads\/2022\/11\/img_636d46821a9b9-300x126.png 300w, https:\/\/dev.dbarj.com.br\/wp-content\/uploads\/2022\/11\/img_636d46821a9b9-1024x431.png 1024w, https:\/\/dev.dbarj.com.br\/wp-content\/uploads\/2022\/11\/img_636d46821a9b9-768x323.png 768w, https:\/\/dev.dbarj.com.br\/wp-content\/uploads\/2022\/11\/img_636d46821a9b9-1536x646.png 1536w, https:\/\/dev.dbarj.com.br\/wp-content\/uploads\/2022\/11\/img_636d46821a9b9-870x366.png 870w\" sizes=\"auto, (max-width: 2010px) 100vw, 2010px\" \/><\/p>\n<p>So this is expected. The reason RAWs are converted is mainly that the base64 needs 1.33 characters per byte. Hex encoding requires 2 characters per byte. Base64 is the common encoding of binary values transported as text in various protocols.<\/p>\n<p>How do we convert back? If using shell, you could simply:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"shell\">$ echo \"cNU743BzsxNH7kK2IupKdQ==\" | base64 -d | hexdump -v -e '\/1 \"%02X\"'\r\n70D53BE37073B31347EE42B622EA4A75<\/pre>\n<p>Now, what if instead, you want to make ORDS <span style=\"text-decoration: underline;\"><strong>not<\/strong><\/span> convert RAW to BASE64?<\/p>\n<p>The only way to do that is if in the SQL layer you return a VARCHAR2 instead of a RAW, and this can be easily achievable through the <a href=\"https:\/\/docs.oracle.com\/en\/database\/oracle\/oracle-database\/21\/sqlrf\/RAWTOHEX.html\" target=\"_blank\" rel=\"noopener\">RAWTOHEX<\/a> function.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\">BEGIN\r\n\r\n  ORDS.DEFINE_HANDLER(\r\n      p_module_name    =&gt; 'test',\r\n      p_pattern        =&gt; 'test',\r\n      p_method         =&gt; 'GET',\r\n      p_source_type    =&gt; 'json\/collection',\r\n      p_items_per_page =&gt; 25,\r\n      p_mimes_allowed  =&gt; NULL,\r\n      p_comments       =&gt; NULL,\r\n      p_source         =&gt; 'SELECT PATH, RAWTOHEX(MD5_HASH) MD5_HASH FROM DEMO');\r\n        \r\n  COMMIT;\r\n\r\nEND;\r\n\/<\/pre>\n<p>And finally, getting the data from the endpoint:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">$ curl -s -S -k --request GET https:\/\/xxx.yyy.zzz.adb.us-phoenix-1.oraclevcn.com\/ords\/test\/test\/test | jq\r\n{\r\n  \"items\": [\r\n    {\r\n      \"path\": \"bundle.xml\",\r\n      \"md5_hash\": \"70D53BE37073B31347EE42B622EA4A75\"\r\n    }\r\n  ],\r\n  \"hasMore\": false,\r\n  \"limit\": 25,\r\n  \"offset\": 0,\r\n  \"count\": 1,\r\n  \"links\": [\r\n    {\r\n      \"rel\": \"self\",\r\n      \"href\": \"https:\/\/xxx.yyy.zzz.adb.us-phoenix-1.oraclevcn.com\/ords\/test\/test\/test\"\r\n    },\r\n    {\r\n      \"rel\": \"describedby\",\r\n      \"href\": \"https:\/\/xxx.yyy.zzz.adb.us-phoenix-1.oraclevcn.com\/ords\/test\/metadata-catalog\/test\/item\"\r\n    },\r\n    {\r\n      \"rel\": \"first\",\r\n      \"href\": \"https:\/\/xxx.yyy.zzz.adb.us-phoenix-1.oraclevcn.com\/ords\/test\/test\/test\"\r\n    }\r\n  ]\r\n}<\/pre>\n<b>Have you enjoyed? Please leave a comment or give a ?!<\/b>\n<div class='watch-action'><div class='watch-position align-left'><div class='action-like'><a class='lbg-style2 like-14912 jlk' href='javascript:void(0)' data-task='like' data-post_id='14912' data-nonce='b7aaf4ff99' rel='nofollow'><img class='wti-pixel' src='https:\/\/dev.dbarj.com.br\/wp-content\/plugins\/wti-like-post\/images\/pixel.gif' title='Like' \/><span class='lc-14912 lc'>+2<\/span><\/a><\/div><\/div> <div class='status-14912 status align-left'><\/div><\/div><div class='wti-clear'><\/div>","protected":false},"excerpt":{"rendered":"<p>Those days, I was building a REST API service for retrieving the columns of a checksum table. The table structure was pretty simple: CREATE TABLE &#8220;DEMO&#8221; ( &#8220;PATH&#8221; VARCHAR2(500 CHAR), &#8220;MD5_HASH&#8221; RAW(16) ); INSERT INTO DEMO ( PATH, MD5_HASH ) VALUES ( &#8216;bundle.xml&#8217;, &#8217;70D53BE37073B31347EE42B622EA4A75&#8242; ); COMMIT; So, as you can see, very simple table with &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"https:\/\/dev.dbarj.com.br\/en\/2022\/11\/oracle-ords-returns-raw-columns-as-base64-encoding\/\">Continue reading<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-14912","post","type-post","status-publish","format-standard","hentry","category-database-en","item-wrap"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Oracle ORDS returns RAW columns as base64 encoding - 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