{"id":2395,"date":"2014-05-09T11:00:20","date_gmt":"2014-05-09T15:00:20","guid":{"rendered":"http:\/\/sqlity.net\/en\/?p=2395"},"modified":"2014-11-13T12:27:17","modified_gmt":"2014-11-13T17:27:17","slug":"cert_id","status":"publish","type":"post","link":"https:\/\/sqlity.net\/en\/2395\/cert_id\/","title":{"rendered":"How to Drop a Certificate Conditionally with CERT_ID"},"content":{"rendered":"
\n

Introduction<\/h3>\n

\nSometimes you need to be able to determine if a particular certificate exists already. For example, automated deployment scripts are a place where this functionality is commonly required. You could use the sys.certificates<\/span> catalog view<\/a> to get that information. But there is an even simpler way: CERT_ID()<\/span>.\n<\/p>\n

CERT_ID() Example<\/h3>\n

\nThe built-in CERT_ID()<\/span> function takes one parameter, the name of the certificate. Its primary function is to return SQL Server's internal certificate_id<\/span> for the certificate specified in the name parameter:\n<\/p>\n

\n[sql]\nSELECT CERT_ID('ACertificate');
\n[\/sql]\n<\/div>\n

\nThe output of this function is an integer value:\n<\/p>\n

\n\"CERT_ID<\/a>\n<\/p>\n

\nThis integer value represents the certificate_id<\/span>, if a certificate with that name exists in the current database. Otherwise, NULL<\/span> is returned. That fact however we can use to check for existence.\n<\/p>\n

\nIf we want to drop a certificate automatically if it exists, for example as part of a deployment script, we can use CERT_ID<\/span> in an IF<\/span> statement like this:\n<\/p>\n

\n[sql]\nIF(CERT_ID('ACertificate') IS NOT NULL) DROP CERTIFICATE ACertificate;
\n[\/sql]\n<\/div>\n

\nIf the certificate ACertificate<\/span> exists, CERT_ID<\/span> returns a non-NULL value and the DROP<\/span> statement is executed. If it does not exist, the DROP<\/span> statement is skipped.\n<\/p>\n

Summary<\/h3>\n

\nSQL Server's built-in CERT_ID()<\/span> function returns the internal certificate_id<\/span> of a certificate in the current database. Since it returns NULL<\/span> if the specified certificate does not exist, it can be used to execute statements conditionally based on the existence of a certificate.\n<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Discover how CERT_ID can be used to conditionally execute statements (like a drop or create) based on the existence of a specific certificate, since it returns a noon-NULL value only if the certificate exists.<\/p>\n

[more…]<\/a><\/p>\n","protected":false},"author":3,"featured_media":2396,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[32,5,34],"tags":[180,49,181,273,38,15],"class_list":["post-2395","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cryptography","category-general","category-security","tag-built-in-function","tag-certificates","tag-conditional-drop","tag-cryptography","tag-security-2","tag-sql-server"],"acf":[],"yoast_head":"\nHow to Drop a Certificate Conditionally with CERT_ID - 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