{"id":74,"date":"2012-11-01T17:16:00","date_gmt":"2012-11-01T22:16:00","guid":{"rendered":"https:\/\/www.chrystalsander.com\/blog\/?p=74"},"modified":"2023-07-26T12:37:52","modified_gmt":"2023-07-26T17:37:52","slug":"sql-server-use-xquery-on-xml-data-types","status":"publish","type":"post","link":"https:\/\/www.chrystalsander.com\/blog\/?p=74","title":{"rendered":"SQL Server : Use XQuery On XML Data Types"},"content":{"rendered":"
\n
\n
\nXQuery is to XML what SQL is to database tables.   XQuery is designed to query XML data – not just XML files, but anything that can appear as XML, including databases.  In SQL Server, there are five methods that you can use to speed up your xquery to a column of type \u201cxml:\u201d  query(), value(), exist(), modify(), and nodes().  I\u2019ll cover the first, and most commonly used, three.<\/o:p><\/span><\/div>\n
\nFor the purpose of this example, I will use the following sample xml in field \u201cXmlField :\u201d<\/o:p><\/span><\/div>\n
\n<\/div>\n
\n<<\/span>msg<\/span>><\/o:p><\/span><\/div>\n
\n  <<\/span>head<\/span>>   <\/o:p><\/span><\/div>\n
\n    <<\/span>Id<\/span>><\/span>X9356G356Y<\/<\/span>Id<\/span>><\/o:p><\/span><\/span><\/div>\n
\n  <\/<\/span>head<\/span>><\/o:p><\/span><\/div>\n
\n  <<\/span>body<\/span>><\/o:p><\/span><\/div>\n
\n    <<\/span>ReturnedResponse<\/span>><\/o:p><\/span><\/div>\n
\n      <<\/span>Response<\/span>><\/o:p><\/span><\/div>\n
\n        <<\/span>ReturnCode<\/span>><\/span>0<\/<\/span>ReturnCode<\/span>>       <\/o:p><\/span><\/span><\/div>\n
\n        <<\/span>Message<\/span>><\/span>SUCCESS<\/<\/span>Message<\/span>><\/o:p><\/span><\/span><\/div>\n
\n      <\/<\/span>Response<\/span>>     <\/o:p><\/span><\/div>\n
\n      <<\/span>Customer<\/span>><\/o:p><\/span><\/div>\n
\n   <<\/span>CustomerId<\/span>><\/span>CID459283<\/<\/span>CustomerId<\/span>><\/span><\/span><\/div>\n
\n        <<\/span>State<\/span>><\/span>NV<\/<\/span>State<\/span>><\/o:p><\/span><\/span><\/div>\n
\n <<\/span>Name<\/span>><\/span><\/br>  <<\/span>FirstLast<\/span>><\/span>Name1_Name2 <\/<\/span>FirstLast<\/span>><\/span><\/span><\/div>\n
\n        <\/<\/span>Name<\/span>><\/o:p><\/span><\/div>\n
\n      <\/<\/span>Customer<\/span>><\/o:p><\/span><\/div>\n
\n    <\/<\/span>ReturnedResponse<\/span>><\/o:p><\/span><\/div>\n
\n  <\/<\/span>body<\/span>><\/o:p><\/span><\/div>\n
\n<\/<\/span>msg<\/span>><\/o:p><\/span><\/div>\n
\n<\/div>\n
\n–XPATH Examples<\/o:p><\/span><\/div>\n
\n<\/div>\n
\n–.value<\/o:p><\/span><\/div>\n
\nSELECT<\/span>  A.<\/span>TransDate,<\/span> A.<\/span>MainId,<\/o:p><\/span><\/span><\/div>\n
\nXmlField.<\/span>value(<\/span>‘\/msg[1]\/body[1]\/ReturnedResponse[1]\/Customer[1]\/CustomerId[1]’<\/span>,<\/span> ‘VARCHAR(25)’<\/span>)<\/span> as<\/span> xCustomerId<\/o:p><\/span><\/div>\n
\nFROM<\/span> TABLE2 B WITH <\/span>(<\/span>NOLOCK<\/span>)<\/o:p><\/span><\/span><\/div>\n
\nINNER<\/span> JOIN<\/span> TABLE1 A WITH <\/span>(<\/span>NOLOCK<\/span>)<\/span> ON<\/span> B.<\/span>APk =<\/span> A.<\/span>MainId<\/o:p><\/span><\/div>\n
\nWHERE<\/o:p><\/span><\/div>\n
\nA.<\/span>MainId =<\/span> ‘HI05491882’<\/span><\/span><\/div>\n
\n<\/div>\n
\n–.exist<\/o:p><\/span><\/div>\n
\nSELECT<\/span>  A.<\/span>TransDate,<\/span> A.<\/span>MainId,<\/o:p><\/span><\/span><\/div>\n
\nXmlField.<\/span>value(<\/span>‘\/msg[1]\/body[1]\/ReturnedResponse[1]\/Customer[1]\/CustomerId[1]’<\/span>,<\/span> ‘VARCHAR(25)’<\/span>)<\/span> as<\/span> xCustomerId<\/o:p><\/span><\/div>\n
\nFROM<\/span> TABLE2 B WITH <\/span>(<\/span>NOLOCK<\/span>)<\/o:p><\/span><\/span><\/div>\n
\nINNER<\/span> JOIN<\/span> TABLE1 A WITH <\/span>(<\/span>NOLOCK<\/span>)<\/span> ON<\/span> B.<\/span>APk =<\/span> A.<\/span>MainId<\/o:p><\/span><\/div>\n
\nWHERE<\/o:p><\/span><\/div>\n
\nA.<\/span>MainId =<\/span> ‘HI05491882’<\/o:p><\/span><\/span><\/div>\n
\nAND<\/span> XmlField.<\/span>exist(<\/span>‘\/msg\/body\/ReturnedResponse\/Customer\/CustomerId’<\/span>)<\/span> =<\/span> 1<\/o:p><\/span><\/div>\n
\n<\/div>\n
\n–.query<\/o:p><\/span><\/div>\n
\nSELECT<\/span> XmlField.<\/span>query(<\/span>‘\/msg\/body\/ReturnedResponse\/Customer\/CustomerId’<\/span>)<\/o:p><\/span><\/span><\/div>\n
\nFROM<\/span> TABLE2 B WITH <\/span>(<\/span>NOLOCK<\/span>)<\/o:p><\/span><\/span><\/div>\n
\nINNER<\/span> JOIN<\/span> TABLE1 A WITH <\/span>(<\/span>NOLOCK<\/span>)<\/span> ON<\/span> B.<\/span>APk =<\/span> A.<\/span>MainId<\/o:p><\/span><\/div>\n
\nWHERE<\/o:p><\/span><\/div>\n
\nA.<\/span>MainId =<\/span> ‘HI05491882’<\/span><\/o:p><\/span><\/span><\/div>\n
\n<\/div>\n
\n<\/div>\n
\n<\/div>\n<\/div>\n

<\/div>\n","protected":false},"excerpt":{"rendered":"

XQuery is to XML what SQL is to database tables.   XQuery is designed to query XML data – not just XML files, but anything that can appear as XML, including databases.  In SQL Server, there are five methods that you can use to speed up your xquery to a column of type \u201cxml:\u201d  query(), value(), … Continue reading “SQL Server : Use XQuery On XML Data Types”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27,34],"tags":[50],"_links":{"self":[{"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/74"}],"collection":[{"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=74"}],"version-history":[{"count":1,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/74\/revisions"}],"predecessor-version":[{"id":192,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/74\/revisions\/192"}],"wp:attachment":[{"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=74"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=74"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chrystalsander.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=74"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}