Wiki source code of velocityHqlExamples
Version 21.1 by Vincent Massol on 2009/09/08
Show last authors
| author | version | line-number | content |
|---|---|---|---|
| 1 | {{box cssClass="floatinginfobox" title="**Contents**"}}{{toc start="2" depth="4"/}}{{/box}} | ||
| 2 | |||
| 3 | = HQL Query Examples in Velocity = | ||
| 4 | |||
| 5 | XWiki allows user to access documents and objects with [[HQL>>http://www.hibernate.org/hib_docs/reference/en/html/queryhql.html]] queries in [[Velocity>>http://jakarta.apache.org/velocity/docs/user-guide.html]] scripts. | ||
| 6 | |||
| 7 | General example showing how to display the first 5 results of a given query: | ||
| 8 | |||
| 9 | {{code language="none"}} | ||
| 10 | #set($hql="<query here>") | ||
| 11 | #set($results = $xwiki.searchDocuments($hql, 5, 0)) | ||
| 12 | #foreach ($item in $results) | ||
| 13 | * $item | ||
| 14 | #end | ||
| 15 | {{/code}} | ||
| 16 | |||
| 17 | The examples below will show you various HQL queries that you can write. | ||
| 18 | |||
| 19 | == Public API (##searchDocuments##) == | ||
| 20 | |||
| 21 | {{velocity}}{{html}} | ||
| 22 | #info("With this API the query consist in the WHERE condition of a full HQL query. Any user with edit rights can write a script using this API. Any user with view rights can view the result of such a query.") | ||
| 23 | {{/html}}{{/velocity}} | ||
| 24 | |||
| 25 | === Simple Query === | ||
| 26 | |||
| 27 | Displays all documents who have been created by the user ##XWiki.JohnDoe##: | ||
| 28 | |||
| 29 | {{code language="none"}} | ||
| 30 | #set($hql = "where doc.creator='XWiki.JohnDoe'") | ||
| 31 | {{/code}} | ||
| 32 | |||
| 33 | === Ordered Query === | ||
| 34 | |||
| 35 | Displays all documents who have been created by the user ##XWiki.JohnDoe## and sorted by document's last modification date, in ascending order: | ||
| 36 | |||
| 37 | {{code language="none"}} | ||
| 38 | #set($hql = "where doc.creator='XWiki.VincentMassol' order by doc.date asc") | ||
| 39 | {{/code}} | ||
| 40 | |||
| 41 | === Advanced Query (date & time) === | ||
| 42 | |||
| 43 | {{velocity}}{{html wiki="true"}} | ||
| 44 | #info("Since there is no [[standard way to calculate dates interval in HQL>>http://opensource.atlassian.com/projects/hibernate/browse/HHH-2434]] those queries are a bit unnatural.") | ||
| 45 | {{/html}}{{/velocity}} | ||
| 46 | |||
| 47 | {{code language="none"}} | ||
| 48 | #set($hql = "where year(doc.date) = year(current_date()) and month(doc.date) = month(current_date()) and day(doc.date) = day(current_date()) and hour(doc.date) > (hour(current_time()) - 1) order by doc.date desc") | ||
| 49 | {{/code}} | ||
| 50 | |||
| 51 | Other examples: | ||
| 52 | * Listing all documents modified during the current day: {{code language="none"}}where year(doc.date) = year(current_date()) and month(doc.date) = month(current_date()) and day(doc.date) > (day(current_date()) - 1) order by doc.date desc{{/code}} | ||
| 53 | * Listing all documents modified during the current week: {{code language="none"}}where year(doc.date) = year(current_date()) and month(doc.date) = month(current_date()) and day(doc.date) > (day(current_date()) - 7) order by doc.date desc{{/code}} | ||
| 54 | * Listing all documents modified during the current month: {{code language="none"}}where year(doc.date) = year(current_date()) and month(doc.date) > (month(current_date()) - 1) order by doc.date desc{{/code}} | ||
| 55 | |||
| 56 | == Privileged API (##search##: Documents, Objects, Properties, etc) == | ||
| 57 | |||
| 58 | {{velocity}}{{html}} | ||
| 59 | #warning("Calls to te privileged API are only executed when the calling page has been saved by a user with Programming Rights. The reason is that search can be used to send dangerous HQL command like update, delete, etc.") | ||
| 60 | {{/html}}{{/velocity}} | ||
| 61 | |||
| 62 | === Simple Query === | ||
| 63 | |||
| 64 | {{code language="none"}} | ||
| 65 | #set($hql = "select doc.name from XWikiDocument doc") | ||
| 66 | {{/code}} | ||
| 67 | |||
| 68 | === Count Query === | ||
| 69 | |||
| 70 | {{code language="none"}} | ||
| 71 | #set($results = $xwiki.search("select count(doc) from XWikiDocument doc")) | ||
| 72 | ## Since $xwiki.search is returning a list, we get its first element | ||
| 73 | Count : $results.get(0) | ||
| 74 | {{/code}} | ||
| 75 | |||
| 76 | === Simple Query with multiple fields === | ||
| 77 | |||
| 78 | {{code language="none"}} | ||
| 79 | #set($results = $xwiki.search("select doc.name, doc.date from XWikiDocument doc", 5, 0)) | ||
| 80 | #foreach ($row in $results) | ||
| 81 | #foreach ($col in $row) | ||
| 82 | #if ($velocityCount == 1) | ||
| 83 | #set($docName = $col) | ||
| 84 | #elseif ($velocityCount == 2) | ||
| 85 | #set($docDate = $col) | ||
| 86 | #end | ||
| 87 | #end | ||
| 88 | $docName : $docDate <br/> | ||
| 89 | #end | ||
| 90 | {{/code}} | ||
| 91 | |||
| 92 | === Getting objects of a specific class === | ||
| 93 | |||
| 94 | {{code language="none"}} | ||
| 95 | #set($hql = "select obj.name from BaseObject obj where obj.className='XWiki.XWikiUsers'") | ||
| 96 | {{/code}} | ||
| 97 | |||
| 98 | === Getting objects' properties === | ||
| 99 | |||
| 100 | {{code language="none"}} | ||
| 101 | #set($hql = "select obj.name, prop.value from BaseObject obj, StringProperty prop where obj.className='XWiki.XWikiUsers' and prop.id.id=obj.id and prop.name='first_name'") | ||
| 102 | {{/code}} | ||
| 103 | |||
| 104 | === Getting documents where objects' properties equals some value === | ||
| 105 | |||
| 106 | {{code language="none"}} | ||
| 107 | #set($hql = "select doc.fullName from XWikiDocument doc, BaseObject obj, StringProperty prop where doc.fullName=obj.name and obj.className='XWiki.XWikiUsers' and prop.id.id=obj.id and prop.name='first_name' and prop.value='Jean-Vincent'") | ||
| 108 | {{/code}} | ||
| 109 | |||
| 110 | === List users currently editing pages === | ||
| 111 | |||
| 112 | {{code language="none"}} | ||
| 113 | #set($hql = "select distinct lock.userName from XWikiLock lock") | ||
| 114 | {{/code}} | ||
| 115 | |||
| 116 | === List attachments of a page === | ||
| 117 | |||
| 118 | {{code language="none"}} | ||
| 119 | #set($hql = "select att.filename from XWikiAttachment att, XWikiDocument doc where doc.fullName='Main.WebHome' and att.docId=doc.id") | ||
| 120 | {{/code}} | ||
| 121 | |||
| 122 | == Non-exhaustive list of queryable Object Fields == | ||
| 123 | |||
| 124 | === XWikiDocument === | ||
| 125 | |||
| 126 | * **XWikiDocument.fullName** : full name, including space and page name. Example value: ##Main.WebHome## | ||
| 127 | * XWikiDocument.author : last editor. Example value: ##XWiki.Admin## | ||
| 128 | * XWikiDocument.creator : first editor. Example value: ##XWiki.Admin## | ||
| 129 | |||
| 130 | === BaseObject === | ||
| 131 | |||
| 132 | * **BaseObject.id** : arbitrary unique id of the object. Example value: ##123456789## | ||
| 133 | * BaseObject.className : class. Example value: ##XWiki.XWikiUsers## | ||
| 134 | |||
| 135 | === *Property (StringProperty, IntegerProperty, etc) === | ||
| 136 | |||
| 137 | * **Property.id.id** : unique id of the object the property belongs to. Example value: ##123456789## | ||
| 138 | * Property.name : name of the property. Example value: ##first_name## | ||
| 139 | * Property.value : value. Example value: ##John## |
