Wiki source code of velocityHqlExamples
Version 27.1 by flavius on 2011/12/08
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| author | version | line-number | content |
|---|---|---|---|
| 1 | {{box cssClass="floatinginfobox" title="**Contents**"}} | ||
| 2 | {{toc start="2" depth="4"/}} | ||
| 3 | {{/box}} | ||
| 4 | |||
| 5 | = HQL Query Examples in Velocity = | ||
| 6 | |||
| 7 | XWiki allows user to access documents and objects with [[HQL>>http://docs.jboss.org/hibernate/stable/core/reference/en/html/queryhql.html]] queries in [[Velocity>>http://jakarta.apache.org/velocity/docs/user-guide.html]] scripts. | ||
| 8 | |||
| 9 | == Public API (##searchDocuments##) == | ||
| 10 | |||
| 11 | {{velocity}} | ||
| 12 | {{html}} | ||
| 13 | #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.") | ||
| 14 | {{/html}} | ||
| 15 | {{/velocity}} | ||
| 16 | |||
| 17 | General example showing how to display the first 5 results of a given query: | ||
| 18 | |||
| 19 | {{code language="none"}} | ||
| 20 | #set($hql = "<query here>") | ||
| 21 | #set($results = $xwiki.searchDocuments($hql, 5, 0)) | ||
| 22 | #foreach ($item in $results) | ||
| 23 | * $item | ||
| 24 | #end | ||
| 25 | {{/code}} | ||
| 26 | |||
| 27 | The examples below will show you various HQL queries that you can write. | ||
| 28 | |||
| 29 | === Simple Query === | ||
| 30 | |||
| 31 | Displays all documents who have been created by the user ##XWiki.JohnDoe##: | ||
| 32 | |||
| 33 | {{code language="none"}} | ||
| 34 | #set($hql = "where doc.creator='XWiki.JohnDoe'") | ||
| 35 | {{/code}} | ||
| 36 | |||
| 37 | === Ordered Query === | ||
| 38 | |||
| 39 | Displays all documents who have been created by the user ##XWiki.JohnDoe## and sorted by document's last modification date, in ascending order: | ||
| 40 | |||
| 41 | {{code language="none"}} | ||
| 42 | #set($hql = "where doc.creator='XWiki.VincentMassol' order by doc.date asc") | ||
| 43 | {{/code}} | ||
| 44 | |||
| 45 | === Advanced Query (date & time) === | ||
| 46 | |||
| 47 | {{velocity}} | ||
| 48 | {{html wiki="true"}} | ||
| 49 | #info("Since there is no [[standard way to calculate dates interval in HQL>>http://opensource.atlassian.com/projects/hibernate/browse/HHH-2434]] those queries are a bit unnatural.") | ||
| 50 | {{/html}} | ||
| 51 | {{/velocity}} | ||
| 52 | |||
| 53 | {{code language="none"}} | ||
| 54 | #set($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") | ||
| 55 | {{/code}} | ||
| 56 | |||
| 57 | Other examples: | ||
| 58 | |||
| 59 | * 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}} | ||
| 60 | * 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}} | ||
| 61 | * 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}} | ||
| 62 | * Comparing two dates: {{code language="none"}}where ((year(date1) > year(date2) OR (year(date1) = year(date2) AND month(date1) > month(date2)) OR (year(date1) = year(date2) AND month(date1) = month(date2) AND day(date1) >= day(date2)){{/code}} | ||
| 63 | |||
| 64 | == Privileged API (##search##) == | ||
| 65 | |||
| 66 | {{velocity}} | ||
| 67 | {{html wiki="true"}} | ||
| 68 | #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.") | ||
| 69 | {{/html}} | ||
| 70 | {{/velocity}} | ||
| 71 | |||
| 72 | General example showing how to display the first 5 results of a given query: | ||
| 73 | |||
| 74 | {{code language="none"}} | ||
| 75 | #set($hql = "<query here>") | ||
| 76 | #set($results = $xwiki.search($hql, 5, 0)) | ||
| 77 | #foreach ($item in $results) | ||
| 78 | * $item | ||
| 79 | #end | ||
| 80 | {{/code}} | ||
| 81 | |||
| 82 | The examples below will show you various HQL queries that you can write. | ||
| 83 | |||
| 84 | === Simple Query === | ||
| 85 | |||
| 86 | {{code language="none"}} | ||
| 87 | #set($hql = "select doc.name from XWikiDocument doc") | ||
| 88 | {{/code}} | ||
| 89 | |||
| 90 | === Count Query === | ||
| 91 | |||
| 92 | {{code language="none"}} | ||
| 93 | #set($results = $xwiki.search("select count(doc) from XWikiDocument doc")) | ||
| 94 | ## Since $xwiki.search is returning a list, we get its first element | ||
| 95 | Count : $results.get(0) | ||
| 96 | {{/code}} | ||
| 97 | |||
| 98 | === Simple Query with multiple fields === | ||
| 99 | |||
| 100 | {{code language="none"}} | ||
| 101 | #set($results = $xwiki.search("select doc.name, doc.date from XWikiDocument doc", 5, 0)) | ||
| 102 | #foreach ($row in $results) | ||
| 103 | #foreach ($col in $row) | ||
| 104 | #if ($velocityCount == 1) | ||
| 105 | #set($docName = $col) | ||
| 106 | #elseif ($velocityCount == 2) | ||
| 107 | #set($docDate = $col) | ||
| 108 | #end | ||
| 109 | #end | ||
| 110 | $docName : $docDate <br/> | ||
| 111 | #end | ||
| 112 | {{/code}} | ||
| 113 | |||
| 114 | === Getting objects of a specific class === | ||
| 115 | |||
| 116 | {{code language="none"}} | ||
| 117 | #set($hql = "select obj.name from BaseObject obj where obj.className='XWiki.XWikiUsers'") | ||
| 118 | {{/code}} | ||
| 119 | |||
| 120 | === Getting objects' properties === | ||
| 121 | |||
| 122 | {{code language="none"}} | ||
| 123 | #set($hql = "select obj.name, prop.value from BaseObject obj, StringProperty prop where obj.className='XWiki.XWikiUsers' and prop.id.id=obj.id and prop.name='first_name'") | ||
| 124 | {{/code}} | ||
| 125 | |||
| 126 | === Getting documents where objects' properties equals some value === | ||
| 127 | |||
| 128 | {{code language="none"}} | ||
| 129 | #set($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'") | ||
| 130 | {{/code}} | ||
| 131 | |||
| 132 | {{code language="none"}} | ||
| 133 | #set($hql = ", BaseObject as obj, StringProperty as firstName, StringProperty as lastName where doc.fullName = obj.name and obj.className='XWiki.XWikiUsers' and obj.id=firstName.id.id and firstName.id.name='first_name' and obj.id=lastName.id.id and lastName.id.name='last_name' and firstName.value like 'A%' and lastName.value like 'B%' order by doc.fullName asc") | ||
| 134 | {{/code}} | ||
| 135 | |||
| 136 | === List users currently editing pages === | ||
| 137 | |||
| 138 | {{code language="none"}} | ||
| 139 | #set($hql = "select distinct lock.userName from XWikiLock lock") | ||
| 140 | {{/code}} | ||
| 141 | |||
| 142 | === List attachments of a page === | ||
| 143 | |||
| 144 | {{code language="none"}} | ||
| 145 | #set($hql = "select att.filename from XWikiAttachment att, XWikiDocument doc where doc.fullName='Main.WebHome' and att.docId=doc.id") | ||
| 146 | {{/code}} | ||
| 147 | |||
| 148 | === Statistics === | ||
| 149 | |||
| 150 | * [[Most Viewed Articles Snippet>>extensions:Extension.Most Viewed Articles]] | ||
| 151 | * [[Most Active Contributors In Group Snippet>>extensions:Extension.Most Active Contributors In Group]] | ||
| 152 | * [[Number Of Active Users Per Day And Per Week Snippet>>extensions:Extension.Number Of Active Users Per Day And Per Week]] | ||
| 153 | * [[Number Of Edited Articles Per Day And Per Week Snippet>>extensions:Extension.Number Of Edited Articles Per Day And Per Week]] | ||
| 154 | * [[Number Of Created Articles Per Day And Per Week Snippet>>extensions:Extension.Number Of Created Articles Per Day And Per Week]] | ||
| 155 | * [[Number Of Deleted Articles Per Day And Per Week Snippet>>extensions:Extension.Number Of Deleted Articles Per Day And Per Week]] | ||
| 156 | |||
| 157 | == Non-exhaustive list of queryable Object Fields == | ||
| 158 | |||
| 159 | The full list of available fields can be found in the Hibernate mapping files (*.hbm.xml), which can be found inside WEB-INF/lib/xwiki-core-x.y.jar (where x.y is the XWiki version). | ||
| 160 | |||
| 161 | === XWikiDocument === | ||
| 162 | |||
| 163 | * **XWikiDocument.fullName** : full name, including space and page name. Example value: ##Main.WebHome## | ||
| 164 | * XWikiDocument.author : last editor. Example value: ##XWiki.Admin## | ||
| 165 | * XWikiDocument.creator : first editor. Example value: ##XWiki.Admin## | ||
| 166 | |||
| 167 | === BaseObject === | ||
| 168 | |||
| 169 | * **BaseObject.id** : arbitrary unique id of the object. Example value: ##123456789## | ||
| 170 | * BaseObject.className : class. Example value: ##XWiki.XWikiUsers## | ||
| 171 | |||
| 172 | === *Property (StringProperty, IntegerProperty, etc) === | ||
| 173 | |||
| 174 | * **Property.id.id** : unique id of the object the property belongs to. Example value: ##123456789## | ||
| 175 | * Property.name : name of the property. Example value: ##first_name## | ||
| 176 | * Property.value : value. Example value: ##John## |
