Wiki source code of velocityHqlExamples
Version 27.1 by flavius on 2011/12/08
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27.1 | 1 | {{box cssClass="floatinginfobox" title="**Contents**"}} |
| 2 | {{toc start="2" depth="4"/}} | ||
| 3 | {{/box}} | ||
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17.1 | 4 | |
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20.1 | 5 | = HQL Query Examples in Velocity = |
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1.1 | 6 | |
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23.3 | 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. |
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1.1 | 8 | |
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22.1 | 9 | == Public API (##searchDocuments##) == |
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27.1 | 11 | {{velocity}} |
| 12 | {{html}} | ||
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22.1 | 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.") |
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27.1 | 14 | {{/html}} |
| 15 | {{/velocity}} | ||
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22.1 | 16 | |
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21.1 | 17 | General example showing how to display the first 5 results of a given query: |
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1.3 | 18 | |
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21.1 | 19 | {{code language="none"}} |
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22.2 | 20 | #set($hql = "<query here>") |
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21.1 | 21 | #set($results = $xwiki.searchDocuments($hql, 5, 0)) |
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1.3 | 22 | #foreach ($item in $results) |
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4.5 | 23 | * $item |
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1.3 | 24 | #end |
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15.1 | 25 | {{/code}} |
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1.3 | 26 | |
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21.1 | 27 | The examples below will show you various HQL queries that you can write. |
| 28 | |||
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15.1 | 29 | === Simple Query === |
| 30 | |||
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21.1 | 31 | Displays all documents who have been created by the user ##XWiki.JohnDoe##: |
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1.3 | 32 | |
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21.1 | 33 | {{code language="none"}} |
| 34 | #set($hql = "where doc.creator='XWiki.JohnDoe'") | ||
| 35 | {{/code}} | ||
| 36 | |||
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15.1 | 37 | === Ordered Query === |
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21.1 | 39 | Displays all documents who have been created by the user ##XWiki.JohnDoe## and sorted by document's last modification date, in ascending order: |
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1.21 | 40 | |
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21.1 | 41 | {{code language="none"}} |
| 42 | #set($hql = "where doc.creator='XWiki.VincentMassol' order by doc.date asc") | ||
| 43 | {{/code}} | ||
| 44 | |||
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15.1 | 45 | === Advanced Query (date & time) === |
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1.35 | 46 | |
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27.1 | 47 | {{velocity}} |
| 48 | {{html wiki="true"}} | ||
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21.1 | 49 | #info("Since there is no [[standard way to calculate dates interval in HQL>>http://opensource.atlassian.com/projects/hibernate/browse/HHH-2434]] those queries are a bit unnatural.") |
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27.1 | 50 | {{/html}} |
| 51 | {{/velocity}} | ||
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1.21 | 52 | |
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21.1 | 53 | {{code language="none"}} |
| 54 | #set($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") | ||
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15.1 | 55 | {{/code}} |
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1.35 | 56 | |
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21.1 | 57 | Other examples: |
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27.1 | 58 | |
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21.1 | 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}} | ||
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27.1 | 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}} |
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1.35 | 63 | |
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22.3 | 64 | == Privileged API (##search##) == |
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1.3 | 65 | |
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27.1 | 66 | {{velocity}} |
| 67 | {{html wiki="true"}} | ||
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22.4 | 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.") |
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27.1 | 69 | {{/html}} |
| 70 | {{/velocity}} | ||
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1.1 | 71 | |
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22.1 | 72 | General example showing how to display the first 5 results of a given query: |
| 73 | |||
| 74 | {{code language="none"}} | ||
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22.2 | 75 | #set($hql = "<query here>") |
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22.1 | 76 | #set($results = $xwiki.search($hql, 5, 0)) |
| 77 | #foreach ($item in $results) | ||
| 78 | * $item | ||
| 79 | #end | ||
| 80 | {{/code}} | ||
| 81 | |||
| 82 | The examples below will show you various HQL queries that you can write. | ||
| 83 | |||
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15.1 | 84 | === Simple Query === |
| 85 | |||
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21.1 | 86 | {{code language="none"}} |
| 87 | #set($hql = "select doc.name from XWikiDocument doc") | ||
| 88 | {{/code}} | ||
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1.1 | 89 | |
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15.1 | 90 | === Count Query === |
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1.19 | 91 | |
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21.1 | 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 : $results.get(0) | ||
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15.1 | 96 | {{/code}} |
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1.19 | 97 | |
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15.1 | 98 | === Simple Query with multiple fields === |
| 99 | |||
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21.1 | 100 | {{code language="none"}} |
| 101 | #set($results = $xwiki.search("select doc.name, doc.date from XWikiDocument doc", 5, 0)) | ||
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1.2 | 102 | #foreach ($row in $results) |
| 103 | #foreach ($col in $row) | ||
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21.1 | 104 | #if ($velocityCount == 1) |
| 105 | #set($docName = $col) | ||
| 106 | #elseif ($velocityCount == 2) | ||
| 107 | #set($docDate = $col) | ||
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1.2 | 108 | #end |
| 109 | #end | ||
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21.1 | 110 | $docName : $docDate <br/> |
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1.2 | 111 | #end |
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15.1 | 112 | {{/code}} |
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1.1 | 113 | |
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15.1 | 114 | === Getting objects of a specific class === |
| 115 | |||
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21.1 | 116 | {{code language="none"}} |
| 117 | #set($hql = "select obj.name from BaseObject obj where obj.className='XWiki.XWikiUsers'") | ||
| 118 | {{/code}} | ||
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1.1 | 119 | |
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15.1 | 120 | === Getting objects' properties === |
| 121 | |||
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21.1 | 122 | {{code language="none"}} |
| 123 | #set($hql = "select obj.name, prop.value from BaseObject obj, StringProperty prop where obj.className='XWiki.XWikiUsers' and prop.id.id=obj.id and prop.name='first_name'") | ||
| 124 | {{/code}} | ||
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1.19 | 125 | |
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15.1 | 126 | === Getting documents where objects' properties equals some value === |
| 127 | |||
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21.1 | 128 | {{code language="none"}} |
| 129 | #set($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}} | ||
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1.19 | 131 | |
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26.1 | 132 | {{code language="none"}} |
| 133 | #set($hql = ", BaseObject as obj, StringProperty as firstName, StringProperty as lastName where doc.fullName = obj.name and obj.className='XWiki.XWikiUsers' and obj.id=firstName.id.id and firstName.id.name='first_name' and obj.id=lastName.id.id and lastName.id.name='last_name' and firstName.value like 'A%' and lastName.value like 'B%' order by doc.fullName asc") | ||
| 134 | {{/code}} | ||
| 135 | |||
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15.1 | 136 | === List users currently editing pages === |
| 137 | |||
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21.1 | 138 | {{code language="none"}} |
| 139 | #set($hql = "select distinct lock.userName from XWikiLock lock") | ||
| 140 | {{/code}} | ||
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13.1 | 141 | |
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15.1 | 142 | === List attachments of a page === |
| 143 | |||
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21.1 | 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}} | ||
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14.1 | 147 | |
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23.1 | 148 | === Statistics === |
| 149 | |||
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26.2 | 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]] | ||
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23.1 | 156 | |
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21.1 | 157 | == Non-exhaustive list of queryable Object Fields == |
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27.1 | 158 | |
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25.1 | 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). |
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1.19 | 160 | |
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15.1 | 161 | === XWikiDocument === |
| 162 | |||
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21.1 | 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## | ||
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10.1 | 166 | |
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15.1 | 167 | === BaseObject === |
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10.1 | 168 | |
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21.1 | 169 | * **BaseObject.id** : arbitrary unique id of the object. Example value: ##123456789## |
| 170 | * BaseObject.className : class. Example value: ##XWiki.XWikiUsers## | ||
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10.1 | 171 | |
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21.1 | 172 | === *Property (StringProperty, IntegerProperty, etc) === |
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10.1 | 173 | |
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21.1 | 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## |
