Wiki source code of velocityHqlExamples
Version 4.5 by Sergiu Dumitriu on 2008/05/19
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| author | version | line-number | content |
|---|---|---|---|
| 1 | <style> | ||
| 2 | .code { | ||
| 3 | width: 100%; | ||
| 4 | } | ||
| 5 | </style> | ||
| 6 | |||
| 7 | #includeTopic("DevGuide.velocityHqlExamplesMacro") | ||
| 8 | |||
| 9 | 1 Velocity HQL query examples | ||
| 10 | |||
| 11 | 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. <br/> | ||
| 12 | |||
| 13 | #toc("" "" "") | ||
| 14 | |||
| 15 | 1.1 Public API (searchDocuments) | ||
| 16 | |||
| 17 | #info("With this API the query consist in the WHERE condition.\\ | ||
| 18 | Any user with edit rights can use this API (as in write a script using it).\\ | ||
| 19 | Any user with view rights can view the result of such a query.") | ||
| 20 | |||
| 21 | You can execute queries as follows: | ||
| 22 | {code} | ||
| 23 | #set($query="where doc.creator='XWiki.VincentMassol'") | ||
| 24 | #set($results = $xwiki.searchDocuments($query, 5, 0)) | ||
| 25 | #foreach ($item in $results) | ||
| 26 | * $item | ||
| 27 | #end | ||
| 28 | {code} | ||
| 29 | |||
| 30 | 1.1.1 Simple Query | ||
| 31 | #set($hql="where doc.creator='XWiki.VincentMassol'") | ||
| 32 | #displayQuery($hql false) | ||
| 33 | |||
| 34 | 1.1.1 Ordered Query | ||
| 35 | #set($hql="where doc.creator='XWiki.VincentMassol' order by doc.date asc") | ||
| 36 | #displayQuery($hql false) | ||
| 37 | |||
| 38 | 1.1.1 Advanced Query (date & time) | ||
| 39 | |||
| 40 | Since there is no [standard way to calculate dates interval in HQL>http://opensource.atlassian.com/projects/hibernate/browse/HHH-2434] those queries are a bit unnatural. | ||
| 41 | |||
| 42 | #set($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") | ||
| 43 | #displayQuery($hql false) | ||
| 44 | |||
| 45 | {code} | ||
| 46 | Other examples, documents modified : | ||
| 47 | |||
| 48 | during current day : "where year(doc.date) = year(current_date()) and month(doc.date) = month(current_date()) and day(doc.date) > (day(current_date()) - 1) order by doc.date desc" | ||
| 49 | during current week : "where year(doc.date) = year(current_date()) and month(doc.date) = month(current_date()) and day(doc.date) > (day(current_date()) - 7) order by doc.date desc" | ||
| 50 | during current month : "where year(doc.date) = year(current_date()) and month(doc.date) > (month(current_date()) - 1) order by doc.date desc" | ||
| 51 | {code} | ||
| 52 | |||
| 53 | |||
| 54 | 1.1 Privileged API (search : Documents, Objects, Properties, etc) | ||
| 55 | |||
| 56 | #warning("Calls to te privileged API are only executed when the calling page has been saved by an Admin. \\ | ||
| 57 | The reason is that search can be used to send any HQL command like update, delete, etc.") | ||
| 58 | |||
| 59 | You can execute queries as follows: | ||
| 60 | {code} | ||
| 61 | #set($query="select doc.name from XWikiDocument doc") | ||
| 62 | #set($results = $xwiki.search($query, 5, 0)) | ||
| 63 | #foreach ($item in $results) | ||
| 64 | * $item <br/> | ||
| 65 | #end | ||
| 66 | {code} | ||
| 67 | |||
| 68 | 1.1.1 Simply Query | ||
| 69 | #set($hql="select doc.name from XWikiDocument doc") | ||
| 70 | #displayQuery($hql true) | ||
| 71 | |||
| 72 | 1.1.1 Count Query | ||
| 73 | |||
| 74 | {code} | ||
| 75 | #set($query="select count(doc) from XWikiDocument doc") | ||
| 76 | #set($results = $xwiki.search($query)) | ||
| 77 | ## $xwiki.search returning a list, we get its first element | ||
| 78 | $query result : $results.get(0) | ||
| 79 | {code} | ||
| 80 | |||
| 81 | #set($query="select count(doc) from XWikiDocument doc") | ||
| 82 | #set($results = $xwiki.search($query)) | ||
| 83 | $query results : $results.get(0) | ||
| 84 | |||
| 85 | <br/> | ||
| 86 | 1.1.1 Simply Query with multiple fields | ||
| 87 | |||
| 88 | {code} | ||
| 89 | #set($results=$xwiki.search("select doc.name, doc.date from XWikiDocument doc", 5, 0)) | ||
| 90 | #foreach ($row in $results) | ||
| 91 | #foreach ($col in $row) | ||
| 92 | #if ($velocityCount==1) | ||
| 93 | #set($docName=$col) | ||
| 94 | #elseif ($velocityCount==2) | ||
| 95 | #set($docDate=$col) | ||
| 96 | #end | ||
| 97 | #end | ||
| 98 | $docName : $docDate <br/> | ||
| 99 | #end | ||
| 100 | {code} | ||
| 101 | |||
| 102 | #set($hql="select doc.name, doc.date from XWikiDocument doc") | ||
| 103 | #displayQuery($hql true) | ||
| 104 | |||
| 105 | <br/> | ||
| 106 | 1.1.1 Getting objects of a specific class | ||
| 107 | #set($hql="select obj.name from BaseObject obj where obj.className='XWiki.XWikiUsers'") | ||
| 108 | #displayQuery($hql true) | ||
| 109 | |||
| 110 | <br/> | ||
| 111 | 1.1.1 Getting objects' properties | ||
| 112 | #set($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'") | ||
| 113 | #displayQuery($hql true) | ||
| 114 | |||
| 115 | <br/> | ||
| 116 | 1.1.1 Getting documents where objects' properties equals some value | ||
| 117 | #set($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'") | ||
| 118 | #displayQuery($hql true) |
