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| <h3>JDOQL : Methods<a id="JDOQL_:_Methods"></a></h3> |
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| <div id="doc-content"> |
| <div class="sect1"> |
| <h2 id="index">JDOQL : Methods<a id="JDOQL_:_Methods"></a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>When writing the "filter" for a JDOQL Query you can make use of some |
| methods on the various Java types. The range of methods included as |
| standard in JDOQL is not as flexible as with the true Java types, but |
| the ones that are available are typically of much use.</p> |
| </div> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| <div class="sect2"> |
| <h3 id="_string_methods_a_id_string_methods_a">String Methods<a id="String_Methods"></a></h3> |
| <table class="tableblock frame-all grid-cols spread"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Method</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">startsWith(String)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns if the string starts with the passed string</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">startsWith(String, int)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns if the string starts with the passed |
| string, after the specified position</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">endsWith(String)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns if the string ends with the passed string</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">indexOf(String)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the first position of the passed string</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">indexOf(String, int)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the position of the passed string, after |
| the passed position</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">substring(int)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the substring starting from the passed position</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">substring(int, int)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the substring between the passed positions</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">toLowerCase()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the string in lowercase</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">toUpperCase()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Retuns the string in UPPERCASE</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">matches(String pattern)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns whether string matches the passed |
| expression. The pattern argument follows the rules of |
| java.lang.String.matches method.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">trim()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Retuns the string with leading/trailing spaces trimmed</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">length()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Retuns the length of the string</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">charAt(int)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the character at the specified position of the |
| string</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>Here’s an example using a Product class, looking for objects which their |
| abreviation is the beginning of a trade name. The trade name is provided |
| as parameter.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Declarative JDOQL : |
| Query query = pm.newQuery(mydomain.Product.class); |
| query.setFilter(":tradeName.startsWith(this.abbreviation)"); |
| List results = (List)query.execute("Workbook Advanced"); |
| |
| Single-String JDOQL : |
| Query query = pm.newQuery( |
| "SELECT FROM mydomain.Product " + |
| "WHERE :tradeName.startsWith(this.abbreviation)"); |
| List results = (List)query.execute("Workbook Advanced");</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| <div class="paragraph"> |
| <p>Here’s another example, demonstrating the "matches" method. Consult the |
| javadocs for Java regular expressions for the syntax of the matches |
| input.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Declarative JDOQL : |
| Query query = pm.newQuery(mydomain.Product.class); |
| query.setFilter("this.abbreviation.matches(\"a*b\")"); |
| List results = (List)query.execute(); |
| |
| Single-String JDOQL : |
| Query query = pm.newQuery( |
| "SELECT FROM mydomain.Product " + |
| "WHERE this.abbreviation.matches(\"a*b\")"); |
| List results = (List)query.execute();</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_collection_methods_a_id_collection_methods_a">Collection Methods<a id="Collection_Methods"></a></h3> |
| <table class="tableblock frame-all grid-cols spread"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Method</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">isEmpty()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns whether the collection is empty</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">contains(value)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns whether the collection contains the passed |
| element</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">size()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the number of elements in the collection</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>Here’s an example demonstrating use of contains(). We have an Inventory |
| class that has a Collection of Product objects, and we want to find the |
| Inventory objects with 2 particular Products in it. Here we make use of |
| a variable (<em>prd</em> to represent the Product being contained</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Declarative JDOQL : |
| Query query = pm.newQuery(mydomain.Inventory.class); |
| query.setFilter("products.contains(prd) && (prd.name==\"product 1\" || prd.name==\"product 2\")"); |
| List results = (List)query.execute(); |
| |
| Single-String JDOQL: |
| Query query = pm.newQuery( |
| "SELECT FROM mydomain.Inventory EXCLUDE SUBCLASSES " + |
| "WHERE products.contains(prd) && (prd.name==\"product 1\" || prd.name==\"product 2\")"); |
| List results = (List)query.execute();</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_list_methods_a_id_list_methods_a">List Methods<a id="List_Methods"></a></h3> |
| <table class="tableblock frame-all grid-cols spread"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Method</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">get(position)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the element at that position in the List |
| (JDO3.1)</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_map_methods_a_id_map_methods_a">Map Methods<a id="Map_Methods"></a></h3> |
| <table class="tableblock frame-all grid-cols spread"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Method</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">isEmpty()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns whether the map is empty</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">containsKey(key)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns whether the map contains the passed key</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">containsValue(value)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns whether the map contains the passed value</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">get(key)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the value from the map with the passed key</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">size()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the number of entries in the map</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>Here’s an example using a Product class as a value in a Map. Our example |
| represents an organisation that has several Inventories of products. |
| Each Inventory of products is stored using a Map, keyed by the Product |
| name. The query searches for all Inventories that contain a product with |
| the name "product 1".</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Declarative JDOQL : |
| Query query = pm.newQuery(mydomain.Inventory.class, "products.containsKey(\"product 1\")"); |
| List results = (List)query.execute(); |
| |
| Single-String JDOQL : |
| Query query = pm.newQuery( |
| "SELECT FROM mydomain.Inventory EXCLUDE SUBCLASSES " + |
| "WHERE products.containsKey(\"product 1\")"); |
| List results = (List)query.execute();</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_temporal_methods_a_id_temporal_methods_a">Temporal Methods<a id="Temporal_Methods"></a></h3> |
| <table class="tableblock frame-all grid-cols spread"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Method</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">getDay()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the day of the month</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">getMonth()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the month of the year</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">getYear()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the year</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">getHour()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the hour</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">getMinute()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the minute</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">getSecond()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the second</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_enum_methods_a_id_enum_methods_a">Enum Methods<a id="Enum_Methods"></a></h3> |
| <table class="tableblock frame-all grid-cols spread"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Method</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ordinal()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the ordinal of the enum</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">toString()</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the string form of the enum</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p><br></p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_other_methods_a_id_other_methods_a">Other Methods<a id="Other_Methods"></a></h3> |
| <table class="tableblock frame-all grid-cols spread"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Method</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Math.abs(number)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the absolute value of the passed number</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Math.sqrt(number)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the square root of the passed number</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Math.cos(number)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the cosine of the passed number</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Math.sin(number)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the sine of the passed number</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Math.tan(number)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the tangent of the passed number</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOHelper.getObjectId(object)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the object identity of the |
| passed persistent object</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">JDOHelper.getVersion(object)</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the version of the passed |
| persistent object</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| </div> |
| </div> |
| </div> |
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