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DATACMNS-220, DATAJPA-174 - Updated reference docs on query parsing.

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Updated the repositories reference documentation section on query parsing to reflect the correct usage of method prefixes, how to use the Distinct, IgnoreCase and OrderBy clauses.
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Oliver Gierke
2012-09-04 11:05:55 +02:00
parent bd6c0bf7c6
commit e922845407
1 changed files with 38 additions and 6 deletions
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44
src/docbkx/repositories.xml
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@@ -319,12 +319,14 @@ interface UserRepository extends MyBaseRepository<User, Long> {
<para>The query builder mechanism built into Spring Data repository
infrastructure is useful to build constraining queries over entities
of the repository. We will strip the prefixes <code>findBy</code>,
<code>find</code>, <code>readBy</code>, <code>read</code>,
<code>getBy</code> as well as <code>get</code> from the method and
start parsing the rest of it. At a very basic level you can define
conditions on entity properties and concatenate them with
<code>AND</code> and <code>OR</code>.</para>
of the repository. We will strip the prefixes <code>find…By</code>,
<code>read…By</code>, as well as <code>get…By</code> from the method
and start parsing the rest of it. The introducing clause can contain
further expressions such as a <code>Distinct</code> to set a distinct
flag on the query to be created. However, the first <code>By</code>
acts as delimiter to indicate the start of the actual criterias. At a
very basic level you can define conditions on entity properties and
concatenate them with <code>AND</code> and <code>OR</code>.</para>
<example>
<title>Query creation from method names</title>
@@ -332,6 +334,19 @@ interface UserRepository extends MyBaseRepository&lt;User, Long&gt; {
<para><programlisting language="java">public interface PersonRepository extends Repository&lt;User, Long&gt; {
List&lt;Person&gt; findByEmailAddressAndLastname(EmailAddress emailAddress, String lastname);
// Enables the distinct flag for the query
List&lt;Person&gt; findDistinctPeopleByLastnameOrFirstname(String lastname, String firstname);
List&lt;Person&gt; findPeopleDistinctByLastnameOrFirstname(String lastname, String firstname);
// Enabling ignoring case for an individual property
List&lt;Person&gt; findByLastnameIgnoreCase(String lastname);
// Enabling ignoring case for all suitable properties
List&lt;Person&gt; findByLastnameAndFirstnameAllIgnoreCase(String lastname, String firstname);
// Enabling static ORDER BY for a query
List&lt;Person&gt; findByLastnameOrderByFirstnameAsc(String lastname);
List&lt;Person&gt; findByLastnameOrderByFirstnameDesc(String lastname);
}</programlisting></para>
</example>
@@ -347,6 +362,23 @@ interface UserRepository extends MyBaseRepository&lt;User, Long&gt; {
datastore to datastore please consult the according part of the
reference documentation.</para>
<para>As you can see the method parser also supports setting an ignore
case flag for individual properties (e.g.
<methodname>findByLastnameIgnoreCase(…)</methodname>) or for all
properties of a type that support ignoring case (i.e. usually
<code>String</code>s, e.g.
<methodname>findByLastnameAndFirstnameAllIgnoreCase(…)</methodname>).
Whether ignoring cases is supported my differ from store to store, so
consult the relevant sections of the store specific query method
reference docs.</para>
<para>Static ordering can be applied by appending an
<code>OrderBy</code> clause to the query method referencing a property
and providing a sorting direction (<code>Asc</code> or
<code>Desc</code>). To create a query method that supports dynamic
sorting have a look at <xref
linkend="repositories.special-parameters"/>. </para>
<section id="repositories.query-methods.property-expressions">
<title>Property expressions</title>