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NH-3488 - Strongly typed Inserts, Updates and Deletes (#391)
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‎doc/reference/modules/batch.xml

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@@ -133,7 +133,8 @@ session.Close();]]></programlisting>
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(DML) statements: <literal>INSERT</literal>, <literal>UPDATE</literal>, <literal>DELETE</literal>)
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data directly in the database will not affect in-memory state. However, NHibernate provides methods
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for bulk SQL-style DML statement execution which are performed through the
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Hibernate Query Language (<link linkend="queryhql">HQL</link>).
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Hibernate Query Language (<link linkend="queryhql">HQL</link>). A
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<link linkend="querylinq-modifying">Linq implementation</link> is available too.
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</para>
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<para>

‎doc/reference/modules/query_linq.xml

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@@ -467,6 +467,119 @@ IList<Cat> oldCats =
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.ToList();]]></programlisting>
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</sect1>
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<sect1 id="querylinq-modifying">
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<title>Modifying entities inside the database</title>
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<para>
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Beginning with NHibernate 5.0, Linq queries can be used for inserting, updating or deleting entities.
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The query defines the data to delete, update or insert, and then <literal>Delete</literal>,
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<literal>Update</literal>, <literal>UpdateBuilder</literal>, <literal>InsertInto</literal> and
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<literal>InsertBuilder</literal> queryable extension methods allow to delete it,
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or instruct in which way it should be updated or inserted. Those queries happen entirely inside the
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database, without extracting corresponding entities out of the database.
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</para>
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<para>
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These operations are a Linq implementation of <xref linkend="batch-direct" />, with the same abilities
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and limitations.
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</para>
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<sect2 id="querylinq-modifying-insert">
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<title>Inserting new entities</title>
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<para>
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<literal>InsertInto</literal> and <literal>InsertBuilder</literal> method extensions expect a NHibernate
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queryable defining the data source of the insert. This data can be entities or a projection. Then they
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allow specifying the target entity type to insert, and how to convert source data to those target
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entities. Three forms of target specification exist.
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</para>
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<para>
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Using projection to target entity:
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</para>
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<programlisting><![CDATA[session.Query<Cat>()
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.Where(c => c.BodyWeight > 20)
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.InsertInto(c => new Dog { Name = c.Name + "dog", BodyWeight = c.BodyWeight });]]></programlisting>
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<para>
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Projections can be done with an anonymous object too, but it requires supplying explicitly the target
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type, which in turn requires re-specifying the source type:
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</para>
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<programlisting><![CDATA[session.Query<Cat>()
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.Where(c => c.BodyWeight > 20)
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.InsertInto<Cat, Dog>(c => new { Name = c.Name + "dog", BodyWeight = c.BodyWeight });]]></programlisting>
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<para>
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Or using assignments:
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</para>
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<programlisting><![CDATA[session.Query<Cat>()
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.Where(c => c.BodyWeight > 20)
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.InsertBuilder()
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.Into<Dog>()
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.Value(d => d.Name, c => c.Name + "dog")
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.Value(d => d.BodyWeight, c => c.BodyWeight)
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.Insert();]]></programlisting>
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<para>
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In all cases, unspecified properties are not included in the resulting SQL insert.
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<link linkend="mapping-declaration-version"><literal>version</literal></link> and
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<link linkend="mapping-declaration-timestamp"><literal>timestamp</literal></link> properties are
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exceptions. If not specified, they are inserted with their <literal>seed</literal> value.
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</para>
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<para>
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For more information on <literal>Insert</literal> limitations, please refer to
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<xref linkend="batch-direct" />.
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</para>
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</sect2>
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<sect2 id="querylinq-modifying-update">
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<title>Updating entities</title>
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<para>
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<literal>Update</literal> and <literal>UpdateBuilder</literal> method extensions expect a NHibernate
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queryable defining the entities to update. Then they allow specifying which properties should be
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updated with which values. As for insertion, three forms of target specification exist.
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</para>
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<para>
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Using projection to updated entity:
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</para>
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<programlisting><![CDATA[session.Query<Cat>()
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.Where(c => c.BodyWeight > 20)
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.Update(c => new Cat { BodyWeight = c.BodyWeight / 2 });]]></programlisting>
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<para>
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Projections can be done with an anonymous object too:
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</para>
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<programlisting><![CDATA[session.Query<Cat>()
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.Where(c => c.BodyWeight > 20)
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.Update(c => new { BodyWeight = c.BodyWeight / 2 });]]></programlisting>
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<para>
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Or using assignments:
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</para>
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<programlisting><![CDATA[session.Query<Cat>()
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.Where(c => c.BodyWeight > 20)
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.UpdateBuilder()
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.Set(c => c.BodyWeight, c => c.BodyWeight / 2)
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.Update();]]></programlisting>
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<para>
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In all cases, unspecified properties are not included in the resulting SQL update. This could
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be changed for <link linkend="mapping-declaration-version"><literal>version</literal></link> and
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<link linkend="mapping-declaration-timestamp"><literal>timestamp</literal></link> properties:
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using <literal>UpdateVersioned</literal> instead of <literal>Update</literal> allows incrementing
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the version. Custom version types (<literal>NHibernate.Usertype.IUserVersionType</literal>) are
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not supported.
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</para>
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<para>
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When using projection to updated entity, please note that the constructed entity must have the
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exact same type than the underlying queryable source type. Attempting to project to any other class
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(anonymous projections excepted) will fail.
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</para>
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</sect2>
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<sect2 id="querylinq-modifying-delete">
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<title>Deleting entities</title>
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<para>
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<literal>Delete</literal> method extension expects a queryable defining the entities to delete.
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It immediately deletes them.
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</para>
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<programlisting><![CDATA[session.Query<Cat>()
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.Where(c => c.BodyWeight > 20)
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.Delete();]]></programlisting>
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</sect2>
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</sect1>
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<sect1 id="querylinq-querycache">
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<title>Query cache</title>
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‎src/NHibernate.Test/Hql/Ast/BulkManipulation.cs

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@@ -70,6 +70,29 @@ public void SimpleInsert()
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data.Cleanup();
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}
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[Test]
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public void SimpleInsertFromAggregate()
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{
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var data = new TestData(this);
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data.Prepare();
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ISession s = OpenSession();
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ITransaction t = s.BeginTransaction();
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s.CreateQuery("insert into Pickup (id, Vin, Owner) select id, max(Vin), max(Owner) from Car group by id").ExecuteUpdate();
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t.Commit();
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t = s.BeginTransaction();
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s.CreateQuery("delete Vehicle").ExecuteUpdate();
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t.Commit();
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s.Close();
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data.Cleanup();
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}
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[Test]
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public void InsertWithManyToOne()
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{
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data.Cleanup();
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}
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[Test]
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public void InsertWithManyToOneAsParameter()
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{
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var data = new TestData(this);
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data.Prepare();
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ISession s = OpenSession();
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ITransaction t = s.BeginTransaction();
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var mother = data.Butterfly;
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s.CreateQuery(
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"insert into Animal (description, bodyWeight, mother) select description, bodyWeight, :mother from Human")
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.SetEntity("mother",mother)
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.ExecuteUpdate();
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t.Commit();
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t = s.BeginTransaction();
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t.Commit();
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s.Close();
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data.Cleanup();
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}
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[Test]
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public void InsertWithMismatchedTypes()
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{

‎src/NHibernate.Test/LinqBulkManipulation/Domain/Address.cs

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namespace NHibernate.Test.LinqBulkManipulation.Domain
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{
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public class Address
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{
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private string street;
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private string city;
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private string postalCode;
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private string country;
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private StateProvince stateProvince;
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public string Street
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{
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get { return street; }
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set { street = value; }
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}
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public string City
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{
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get { return city; }
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set { city = value; }
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}
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public string PostalCode
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{
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get { return postalCode; }
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set { postalCode = value; }
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}
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public string Country
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{
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get { return country; }
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set { country = value; }
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}
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public StateProvince StateProvince
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{
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get { return stateProvince; }
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set { stateProvince = value; }
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}
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}
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}

‎src/NHibernate.Test/LinqBulkManipulation/Domain/Animal.cs

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using System.Collections.Generic;
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namespace NHibernate.Test.LinqBulkManipulation.Domain
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{
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public class Animal
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{
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private long id;
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private float bodyWeight;
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private ISet<Animal> offspring;
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private Animal mother;
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private Animal father;
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private string description;
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private Zoo zoo;
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private string serialNumber;
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public virtual long Id
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{
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get { return id; }
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set { id = value; }
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}
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public virtual float BodyWeight
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{
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get { return bodyWeight; }
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set { bodyWeight = value; }
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}
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public virtual ISet<Animal> Offspring
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{
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get { return offspring; }
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set { offspring = value; }
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}
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public virtual Animal Mother
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{
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get { return mother; }
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set { mother = value; }
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}
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public virtual Animal Father
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{
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get { return father; }
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set { father = value; }
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}
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public virtual string Description
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{
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get { return description; }
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set { description = value; }
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}
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public virtual Zoo Zoo
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{
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get { return zoo; }
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set { zoo = value; }
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}
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public virtual string SerialNumber
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{
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get { return serialNumber; }
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set { serialNumber = value; }
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}
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public virtual void AddOffspring(Animal offSpring)
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{
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if (offspring == null)
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{
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offspring = new HashSet<Animal>();
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}
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offspring.Add(offSpring);
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}
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}
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}

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