NHibernate 学习总结(Many to One, App Config and NUnit)

1. Many to one and One to Many

class Parent

{

1.首先根据Code Smith自动生成的属性

2. 手动添加

private IList<Child> childs

public IList<Child> Childs

{

get {

if (childs == null)

childs = new List<Child> ();

return childs;

}

set { childs = value; }

}

}

Parent.hbm.xml例子（Build Action设置为Embedded Resource）

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">

<class name="Test.Model.Parent,Test.Model" table="Person" lazy="false">

<id name="Id" column="id" type="Int32">

<generator class="identity" />

</id>

<property name="Name" column="name" type="String" length="50" />

<bag name="Childs" table="Child" cascade="all" inverse="true">

<key column="id" />

<one-to-many class="Test.Model.Child, Test.Model" />

</bag>

</class>

</hibernate-mapping>

class Child

{

1. 首先根据Code Smith自动生成的属性

2.手动删除自动生成的private int _ParentID;以及属性

否则出现：NHibernate and ‘Invalid Index N for this SqlParameterCollection with Count=N error’错误。

3.手动添加

private Parent_Parent;

public Person Parent

{

get

{

if (_Parent == null) _Parent = new Parent();

return _Parent;

}

set

{

_Parent = value;

}

}

}

Child.hbm.xml例子

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">

<class name="Test.Model.Child,Test.Model" table="Child" lazy="false">

<id name="ChildID" column="ChildID" type="Int32">

<generator class="identity" />

</id>

<property name="Name" column="name" type="String" length="50" />

<many-to-one name="Parent" column="PersonID" class="Test.Model.Parent, Test.Model"/>

</class>

</hibernate-mapping>

2. App config例子

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

<configSections>

<section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate" />

<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />

</configSections>

<!-- Add this element -->

<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">

<session-factory>

<property name="dialect">NHibernate.Dialect.MsSql2005Dialect</property>

<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>

<property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>

<property name="connection.connection_string">Server=localhost;Initial Catalog=NHibernate;Integrated Security=SSPI</property>

<property name="connection.isolation">ReadCommitted</property>

<property name="default_schema">NHibernate.dbo</property>

<property name="show_sql">true</property>

<!-- HBM Mapping Files -->

<mapping assembly="Test.Model" />

</session-factory>

</hibernate-configuration>

<log4net>

<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender" >

<layout type="log4net.Layout.PatternLayout">

<conversionPattern value="%date [%thread] %-5level %logger [%ndc] - %message%newline" />

</layout>

</appender>

<root>

<level value="ALL" />

<appender-ref ref="ConsoleAppender" />

</root>

</log4net>

</configuration>

3. NUnit 测试代码

[TestMethod]

public void TestMethod1()

{

Configuration cf = new Configuration().AddAssembly("Test.Model"); ;

ISessionFactory sf = cf.BuildSessionFactory();

ISession s = sf.OpenSession();

Parent p = new Parent();

p.Name = "parent";

Child child = new Child();

child.Name = "test child";

child.Parent = p; // 必须设置父对象才能正确保存!

p.Childs.Add(child);

ITransaction trans = s.BeginTransaction();

try

{

s.Save(p);

trans.Commit();

}

catch (Exception ex)

{

trans.Rollback();

}

}