Nhibernate3.0cookbook学习笔记配置与架构-创新互联

NHibernate项目中都有App.config，主要是用来配置项目中的日志与数据库等。

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典型的App.config配置文件(这里包括log4net)：

View Code
<?xml version="1.0" encoding="utf-8"?><configuration>  <configSections> <!--定义配置节点-->   <sectionname="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate"/>   <sectionname="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>  </configSections>  <connectionStrings> <!--配置数据库-->   <addname="db" connectionString="Data Source=.;Initial Catalog=NHCookbook;Integrated Security=True"/>  </connectionStrings>  <log4net>   <appendername="trace"
        type="log4net.Appender.TraceAppender, log4net"> <layouttype="log4net.Layout.PatternLayout, log4net">  <paramname="ConversionPattern"
                value=" %date %level %message%newline" /> </layout>   </appender>   <root> <levelvalue="ALL" /> <appender-refref="trace" />   </root>   <loggername="NHibernate"> <levelvalue="INFO" />   </logger>   <!--<logger name="MyApp.Project.SomeNamespace.Foo">
      <level value="WARN" />
    </logger>-->   <loggername="NHibernate.SQL"> <levelvalue="DEBUG" />   </logger>  </log4net>  
  <hibernate-configuration
xmlns="urn:nhibernate-configuration-2.2">   <session-factory>  <!--指定代理工厂类--> <propertyname="proxyfactory.factory_class">
                NHibernate.ByteCode.Castle.ProxyFactoryFactory,
                NHibernate.ByteCode.Castle
</property>  <!--数据库类型--> <propertyname="dialect">
                NHibernate.Dialect.MsSql2008Dialect,
                NHibernate
</property>  <!--数据库名--> <propertyname="connection.connection_string_name">
                db
</property>  <!--数据库并发数--> <propertyname="adonet.batch_size">
                100
</property>  <!--映射的类名--> <mappingassembly="Eg.Core"/>   </session-factory>  </hibernate-configuration></configuration>

一些配置节点说明(水平有限就不翻译了，直接贴书上的表格)：

Property nameDescription
connection.providerProvider class to open and close database
connections.
connection.driver_classThis is specific to the RDBMS used, and is typically set
by the dialect.
connection.connection_stringDatabase connection string.
connection.connection_string_
name		Name of connection string in
<connectionStrings> element.
connection.isolationTransaction isolation level.
dialectRequired. A class to build RDBMS-specific SQL strings.
Typically, this is one of the many dialects from the
NHibernate.Dialect namespace
show_sqlBoolean value. Set to true to log all SQL statements to
Console.Out. Alternatively, log4net may be used to
log to other locations
current_session_context_classClass to manage contextual sessions
query.substitutionsComma-separated list of translations to perform on
query strings. For example, True=1, Yes=1, False=0,
No=0.
sql_exception_converterClass to convert RDBMS-specific ADO.NET Exceptions
to custom exceptions
prepare_sqlBoolean value. Prepares SQL statements and caches
the execution plan for the duration of the database
connection.
command_timeoutNumber of seconds to wait for a SQL command to
complete before timing out.
adonet.batch_sizeNumber of SQL commands to send at once before
waiting for a response from the database
generate_statisticsEnables tracking of some statistical information,
such as the number of queries executed and entities
loaded
proxyfactory.factory_classRequired. Specifies a factory class for our chosen
proxy framework, in this case Castle DynamicProxy2
format_sqlAdds line endings for easier-to-read SQL statements

顺便贴一下Nhibernate的数据访问架构：

将hibernate-configuration配置在单独的文件中

我们也可以将App.config中的hibernate-configuration节点抽取出来，单独配置在另一个XML文件中，并将该XML文件的属性,复制到输出目录设置为：如果较新复制。

利用代码配置hibernate-configuration

我们也可以通过代码来配置hibernate-configuration节点中的内容.

App.config文件还是要的：

<?xml version="1.0" encoding="utf-8"?><configuration><connectionStrings><addname="db" connectionString="Server=.SQLExpress;
Database=NHCookbook; Trusted_Connection=SSPI"/></connectionStrings></configuration>

然后在Program.cs代码中先引用命名空间：

using NHibernate.ByteCode.Castle;
using NHibernate.Cfg;
using NHibernate.Cfg.Loquacious;
using NHibernate.Dialect;

在Main方法中增加如下代码：

var nhConfig = new Configuration()
.Proxy(proxy=>
proxy.ProxyFactoryFactory<ProxyFactoryFactory>())
.DataBaseIntegration(db=>
{
db.Dialect<MsSql2008Dialect>();
db.ConnectionStringName= "db";
db.BatchSize= 100;
})
.AddAssembly("Eg.Core");
var sessionFactory = nhConfig.BuildSessionFactory();
Console.WriteLine("NHibernate Configured!");
Console.ReadKey();

注意：DataBaseIntegration是一个扩展方法，要引用NHibernate.Cfg.Loquacious命名空间。

利用Fluent NHibernate

App.config：

<?xml version="1.0" encoding="utf-8"?><configuration><connectionStrings>  <addname="db" connectionString="Server=.SQLExpress;
Database=NHCookbook; Trusted_Connection=SSPI"/></connectionStrings></configuration>

增加代码：

using Eg.FluentMappings.Mappings;
using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using NHibernate.ByteCode.Castle;
var nhConfig = Fluently.Configure()
.Database(MsSqlConfiguration.MsSql2008
.ConnectionString(connstr=>
connstr.FromConnectionStringWithKey("db")
)
.ProxyFactoryFactory<ProxyFactoryFactory>()
.AdoNetBatchSize(100)
)
.Mappings(mappings=> mappings.FluentMappings
.AddFromAssemblyOf<ProductMapping>()
)
.BuildConfiguration();
var sessionFactory = nhConfig.BuildSessionFactory();
Console.WriteLine("NHibernate configured fluently!");
Console.ReadKey();

利用ConfORM Mappings

App.config：

View Code
<?xml version="1.0" encoding="utf-8"?><configuration><configSections>  <sectionname="hibernate-configuration"
    type="NHibernate.Cfg.ConfigurationSectionHandler,
NHibernate"/></configSections><connectionStrings>  <addname="db" connectionString="Server=.SQLExpress;
Database=NHCookbook; Trusted_Connection=SSPI"/></connectionStrings><hibernate-configuration
xmlns="urn:nhibernate-configuration-2.2">  <session-factory> <propertyname="proxyfactory.factory_class">
        NHibernate.ByteCode.Castle.ProxyFactoryFactory,
        NHibernate.ByteCode.Castle
</property> <propertyname="dialect">
        NHibernate.Dialect.MsSql2008Dialect,
        NHibernate
</property> <propertyname="connection.connection_string_name">
        db
</property> <propertyname="adonet.batch_size">
        100
</property>  </session-factory></hibernate-configuration></configuration>

增加代码：

using Eg.ConfORMMapping.Mappings;
using NHibernate.Cfg;
var mappingFactory = new MappingFactory();
var mapping = mappingFactory.CreateMapping();
var nhConfig = new Configuration().Configure();
nhConfig.AddDeserializedMapping(mapping,null);
var sessionFactory = nhConfig.BuildSessionFactory();
Console.WriteLine("NHibernate configured!");
Console.ReadKey();

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