我在我的应用程序中遇到问题:我有两个数据库,我想用NHibernate访问它们,但在配置文件中我只有一个连接字符串用于一个数据库。那么如何将多个连接字符串传递给NHibernate呢?
答案 0 :(得分:3)
我通常在app.config
中定义连接字符串:
<connectionStrings>
<add name="connection1" connectionString="Data Source=;User ID=;Password=;" />
<add name="connection2" connectionString="Data Source=;User ID=;Password=;" />
</connectionStrings>
然后我用nhibernate配置创建2个单独的(nhibernate)配置文件(如果你有2个不同的数据库)。
我使用一个允许我创建会话工厂的类:
public class NHibernateSessionFactory
{
private ISessionFactory sessionFactory;
private readonly string ConnectionString = "";
private readonly string nHibernateConfigFile = "";
public NHibernateSessionFactory(String connectionString, string nHConfigFile)
{
this.ConnectionString = connectionString;
this.nHibernateConfigFile = nHConfigFile;
}
public ISessionFactory SessionFactory
{
get { return sessionFactory ?? (sessionFactory = CreateSessionFactory()); }
}
private ISessionFactory CreateSessionFactory()
{
Configuration cfg;
cfg = new Configuration().Configure(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, this.nHibernateConfigFile));
// With this row below Nhibernate searches for the connection string inside the App.Config.
// cfg.SetProperty(NHibernate.Cfg.Environment.ConnectionStringName, System.Environment.MachineName);
cfg.SetProperty(NHibernate.Cfg.Environment.ConnectionString, this.ConnectionString);
#if DEBUG
cfg.SetProperty(NHibernate.Cfg.Environment.GenerateStatistics, "true");
cfg.SetProperty(NHibernate.Cfg.Environment.ShowSql, "true");
#endif
return (cfg.BuildSessionFactory());
}
}
现在我可以使用自己的特定配置创建许多不同的会话工厂:
var sessionFactory1 = new NHibernateSessionFactory("connection string 1", "sql.nhibernate").SessionFactory;
var sessionFactory2 = new NHibernateSessionFactory("connection string 2", "ora.nhibernate").SessionFactory;
您可以找到更多信息here。
答案 1 :(得分:1)
对于每个数据库,您需要一个自己的SessionFactory。如果省略NH配置中的ConnectionString,则可以在构建Sessionfactory时在Code中指定它:
var sessionFactory1 = new Configuration()
.Configure()
.SetProperty("connection.connection_string", "First Connection String").BuildSessionFactory();
var sessionFactory2 = new Configuration()
.Configure()
.SetProperty("connection.connection_string", "Second Connection String").BuildSessionFactory();