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[英]How to ignore nested transactions using in-memory Sqlite on Unit Tests?
[英]Copy in-memory SQLite Database to make unit tests faster
在C#/ nHibernate-projects中,我正在使用SQLite對我的代碼進行單元測試,大致使用此處描述的方法: http : //ayende.com/blog/3983/nhibernate-unit-testing 。
但是,我發現構建和配置內存數據庫通常需要大約150ms。 我有很多單元測試,所以很快就加起來了。
我想一次構建和配置數據庫,將其存儲在靜態變量中,並在每次單元測試需要數據庫時將其復制。
如何備份內存數據庫?
我首先嘗試創建一個命名的內存數據庫。 根據https://www.sqlite.org/inmemorydb.html,這是可能的。 我曾經有過:
private const string ConnectionString = "Data Source=:memory:;Version=3;";
我嘗試的連接字符串是:
private const string ConnectionString = "FullUri=file:memorydb.db?mode=memory&cache=shared";
private const string ConnectionString2 = "FullUri=file:memorydb2.db?mode=memory&cache=shared";
因此,現在我只需要了解如何快速將內容從一個復制到另一個? 我快到了:我可以創建兩個內存數據庫,然后調用“ BackupDatabase”來復制數據庫。
但是,單元測試的行為就像“實例”數據庫沒有表一樣,即使“原型”數據庫也沒有。
private static ISessionFactory _prototypeSessionFactory;
private const string InstanceConnectionString = "FullUri=file:memorydb.db?mode=memory&cache=shared";
private const string PrototypeConnectionString = "FullUri=file:memorydb2.db?mode=memory&cache=shared";
private SQLiteConnection _instanceConnection;
private ISessionFactory _instanceSessionFactory;
public DatabaseScope(Assembly assembly)
{
var prototyeConfiguration = SQLiteConfiguration.Standard.ConnectionString(PrototypeConnectionString);
var cfg = Fluently
.Configure()
.Database(prototyeConfiguration)
.Mappings(m => m.HbmMappings.AddFromAssembly(assembly));
cfg.ExposeConfiguration(BuildSchema);
_prototypeSessionFactory = cfg.BuildSessionFactory();
var instanceConfiguration = SQLiteConfiguration.Standard.ConnectionString(InstanceConnectionString);
_instanceSessionFactory = Fluently
.Configure()
.Database(instanceConfiguration)
.BuildSessionFactory();
CopyDatabase();
}
private void CopyDatabase()
{
var cnnIn = new SQLiteConnection(PrototypeConnectionString);
var cnnOut = new SQLiteConnection(InstanceConnectionString);
cnnIn.Open();
cnnOut.Open();
cnnIn.BackupDatabase(cnnOut, "main", "main", -1, null, -1);
cnnIn.Close();
cnnOut.Close();
}
我最終得到了這個工作代碼。 我的單元測試時間從十多分鍾縮短到不到兩分鍾。 (為便於閱讀,代碼略有簡化)
using System;
using System.Data;
using System.Data.SQLite;
using System.IO;
using System.Reflection;
using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using NHibernate;
using NHibernate.Mapping;
using NHibernate.Tool.hbm2ddl;
namespace TestHelper.DbHelper.SqLite
{
public class DatabaseScope : IDisposable
{
private static Assembly _prototypeAssembly;
private const string PrototypeConnectionString = "FullUri=file:prototype.db?mode=memory&cache=shared";
private static ISessionFactory _prototypeSessionFactory;
private static SQLiteConnection _prototypeConnection;
private const string InstanceConnectionString = "FullUri=file:instance.db?mode=memory&cache=shared";
private ISessionFactory _instanceSessionFactory;
private SQLiteConnection _instanceConnection;
public DatabaseScope(Assembly assembly)
{
InitDatabasePrototype(assembly);
InitDatabaseInstance();
}
private void InitDatabasePrototype(Assembly assembly)
{
if (_prototypeAssembly == assembly) return;
if (_prototypeConnection != null)
{
_prototypeConnection.Close();
_prototypeConnection.Dispose();
_prototypeSessionFactory.Dispose();
}
_prototypeAssembly = assembly;
_prototypeConnection = new SQLiteConnection(PrototypeConnectionString);
_prototypeConnection.Open();
_prototypeSessionFactory = Fluently
.Configure()
.Database(SQLiteConfiguration.Standard.ConnectionString(PrototypeConnectionString))
.Mappings(m => m.HbmMappings.AddFromAssembly(assembly))
.ExposeConfiguration(cfg => new SchemaExport(cfg).Execute(false, true, false, _prototypeConnection, null))
.BuildSessionFactory();
}
private void InitDatabaseInstance()
{
_instanceSessionFactory = Fluently
.Configure()
.Database(SQLiteConfiguration.Standard.ConnectionString(InstanceConnectionString))
.Mappings(m => m.HbmMappings.AddFromAssembly(_prototypeAssembly))
.BuildSessionFactory();
_instanceConnection = new SQLiteConnection(InstanceConnectionString);
_instanceConnection.Open();
_prototypeConnection.BackupDatabase(_instanceConnection, "main", "main", -1, null, -1);
}
public ISession OpenSession()
{
return _instanceSessionFactory.OpenSession(_instanceConnection);
}
public void Dispose()
{
_instanceConnection.Close();
_instanceConnection.Dispose();
_instanceSessionFactory.Dispose();
}
}
}
我在內存數據庫中使用SQLite觀察到的是,一旦關閉連接,數據庫中的所有內容都消失了。 所以做你想做的,
為備份數據庫創建會話工廠,打開會話並建立架構,直到您完成整個測試套件后才關閉該會話
為目標數據庫創建會話工廠,打開會話並使用此會話對象中的連接以及步驟1中創建的會話中的連接來復制數據
使用在步驟2中創建的會話進行測試,並在測試完成后將其關閉
另一個解決方案是使用單個會話執行多個測試(所有測試都在單個測試夾具中),那么您不需要為每個測試創建新的會話工廠,而是為每個測試夾具創建新的會話工廠。
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