复制内存中的 SQLite 数据库以使单元测试更快 [英] Copy in-memory SQLite Database to make unit tests faster
问题描述
在 C#/nHibernate 项目中,我使用 SQLite 对我的代码进行单元测试,大致使用此处描述的方法:http://ayende.com/blog/3983/nhibernate-unit-testing.
In C#/nHibernate-projects I am using SQLite to unit test my code, aproximately using the method described here: http://ayende.com/blog/3983/nhibernate-unit-testing.
但是,我发现构建和配置内存数据库通常需要大约 150 毫秒.我有很多单元测试,所以这些很快就会加起来.
However, I find that building and configuring the in-memory database typically takes about 150ms. I have lots of unit test so this rapidly adds up.
我想构建和配置一次数据库,将其存储在静态变量中,并在每次单元测试需要数据库时复制它.
I want to build and configure the database once, store it in a static variable, and copy it every time a unit test needs a database.
如何备份内存数据库?
我首先尝试创建一个命名的内存数据库.根据 https://www.sqlite.org/inmemorydb.html 这是可能的.我曾经有:
I first tried to create a named in-memory database. According to https://www.sqlite.org/inmemorydb.html this is possible. I used to have:
private const string ConnectionString = "Data Source=:memory:;Version=3;";
我试过的连接字符串是:
Connection strings I tried are:
private const string ConnectionString = "FullUri=file:memorydb.db?mode=memory&cache=shared";
private const string ConnectionString2 = "FullUri=file:memorydb2.db?mode=memory&cache=shared";
所以现在我只需要找出如何快速将内容从一个复制到另一个?差不多了:我可以创建两个内存数据库,然后调用BackupDatabase"来复制数据库.
So now I just have to find out how to quickly copy content from one to another? I'm almost there: I can create two in-memory databases, and call "BackupDatabase" to copy the database.
然而,单元测试的行为就像实例"数据库没有表,即使是原型"数据库也没有.
The unit test however, behaves like the "instance" database has no tables, even the "prototype" database does.
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();
}
推荐答案
我最终得到了这个工作代码.我的单元测试持续时间从十多分钟缩短到两分钟以下.(为了可读性稍微简化了代码)
I ended up with this working code. My unit test duration went from over ten minutes to under two minutes. (Code slightly simplified for readability)
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();
}
}
}
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