NopCommerce 多数据库方案
本文转自：http://www.cnblogs.com/YUTOUYUWEI/p/5538200.html
有时候一个项目需要连接多个数据库，以实现不同数据库的数据在同个项目的共享。
如果已经安装了nop，则需要在第二个数据库新建一个表，nop现在无法自动通过迁移来实现第二个或者更多数据库，所以这点需要我们手动去操作。
1、在SQLServer新建一个数据库，我这里新建的是TestDb，表为TestTable。
USE [TestDb]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[TestTable](
[Id] [int] IDENTITY(1,1) NOT NULL,
[Name] [nvarchar](255) NOT NULL,
[CreatedOnUtc] [datetime] NULL,
CONSTRAINT [PK_TestTable] PRIMARY KEY CLUSTERED
(
[Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO2、添加实体，在Nop.Core下的Domain添加一个文件夹OtherDb，在OtherDb添加一个TestTable类，继承BaseEntity
TestTable：
namespace Nop.Core.Domain.OtherDb
{
public class TestTable : BaseEntity
{
public string Name { get; set; }
public DateTime CreatedOnUtc { get; set; }
}
}3、添加映射，在Nop.Data下的Mapping添加一个OtherDb文件夹，在OtherDb添加一个TestTableMap映射类，继承NopEntityTypeConfiguration< TestTable >
TestTableMap：
namespace Nop.Data.Mapping.OtherDb
{
public class TestTableMap : NopEntityTypeConfiguration<TestTable>
{
public TestTableMap()
{
ToTable("TestTable");
HasKey(t => t.Id);
Property(t => t.Name).IsRequired().HasMaxLength(255);
}
}
}4、添加新的DbContext，在Nop.Data添加一个OhterDb，里面添加一个OtherDbObjectContext类继承DbContext和IDbContext，添加一个OtherDbEfStartUpTask继承IStartTask
OtherDbObjectContext：
namespace Nop.Data.OtherDb
{
public class OtherDbObjectContext : DbContext, IDbContext
{
public OtherDbObjectContext(string nameOrConnectionString)
: base(nameOrConnectionString)
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Configurations.Add(new TestTableMap());
base.OnModelCreating(modelBuilder);
}
public string CreateDatabaseScript()
{
return ((IObjectContextAdapter)this).ObjectContext.CreateDatabaseScript();
}
public new IDbSet<TEntity> Set<TEntity>() where TEntity : Core.BaseEntity
{
return base.Set<TEntity>();
}
public IList<TEntity> ExecuteStoredProcedureList<TEntity>(string commandText, params object[] parameters) where TEntity : Core.BaseEntity, new()
{
throw new NotImplementedException();
}
public IEnumerable<TElement> SqlQuery<TElement>(string sql, params object[] parameters)
{
throw new NotImplementedException();
}
public int ExecuteSqlCommand(string sql, bool doNotEnsureTransaction = false, int? timeout = null, params object[] parameters)
{
throw new NotImplementedException();
}
public void Detach(object entity)
{
throw new NotImplementedException();
}
public bool ProxyCreationEnabled
{
get { return this.Configuration.ProxyCreationEnabled; }
set { this.Configuration.ProxyCreationEnabled = value; }
}
public bool AutoDetectChangesEnabled
{
get { return this.Configuration.AutoDetectChangesEnabled; }
set { this.Configuration.AutoDetectChangesEnabled = value; }
}
}
}OtherDbEfStartUpTask：
namespace Nop.Data.OtherDb
{
public class OtherDbEfStartUpTask : IStartupTask
{
public void Execute()
{
Database.SetInitializer<OtherDbObjectContext>(null);
}
public int Order
{
get { return -1000; }
}
}}5、添加新的数据库连接字符串文本文件，用于连接TestDb数据库，在Nop.Web下面的App_Data下面添加一个文本文件命名OtherDbSetting.txt里面添加连接字符串
DataProvider: sqlserver
DataConnectionString: Data Source=.;Initial Catalog=TestDb;Integrated Security=False;Persist Security Info=False;User ID=登陆身份;Password=登陆密码
改变数据库连接名即可
6、在autofac注入新的OtherDbObjectContext，在Nop.WebFramework新建一个OtherDb文件夹，里面添加一个DependencyRegistrar类
DependencyRegistrar：
namespace Nop.Web.Framework.OtherDb
{
public class DependencyRegistrar : IDependencyRegistrar
{
protected virtual string MapPath(string path)
{
if (HostingEnvironment.IsHosted)
{
return HostingEnvironment.MapPath(path);
}
else
{
string baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
path = path.Replace("~/", "").TrimStart(‘/‘).Replace(‘/‘, ‘\\‘);
return Path.Combine(baseDirectory, path);
}
}
public void Register(ContainerBuilder builder, Core.Infrastructure.ITypeFinder typeFinder, Core.Configuration.NopConfig config)
{
var dataSettingManager = new DataSettingsManager();
var dataProviderSettings = dataSettingManager.LoadSettings(Path.Combine(MapPath("~/App_Data/"), "OtherDbSetting.txt"));
if (dataProviderSettings != null && dataProviderSettings.IsValid())
{
builder.Register<IDbContext>(c => new OtherDbObjectContext(dataProviderSettings.DataConnectionString))
.Named<IDbContext>("nop_object_context_otherdb").InstancePerLifetimeScope();
//builder.Register<OtherDbObjectContext>(
// c => new OtherDbObjectContext(dataProviderSettings.DataConnectionString)).InstancePerLifetimeScope();
}
else
{
builder.Register<IDbContext>(
c => new OtherDbObjectContext(c.Resolve<DataSettings>().DataConnectionString)).InstancePerLifetimeScope();
//builder.Register(
// c => new OtherDbObjectContext(c.Resolve<DataSettings>().DataConnectionString))
// .InstancePerLifetimeScope();
}
builder.RegisterType<EfRepository<TestTable>>()
.As<IRepository<TestTable>>()
.WithParameter(ResolvedParameter.ForNamed<IDbContext>("nop_object_context_otherdb"))
.InstancePerLifetimeScope();
}
public int Order
{
get { return -1; }
}
}
}全部添加没问题后，添加其他业务实现代码，重新生成解决方案即可。 此方案试用Nop3.4版本及以上，如有跟nop前期或者更新某个版本有差异，请自行斟酌修改。