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。
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]
GO
2、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();
}
}
}
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 -; }
}
}
}
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 -; }
}
}
}
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。
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Author：黄仲秋
QQ：875755898