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] 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{ 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 IDbSetSet () where TEntity : Core.BaseEntity { return base.Set (); } public IList ExecuteStoredProcedureList (string commandText, params object[] parameters) where TEntity : Core.BaseEntity, new() { throw new NotImplementedException(); } public IEnumerable SqlQuery (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(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(c => new OtherDbObjectContext(dataProviderSettings.DataConnectionString)) .Named ("nop_object_context_otherdb").InstancePerLifetimeScope(); //builder.Register ( // c => new OtherDbObjectContext(dataProviderSettings.DataConnectionString)).InstancePerLifetimeScope(); } else { builder.Register ( c => new OtherDbObjectContext(c.Resolve ().DataConnectionString)).InstancePerLifetimeScope(); //builder.Register( // c => new OtherDbObjectContext(c.Resolve ().DataConnectionString)) // .InstancePerLifetimeScope(); } builder.RegisterType >() .As >() .WithParameter(ResolvedParameter.ForNamed ("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。