/// <summary>
/// 获取指定实体所在的工作单元对象
/// </summary>
/// <param name="entityType">实体类型</param>
/// <returns>工作单元对象</returns>
public IUnitOfWork GetUnitOfWork(Type entityType)
{
if (!entityType.IsEntityType())
{
throw new HybridException($"类型“{entityType}”不是实体类型");
}
IUnitOfWork unitOfWork = _scopedDictionary.GetEntityUnitOfWork(entityType);
if (unitOfWork != null)
{
return(unitOfWork);
}
IEntityManager entityManager = ServiceProvider.GetService <IEntityManager>();
Type dbContextType = entityManager.GetDbContextTypeForEntity(entityType);
if (dbContextType == null)
{
throw new HybridException($"实体类“{entityType}”的所属上下文类型无法找到");
}
HybridDbContextOptions dbContextOptions = GetDbContextResolveOptions(dbContextType);
unitOfWork = _scopedDictionary.GetConnUnitOfWork(dbContextOptions.ConnectionString);
if (unitOfWork != null)
{
return(unitOfWork);
}
unitOfWork = ActivatorUtilities.CreateInstance <UnitOfWork>(ServiceProvider);
_scopedDictionary.SetEntityUnitOfWork(entityType, unitOfWork);
_scopedDictionary.SetConnUnitOfWork(dbContextOptions.ConnectionString, unitOfWork);
return(unitOfWork);
}
/// <summary>
/// 获取指定数据实体的上下文类型
/// </summary>
/// <param name="entityType">实体类型</param>
/// <returns>实体所属上下文实例</returns>
public IDbContext GetDbContext(Type entityType)
{
if (!entityType.IsEntityType())
{
throw new HybridException($"类型“{entityType}”不是实体类型");
}
IEntityManager manager = _serviceProvider.GetService <IEntityManager>();
Type dbContextType = manager.GetDbContextTypeForEntity(entityType);
//已存在上下文对象，直接返回
DbContextBase dbContext = _dbContexts.FirstOrDefault(m => m.GetType() == dbContextType);
if (dbContext != null)
{
return(dbContext);
}
dbContext = (DbContextBase)_serviceProvider.GetService(dbContextType);
if (!dbContext.ExistsRelationalDatabase())
{
throw new HybridException($"数据上下文“{dbContext.GetType().FullName}”的数据库不存在，请通过 Migration 功能进行数据迁移创建数据库。");
}
_dbContextOptions = _serviceProvider.GetHybridOptions().GetDbContextOptions(dbContextType);
ScopedDictionary scopedDictionary = _serviceProvider.GetService <ScopedDictionary>();
_connection = dbContext.Database.GetDbConnection();
scopedDictionary.TryAdd($"DnConnection_{_dbContextOptions.ConnectionString}", _connection);
dbContext.UnitOfWork = this;
_dbContexts.Add(dbContext);
return(dbContext);
}
/// <summary>
/// 初始化一个<see cref="DbContextBase"/>类型的新实例
/// </summary>
protected DbContextBase(DbContextOptions options, IEntityManager entityManager, IServiceProvider serviceProvider)
: base(options)
{
_entityManager = entityManager;
_serviceProvider = serviceProvider;
_hybridDbOptions = serviceProvider?.GetHybridOptions()?.DbContexts?.Values.FirstOrDefault(m => m.DbContextType == GetType());
_logger = serviceProvider?.GetLogger(GetType());
}
/// <summary>
/// 获取指定实体类型的Sql执行器
/// </summary>
public static ISqlExecutor <TEntity, TKey> GetSqlExecutor <TEntity, TKey>(this IUnitOfWorkManager unitOfWorkManager) where TEntity : IEntity <TKey>
{
HybridDbContextOptions options = unitOfWorkManager.GetDbContextResolveOptions(typeof(TEntity));
DatabaseType databaseType = options.DatabaseType;
IList <ISqlExecutor <TEntity, TKey> > executors = unitOfWorkManager.ServiceProvider.GetServices <ISqlExecutor <TEntity, TKey> >().ToList();
return(executors.FirstOrDefault(m => m.DatabaseType == databaseType));
}
/// <summary>
/// 获取数据上下文选项
/// </summary>
/// <param name="dbContextType">数据上下文类型</param>
/// <returns>数据上下文选项</returns>
public HybridDbContextOptions GetDbContextResolveOptions(Type dbContextType)
{
HybridDbContextOptions dbContextOptions = ServiceProvider.GetHybridOptions()?.GetDbContextOptions(dbContextType);
if (dbContextOptions == null)
{
throw new HybridException($"无法找到数据上下文“{dbContextType}”的配置信息");
}
return(dbContextOptions);
}
/// <summary>
/// 获取指定实体类型的数据上下文选项
/// </summary>
public static HybridDbContextOptions GetDbContextResolveOptions(this IUnitOfWorkManager unitOfWorkManager, Type entityType)
{
Type dbContextType = unitOfWorkManager.GetDbContextType(entityType);
HybridDbContextOptions dbContextOptions = unitOfWorkManager.ServiceProvider.GetHybridOptions()?.GetDbContextOptions(dbContextType);
if (dbContextOptions == null)
{
throw new HybridException($"无法找到数据上下文“{dbContextType}”的配置信息");
}
return(dbContextOptions);
}
public override bool LazyLoadingProxiesEnabled()
{
if (_serviceProvider == null)
{
IConfiguration configuration = Singleton <IConfiguration> .Instance;
return(configuration["Hybrid:DbContexts:PostgreSql:LazyLoadingProxiesEnabled"].CastTo(false));
}
HybridOptions options = _serviceProvider.GetHybridOptions();
HybridDbContextOptions contextOptions = options.GetDbContextOptions(typeof(DefaultDbContext));
if (contextOptions == null)
{
throw new HybridException($"上下文“{typeof(DefaultDbContext)}”的配置信息不存在");
}
return(contextOptions.LazyLoadingProxiesEnabled);
}
public override string GetConnectionString()
{
if (_serviceProvider == null)
{
IConfiguration configuration = Singleton <IConfiguration> .Instance;
string str = configuration["Hybrid:DbContexts:PostgreSql:ConnectionString"];
return(str);
}
HybridOptions options = _serviceProvider.GetHybridOptions();
HybridDbContextOptions contextOptions = options.GetDbContextOptions(typeof(DefaultDbContext));
if (contextOptions == null)
{
throw new HybridException($"上下文“{typeof(DefaultDbContext)}”的配置信息不存在");
}
return(contextOptions.ConnectionString);
}
/// <summary>
/// 将基于Hybrid数据上下文基类<see cref="DbContextBase"/>上下文类型添加到服务集合中
/// </summary>
/// <typeparam name="TDbContext">基于Hybrid数据上下文基类<see cref="DbContextBase"/>上下文类型</typeparam>
/// <param name="services">依赖注入服务集合</param>
/// <param name="optionsAction">数据库选项创建配置，将在内置配置后运行</param>
/// <returns>依赖注入服务集合</returns>
public static IServiceCollection AddHybridDbContext <TDbContext>(this IServiceCollection services, Action <IServiceProvider, DbContextOptionsBuilder> optionsAction = null) where TDbContext : DbContextBase
{
services.AddDbContext <TDbContext>((provider, builder) =>
{
Type dbContextType = typeof(TDbContext);
HybridOptions hybridOptions = provider.GetHybridOptions();
HybridDbContextOptions hybridDbContextOptions = hybridOptions?.GetDbContextOptions(dbContextType);
if (hybridDbContextOptions == null)
{
throw new HybridException($"无法找到数据上下文“{dbContextType.DisplayName()}”的配置信息");
}
//启用延迟加载
if (hybridDbContextOptions.LazyLoadingProxiesEnabled)
{
builder = builder.UseLazyLoadingProxies();
}
DatabaseType databaseType = hybridDbContextOptions.DatabaseType;
//处理数据库驱动差异处理
IDbContextOptionsBuilderDriveHandler driveHandler = provider.GetServices <IDbContextOptionsBuilderDriveHandler>()
.FirstOrDefault(m => m.Type == databaseType);
if (driveHandler == null)
{
throw new HybridException($"无法解析类型为“{databaseType}”的 {typeof(IDbContextOptionsBuilderDriveHandler).DisplayName()} 实例");
}
ScopedDictionary scopedDictionary = provider.GetService <ScopedDictionary>();
string key = $"DnConnection_{hybridDbContextOptions.ConnectionString}";
DbConnection existingDbConnection = scopedDictionary.GetValue <DbConnection>(key);
builder = driveHandler.Handle(builder, hybridDbContextOptions.ConnectionString, existingDbConnection);
//使用模型缓存
DbContextModelCache modelCache = provider.GetService <DbContextModelCache>();
IModel model = modelCache?.Get(dbContextType);
if (model != null)
{
builder = builder.UseModel(model);
}
//额外的选项
optionsAction?.Invoke(provider, builder);
});
return(services);
}
/// <summary>
/// 应用模块服务
/// </summary>
/// <param name="provider">服务提供者</param>
public override void UseModule(IServiceProvider provider)
{
HybridOptions options = provider.GetHybridOptions();
HybridDbContextOptions contextOptions = options.GetDbContextOptions(typeof(TDbContext));
if (contextOptions?.DatabaseType != DatabaseType)
{
return;
}
using (IServiceScope scope = provider.CreateScope())
{
TDbContext context = CreateDbContext(scope.ServiceProvider);
if (context != null && contextOptions.AutoMigrationEnabled)
{
context.CheckAndMigration();
DbContextModelCache modelCache = scope.ServiceProvider.GetService <DbContextModelCache>();
modelCache?.Set(context.GetType(), context.Model);
}
}
IsEnabled = true;
}
