/// <summary>
/// 初始化 <see cref="ContextServiceBase"/> 类的新实例。
/// </summary>
/// <param name="context"></param>
protected ContextServiceBase(ContextServiceContext context)
{
Provider = context.Options.Provider;
ContextType = context.ContextType;
ServiceProvider = context.ServiceProvider;
Options = context.Options;
InstanceName = ContextInstanceManager.TryAdd(context.Options);
}
/// <summary>
/// 初始化 <see cref="ContextServiceBase"/> 类的新实例。
/// </summary>
/// <param name="context"></param>
public ContextServiceBase(EntityContextInitializeContext context)
{
InitializeContext = context;
InstanceName = ContextInstanceManager.TryAdd(context);
}
/// <summary>
/// 尝试创建对应的表。
/// </summary>
/// <param name="service"></param>
/// <param name="entityType">实体类型。</param>
/// <returns></returns>
public static bool TryCreate(IContextService service, Type entityType)
{
var tbGen = service.Provider.GetTableGenerateProvider();
if (service == null)
{
return(false);
}
var metadata = EntityMetadataUnity.GetEntityMetadata(entityType);
var instanceName = ContextInstanceManager.TryAdd(service.InitializeContext);
var cacheKey = string.Concat(instanceName, ":", entityType.FullName);
return(cache.GetOrAdd(cacheKey, () =>
{
//判断数据表是否已存在
if (tbGen.IsExists(service.Database, metadata))
{
try
{
//尝试添加新的字段
var properties = tbGen.TryAddFields(service.Database, metadata);
if (properties.Any())
{
//通知 context 仓储已经以身改变
service.OnRespositoryChanged?.Invoke(new RespositoryChangedEventArgs
{
Succeed = true,
EntityType = entityType,
EventType = RespositoryChangeEventType.AddFields,
AddedProperties = new ReadOnlyCollection <IProperty>(properties)
});
}
}
catch (Exception exp)
{
service.OnRespositoryChanged?.Invoke(new RespositoryChangedEventArgs
{
EntityType = entityType,
EventType = RespositoryChangeEventType.AddFields,
Exception = exp
});
return false;
}
}
else
{
try
{
//尝试创建数据表
if (tbGen.TryCreate(service.Database, metadata))
{
//通知 context 仓储已经创建
service.OnRespositoryChanged?.Invoke(new RespositoryChangedEventArgs
{
Succeed = true,
EntityType = entityType,
EventType = RespositoryChangeEventType.CreateTable
});
}
}
catch (Exception exp)
{
service.OnRespositoryChanged?.Invoke(new RespositoryChangedEventArgs
{
EntityType = entityType,
EventType = RespositoryChangeEventType.CreateTable,
Exception = exp
});
return false;
}
}
return true;
}));
}