protected ShardingDbContext(ContextScope scope, DbTransactionContext dbTran) : base(dbTran.Connection)
{
Scope = scope;
UseTransaction(dbTran); //设置Scope后才可调用
CheckTableCreate(dbTran.ConnectionString);
}
/// <summary>
/// 获取或新建实例
/// </summary>
private T GetDb(ContextScope scope)
{
var type = typeof(T);
var typeKey = type.Namespace + type.Name + scope.TablePostfix;
return(GetComponent(() => Create(scope), typeKey));
}
/// <summary>
/// 创建新的Db实例
/// </summary>
private T Create(ContextScope scope)
{
if (scope.ScopeType != _dbConfig.ScopeType)
{
throw new Exception($"{typeof(T).Name} ShardScope is {_dbConfig.ScopeType}, Can't use {scope.ScopeType}!");
}
if (_dbConfig.DbConstructor.NewDb != null)
{
return(_dbConfig.DbConstructor.NewDb(scope));
}
//反射创建
return(Activator.CreateInstance(typeof(T), scope) as T);
}
/*/// <summary>
* /// 创建DbCreater（主要用于子类调用，以确保静态构造函数被调用-RegDb）
* /// </summary>
* protected static ShardingDbCreater<T> Creater<T>(BaseServiceComponent service) where T : ShardingDbContext
* {
* return new ShardingDbCreater<T>(service);
* }*/
#endregion
#region Ctor
//执行顺序Ctor、OnConfiguring、OnModelCreating
protected ShardingDbContext(ContextScope scope, string connectionString) : base(connectionString)
{
Scope = scope;
CheckTableCreate(connectionString);
}
/// <summary>
/// DateTime.Today 在当前ScopeType下的ContextScope。
/// </summary>
public static ContextScope Today(this ShardScopeType scopeType)
{
return(ContextScope.Create(scopeType, DateTime.Today));
}
/// <summary>
/// 按Scope获取ShardingDb
/// </summary>
public T By(ContextScope scope)
{
return(GetDb(scope));
}
/// <summary>
/// 按时间范围创建Scope，范围错误时，可能为空。
/// </summary>
public List <ContextScope> Scope(DateTime start, DateTime end, bool avoidFutureTime = true)
{
return(ContextScope.Create(_dbConfig.ScopeType, start, end, avoidFutureTime));
//if (scopes.IsNullOrEmpty()) scopes = scopes.NullableAdd(Scope(start));
}
/// <summary>
/// 按时间创建Scope
/// </summary>
public ContextScope Scope(DateTime date)
{
return(ContextScope.Create(_dbConfig.ScopeType, date));
}