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  • petapoco IsNew

    Singleton<SqlServer2012DatabaseType>.Instance
    SqlClientFactory.Instance
    SqlServerDatabase

    public Database(string connectionString, DatabaseType databaseType, DbProviderFactory provider, IsolationLevel? isolationLevel = null, bool enableAutoSelect = DefaultEnableAutoSelect)
    {
    EnableAutoSelect = enableAutoSelect;
    KeepConnectionAlive = false;

    _sharedConnection = default!;
    _connectionString = connectionString;
    _factory = provider;
    _dbType = databaseType ?? DatabaseType.Resolve(_factory.GetType().Name, null);
    _providerName = _dbType.GetProviderName();
    _isolationLevel = isolationLevel ?? _dbType.GetDefaultTransactionIsolationLevel();
    _paramPrefix = _dbType.GetParameterPrefix(_connectionString);
    }


    // Check if a poco represents a new record public bool IsNew(string primaryKeyName, object poco) { var pd = PocoData.ForObject(poco, primaryKeyName); object pk; PocoColumn pc; if (pd.Columns.TryGetValue(primaryKeyName, out pc)) { pk = pc.GetValue(poco); } #if !PETAPOCO_NO_DYNAMIC else if (poco.GetType() == typeof(System.Dynamic.ExpandoObject)) { return true; } #endif else if (primaryKeyName.Contains(",")) { return primaryKeyName.Split(',') .Select(pkPart => GetValue(pkPart, poco)) .Any(pkValue => IsDefaultOrNull(pkValue)); } else { pk = GetValue(primaryKeyName, poco); } return IsDefaultOrNull(pk); } private static object GetValue(string primaryKeyName, object poco) { object pk; var pi = poco.GetType().GetProperty(primaryKeyName); if (pi == null) throw new ArgumentException( string.Format("The object doesn't have a property matching the primary key column name '{0}'", primaryKeyName)); pk = pi.GetValue(poco, null); return pk; } private static bool IsDefaultOrNull(object pk) { if (pk == null) return true; var type = pk.GetType(); if (type.IsValueType) { // Common primary key types if (type == typeof(long)) return (long)pk == default(long); else if (type == typeof(ulong)) return (ulong)pk == default(ulong); else if (type == typeof(int)) return (int)pk == default(int); else if (type == typeof(uint)) return (uint)pk == default(uint); else if (type == typeof(Guid)) return (Guid)pk == default(Guid); // Create a default instance and compare return pk == Activator.CreateInstance(pk.GetType()); } else { return pk == null; } }
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  • 原文地址:https://www.cnblogs.com/zwei1121/p/5201678.html
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