我在 .NET 表单中添加了一个新控件，我想将其值保存在表中。我在表中添加了一个新列。如何使用 MyGeneration Doodads 为该表创建数据访问对象？我有看了http://www.mygenerationsoftware.com/portal/doodads/cusage/tabid/53/default.aspx ，但我不明白“模板”是什么意思。为表重新生成doodads的程序是什么？
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你不会得到太多的回应...... dOOdads 多年来一直没有得到支持。无论如何，我们也使用 dOOdads，我只是为我的 WPF 项目推出我自己的存储库（我知道它不是 ASP，但我认为你不能只是“即插即用”）。这是我的基本查找类的示例：
public abstract class BaseLookup<TEntity>
{
// Constructor
protected BaseLookup()
{
this.SubsetIdentifier = null;
}
// Properties
public virtual object SubsetIdentifier { get; set; }
// Public Methods
public abstract IEnumerable<TEntity> Read();
public virtual TEntity ReadSingle()
{
return default(TEntity);
}
// Protected Methods
/// <summary>
/// Retrieve translated entities from the database. The methods used to do this
/// are specified from the child class as parameters (i.e. Action or Func delegates).
/// </summary>
/// <param name="loadSubsetFunc">Specify how to load a set of database records.
/// Return boolean confirmation that records were found.</param>
/// <param name="orderByAction">Specify what should happen to sort the results.</param>
/// <param name="translateRowFunc">Specify how a database record should translate to
/// a model entity. Return the new entity.</param>
/// <param name="moveNextFunc">Specify how the database row pointer should move on.
/// Return FALSE on a call to the final row.</param>
/// <returns>A set of translated entities from the database.</returns>
/// <example><code>
///
/// return base.ReloadRecords(
/// _dOOdad.LoadAll,
/// () =>
/// {
/// _dOOdad.Sort = _dOOdad.GetAutoKeyColumn();
/// },
/// () =>
/// {
/// var entity = new LookupEntity();
/// return entity.PopulateLookupEntity(_dOOdad.CurrentRow.ItemArray);
/// },
/// _dOOdad.MoveNext);
///
/// </code></example>
protected virtual IEnumerable<TEntity> ReloadRecords(Func<bool> loadSubsetFunc,
Action orderByAction, Func<TEntity> translateRowFunc, Func<bool> moveNextFunc)
{
// If records are found, sort them and return set of entities
if (loadSubsetFunc())
{
orderByAction();
do
{
var entity = translateRowFunc();
yield return entity;
}
while (moveNextFunc());
}
else
{
Debug.WriteLine(
string.Format(
"# ZERO records found: Returning empty set of {0}.",
typeof(TEntity).Name));
}
}
}
这是基本查找的具体实现：
public class CyclesLookup : BaseLookup<BaseLookupEntity>
{
// Fields & Constructor
private readonly CYCLES _dOOdad;
public CyclesLookup(IDbConnection connection, string library)
{
_dOOdad = OpenConnection(connection, library);
}
// Base Override Methods
public override IEnumerable<BaseLookupEntity> Read()
{
// Clear old result set and settings
_dOOdad.FlushData();
// Reload the records and return them sorted and translated
return base.ReloadRecords(
_dOOdad.LoadAll,
() =>
{
_dOOdad.Sort = _dOOdad.GetAutoKeyColumn();
},
() =>
{
var entity = new LookupEntity();
entity.Description = string.Format("Cycles for {0}", _dOOdad.YEAR);
return entity.PopulateLookupEntity(_dOOdad.CurrentRow.ItemArray, true);
},
_dOOdad.MoveNext);
}
// Private Helper Methods
private static CYCLES OpenConnection(IDbConnection connection, string library)
{
var dOOdad = new CYCLES(connection);
dOOdad.SchemaGlobal = library + ".";
return dOOdad;
}
}
PopulateLookupEntity 方法只是一个扩展方法：
public static T PopulateLookupEntity<T>(this T entity, object[] rowItems,
bool noDescription = false) where T : BaseLookupEntity
{
int id = 0;
int.TryParse(rowItems[0].ToString(), out id);
entity.RecordID = id;
var attributesFirstIndex = 1;
if (!noDescription)
{
entity.Description = rowItems[1].ToString();
attributesFirstIndex = 2;
}
entity.Attributes = new object[rowItems.Length - attributesFirstIndex];
for (int index = attributesFirstIndex; index < rowItems.Length; index++)
{
entity.Attributes[index - attributesFirstIndex] = rowItems[index];
}
return (T)entity;
}
对于非查找，我有一个从 BaseLookup 继承的更复杂的 BaseRepository 类。有了那个，我不使用 PopulateLookupEntity，而是使用这样的私有辅助方法：
private IPlanningGridHeader TranslateCurrentDoodadRow()
{
return new PlanningGridHeader()
{
PlanNumber = Convert.ToInt32(_dOOdad.PLANNUMBER),
Active = _dOOdad.ACTIVE == 1M,
Capturer = _dOOdad.CAPTURER,
Region = _dOOdad.REGION,
CorporateID = Convert.ToInt32(_dOOdad.CORPORATEID),
StartDate = _dOOdad.STARTDATE.ConvertDb2Date(),
EndDate = _dOOdad.ENDDATE.ConvertDb2Date(),
AdvertStartDate = _dOOdad.ADVERTSTARTDATE.ConvertDb2Date(),
AdvertEndDate = _dOOdad.ADVERTENDDATE.ConvertDb2Date(),
BpcsDealNumber = Convert.ToInt32(_dOOdad.BPCSDEALNUMBER),
Description = _dOOdad.DESCRIPTION,
DeactivationReason = _dOOdad.DEACTIVATIONREASON,
LastSavedUsername = _dOOdad.LASTUSER,
LastSavedDateTime = _dOOdad.LASTDATE.ConvertDb2Date().AddDb2Time(_dOOdad.LASTTIME)
};
}
希望这可以帮助 ：-）
于 2013-11-05T08:09:01.613 回答
1
虽然它很旧，但我建议远离这个图书馆。它有一个导致连接泄漏的严重错误，我敢打赌创建者在编码时没有检查 ADO.NET 实践。而且，他不知道如何处理DBNull，所以他在普通属性的旁边发明了“字符串属性”来处理NULL问题，把生成的代码和编程模型弄得一团糟，开发人员正常访问时产生了更多的NullReferenceException值为 null 的属性。
我使用 MyGeneration Doodads 从一个已有 10 多年历史的遗留系统中收集了所有这些问题。很高兴我终于可以摆脱它了。
如果您正在为企业应用程序寻找 DAC 库，请不要选择此库。
于 2020-02-10T20:10:01.243 回答