1

我的模型包含一个具有数字 Landcode 属性的实体。值 0 是此属性的有效值：

<cf:entity name="Land">
  <cf:property name="Id" key="true" />
  <cf:property name="Landcode" typeName="ushort" nullable="false" usePersistenceDefaultValue="false" />

  <cf:method name="LoadByLandcode"
      body="LOADONE(ushort landCode) WHERE Landcode = @landcode">
  </cf:method>
</cf:entity>

LoadByLandcode 方法生成的代码如下所示：

public static Land LoadByLandcode(ushort landCode)
{
    if ((landCode == CodeFluentPersistence.DefaultUInt16Value))
    {
        return null;
    }
    Land land = new Land();
    CodeFluent.Runtime.CodeFluentPersistence persistence = CodeFluentContext.Get(BusinessLayerStoreName).Persistence;
    persistence.CreateStoredProcedureCommand(null, "Land", "LoadByLandcode");
    persistence.AddParameter("@landCode", landCode);
    System.Data.IDataReader reader = null;
    try
    {
        reader = persistence.ExecuteReader();
        if ((reader.Read() == true))
        {
            land.ReadRecord(reader, CodeFluent.Runtime.CodeFluentReloadOptions.Default);
            land.EntityState = CodeFluent.Runtime.CodeFluentEntityState.Unchanged;
            return land;
        }
    }
    finally
    {
        if ((reader != null))
        {
            reader.Dispose();
        }
        persistence.CompleteCommand();
    }
    return null;
}

如您所见，如果提供的 landCode 参数为 0，CodeFluent 将返回 null。为了避免这种检查，我指出 landCode 参数可以为空：

  <cf:method name="LoadByLandcode" body="LOADONE(ushort landCode?) WHERE Landcode = @landcode">
  </cf:method>

或者

<cf:method name="LoadByLandcode" body="LOADONE(ushort landCode) WHERE Landcode = @landcode">
  <cf:parameter name="landCode" nullable="true" />
</cf:method>

现在在 BOM 中已删除对 0 的检查，但在存储过程中添加了对 landCode 参数的 null 检查：

CREATE PROCEDURE [dbo].[Land_LoadByLandcode]
(
  @landCode [smallint] = NULL
)
AS
SET NOCOUNT ON
IF (@landCode IS NULL)
BEGIN
  SELECT DISTINCT [Land].[Land_Id], [Land].[Landcode], ...FROM [Land] 
END
ELSE
BEGIN
  SELECT DISTINCT [Land].[Land_Id], [Land].[Landcode], ... FROM [Land] 
    WHERE ([Land].[Landcode] = @landCode)
END
RETURN

我既不想在 BOM 中检查 0，也不想在存储过程中检查 NULL。我怎样才能做到这一点？

4

1 回答 1

0

要删除生成的 BOM 中的默认值检查，请设置cfom:checkDefaultValue="false".

<cf:method name="LoadByLandcode" body="LOADONE(ushort landCode) WHERE Landcode = @landcode">
   <cf:parameter typeName="ushort" name="landCode" nullable="False" cfom:checkDefaultValue="false" modelNullable="False"  usePersistenceDefaultValue="false" />
</cf:method>

如果使用图形界面：

这会产生：

public static Land LoadByLandcode(ushort landCode)
{
    Land land = new Land();
    CodeFluent.Runtime.CodeFluentPersistence persistence = CodeFluentContext.Get(Constants.StoreName).Persistence;
    persistence.CreateStoredProcedureCommand(null, "Land", "LoadByLandcode");
    persistence.AddRawParameter("@landCode", landCode);
    System.Data.IDataReader reader = null;
    try
    {
        reader = persistence.ExecuteReader();
        if ((reader.Read() == true))
        {
            land.ReadRecord(reader, CodeFluent.Runtime.CodeFluentReloadOptions.Default);
            land.EntityState = CodeFluent.Runtime.CodeFluentEntityState.Unchanged;
            return land;
        }
    }
    finally
    {
        if ((reader != null))
        {
            reader.Dispose();
        }
        persistence.CompleteCommand();
    }
    return null;
}



CREATE PROCEDURE [dbo].[Land_LoadByLandcode]
(
 @landCode [smallint]
)
AS
SET NOCOUNT ON
SELECT DISTINCT [Land].[Land_Id], [Land].[Land_Landcode] 
    FROM [Land]
    WHERE ([Land].[Land_Landcode] = @landCode)

RETURN
GO
于 2016-06-24T09:51:15.323 回答