你如何比较使用.NET类型在NHibernate的的ICriteria查询的ICompositeUserType？

Question

我对如何结合传统CHAR数据库日期和时间字段到一个.NET DateTime财产在我的POCO的回答StackOverflow的问题 这里（感谢很多 Berryl ！）。现在我想获得一个自定义ICritera查询工作针对非常DateTime财产无济于事。这里是我的查询：

ICriteria criteria =
    Session.CreateCriteria<InputFileLog>()
    .Add(Expression.Gt(MembersOf<InputFileLog>.GetName(x => x.FileCreationDateTime), DateTime.Now.AddDays(-14)))
    .AddOrder(Order.Desc(Projections.Id()))
    .CreateCriteria(typeof(InputFile).Name)
        .Add(Expression.Eq(MembersOf<InputFile>.GetName(x => x.Id), inputFileName));

IList<InputFileLog> list = criteria.List<InputFileLog>();

和这里的查询它的生成：

SELECT this_.input_file_token as input1_9_2_,
    this_.file_creation_date as file2_9_2_,
    this_.file_creation_time as file3_9_2_,
    this_.approval_ind as approval4_9_2_,
    this_.file_id as file5_9_2_,
    this_.process_name as process6_9_2_,
    this_.process_status as process7_9_2_,
    this_.input_file_name as input8_9_2_,
    gonogo3_.input_file_token as input1_6_0_,
    gonogo3_.go_nogo_ind as go2_6_0_,
    inputfile1_.input_file_name as input1_3_1_,
    inputfile1_.src_code as src2_3_1_,
    inputfile1_.process_cat_code as process3_3_1_
FROM input_file_log this_
    left outer join go_nogo gonogo3_ on this_.input_file_token=gonogo3_.input_file_token
    inner join input_file inputfile1_ on this_.input_file_name=inputfile1_.input_file_name
WHERE this_.file_creation_date > :p0 and
    this_.file_creation_time > :p1 and
    inputfile1_.input_file_name = :p2
ORDER BY this_.input_file_token desc;
:p0 = '20100401',
:p1 = '15:15:27',
:p2 = 'LMCONV_JR'

在查询这正是我所期望的，其实，除了它实际上并没有给我什么，我想，因为在DB（所有在过去2周行）它在做什么，而不是CHARs的大于使用比较DATEs 。我不知道怎么去查询到CHAR值转换成DATE查询而不做createSQLQuery（）方法，我想避免。任何人都知道如何做到这一点？

更新： 我一直在寻找到试图用Projections.SqlFunction()或公式来做到这一点，但没有成功为止。以下是我已经使用SqlFunction()的代码，但我得到一个错误NHibernate.QueryException : property does not map to a single column: FileCreationDateTime：

DateTime twoWeeksAgo = DateTime.Now.AddDays(-14);
ICriteria criteria =
    Session.CreateCriteria<InputFileLog>()
    .Add(Restrictions.Gt(Projections.SqlFunction("to_date", NHibernateUtil.DateTime, Projections.Property(MembersOf<InputFileLog>.GetName(x => x.FileCreationDateTime))), twoWeeksAgo))
    //.Add(Expression.Gt(MembersOf<InputFileLog>.GetName(x => x.FileCreationDateTime), DateTime.Now.AddDays(-14)))
    .AddOrder(Order.Desc(Projections.Id()))
     .CreateCriteria(typeof(InputFile).Name)
        .Add(Expression.Eq(MembersOf<InputFile>.GetName(x => x.Id), inputFileName));

我敢肯定，我在这里做得不对，仍然因为FileCreationDateTime使用其将.NET ICompositeUserType属性为两个的Oracle SQL DateTime列（请参阅自定义CHAR它不喜欢它反正这StackOverflow上的question细节）。

Answer 1

我终于弄清楚了这一点！这里的代码（出于某些原因StackOverflow的是使一些在该第一代码的方法的名称的代码段的类型的语法的颜色）：

    IList<InputFileLog> list = null;
    DateTime twoWeeksAgo = DateTime.Now.AddDays(-14);

    IProjection datePropProj =
        DefaultStringFileCreationDateTimeType.GetFileCreationDateToDateSQLProjection();
    IProjection timePropProj =
        DefaultStringFileCreationDateTimeType.GetFileCreationTimeToDateSQLProjection();

    IProjection dateConstProj =
        DefaultStringFileCreationDateTimeType.GetFileCreationDateToDateSQLFunction(twoWeeksAgo);
    IProjection timeConstProj =
        DefaultStringFileCreationDateTimeType.GetFileCreationTimeToDateSQLFunction(twoWeeksAgo);

    ICriteria criteria =
        Session.CreateCriteria<InputFileLog>()
        .Add(Restrictions.Or(Restrictions.GtProperty(datePropProj, dateConstProj),
            Restrictions.And(Restrictions.EqProperty(datePropProj, dateConstProj),
                Restrictions.GeProperty(timePropProj, timeConstProj))))
        .AddOrder(Order.Desc(Projections.Id()))
        .CreateCriteria(typeof(InputFile).Name)
            .Add(Expression.Eq(MembersOf<InputFile>.GetName(x => x.Id), inputFileName));

    list = criteria.List<InputFileLog>();

这就是我用来创建SQLProjections和SQLFunctions方法。我把它们放在我ICompositeUserType（DefaultStringFileCreationDateTime），我用于在FileCreationDateTime属性的定制类型映射。

public class DefaultStringFileCreationDateTime : ICompositeUserType
{
    .
    .
    .
    public const string DotNetDateFormat = "yyyyMMdd";

    public const string DotNetTimeFormat = "HH:mm:ss";

    public const string DbDateFormat = "YYYYMMDD";

    public const string DbTimeFormat = "HH24:MI:SS";

    private const string _nullDateRepresentationInDb = "00000000";

    public struct DatabaseFieldNames
    {
        /// <summary>
        /// File creation date column name.
        /// </summary>
        public const string FileCreationDate = "file_creation_date";

        /// <summary>
        /// File creation time column name.
        /// </summary>
        public const string FileCreationTime = "file_creation_time";
    }

    public static IProjection GetFileCreationDateToDateSQLProjection()
    {
        return ProjectionUtil.GetToDateSQLProjection(DatabaseFieldNames.FileCreationDate, DbDateFormat, NHibernateUtil.DateTime);
    }

    public static IProjection GetFileCreationTimeToDateSQLProjection()
    {
        return ProjectionUtil.GetToDateSQLProjection(DatabaseFieldNames.FileCreationTime, DbTimeFormat, NHibernateUtil.DateTime);
    }

    public static IProjection GetFileCreationDateToDateSQLFunction(DateTime dt)
    {
        return ProjectionUtil.GetToDateSQLFunction(dt, DotNetDateFormat, DbDateFormat);
    }

    public static IProjection GetFileCreationTimeToDateSQLFunction(DateTime dt)
    {
        return ProjectionUtil.GetToDateSQLFunction(dt, DotNetTimeFormat, DbTimeFormat);
    }
}

我已经使用用于consts构件实施DatabaseFieldNames struct PropertyNames，所以我能够重用这些硬编码列名称为我需要以及所述Projections。

在此处，通用Projection方法生活的to_date实用工具类：

public class ProjectionUtil
{
    public static IProjection GetToDateSQLProjection(
        string columnName, string dbToDateFormat, IType returnType)
    {
        return Projections.SqlProjection(
            string.Format("to_date({0}, '{1}') as {0}", columnName, dbToDateFormat),
            new string[] { columnName },
            new IType[] { returnType });
    }

    public static IProjection GetToDateSQLFunction(
        DateTime dt, string dotNetFormatString, string dbFormatString)
    {
        return Projections.SqlFunction(
            "to_date",
            NHibernateUtil.DateTime,
            Projections.Constant(dt.ToString(dotNetFormatString)),
            Projections.Constant(dbFormatString));
    }
}

最后，这里的的Oracle SQL该NHibernate的生成：

SELECT
    this_.input_file_token as input1_9_2_,
    this_.file_creation_date as file2_9_2_,
    this_.file_creation_time as file3_9_2_,
    this_.approval_ind as approval4_9_2_,
    this_.file_id as file5_9_2_,
    this_.process_name as process6_9_2_,
    this_.process_status as process7_9_2_,
    this_.input_file_name as input8_9_2_,
    gonogo3_.input_file_token as input1_6_0_,
    gonogo3_.go_nogo_ind as go2_6_0_,
    inputfile1_.input_file_name as input1_3_1_,
    inputfile1_.src_code as src2_3_1_,
    inputfile1_.process_cat_code as process3_3_1_
FROM
    input_file_log this_
    left outer join go_nogo gonogo3_ on this_.input_file_token=gonogo3_.input_file_token
    inner join input_file inputfile1_ on this_.input_file_name=inputfile1_.input_file_name
WHERE
    (
        to_date(file_creation_date, 'YYYYMMDD') > to_date(:p0, :p1) or 
        (
            to_date(file_creation_date, 'YYYYMMDD') = to_date(:p2, :p3) and
            to_date(file_creation_time, 'HH24:MI:SS') >= to_date(:p4, :p5)
        )
    ) and
    inputfile1_.input_file_name = :p6
ORDER BY this_.input_file_token desc;
:p0 = '20100415',
:p1 = 'YYYYMMDD',
:p2 = '20100415',
:p3 = 'YYYYMMDD',
:p4 = '18:48:48',
:p5 = 'HH24:MI:SS',
:p6 = 'LMCONV_JR'

不能相信我有这个！我想我将不得不采取一定的ISQLQuery！